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1 Welcome!

2 Industrial Control Panels and Machinery for North America Industrial Control Panels in accordance with the Standard UL508A Electrical Equipment of Machinery in accordance with the Standard NFPA79

3 Speaker SIEMENS Gerhard Flierl Graduate in Electrical Engineering and Business Administration Industrial Automation Industrial Controls Application consulting: - North American Standards and Codes - European Directives and international IEC/ISO standards Page 3 Issue date 04/2014 Industrial Control Panels and Machinery for North America

4 Note / disclaimer The circuit examples and interpretations of the standard contained in this document shall be non-binding and do not claim to be complete in terms of configuration and equipment or to consider any other contingencies. The information provided herein does not represent any customer-specific solutions, but is merely intended to support the reader with typical tasks. Every reader shall be solely responsible for ensuring the proper operation of the products described in this presentation. This presentation shall not exempt the reader from the obligation to exercise due diligence with regard to application, installation, operation and maintenance. By using this presentation, the reader acknowledges that Siemens cannot be held liable for any damage beyond the liability provisions described above. We reserve the right to subject this information document to changes at anytime and without prior notice. Many tables and texts contained in this presentation were directly extracted from the NEC 2011, NFPA79 and UL standards during the document s preparation. Every reader shall be obliged to continuously verify whether the corresponding citations are still valid. The final decision as to whether an application complies with the respective American standards and regulations shall lie with the end customer or an organization respectively authorized by him (e.g.: AHJ = Authority Having Jurisdiction). Page 4 Issue date 04/2014 Industrial Control Panels and Machinery for North America

5 Subject Fields Terms, Definitions, History Power supply systems in North America Branch Circuit Feeder Circuit Infeed and supply, main disconnecting means SCCR Short Circuit Current Rating Motor Branch Circuits acc. UL508A Control Circuits acc. UL508A Enclosure types acc. UL/NEMA Protective measures Grounding requirements Markings for Industrial Control Panels How to use unlisted components Protection of Appliance Loads Summary, False Friends and Frequent Mistakes Pictures Page 5 Issue date 04/2014 Industrial Control Panels and Machinery for North America

6 Now you certainly have questions... Page 6 Issue date 04/2014 Industrial Control Panels and Machinery for North America

7 Thank you for your attention! Gerhard Flierl Siemens Industry Inc. Industrial Automation 5300 Triangle Parkway Norcross 30092, Atlanta / GA Phone: +1 (770) Cell Phone: +1 (404) gerhard.flierl@siemens.com

8 Definiton of Terms, Explanations, History Organizations Standards and Codes Markings

9 Meaning of Standards General function of standards: Standards do not represent laws their application is voluntary, strictly speaking; however, they have a quasi-legislative character due to their high acceptance Standards reflect the rules of technology / state-of-the-art technology Standards have a supporting function for the attainment of technical minimum levels Compliance with standards is not sufficient but is a minimum requirement Main protection targets of standards: safety of persons, livestock and objects Page 2 Issue date 04/2014 Industrial Control Panels and Machinery for North America

10 IEC and UL Markets at a Glance IEC UL / NFPA / NEMA IEC / UL / NFPA CSA / UL Page 3 Issue date 04/2014 Industrial Control Panels and Machinery for North America

11 Differences Between Europe & North America Europe Responsibility of the manufacturer Responsibility of the operator Protection targets are defined by directives Presumption of conformity with the application of harmonized standards (ISO9000 et seqq., self-certification, self-responsibility) USA / North America Responsibility of the operator Protection targets and requirements are defined by laws Certification / listing of products Verification by independent NRTL/AHJ (third-party certification) + Granting of operating license by inspector / AHJ Page 4 Issue date 04/2014 Industrial Control Panels and Machinery for North America

12 Extracts of the OSHA standards and NEC Ed OSHA (b)(2) Subpart S Electrical / General requirements: Installation and use: Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling. Definitions acc. NEC Art. 100: Equipment: A general term, including fittings, devices, appliances, luminaires, apparatus, machinery, and the like used as a part of, or in connection with, an electrical installation. Listed: Equipment, materials, or services included in a list published by an organization that is acceptable to the authority having jurisdiction and concerned with evaluation of products or services, that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services, and whose listing states that either the equipment, material, or service meets appropriate designated standards or has been tested and found suitable for a specified purpose. Labeled: Equipment or materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains periodic inspection of production of labeled equipment or materials, and by whose labeling the manufacturer indicates compliance with appropriate standards etc. Page 5 Issue date 04/2014 Industrial Control Panels and Machinery for North America

13 NRTLs According to OSHA Excerpt from Page 7 Issue date 04/2014 Industrial Control Panels and Machinery for North America

14 Definition of Terms AHJ Authorities Having Jurisdiction (AHJ s): Compliance with laws and codes is monitored by the responsible authorities of the respective federal states, districts or municipalities Example: State Electrical Commission, State Fire Marshal The current NEC (National Electrical Code) serves as reference in most cases Page 8 Issue date 04/2014 Industrial Control Panels and Machinery for North America

15 Extracts from the "Electrical Inspection Manual" Approved: Acceptable to the authority having jurisdiction. [Approval is a primary responsibility of an electrical inspector. Investigations by a thirdparty and the listing and labeling that result are a great aid to inspectors in this responsibility (see "Labeled and"listed").] The inspector decides on what is and what is not accepted; UL approvals serve as a great help and reference for the inspector AHJ function: The key to a successful and correct electrical inspection lies in applying the rules of the Code, not the personal preferences of the inspector. To reiterate, if the installation meets the Code requirements (including any local amendments) and is safe, the installation should pass inspection. The application of standards facilitates acceptance by the inspector Page 9 Issue date 04/2014 Industrial Control Panels and Machinery for North America

16 Important Standards for OEMs and Industrial Control Panel Manufacturers National Electrical Code or NFPA70 UL508A Industrial Control Panels NFPA79 Industrial Machinery NEC is the only statutory standard in the USA UL508A and NFPA79 have a quasi-legislative character Page 10 Issue date 04/2014 Industrial Control Panels and Machinery for North America

17 UL 508A New version The new Version of UL 508A was published in December 2013 Page 11 Issue date 04/2014 Industrial Control Panels and Machinery for North America

18 Organizations The origin of UL 1893 World Exhibition in Chicago Outbreak of a fire 1894 Start of UL William H. Merrill opens the Underwriters Electrical Bureau Page 13 Issue date 04/2014 Industrial Control Panels and Machinery for North America

19 NFPA Organization Foundation: 1896, due to increasing sprinkler system installations Headquarters: Quincy, Massachusetts Publication of over 300 standards to date National Electrical Code or NFPA70 NFPA79 Electrical Standard for Industrial Machinery Standardization organization in the field of fire protection, electrical safety and building safety Page 14 Issue date 04/2014 Industrial Control Panels and Machinery for North America

20 National Electrical Code (NEC) 2014 Maximum voltage of an Industrial Control Panels has been changed from 600V to 1000V Page 15 Issue date 04/2014 Industrial Control Panels and Machinery for North America

