Welcome! Siemens Industry Inc All rights reserved.

Transcription

1 Welcome! Siemens Industry Inc All rights reserved.

2 Welcome! Introduction to Industrial control panels for North America and Europe Overview about important: - North American standards and regulations - Requirements and approach for the European Market Siemens Industry Inc All rights reserved.

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 10/2013 Agenda UL and IEC/EN CE workshop Siemens Industry Inc All rights reserved. / I IA CE S V

4 Note / exclusion of liability The typical circuit diagrams and interpretations of the standard are not binding and do not claim to be complete regarding configuration, equipment or any other eventuality. They do not represent any client-specific solutions and are only intended to offer assistance for typical tasks. Each person viewing this presentation is responsible for the correct operation of the products described. This presentation does not relieve you of your responsibility regarding safe handling when using, installing, operating, and maintaining the equipment. By viewing this presentation you agree that Siemens cannot be made liable for possible damage beyond the above mentioned liability clause. We reserve the right to make changes and revisions to this informational documentation without prior announcement. When writing these guidelines, a lot of tables and texts were lifted straight from the relevant standards. All users of this documentation must always check whether the items quoted are still up to date or not. The final decision about the appropriateness of applying the applicable standards must be made by the user of this documentation. The reproduction of this presentation and its distribution, utilization or the dissemination of its contents to third parties is not permitted. Page 4 Issue date 10/2013 Agenda UL and IEC/EN CE workshop Siemens Industry Inc All rights reserved. / I IA CE S V

5 Workshop agenda Introduction to the Seminar / Basic differences between North America and Europe Overview on North American requirements Codes, standards, organizations and recent changes UL approval, terms and definitions SCCR short circuit current ratings Motor branch circuits Protective measures acc. UL/NFPA Overview on Requirements in Europe Introduction to European Directives CE marking and assessment procedure IEC and EN standards Required verifications for control panels Protective measures acc. IEC/EN Helpful tools, efficient planning & documentation Support, further information Page 5 Issue date 10/2013 Agenda UL and IEC/EN CE workshop Siemens Industry Inc All rights reserved. / I IA CE S V

6 Now you certainly have questions... Page 6 Issue date 10/2013 Agenda UL and IEC/EN CE workshop Siemens Industry Inc All rights reserved. / I IA CE S V

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 Siemens Industry Inc All rights reserved.

8 - Introduction to the workshop - Basic differences between North America and Europe Why this seminar? Seminar objectives Basic differences between North America and Europe Siemens Industry Inc All rights reserved.

9 Why this seminar? Increasing confusion and uncertainty when deciding which European Directives are important for control panel design Which standards are important for control panel design and how can these be fulfilled? Uncertainty with regard to the question: "Who holds the responsibility?" How should the documentation be produced? What is the distinction between the important Machinery directive [MD] 2006/42/EC and Low-voltage directive [LVD] 2006/95/EC? To what extent is the EMC directive 2004/108/EC for control panel design important? Page 2 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

10 Seminar objectives Overview and introduction to European Directives and standards Refresher and update for the relevant North American standards (UL/NFPA) To provide assistance and support in understanding important European Directives and standards To clarify the relationships between relevant standards and their significance for control panel design To perform the required verifications of the control panel as per IEC & -2 Suggestions for practical documentation that conforms to North American and IEC/EN standards and European Directives Page 3 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

11 The importance of standards In general, standards are: Standards are not laws yet they are followed willingly and strictly. When they are followed they are similar to laws Reflect rules / the state of technology and are considered a proven method in the respective field of application A support function used to achieve a minimum level of procedure (in different countries, etc.) Fulfilling standards is not an achievement it is the minimum expected The highest protection objectives of standards are: the safety of people, livestock, and property Page 4 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

12 Organizations The global use of standards IEC, e.g.: EN, VDE, BS, NF UL / NFPA / NEMA UL / NFPA / NEMA / IEC CSA / UL / NFPA / NEMA Page 5 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

13 Differences between Europe & North America Europe Responsibility of the equipment manufacturer Responsibility of the operator/user 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/user Protection targets and requirements are defined by laws Certification/listing of products Verification by independent NRTL/AHJ (Electrical Inspector) (third-party certification) + Operating permission of AHJ Page 6 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

14 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 7 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

15 Basic differences between U.S. and CE Markets Standards Comparison between USA and IEC IEC IEC IEC IEC IEC IEC Page 8 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

16 Significant differences between IEC and UL control panels 1 Main disconnecting mean Lighting Receptacle GFCI 2 3 Enclosure interlocking Identification of conductors 4 13 Power distribution MTW conductors 5 12 Protection devices according UL508A, UL test report Substitution devices without UL - approvals 6 Max. Control voltage 11 Transformer protection 10 Motor controller 9 Terminal Blocks 8 Enclosure 7 Page 9 01/2013 Introduction, Basic differences Siemens Industry Inc All rights reserved. / I IA CE S V

17 Questions? Siemens Industry Inc All rights reserved.

18 Codes, standards and organizations Organizations Standards and Codes Recent changes in the codes and standards

19 Standard Organizations extract UL: Underwriter Laboratories publishes standards and certifies products in accordance with its own and other standards (CSA, IEC,...). Headquarter: Northbrook, Illinois. In general, UL certification is not required by law. However, all Authorities accept UL certification without restrictions. CSA: The Canadian Standard Association publishes standards and certifies products in accordance with its own and other standards (UL, IEC,...). Headquarter: Toronto NFPA: The National Fire Protection Association publishes diverse regulations and directives such as NEC, NFPA79; NFPA70E; NFPA70B ANSI: The American National Standards Institute is the highest level national standard authority in the USA. Most regulations are based on the ANSI standard Page 2 Issue date 10/2013 Codes, Standards and Organizations

20 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 3 Issue date 10/2013 Codes, Standards and Organizations

21 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 4 Issue date 10/2013 Codes, Standards and Organizations

22 NRTLs According to OSHA Excerpt from Page 5 Issue date 10/2013 Codes, Standards and Organizations

23 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 6 Issue date 10/2013 Codes, Standards and Organizations

24 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 7 Issue date 10/2013 Codes, Standards and Organizations

25 Standards Definition Industrial Control Panels in acc. with NEC 2011 Components suitable for an Industrial Control Panel UL508A, Table SA1.1 Definition: 2 or more devices installed in the power circuit including their control circuits and control devices e.g. motor starter Page 8 Issue date 10/2013 Codes, Standards and Organizations

26 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 - Irrigation Equipment 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 9 Issue date 10/2013 Codes, Standards and Organizations

27 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 10 Issue date 10/2013 Codes, Standards and Organizations

28 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 11 Issue date 10/2013 Codes, Standards and Organizations

29 Examples of Industrial Machines Covered by NFPA79 Annex C Page 12 Issue date 10/2013 Codes, Standards and Organizations

30 Example of the scope of application standards NEC (NFPA70) *) NFPA79 *) UL508A *) *) *) *) Page 13 Issue date 10/2013 Codes, Standards and Organizations

31 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 14 Issue date 10/2013 Codes, Standards and Organizations

32 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 15 Issue date 10/2013 Codes, Standards and Organizations

33 Recent changes - National Electrical Code (NEC) 2014 Maximum voltage of an Industrial Control Panels has been changed from 600V to 1000V Page 16 Issue date 10/2013 Codes, Standards and Organizations

34 Recent changes - 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 17 Issue date 10/2013 Codes, Standards and Organizations

35 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 18 Issue date 10/2013 Codes, Standards and Organizations

36 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 19 Issue date 10/2013 Codes, Standards and Organizations

37 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 20 Issue date 10/2013 Codes, Standards and Organizations

38 NEC Ed Spacings in branch circuits and control circuits acc. UL508A Page 21 Issue date 10/2013 Codes, Standards and Organizations

39 NEC Ed Spacings in feeder circuits acc. UL508A Page 22 Issue date 10/2013 Codes, Standards and Organizations

40 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 23 Issue date 10/2013 Codes, Standards and Organizations

41 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 24 Issue date 10/2013 Codes, Standards and Organizations

42 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 25 Issue date 10/2013 Codes, Standards and Organizations

43 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 26 Issue date 10/2013 Codes, Standards and Organizations

44 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 27 Issue date 10/2013 Codes, Standards and Organizations

45 UL 508A Important changes Page 28 Issue date 10/2013 Codes, Standards and Organizations

46 UL 508A Important changes Page 29 Issue date 10/2013 Codes, Standards and Organizations

47 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 30 Issue date 10/2013 Codes, Standards and Organizations