21 National Electrical Code (NEC) 2014 Maximum voltage of an Industrial Control Panels has been changed When it comes to Industrial control panels the NEC 2014 refers still to UL 508A! Recommendation: Industrial control Panels should fulfill furthermore the UL 508A Maximum voltage 600V! UL 508A is still limited to 600V or less! Page 16 Issue date 04/2014 Industrial Control Panels and Machinery for North America

22 UL 508A Important changes UL 508A was extended by the following specific use parts: Fountain control panels Industrial control panels for irrigation equipment Enclosures Industrial machinery Crane control Service Equipment Use Flame Control Marine Use Air Conditioning and Refrigeration Equipment New!!! Page 17 Issue date 04/2014 Industrial Control Panels and Machinery for North America

23 Standards Definition Industrial Control Panels in acc. with NEC 2014 Definition: Components suitable for an Industrial Control Panel UL508A, Table SA1.1 2 or more devices installed in the power circuit including their control circuits and control devices e.g. motor starter Page 18 Issue date 04/2014 Industrial Control Panels and Machinery for North America

24 Application of the wrong standard Example: Scope of the UL508A includes the following - Industrial Control Panels - Flame Control Panels - Industrial Machinery - Crane Control - Air Conditioning and Refrigerating Equipment - Service Equipment - Industrial Control Panel Enclosures does not include the following - Panels for Construction Sites - Motor Control Center - Panels for Classified Locations - Switchgear (UL891) - Control Panels for Wind Mills or photovoltaic - Control Panels for Swimming Pools - Alarmpanels - Fire Pump Stations Page 19 Issue date 04/2014 Industrial Control Panels and Machinery for North America

25 Meaning of the NPFA Edition Scope of the standard: application standard for electrical equipment and systems with max. 600 V for operator and system protection from the electric infeed down to the individual machine modules for non-hazardous ambient conditions (non-hazardous locations) Page 20 Issue date 04/2014 Industrial Control Panels and Machinery for North America

26 Industrial Machinery Definition of "industrial machinery" according to NFPA79 & NEC70: Motorized machine(s) for material processing (e.g. forming, pressing, cutting) Not transportable by hand during operation With corresponding modules, as the case may be (e.g. conveyor belts, mounting accessories, testing equipment, packing units) Including control technology with PLC controls, actuators / sensors Definition of "industrial machinery" according to UL508A 65: Metal-processing machines Plastic-processing machines Wood-processing machines Mounting machines Material-handling machines Maintenance and testing equipment Page 21 Issue date 04/2014 Industrial Control Panels and Machinery for North America

27 Examples of Industrial Machines Covered by NFPA79 Annex C Page 22 Issue date 04/2014 Industrial Control Panels and Machinery for North America

28 Example of the scope of application standards NEC (NFPA70) *) NFPA79 *) UL508A *) *) *) *) Page 23 Issue date 04/2014 Industrial Control Panels and Machinery for North America

29 Standards Comparison USA and IEC The comparison shown here was prepared on the basis of the respective standard's application areas; it does not allow for any conclusions regarding the comparability of the standards' contents and rules IEC IEC Page 24 Issue date 04/2014 Industrial Control Panels and Machinery for North America

30 Standard References in the USA NEC (NFPA 70) 2014 Art Scope Safety Standard for Industrial Control Panels Art. 670 Electrical Standard for Industrial Machinery UL508A (Industrial Control Panels) Chapt.65.1 These requirements cover industrial control panel for industrial machinery. NFPA 79 (Electrical Standard for Industrial Machinery) Page 25 Issue date 04/2014 Industrial Control Panels and Machinery for North America

31 Definition of Terms Listings / Symbols Example for a recognized transformer Application of these products requires the so-called CoAs (Conditions of Acceptability) The installer requires "special" instructions = engineering supervision UL certificates (CoC s) include the Conditions of Accesptability or Page 26 Issue date 04/2014 Industrial Control Panels and Machinery for North America

32 Definition of Terms Listings / Symbols UL listed Mark for USA and Canada UL classified Mark for USA and Canada UL enhanced Mark for USA and Canada Notes: - Long transition time (approx. 10 years) - The current classified and listed marks will not expire Page 27 Issue date 04/2014 Industrial Control Panels and Machinery for North America

33 Definition of Terms UL Product Categories The CCN represents a clear description of the respective product The respective CCN Guide Information clearly describes how and under which conditions the respective product can or may be applied ( Every AHJ or UL inspector can thus verify whether the respective product was correctly configured and applied The CCN should be additionally integrated in the parts list Examples: DIVQ // DIVQ7 // NMTR2 // NMTR8 Siemens standards and approval manual Page 29 Issue date 04/2014 Industrial Control Panels and Machinery for North America

34 SA1 list UL508A Page 30 Issue date 04/2014 Industrial Control Panels and Machinery for North America

35 Definition of Terms Factory wiring = internal wiring = all components inside the industrial control panel the installer works under "engineering" supervision UL508A, 29 Field wiring = all components inserted from the outside the installer implements his own professional know-how UL508A, 28 Overcurrent = NEC Art. 100 overload and/or short circuit current and/or, where applicable, ground fault current Excerpt from NFPA 79 Mandatory! Recommendation! UL terms cannot be converted one to one to IEC standards, they must be questioned! Page 31 Issue date 04/2014 Industrial Control Panels and Machinery for North America

36 Factory / Field Wiring Example Excerpt from UL Database ( Power distribution block 5ST25.. CCN: XCFR2 E-file: E80027 Code 1: Only factory wiring Code 2: Factory and field wiring UL-listed products always feature a field wiring approval! Page 32 Issue date 04/2014 Industrial Control Panels and Machinery for North America

37 Agreements Between Manufacturer and Customer Operating Conditions Excerpt Chapter 4 NFPA Type of power supply system grounding: Slash or Straight voltage rating; Voltage interruptions: Voltage interruptions or voltages of zero volt must not exceed 3 milliseconds at any given time within a supply period; a period of more than 1 second must lie between two consecutive voltage interruptions Voltage drops: Voltage drops must not exceed 20% of the supply s peak voltage for more than one period; a period of more than 1 second must lie between two consecutive voltage drops Short-circuit current rating: The short-circuit current rating of the machine / industrial control panel must be equal to or better than the prospective short-circuit current on the connection point; SCCR short circuit current rating (UL508A applicable standard for industrial control panels, Annex SB) Page 35 Issue date 04/2014 Industrial Control Panels and Machinery for North America

38 Agreements Between Manufacturer and Customer The standard offers support in the form of a ready-made questionnaire in Annex B / NFPA79 (only informative!) Page 36 Issue date 04/2014 Industrial Control Panels and Machinery for North America

39 Thank Questions? you for your attention! Note / disclaimer The circuit examples and interpretations of the standard contained in this document shall be non-binding and do not claim to be complete in terms of configuration and equipment or to consider any other contingencies. The information provided herein does not represent any customer-specific solutions, but is merely intended to support the reader with typical tasks. Every reader shall be solely responsible for ensuring the proper operation of the products described in this presentation. This presentation shall not exempt the reader from the obligation to exercise due diligence with regard to application, installation, operation and maintenance. By using this presentation, the reader acknowledges that Siemens cannot be held liable for any damage beyond the liability provisions described above. We reserve the right to subject this information document to changes at anytime and without prior notice. Many tables and texts contained in this presentation were directly extracted from the NEC 2008, NFPA79 and UL standards during the document s preparation. Every reader shall be obliged to continuously verify whether the corresponding citations are still valid. The final decision as to whether an application complies with the respective American standards and regulations shall lie with the end customer or an organization respectively authorized by him (e.g.: AHJ = Authority Having Jurisdiction).

40 Power supply sytems in North America / USA UL guidelines, chapter Overview and specialties Most Common power supply systems in detail Rare power supply systems in detail

41 Overview and requirements There are different type of power supply networks in North America in regards to their - design (e.g. wye, delta) - grounding (ungrounded, grounded, high impedance grounded) Generally, all voltages occurring in these network types are indicated (phase to phase / phase to ground) Also the ground connection and the circuit on the secondary side of the transformer are indicated Abbreviations and Indictaions of number of wires: Number of phase wires: phase, p, or Total number of wires: wire or w Example of voltage ratings: slash rating: 480Y/277V; 3 4w straight rating: 480V; 3p; 3w Page 2 Issue 04/2014 Industrial Control Panels and Machinery for North America

42 Overview and requirements UL508A requires: 1.) For an industrial control panel with a slash voltage rating, the input terminals shall be marked: For use on a solidly grounded wye source only 2.) The voltage rating of an industrial control panel shall not exceed the voltage rating of any component connected to the source of supply. When an industrial control panel contains components marked with a slash voltage rating, such as 120/240, 480Y/277, or 600Y/347, the voltage rating of the industrial control panel shall be: a) The complete slash voltage rating, when intended for connection to the higher voltage; or b) Not more than the lower voltage rating Page 3 Issue 04/2014 Industrial Control Panels and Machinery for North America

43 Overview and requirements NFPA79 requires: A circuit breaker, self-protected combination motor, controller, or a manual motor controller marked with a slash rating, such as 120/240V or 480Y/277V, shall be applied in a solidly grounded circuit where: - the nominal voltage of any conductor to ground does not exceed the lower voltage rating - and the nominal voltage between any two conductors does not exceed the higher voltage rating. When slash-rated devices are connected to the supply circuit of the machine, the nameplate voltage rating shall not exceed the lower voltage rating or shall include the complete slash rating. Page 4 Issue 04/2014 Industrial Control Panels and Machinery for North America

44 Most Important Network Types in Detail Grounded wye / solidly grounded wye Slash rating: e.g.: 480Y/277V, solidly grounded wye 3 phase; 4 wire 3 phase; 3 wire Possible devices 480Y/277V; 600/347V 480V; 600V Transformer 3p, 4w / grounded phase-ground U = 277 V across one contact worst case! I k 480Y/277V AC L1 L2 L3 Note: All devices having a slash rating with the indicated voltage or higher All devices having a straight rating with at least the higher of both voltages M Page 5 Issue 04/2014 Industrial Control Panels and Machinery for North America

45 Most Important Network Types in Detail Corner grounded delta Straight (Delta) rating: e.g.: 480V / 3 phase - 3 wire Transformer 480V AC L1 L2 L3 Possible devices in this example: 480V; 600V I k Phase - Ground Do not use: 480Y/277V; 600Y/347V U = 480 V across one contact worst case!! Note: The devices switch full (=high) voltage at the first single pole short-circuit (phase to ground) M The following applies to this network in principle: Only devices with straight rating must be used! Page 6 Issue 04/2014 Industrial Control Panels and Machinery for North America

46 Most Important Network Types in Detail Ungrounded delta - Ungrounded wye Straight rating: e.g.: 480V / 3 phase - 3 wire Possible devices in this example: 480V; 600V Transformer Δ/Y Phase - Phase I k 480V AC L1 L2 L3! Operation Betrieb requires Insulation monitoring! Do not use: 480Y/277V; 600Y/347V Note: U = 480 V across one contact worst case!! The devices switch the full (=high) voltage at the second single-pole short-circuit (phase to ground) M Insulation measuring The following applies to this network in principle: Only devices with straight rating must be used! Page 7 Issue 04/2014 Industrial Control Panels and Machinery for North America

47 Thank Questions? you for your attention! Note / Disclaimer The circuit examples and interpretations of the standard are non-binding and do not claim completeness concerning configuration, equipping and contingencies. They do not represent customized solutions but merely provide support for typical tasks. Every user of this presentation assumes full responsibility for the proper operation of the described products. This presentation does not relieve you of your obligation to ensure safe application, installation, operation and maintenance. By using this presentation you agree that Siemens cannot be held liable for damage beyond the above-described liability provisions. We reserve the right to modify this document at any time without prior announcement. Many tables and texts in this description were directly taken from NEC 2011 and the UL standards. Every user has to regularly check whether the quoted references are still up-to-date. The final decision as to whether an application complies with the corresponding American standards and regulations lies with the end customer or any organization respectively authorized by him (e.g. authority having jurisdiction, AHJ).

48 Branch Circuit Feeder Circuit UL guidelines, chapter 4.6 Overview and Definition Perspective in an Electrical System Example Siemens Industry Inc All Rights Reserved.

49 Overview and Definition Definitions acc. UL508A: Feeder circuit: Definition: The conductors and circuitry on the supply side of the branch circuit overcurrent protective device. FCPD s: UL489 (3WL; 3VL; 3RV17/18; 5SJ4 -.HG) UL (3NW; Class CC) UL98 Branch circuit: Definition: BRANCH CIRCUIT The conductors and components following the last overcurrent protective device protecting a load. BCPD s: Depending on application case Page 2 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

50 Overview and Definition -DISC -FU1 -FU2 -T -CON1 -OL1 -FU3 -CON2 -OL2 -M1 -M2 Control Circuit Boundary Feeder and Branch Viewing Direction Page 3 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

51 Overview and Definition Practical realization Distance through air and over surface Depending on voltage up to 1 inch distance through air 2 inches distance over surface UL 489 UL 98 UL 248 Circuit Breaker Distribution Feeder Circuit Feeder circuits: see UL 508A table V V V Indication of the distances between the current-carrying wires and enclosure and the distances through air and over surface Branch circuits: see UL 508A table V V V V or Line Terminals Load Terminals Branch Circuit Indication of the distances between current-carrying wires and enclosures and the distances through air and over surface Motors Transformer Heater Page 4 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

52 NEC Ed Important changes Spacings for Industrial Control Panels Spacings Spacings in feeder circuits between uninsulated live parts of adjacent components, between uninsulated live parts of components and grounded or accessible non current-carrying metal parts, between uninsulated live parts of components and the enclosure, and at field wiring terminals shall be as shown in Table (D). Exception: Spacings shall be permitted to be less than those specified in Table (D) at circuit breakers and switches and in listed components installed in industrial control panels. Page 5 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

53 NEC Ed Spacings in branch circuits and control circuits acc. UL508A Page 6 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

54 NEC Ed Spacings in feeder circuits acc. UL508A Page 7 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

55 Thank Questions? you for your attention! Note / Disclaimer The circuit examples and interpretations of the standard are non-binding and do not claim completeness concerning configuration, equipping and contingencies. They do not represent customized solutions but merely provide support for typical tasks. Every user of this presentation assumes full responsibility for the proper operation of the described products. This presentation does not relieve you of your obligation to ensure safe application, installation, operation and maintenance. By using this presentation you agree that Siemens cannot be held liable for damage beyond the above-described liability provisions. We reserve the right to modify this document at any time without prior announcement. Many tables and texts in this description were directly taken from NEC 2011 and the UL standards. Every user has to regularly check whether the quoted references are still up-to-date. The final decision as to whether an application complies with the corresponding American standards and regulations lies with the end customer or any organization respectively authorized by him (e.g. authority having jurisdiction, AHJ). Siemens Industry Inc All Rights Reserved.