48 UL 508A Important changes Protection devices in dc control circuits above 32V shall be approved for the rating equal or greater Excerpt from Certificate of compliance of Siemens supplementary protectors 5SY Page 31 Issue date 10/2013 Codes, Standards and Organizations

49 NFPA 79 Ed Grounding NFPA79 Ed The continuity of the equipment groundling (protective bonding) circuit shall be ensured by effective connections through conductors or structural members. NFPA79 Ed The continuity of the equipment grounding (protective bonding) circuit shall be ensured by effective connections through conductors Page 32 Issue date 10/2013 Codes, Standards and Organizations

50 Thank Questions? you for your attention!

51 UL Approvals, Terms and Definitions Definitions Terms and their background Markings

52 Definition of Terms Listings / Symbols 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 2 Issue date 10/2013 UL approvals, Terms and Definitions

53 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 Page 3 Issue date 10/2013 UL approvals, Terms and Definitions

54 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 Page 4 Issue date 10/2013 UL approvals, Terms and Definitions

55 Definition of Terms UL Product Categories Definition of the CCN (Category Code Number): Numerical or alphanumerical character string for the exact identification of products according to UL standards! Example: Product Contactors (magnetic motor controllers) Overcurrent relays (overload relays) Standard UL508 Industrial Control Equipment UL-Listed NLDX NKCR UL-Recognized NLDX2 NKCR2 Page 5 Issue date 10/2013 UL approvals, Terms and Definitions

56 SA1 list UL508A Page 6 Issue date 10/2013 UL approvals, Terms and Definitions

57 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 7 Issue date 10/2013 UL approvals, Terms and Definitions

58 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 8 Issue date 10/2013 UL approvals, Terms and Definitions

59 Definition of Terms Persons Electrically instructed person Electr. hazards / risks can be avoided through appropriate instruction or supervision Electrically skilled person Electr. risks can be detected and hazards avoided through appropriate training and experience Qualified person Knowledge and skills regarding the design and operation of electrical equipment Safety training on the respective hazards (NEC 2008 Handbook Art. 100) Page 9 Issue date 10/2013 UL approvals, Terms and Definitions

60 Overview and Definition Definitions acc. UL508A: Feeder circuit: Definition: FEEDER CIRCUIT 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 10 Issue date 10/2013 UL approvals, Terms and Definitions

61 Overview and Definition -DISC -FU1 -FU2 -T -CON1 -OL1 -FU3 -CON2 -OL2 -M1 -M2 Control Circuit Boundary Feeder and Branch Viewing Direction Page 11 Issue date 10/2013 UL approvals, Terms and Definitions

62 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 or Line Terminals 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 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 12 Issue date 10/2013 UL approvals, Terms and Definitions

63 NEC 2014 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 13 Issue date 10/2013 UL approvals, Terms and Definitions

64 Spacings in branch circuits and control circuits acc. UL508A Page 14 Issue date 10/2013 UL approvals, Terms and Definitions

65 Spacings in feeder circuits acc. UL508A Page 15 Issue date 10/2013 UL approvals, Terms and Definitions

66 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 16 Issue date 10/2013 UL approvals, Terms and Definitions

67 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 17 Issue date 10/2013 UL approvals, Terms and Definitions

68 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 18 Issue date 10/2013 UL approvals, Terms and Definitions

69 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! 480Y/277V AC L1 L2 L3 I k 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 19 Issue date 10/2013 UL approvals, Terms and Definitions

70 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 20 Issue date 10/2013 UL approvals, Terms and Definitions

71 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 /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 21 Issue date 10/2013 UL approvals, Terms and Definitions

72 Agreements Between Manufacturer and Customer The standard offers support in the form of a ready-made questionnaire in Annex B / NFPA79 (only informative!) Page 22 Issue date 10/2013 UL approvals, Terms and Definitions

73 Thank Questions? you for your attention!

74 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

75 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 10/2013 SCCR Short Circuit Current Rating

76 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 3 Issue 10/2013 SCCR Short Circuit Current Rating

77 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 4 Issue 10/2013 SCCR Short Circuit Current Rating

78 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 5 Issue 10/2013 SCCR Short Circuit Current Rating

79 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 6 Issue 10/2013 SCCR Short Circuit Current Rating

80 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 7 Issue 10/2013 SCCR Short Circuit Current Rating