56 Infeed Line, Terminals and UL guidelines, Chapter 6.1 Devices for the Disconnection and Isolation of Electric Energy Main Disconnecting Means Interlocking of Main Disconnecting Means Infeed Systems Power Distribution Blocks Busbar Systems

57 Power Supply / Power Supply Systems Overview Grounding for field wiring supply Main power distribution Power supply circuit breaker main disconnecting means (Direct connection of supply cable) Door interlocking locking of the main disconnecting means (defeatable) Circuit Breaker for feeding of the motor branch circuits Motor branch circuits mounted onto 8US busbar Motor branch circuits mounted onto 3RV29 infeed system Page 2 Issue 04/2014 Industrial Control Panels and Machinery for North America

58 Connection of the Infeed Line General: One infeed line should be generally used Further supply points (e.g. for electronics, magn. coupling) should be tapped off within the machine (e.g. transformers, converters) The infeed line should be directly connected to the main disconnecting means Connection to upstream terminals only for special circuits (lighting, maintenance, etc.) or further infeed lines Terminals for more than one conductor must be marked (Attention: field wiring!) N-conductors must be marked and connected to a separate terminal Input terminals must be marked in a readable manner and must correspond to the documentation Page 3 Issue 04/2014 Industrial Control Panels and Machinery for North America

59 Disconnection of the Infeed Line (Main Disconnecting Means) Excluded Circuits Caution: Disconnection of the infeed line generally must effect the disconnection of all circuits, including all control circuits Exceptions: The following circuits need not be disconnected together with the main disconnecting means: Lighting circuits for maintenance works Connectors and receptacles for exclusive connection of maintenance tools and equipment (e.g. hand drill, test equipment) Undervoltage protection for automatic disconnection in case of supply faults Operational processes (e.g. measuring devices for temperature control, memory elements, running heaters) Page 7 Issue 04/2014 Industrial Control Panels and Machinery for North America

60 Disconnection of the Infeed Line (Main Disconnecting Means) Excluded Circuits Assembly of excluded circuits: (1) Separate main disconnecting means, isolation transformer, overcurrent protection Installation in separate enclosure or in the actual industrial control panel close to the actual main disconnecting means (2) Wires on the input side must be routed separately within the enclosure; with wire lengths 460 mm (18 in.), an (additional) cable duct must be used Note: The circuit for the doors' interlocking circuit must be disconnectable in the respective industrial control panel via which it is supplied Page 8 Issue 04/2014 Industrial Control Panels and Machinery for North America

61 Disconnection of the Infeed Line (Main Disconnecting Means) Caution: With the exception of connectors and receptacles, main disconnecting means must always be mounted inside or adjacent to the industrial control panel Exception: Main disconnecting means outside the industrial control panel for machines with max. 2 hp may be mounted in a distance of up to max. 6 m (20 ft) or in sight of, irrespective of interlocking with the industrial control panel Page 10 Issue 04/2014 Industrial Control Panels and Machinery for North America

62 Disconnection of the Infeed Line (Main Disconnecting Means) The following devices may be used as main disconnecting means: Switch disconnectors with HP rating (UL98) Circuit breakers (UL489) Molded-case circuit breakers (UL489) Circuit breakers (UL489) with adjustable short-circuit release (instantaneous trip circuit breaker) as part of a tested assembly "Molded case switch" disconnectors (UL489) "Type E" motor starters (UL508) when only 1 motor is controlled Plug connection for cord connections Page 11 Issue 04/2014 Industrial Control Panels and Machinery for North America

63 Main Disconnecting Means Portfolio 70 A 3RV27 /28 acc. to UL489 5SJ HG4 "MCBs" acc. to UL489 3RV20 acc. to UL508 type E 3RA6 compact starters acc. to UL508 "type E Type E motor starter protector only with max. 1 motor per panel! Page 12 Issue 04/2014 Industrial Control Panels and Machinery for North America

64 Main Disconnecting Means Portfolio 70 A 3VL acc. to UL489 20A.1600A 3WL5 acc. to UL A.5000A Page 13 Issue 04/2014 Industrial Control Panels and Machinery for North America

65 Disconnection of the Infeed Line (Main Disconnecting Means) Requirements for Industrial Control Equipment (1) Disconnection of the supply and "ON-OFF" position; circuit breakers and type E starters may feature a "tripped" position (2) External operating handle Exception: Power-driven industrial control equipment (e.g. with motorized drive) (3) Lockable only in the "OFF" position, independent of the door position (4) Simultaneous switching of all ungrounded supply wires (5) Operability by qualified persons, independent of the door position and without auxiliary means (6) Dimensioning a) Rated current at least 115% of the total FLC (simultaneity!) b) HP rating dimensioning according to NEC Table (B) for LRC / for FLC: LRC/FLC of the main disconnecting means c) Rated voltage supply voltage of the infeed (7) The "ON" and "OFF" positions must be clearly marked LRC of all motors which can be simultaneously started FLC of remaining motors and loads Page 14 Issue 04/2014 Industrial Control Panels and Machinery for North America

66 Protection Against Direct Contact Interlocking of Enclosures General: Main disconnecting means of enclosures / industrial control panels must be interlocked with the door when energized parts are contained with - AC 50 V - DC 60 V Exceptions: 1. Main disconnecting means for industrial control panel lighting inside the industrial control panel 2. Main disconnecting means for memory elements for the retention of information Note: Qualified persons may implement measures for defeating the interlocking (see NFPA 70E "Standard for Electrical Safety in Workplaces") Page 15 Issue 04/2014 Industrial Control Panels and Machinery for North America

67 Infeed Systems Example Main disconnecting means e.g.:in = 250A Power supply system SIRIUS 3RV29 alternatively Busbar system (Siemens 8US system) Power distribution blocks Page 22 Issue 04/2014 Industrial Control Panels and Machinery for North America

68 Load Feeder on Busbar Infeed systems - SIRIUS 3RV2917 infeed system SIRIUS infeed system - technology Up to 63A for S00/S0 IEC: up to 500V UL: up to 600V Motor branch circuit up to 25A (without derating) UL/CSA Approval as self protected combination motor controller according UL 508 Type E IEC: short-circuit capacity, tested assembly up to a breaking capacity of 150kA (400V) UL: 65 ka at 480V System Modules with 2 or 3 load feeders in 45 mm grid Easy, fault-free installation, plug&play Easy disassembling, applicable as visible isolation gap Page 23 Issue 04/2014 Industrial Control Panels and Machinery for North America

69 Busbars (Unlisted and un-recognized) Own-made System UL508A treats busbar systems consisting of copper or aluminum busbars and retainers as standard busbar systems due to a missing UL report see SB4.1 This results in: Max. current load = 1000 A per sqinch = 1000 A for 654 mm 2 = 1,55 A per 1 mm 2 Short-circuit strength SCCR = 10kA Page 24 Issue 04/2014 Industrial Control Panels and Machinery for North America

70 Busbar System Infeed systems 8US busbar system 8US system tested and listed system acc. to UL technical values specified in the UL report are applicable Up to approx. 600A / 600V 40 mm busbar distance for branch circuits 60 mm busbar distance for feeder and branch area Adapter for 3VL are short-circuit proof up to 100kA (depending on installation) IEC and UL/CSA IEC: short-circuit proof, tested assembly up to 153kA (400V), up to 690V SCCR in acc. with UL up to 100kA (480V) depending on devices busbar testing and distance between supports Required considerations of BCPD for: infeed area (feeder) motor branch circuit (branch) Page 25 Issue 04/2014 Industrial Control Panels and Machinery for North America

71 Busbar Systems Infeed systems - SIRIUS 3-phase busbars SIRIUS 3-phase busbars Up to approx. 63A for S00/S0 and up to 108A only for S2 Up to 690V IEC and UL/CSA Short-circuit proof, tested assembly, same as breaking capacity of the circuit breaker System Applied with machines for infeed with motor branch circuits For 2-, 3-, 4- and 5 Circuit Breakers Infeed with 3-phase busbars 3RV19.5 For this purpose, the below-listed 3-phase feeder terminal has to be used. This terminal complies with the distances through air and over surfaces required in acc. with UL508 for types E / F 3-phase feeder terminal 3RV E (S2) 3RV EB (S00/S0) Page 26 Issue 04/2014 Industrial Control Panels and Machinery for North America

72 Power Distribution Blocks Page 27 Issue 04/2014 Industrial Control Panels and Machinery for North America

73 Tap conductor without short circuit protection acc. NFPA79 Case 1: Overcurrent protection at the supply shall not be required if all of the following conditions are met: - The current-carrying capacity of each of the conductors is at least equal to that required for their respective load - Each connecting conductor to the overcurrent protective devices is no longer than 3 m (10 ft). - The conductor is suitably protected from physical damage (e.g. conduit) - The conductor does not extend beyond the control panel enclosure. - The conductor terminates in a single branch circuit rated protective device. Note: Applicable within the control panel enclosure only! Page 28 Issue 04/2014 Industrial Control Panels and Machinery for North America

74 Tap conductor without short circuit protection acc. NFPA79 Case 2: Overcurrent protection at the supply shall not be required if all of the following conditions are met: - The conductor has an ampacity of at least one-third that of the conductor from which it is supplied. - The conductor is suitably protected from physical damage. (e.g. conduit or duct) - The conductor is not over 7.5 m (25 ft) long, and the conductor terminates in a single branch circuit rated protective device Note: Applicable also beyond the control panel enclosure! Page 29 Issue 04/2014 Industrial Control Panels and Machinery for North America

75 Thank Questions? you for your attention! Note / Disclaimer The circuit examples and interpretations of the standard are non-binding and do not claim completeness concerning configuration, equipping and contingencies. They do not represent customized solutions but merely provide support for typical tasks. Every user of this presentation assumes full responsibility for the proper operation of the described products. This presentation does not relieve you of your obligation to ensure safe application, installation, operation and maintenance. By using this presentation you agree that Siemens cannot be held liable for damage beyond the above-described liability provisions. We reserve the right to modify this document at any time without prior announcement. Many tables and texts in this description were directly taken from NEC 2011 and the UL standards. Every user has to regularly check whether the quoted references are still up-to-date. The final decision as to whether an application complies with the corresponding American standards and regulations lies with the end customer or any organization respectively authorized by him (e.g. authority having jurisdiction, AHJ).

76 SCCR Short Circuit Current Rating UL guidelines, chapter 5.8 Definition / Explanations Procedure for Establishing the SCCR Possibilities of Increasing the SCCR Establishment of SCCRs Examples Device Data / UL-Reports Siemens Industry Inc All Rights Reserved.

77 Definition / Explanations Requirement of NEC 2005 Art. 409 (mandatory since April 26, 2006) Re-enforcement of the standards for industrial control panels Failures in determining the short-circuit current rating (= SCCR) of an industrial control panel. For the short-circuit current rating not only the short-circuit breaking capacity of, e.g. the circuit breaker is needed, also the short-circuit current rating of every individual device is as relevant. SCCR-relevant components in the main circuit, such as: Circuit-breakers, contactors, soft starters, overload relays, but also Terminals, busbars, Supply to an control transformers, Frequency converters, Further current limiting effects are not allowed to be considered e.g.: that of wires, cables, busbars, Page 2 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

78 UL 508A Important changes Enclosure Air conditioners are not part of short circuit current (SCCR) calculation when cord-and-attachment plug connected or supplied from a branch circuit protected maximum 60A Page 3 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

79 Definition / Explanation What is this value for? The indication of the SCCR value at the industrial control panel is to ensure that this control panel is only connected to power supply where at the point of connection the available max. short-circuit current will not exceed the given value on the nameplate. The target is fire and personal protection Who specifies this value? This can only be established as part of the agreement between the final user (contractor) and the supplier (OEM). Who determines the short-circuit current of the main power supply at the final user? Customer himself Fault Studies to be carried out by accredited institutes Licensed professional engineers What should this value be? To be agreed between the customer and the contractor Note: The higher the value, the more expensive the devices (compare devices with 35kA and devices with 100kA) Page 4 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

80 Procedure for Establishing the SCCR Determination of the short-circuit current rating (SCCR) acc. to NEC (4): Step 1: Has to be! SCCR of the installed and UL-listed components Step 2: Has to be! Establishment of the SCCR on the basis of standard values (UL508A suppl. SB or UL-guide; chapter 5.8.4). Step 3: Optional, very helpfull! SCCR of tested industrial control equipment assemblies (series rating = 2 circuit breakers in series or combination tests = motor branch circuits) Step 4: Optional, not very helpfull! Use of current limiting devices (transformers, fuses, circuit breakers) Page 5 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

81 Procedure for Establishing the SCCR Step 1 List the short circuit current ratings of components, marked on components or on instructions provided with the components. Excerpt of a method description from the White Paper by Siemens Energy & Automation (SE&A) Establishment of the SCCR value on the basis of the parameters of installed and UL-listed components Page 6 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

82 Procedure for Establishing the SCCR Step 2 List the short circuit current ratings of components, from UL 508A, Table SB 4.1, if no values on the nameplate or on instructions provided with the components (see step 1) Establishment of the SCCR value using the table in UL508A. These standard values must be used if the technical documents do not provide SCCR values for the applied devices. Page 7 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

83 Procedure for Establishing the SCCR Step 3 SCCR of tested industrial control equipment assemblies Series rating tests Series connection of 2 or more devices, which are able to automatically respond in short circuit cases without delay. SB4.3.2 in UL508A! Current limiting cannot be used here! Combination tests Series connection of any type of devices, e.g.: Motor protection circuit breaker and contactor (=fuseless load feeders as type F acc. to UL508) MCCB and terminal block Page 8 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