81 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 8 Issue 10/2013 SCCR Short Circuit Current Rating

82 Possibilities of Increasing the SCCR Step 4 Use of transformers SB Page 9 Issue 10/2013 SCCR Short Circuit Current Rating

83 Possibilities of Increasing the SCCR Step 4 Use of transformers SB Page 10 Issue 10/2013 SCCR Short Circuit Current Rating

84 Possibilities of Increasing the SCCR Step 4 Use of transformers 1.) Single Phase Transformers: Transformer Full-Load Current (IFL) = (Transformer kva x 1000) / Voltage* Short Circuit Current (ISC line-to-line) = ((Transformer Full Load Current (IFL )) / Transformer Impedance (Z) 2.) Three Phase Transformers: Transformer Full-Load Current (IFL) = (Transformer kva x 1000) / (Voltage** x 1.732) Short Circuit Current (ISC line-to-line-to-line) = ((Transformer Full Load Current (IFL )) / Transformer Impedance (Z) Page 11 Issue 10/2013 SCCR Short Circuit Current Rating

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 12 Issue 10/2013 SCCR Short Circuit Current Rating

86 Possibilities to Increase the SCCR Step 4 Page 13 Issue 10/2013 SCCR Short Circuit Current Rating 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.

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 14 Issue 10/2013 SCCR Short Circuit Current Rating

88 Establishment of SCCRs Example 1? What is the SCCR value for this combination? With circuit breaker: SCCR rating for combinations 3VL circuit breaker Example: Feeder circuit breaker (MCCB; UL489): rated current 40A / 480V, switching capacity 35kA at 480V SCCR 5kA Downstream the feeder circuit breaker (feeder), several motor branch circuits may be installed. Establishment of the short circuit current (SCCR) in acc. with NEC (4): SCCR has to be determined acc. to a specified procedure (UL508A suppl. SB or UL guide; chapter 5.8). BCPD 3RV17 circuit breaker 3RT contactor 3RB overload relay M BCPD, circuit breaker acc. to UL489: rated current 15A / 480V, switching capacity 35kA at 480V Contactor / overload relay rated current 10A / 460V max. short circuit current load: 5kA / 480V Motor operating current 10A Page 15 Issue 10/2013 SCCR Short Circuit Current Rating

89 Establishment of SCCRs Example 2? What is the SCCR value for this combination? With circuit breaker: SCCR rating for combinations SCCR 35kA Downstream the feeder fuse (feeder), several motor branch circuits may be installed. Establishment of the short circuit current (SCCR) in acc. with NEC (4): SCCR has to be determined acc. to a specified procedure (UL508A suppl. SB or UL guide; chapter 5.8). Fuse BCPD 3RV17 circuit breaker 3RT contactor 3RB overload relay M Example: Fuse is current limiting: rated current 20A, switching capacity = 100kA prospective Short Circuit Current = 50kA let-through value 3kA (class CC) (in acc. with UL508A; table SB4.2) BCPD, circuit breaker acc. to UL489: rated current 15A / 480V, switching capacity 35kA at 480V Contactor / overload relay rated current 10A / 460V max. short circuit current load: 5kA / 480V Motor operating current 10A Page 16 Issue 10/2013 SCCR Short Circuit Current Rating

90 Establishment of SCCRs Example 3? What is the SCCR value for this combination? With circuit breaker: SCCR rating for combinations 3RV17 circuit breaker Example: Circuit breaker in acc. with UL489: rated current 30A / 480V, switching capacity 35kA / 480V SCCR 5kA Downstream the feeder circuit breaker (feeder), several motor branch circuits may be installed. Establishment of the short circuit current (SCCR) in acc. with NEC (4): SCCR has to be determined acc. to a specified procedure (UL508A suppl. SB or UL guide; chapter 5.8). Fuse 3RT contactor 3RB overload relay M Fuse is current limiting: rated current 20A, switching capacity = 100kA prospective Short Circuit Current = 50kA let-through value 3kA (class CC) (in acc. with UL508A; table SB4.2) Contactor / overload relay rated current 10A / 460V max. short circuit current load: 5kA / 480V Motor operating current 10A Page 17 Issue 10/2013 SCCR Short Circuit Current Rating