84 Procedure for Establishing the SCCR Step 3 Series rating Tested combinations Fuse MCCB 3VL MCCB 3VL MCB 5SJ4..HG4 MCB 5SJ4..HG4 M 3RT contactor 3RB motor protection relay Page 9 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

85 Possibilities of Increasing the SCCR Step 4 Use of current limiting fuses, when used as feeder elements SB Only fuses listed in UL508A table SB 4.2 are applicable. Use let-through values from the UL508A table SB 4.2 ONLY (manufacturer s values are NOT permissible) Fuses are also standardized in the geometrical dimensions manufacturer-independent replacement The fuse is replaced by the service staff, which is shall not compare the corresponding let-through values (old fuse versus new fuse) Note: For practical application only partially useable, as, e.g.: Standard contactor up to 37kW: max. 5kA Standard busbar: max. 10kA Standard terminal block: max. 10kA Page 10 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

86 Possibilities to Increase the SCCR Step 4 Attention: Here, only the let-through values of UL508A (table SB4.2, SB4.3.3) have to be used. Let- Through values are peak values. These HAVE TO BE compared with the rms (effective values) of the devices acc. to UL508A. Page 11 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

87 Possibilities of Increasing the SCCR Step 4 Use of current limiting circuit breakers, listed as current limiting, when applied as feeder element SB The circuit breaker must be listed as current limiting The circuit breaker must be marked as current limiting (UL508A SB 4.3.2) The manufacturer has to publish the current limiting characteristics or data and provide them to the user When replacing the circuit breaker by a different type or manufacturer, the SCCR value must be checked again engineering is required Siemens current limiting breakers Note: For practical applications hardly usable, as, e.g.: Standard contactor up to 37kW: max. 5kA Standard busbar: max. 10kA Standard terminal block: max. 10kA Page 12 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

88 UL 508A Important changes Transformer peak-let-through currents can be used to protect Branch circuits! Feeder circuit Main Disconnect Current limiting device Every Transformer is current limiting Branch circuit Short circuit protection Short circuit protection Short circuit protection contactor contactor contactor Overloadrelay Overloadrelay motor motor heater Page 13 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

89 UL 508A Important changes Previous rule: A.) Transformer < 5kVA and max. 120V sec. => max. 2kA at the secondary side all devices at the secondary side for at least 2kA B.) Transformer < 10kVA => max. 5kA at the secondary side. all devices at the secondary side for at least 5kA C.) All other transformers are not considered as current limiting same short-circuit current at the secondary and primary side SCCR 2 ka SCCR 5 ka SCCR x ka Page 14 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

90 UL 508A Important changes New rule: Loads provided by a Transformer with isolated secondary acc. to UL 508A SB4.3.1 Possibility 1: For transformer with marked or known impedance (Z acc. To UL 508A), the maximum secondary short circuit current will be calculated as follows: All devices located at transformer secondary shall be the calculated short circuit current rating (I sc ) SCCR of the loads = Interrupting rating of primary overcurrent protection device Page 15 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

91 UL 508A Important changes New rule: Loads provided by a Transformer with isolated secondary acc. to UL 508A SB4.3.1 Possibility 2: For transformer with unknown impedance (Z acc. To UL 508A) or 2,1%, the maximum secondary short circuit current will be calculated as in possibility 1 described (assumption Z = 2,1 %) or determined with Table SB4.3 (single phase) respectively SB4.4 (three phase) as follows: 1. Transformer kva maximum value column 1 and 2. Secondary voltage not smaller as values in column 2. If the secondary voltage is between the values, the next smaller voltage shall be used. Table SB4.3 Table SB4.4 Page 16 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

92 UL 508A Important changes Page 17 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

93 UL 508A Important changes Page 18 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

94 Device Data / Reports Device data ULguidelines; chapter Siemens SIRIUS Contactor 3RT1035 Short Circuit Current 5kA, 600V Page 24 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

95 Device Data / Reports Reports See report in the annex Magnetic Motor Control Type F Page 25 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

96 Support from Siemens Page 26 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

97 Thank Questions? you for your attention! Note / Disclaimer The circuit examples and interpretations of the standard are non-binding and do not claim completeness concerning configuration, equipping and contingencies. They do not represent customized solutions but merely provide support for typical tasks. Every user of this presentation assumes full responsibility for the proper operation of the described products. This presentation does not relieve you of your obligation to ensure safe application, installation, operation and maintenance. By using this presentation you agree that Siemens cannot be held liable for damage beyond the above-described liability provisions. We reserve the right to modify this document at any time without prior announcement. Many tables and texts in this description were directly taken from NEC 2011 and the UL standards. Every user has to regularly check whether the quoted references are still up-to-date. The final decision as to whether an application complies with the corresponding American standards and regulations lies with the end customer or any organization respectively authorized by him (e.g. authority having jurisdiction, AHJ). Siemens Industry Inc All Rights Reserved.

98 UL guidelines, chapter 6.2 / 6.3 Motor Branch Circuits acc. to UL Definition of Terms / Explanations Overview of Basic Devices Construction Types acc. to UL 508 Self-Protected Combination Motor Controller Various types Single Installation and Group Installation Suitable for Tap Conductor Protection in Group Installation Explanations Siemens Industry Inc All Rights Reserved.

99 Overview standard devices UL guidelines, chapter Motor Starter Combination Example Pos Basic Type UL Norm 21 Field wiring Terminal on the device 11 Disconnect switch UL Fuse, e.g. Class J 12 Circuit Breaker Overload & Short Circuit UL 98 UL / 5 Controller UL Overload protection UL Internal Wiring UL 489 UL 508A NEC Field wiring Terminal UL 1059 As minimum, the following shall be installed acc. to UL508A: Disconnect (a) Short Circuit Protection (b) c d MCS VB2 a b 3RT 3RU / 3RB 3RV 3VL 24 Motor disconnect (Option) UL Motor, 460 V SF 1,15 (name plate) Motor Controller (c) Overload Protection (d) 8WA 3LD Page 2 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

100 Construction Types in acc. with UL508 / Table 76.2 Various constructions of combination motor controllers A / B M M Page 4 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

101 Construction Types in acc. with UL508 / Table 76.2 Various constructions of combination motor controllers C / D x M x M Page 5 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

102 Construction Types in acc. with UL508 / Table 76.2 Various constructions of combination motor controllers E / F x M x M Page 6 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

103 Definition of BCPD acc. UL Branch Circuit Protection Device (BCPD): A fuse or circuit breaker that has been evaluated to a safety standard for providing overcurrent protection UL fuse: FUSE, BRANCH CIRCUIT TYPE A fuse of Class CC, G, H, J, K, L, R, and T. These fuses are able to provide branch circuit protection UL 489 Circuit Breaker inverse time: INVERSE-TIME CIRCUIT BREAKER A circuit breaker in which a delay is introduced into the tripping action of the circuit breaker. The delay decreases as the magnitude of the current increases. These circuit breakers are able to provide branch circuit protection. Page 7 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

104 BCPD Branch Circuit Protection Devices Inverse time C.B. UL489 C.B. / CSA 22.2 No RV27/28 3RV17/18 3VL Class CC Fuses acc. UL248-4 / CSA 22.2 No NW Page 8 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

105 Motor Starters vs. Type E combination motor controller Type E combination motor controller acc. UL508 / CSA 22.2 No. 14 Approved as branch circuit protection device for motor loads only! 3RV2 Manual motor controller / motor starter acc. UL508 / CSA 22.2 No. 14 Approved as motor disconnect and motor overload protection can not be used as a branch circuit protection device! 3RV2 3LD Page 9 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

106 Definition of Terms / Explanations Service Factor SF Definition: The service factor - SF - is a measure of periodically overload capacity at which a motor can operate without overload or damage. The NEMA standard Service Factor for fully enclosed motors is SF 1.0 SF: service factor SF 1.0 / SF 1.15 to be used for the overload setting of an overload relais Important parameter for the setting of the Bi-metal relay. Only a Service Factors other than SF1.0 have to be indicated on the nameplate. SF1.0 is normally not indicated on the name plate. NEC (1) Note: SF = 1.0 corresponds to a setting value of 0.92 FLA SF 1.15 corresponds to a setting value of 1.0 FLA Page 11 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

107 Assembly Options Single or Group Installation UL 508A differentiates between 2 installation variants: Single installation = single motor circuit (chapter 31.3) Group installation = motor groups (chapter 31.4) 1. Single installations Manual self-protected combination motor controller (SPCMC) acc. to UL508 Type E (only 3RV) Manual / magnetic self-protected combination motor controller (SPCMC) acc. to UL508 type F (e.g. 3RA1 load feeder = 3RV+3RT) Manual motor controller (only 3RV) Manual / magnetic motor controller (3RV and 3RT) 2. Group installations / branch circuit protection for motors Group installations Group installations with additional approval Suitable for tap conductor protection in group installation (additional tests with UL508) Page 12 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

108 Self-Protected Combination Motor Controller Solution with SIRIUS Excerpt from the UL configuration manual with tested combinations (with UL report) Page 14 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

109 Assembly Options Single Installation Manual / magnetic motor controller Solution with SIRIUS Excerpt from the UL configuration manual with tested combinations (with UL report) Page 16 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

110 What is the definition of a Group Installation Definition of a Group Installation: A group of loads, consisting of two or more motors, or one or more motors and other loads, are able to be protected by a single set of branch circuit fuses or inverse time circuit breaker as specified in Method A, B or C (see the following slides for details) BCPD Starter Starter Contactor Motor Motor Heater Page 17 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

111 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method A General requirements Branch circuit protection not max., or not > Each motor not >6A FLA, Branch Circuit Protection not greater than any component restrictions, and Coordinated with requirements for any non-motor loads per For a group that includes other (non-motor) loads, additional branch circuit fuses or inverse time circuit breakers shall be provided in each circuit Exception: Where the ampere rating of the branch circuit protection determined in does not exceed the applicable branch circuit protection requirements in for a non-motor load in the group, additional branch circuit protection is not required Page 18 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

112 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method A Assembly Step 3: Branch Circuit Protection Device does not exceed: 125V BCPD Starter Starter Contactor Step 1: Ceck starter for specific instructions (UL certificate) Motor Motor Heater Step 2: FLA of each motor may not exceed 6A Step 4: Branch Circuit Protection meets requirements in for non-motor loads Page 19 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

113 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method B General requirements BCPD size complies with single motor requirements for each individual motor Tap conductors not less than 1/3 the ampacity of branch circuit conductor, or not less than 1/10 the amp rating of branch circuit protection if Manual Motor Controller marked Suitable as Tap Conductor Protection in Group Installations Additional branch circuit protection for non-motor loads unless branch circuit protection device also meets 31.5 through 31.8 for non-motor loads in group Fuses: 225 percent of full-load motor current for a time delay (dual element) fuse 400 percent of full-load motor current for a non-time delay fuse or a Class CC time delay fuse not exceeding 600 amperes; Page 20 Issue 07/2013 Industrial Control Panels and Machinery for North America C.B. inverse time: 400 percent of full-load motor current for an inversetime circuit breaker not exceeding 100 amperes 300 percent of full-load motor current for an inversetime circuit breaker rated more than 100 amperes; Siemens Industry Inc All Rights Reserved.

114 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method B Assembly Step 1: Select Branch Circuit Protection Device not to exceed single motor sizing for smallest motor Step 3: Check if non-motor loads require additional protection Step 2: Ampacity of tap conductors not less than 1/3 ampacity, or 1/10 rating of BCPD when manual motor controller is marked as Suitable for tap conductor protection in group installations BCPD Starter Starter Contactor Motor Motor Heater Page 21 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

115 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method C General requirements All controllers marked for group installation with BCPD sized at the lesser of: - the smallest group installation marking for BCPD, or - the calculated BCPD for the largest motor + FLAS s of other loads Tap conductors sized per Method B Non-Motor loads also protected per Method B Applies to power conversion equipment with DC converter and inverter sections on common bus Page 22 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

116 Sizing of Branch Circuit Protection for Motor Groups acc. UL/NEC Method C Assembly Step 2: Size BCPD based on smaller 1.) the size required of the largest motor plus FLA of all other loads or 2.) lowest BCPD marking for motor grouping BCPD Step 4: Check if non-motor loads require additional protection Starter Starter Contactor Step 3: Verify tap conductor size Motor Motor Heater Step 1: Verify that all load side devices are Suitable for tap conductor protection in Group Installations Page 23 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

117 How to size the Branch Circuit Protection Device for Motor Groups acc UL/NEC? Example for UL Circuit Breaker: 1.) 11 Amps x 250% = 27,5 Amps 2.) 27,5A + 5A + 5A = 37,5 Amps 37,5 Amps for the BCPD Next Standard size is 40 Amps BCPD Verify if non-motor loads require additional protection Starter Starter Contactor Tap Conductors: 125% of the largest motor load + 100% of additional loads = 23,75 Amps 23,75 / 3 = 7.9 Amps UL508A Table 28.1 for ampacities of conductors: minimum 14 AWG for Power Circuits Motor Motor Heater 11 Amps 5 Amps 5 Amps Page 24 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

118 Example with the 3RM1 motor starter Ampacity Y 1/3 Amapacity X X 16A max per infeed Y Page 25 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

119 Explanations, Notes, Rating Plate Data Motor branch circuit nameplate of 3RV circuit breakers Self-protected combination motor controller (E / F) with reference to adapter max. permissible short circuits for 240 V, 480Y/277 V, 600Y/347 V Reference to the use in combinations with contactors and soft starters Max. permissible motor s full load amps (FLA max.) Manual motor controller, suitable as tap conductor protection, in group installations motor disconnect suitable for group installation max. permissible grouping fuse / CB max. permissible short circuit current Example: 3RV10 21 Indication of hp ratings for V, 230 V, 460 V, 575 V Breaks all phases simultaneously Only CU wires for 75 C are allowed General safety instructions Ratio of 125% of tripping current : setting current Page 26 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