91 Establishment of SCCRs Example 4? What is the SCCR value for this combination? With circuit breaker: SCCR rating for combinations SCCR 65kA 3VL circuit breaker Example: Feeder circuit breaker (MCCB; UL489) as main disconnecting means: rated current 40A / 480V, switching capacity 100kA / 480V Downstream the feeder circuit breaker (feeder), several motor branch circuits may be installed. Attention Up to max. 480Y/277V Establishment of the short circuit current (SCCR) in acc. with NEC (4): SCCR has to be determined acc. to a specified procedure (UL508A suppl. SB or UL guide; chapter 5.8). 3RV20 MV 3RT2 contactor M Motor starter acc. to UL508, type E / F rated current 20A, switching capacity 65kA / 480Y/277V See UL report E156943; Vol.1; Sec.18 Motor Motor operating current 20A Page 18 Issue 10/2013 SCCR Short Circuit Current Rating

92 Establishment of SCCRs Example 5? What is the SCCR value for this combination? With circuit breaker: SCCR rating for combinations SCCR 65kA 3VL circuit breaker Example: Feeder circuit breaker (MCCB; UL489) as main disconnecting means: rated current 40A / 480V, switching capacity 100kA / 480V Downstream the feeder circuit breaker (feeder), several motor branch circuits may be installed. Attention Up to max. 480Y/277V Establishment of the short circuit current (SCCR) in acc. with NEC (4): SCCR has to be determined acc. to a specified procedure (UL508A suppl. SB or UL guide; chapter 5.8). 3RV20 MV 3RT2 contactor M Motor starter acc. to UL508, type E / F rated current 20A, switching capacity 65kA / 480Y/277V See UL report E156943; Vol.1; Sec.18 Motor Motor operating current 20A Page 19 Issue 10/2013 SCCR Short Circuit Current Rating

93 Device Data / Reports Device data ULguidelines; chapter Siemens SIRIUS Contactor 3RT1035 Short Circuit Current 5kA, 600V Page 20 Issue 10/2013 SCCR Short Circuit Current Rating

94 Device Data / Reports Reports See report in the annex Magnetic Motor Control Type F Page 21 Issue 10/2013 SCCR Short Circuit Current Rating

95 Support from Siemens Page 22 Issue 10/2013 SCCR Short Circuit Current Rating

96 Thank Questions? you for your attention!

97 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

98 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 UL 98 UL Circuit Breaker Overload & Short Circuit UL / 5 Controller UL Overload protection UL Internal Wiring 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 10/2013 Motor Branch Circuits acc. UL508A

99 Definition of Terms / Explanations Inverse-Time Circuit Breaker Circuit breaker with overload and short-circuit protection (UL489) Instantaneous Trip Circuit Breaker Circuit breaker with short-circuit protection (UL489) Solid State Motor Controller Industrial control equipment rated in hp (horsepower) for remote switching of motors (UL508) Magnetic Motor Controller Industrial control equipment rated in hp (horsepower) for remote switching of motors (UL508 Part II) Manual Motor Controller Industrial control equipment rated in hp (horsepower) for manual switching of motors (UL508 Part III) including motor overload protection, i.e. separate overload relay would not be neccessary Overload Relay Industrial control equipment for motor overload protection, set to motor current FLA (UL508 PART XI) Page 3 Issue 10/2013 Motor Branch Circuits acc. UL508A

100 Construction Types in acc. with UL508 / Table 76.2 Various constructions of combination motor controllers A / B M M Page 4 Issue 10/2013 Motor Branch Circuits acc. UL508A

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 10/2013 Motor Branch Circuits acc. UL508A

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 10/2013 Motor Branch Circuits acc. UL508A

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 10/2013 Motor Branch Circuits acc. UL508A

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 Page 8 Issue 10/2013 Motor Branch Circuits acc. UL508A 3NW

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! Slash voltage rating 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! Delta voltage rating! Page 9 Issue 10/2013 Motor Branch Circuits acc. UL508A 3RV2 3LD