120 Explanations, Notes, Rating Plate Data Motor branch circuit rating plate of 3RT contactors Contactor Indication of hp ratings for motors, at 115 V, 230 V, 460 V, 575 V Breaks all phases simultaneously General purpose values (non-motor operated loads) Permissible short circuit at 600 V AC, value 5 ka derived from UL508, higher values from report Maximum permissible RK5 fuse, maximum permissible circuit breaker Only Cu lines for 75 C are allowed Screwdriver specification: Pozidrive 2 Permissible torque in pound per inch and Nm Example: 3RT10 2 Wire stripping length, permissible wire cross sections in AWG Note: are placeholders to be supplemented with the technical data of the product (size-related). Page 27 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

121 Explanations, Notes, Nameplate Data Motor branch circuit nameplate of overload relays Ratio of tripping current : setting current = 125% Maximum permissible RK5 fuse, maximum permissible circuit breaker Permissible torque in pounds per inch and Nm Certified for 600 V AC (max.) Only Cu lines for 75 C are allowed Safety note for AUTO RESET Example: 3RU11 2 Permissible short circuit at 600 V AC, value 5 ka derived from UL508, higher values from report Note: are placeholders to be supplemented with the technical data of the product (size-related). Page 28 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

122 Changes in the standard for industrial control devices Complete transition till Nov UL is aligned and harmonized with the IEC This change is addressed not addressed to the user of industrial control devices but to the manufacturer of control devices! Page 29 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

123 What does the transition from UL508 to UL affect? Different type of coordination are available for Electromechanical contactors and motor-starters Type of co-ordination 1 Type of co-ordination 2 Page 30 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

124 Panel Marking According UL508A SB5 Page 31 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

125 Predictable Reaction Type of co-ordination 1 UL (excerpt): With type of co-ordination 1, the contactor or starter must not endanger persons or the installation in the event of a short circuit and need not be suitable for further operation without repair and renewal of parts. Result for the machine or machine operation: The contactor and/or overload relay might be defective The components might be unsuitable for further operation Insecure personnel and system protection with further operation Uncertain functionality of the components The components should be replaced Consequences: Long downtimes High repair efforts Page 32 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

126 Predictable Reaction Type of Co-Ordination 2 UL (excerpt): With type of co-ordination 2, the contactor or starter must not endanger persons or the installation in the event of a short circuit and must remain suitable for further operation. The risk of contact welding is given. In this case, maintenance instructions have to be provided by the manufacturer. Note: If manufacturer recommendations are not complied with for the application of an SCPD, the type of coordination is questionable. The risk of contact welding is given. Manufacturer s maintenance instruction for opening the contact pieces is required Result for the machine or machine operation The contactor and/or overload relay may be slightly welded Easy breaking-open of contacts required in case of welding Consequences: Short downtimes Low repair effort Page 33 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

127 Where can I get these values? Ask your supplier for SCCR ratings for Type 1 and Type 2 co-ordination Page 34 Issue 07/2013 Industrial Control Panels and Machinery for North America Siemens Industry Inc All Rights Reserved.

128 Thank Questions? you for your attention! Note / Disclaimer The circuit examples and interpretations of the standard are non-binding and do not claim completeness concerning configuration, equipping and contingencies. They do not represent customized solutions but merely provide support for typical tasks. Every user of this presentation assumes full responsibility for the proper operation of the described products. This presentation does not relieve you of your obligation to ensure safe application, installation, operation and maintenance. By using this presentation you agree that Siemens cannot be held liable for damage beyond the above-described liability provisions. We reserve the right to modify this document at any time without prior announcement. Many tables and texts in this description were directly taken from NEC 2011 and the UL standards. Every user has to regularly check whether the quoted references are still up-to-date. The final decision as to whether an application complies with the corresponding American standards and regulations lies with the end customer or any organization respectively authorized by him (e.g. authority having jurisdiction, AHJ). Siemens Industry Inc All Rights Reserved. 6_Motor branch circuits acc. to UL508A_en.ppt

129 Protection of other Loads and Consumers UL guidelines, Chapter Branch circuit protection for non-motor operated loads Determination of full-load ampacity Usable devices

130 Branch Circuit Protection for Non-Motor Operated Consumers Dimensioning Heating load Min. 125% of the rated current of the heating load Max. 60A rated current Dimensioning of wire cross-section acc. to the current of the branch circuit protection General device protection Individual device NON-motor operated a) Acc. to the technical device documents b) Max. 20A for devices whose rated current does not exceed 13.3A (if a) is not available) c) Max. 150% for devices whose rated current exceeds 13.3A (if a) is not available) Individual device primarily motor operated load Acc. to the technical device documents Or acc. to the dimensioning for motor branch circuits Or acc. to the rules for receptacles Exception: devices with flexible cord protection provided via receptacle! Page 2 Issue 04/2014 Industrial Control Panels and Machinery for North America

131 Determination of the Full-Load Ampacity acc. to UL508A, Art.50.6 Applicable to: transformers, heating loads and capacitors Ratings: Transformers in [VA] Heating loads in [W] Capacitors in [VAR] Formulas: Single-phase: Ampacity [A] = (power in VA, W or VAR) (rated voltage [V]) Three-phase: Ampacity [A] = (power in VA, W or VAR) ( 3 (rated voltage [V])) Page 3 Issue 04/2014 Industrial Control Panels and Machinery for North America

132 Frequency Converters / Variable-Speed Drives / Soft Starting Load devices with power semiconductors must be assessed separately This means: Branch circuit protection ONLY according to data in the UL Report Branch circuit protection may be omitted if integrated (UL Report) Page 4 Issue 04/2014 Industrial Control Panels and Machinery for North America

133 UL 508A Important changes Sizing of branch-circuit protection of a variable speed drive if not specified by the manufacturer instruction Up to now As of now Page 5 Issue 04/2014 Industrial Control Panels and Machinery for North America

134 SCCR ratings for Siemens VFD s Short Circuit Current Ratings (SCCR) for Siemens Standard Drives All the specified drives have a high SCCR as a result of testing with UL. All drives have internal solid state short circuit protection for protection of the drive output but this has not been evaluated for branch circuit protection (BCP) Our UL certification allows all drives (which have an integral solid state protection circuit) to adopt a high SCCR equal to the interrupt current rating of the branchcircuit protective device protecting the drive. Example. If a UL listed combination motor protector (Rated current 40A) with an interrupt current rating of 65kA is used as the branch circuit protection device for a MICROMASTER 440 frame size C 400V 11kW drive, the high SCCR of the drive is equal to that of the combination motor protector, which is 65kA. Hence by selection of the correct UL listed BCP device, with appropriate interrupt rating for the application, any high SCCR rating can be achieved for the above drives. Page 6 Issue 04/2014 Industrial Control Panels and Machinery for North America

135 Example Excerpt from SINAMIC G120/130/150 UL Report Note: A semiconductor fuse according to UL does NOT represent a suitable branch circuit protective device (unless specified in the UL Report) 3NE1 A semiconductor fuse can be ADDITIONALLY installed at any time 3NE1 813 SIEMENS SITOR Fuse Semiconductor LV HRC design UL recognized only! Page 8 Issue 04/2014 Industrial Control Panels and Machinery for North America