106 Definition of Motor Starters There are two types of Motor Starters certified for use in USA and Canada Motor Starters and Type E Combination Motor Controllers. Motor Starters do not offer any branch circuit protection. Type E Combination Motor Controllers offer branch circuit protection for motors. Manual Motor Controller (Motor Starter): A device designed for manual-only control of a motor under normal and locked rotor conditions. A motor controller may incorporate a means to automatically interrupt motor overload currents. Some manual motor controllers are provided with limited short circuit interrupting capabilities; however, the certification report will state that the ability of these devices to open the short circuit currents was not evaluated. A manual motor controller is evaluated to CAN/CSA-C22.2 No. 14. Type E Combination Motor Controller: A single device designed to control a motor under normal and locked rotor conditions, disconnect the motor branch circuit and interrupt short circuit and overload overcurrents having non-replaceable or integral discriminating overload and short circuit sensors, and provided with one or more sets of contacts where the contacts cannot be isolated for separate testing. A Type E combination motor controller is evaluated to the requirements of CSA Standard C22.2 No Page 10 Issue 10/2013 Motor Branch Circuits acc. UL508A

107 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 10/2013 Motor Branch Circuits acc. UL508A

108 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 10/2013 Motor Branch Circuits acc. UL508A

109 Basic rules for sizing a motor branch circuit Example Page 13 Issue 10/2013 Motor Branch Circuits acc. UL508A

110 Self-Protected Combination Motor Controller Solution with SIRIUS Excerpt from the UL configuration manual with tested combinations (with UL report) Page 14 Issue 10/2013 Motor Branch Circuits acc. UL508A

111 Self-Protected Combination Motor Controller Solution with SIRIUS UL508 type F Type F is a combination of: self-protected combination motor controller (UL508 type E) ) + magnetic motor controller / solid state motor controller The completely assembled solution for type F starters: 3RA load feeders (type F magnetic motor controller) Assembly: 3RV circuit breaker (with power supply terminal) + 3RT contactor Page 15 Issue 10/2013 Motor Branch Circuits acc. UL508A

112 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 10/2013 Motor Branch Circuits acc. UL508A

113 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 10/2013 Motor Branch Circuits acc. UL508A

114 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 10/2013 Motor Branch Circuits acc. UL508A

115 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 10/2013 Motor Branch Circuits acc. UL508A

116 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 10/2013 Motor Branch Circuits acc. UL508A 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;

117 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 10/2013 Motor Branch Circuits acc. UL508A

118 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 10/2013 Motor Branch Circuits acc. UL508A

119 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 Page 23 Issue 10/2013 Motor Branch Circuits acc. UL508A Step 1: Verify that all load side devices are Suitable for tap conductor protection in Group Installations

120 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 10/2013 Motor Branch Circuits acc. UL508A

121 Example with the 3RM1 motor starter Ampacity Y 1/3 Amapacity X X 16A max per infeed Y Page 25 Issue 10/2013 Motor Branch Circuits acc. UL508A

122 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 10/2013 Motor Branch Circuits acc. UL508A

123 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 10/2013 Motor Branch Circuits acc. UL508A

124 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 10/2013 Motor Branch Circuits acc. UL508A

125 Changes in the standard for industrial control devices Complete transition till Nov UL is aligned and harmonized with the IEC This change is not addressed to the user of industrial control devices but to the manufacturer of control devices! Page 29 Issue 10/2013 Motor Branch Circuits acc. UL508A

126 What does the transition from UL508 to UL affect? Type of co-ordination 1 Type of co-ordination 2 Page 30 Issue 10/2013 Motor Branch Circuits acc. UL508A

127 Panel Marking According UL508A SB5 Page 31 Issue 10/2013 Motor Branch Circuits acc. UL508A

128 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 10/2013 Motor Branch Circuits acc. UL508A

129 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 10/2013 Motor Branch Circuits acc. UL508A

130 Where can I get these values? Ask your supplier for SCCR ratings for Type 1 and Type 2 co-ordination Page 34 Issue 10/2013 Motor Branch Circuits acc. UL508A

131 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 35 Issue 10/2013 Motor Branch Circuits acc. UL508A

132 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 36 Issue 10/2013 Motor Branch Circuits acc. UL508A

133 Overload Protection NFPA Drives / amplifiers with integrated, approved overload protection may be used for motor protection Data in the UL Report (e.g. for frequency converter, servo drive, etc.) In motor groups, each motor must be feature a separate overload protection Every motor must feature a separate overload protection! Page 37 Issue 10/2013 Motor Branch Circuits acc. UL508A

134 Example Excerpt from SINAMIC G120/130/150 UL Report 3NE1 Note: A semiconductor fuse according to UL does NOT represent a suitable branch circuit protective device (unless specified in the UL Report) A semiconductor fuse can be ADDITIONALLY installed at any time 3NE1 813 SIEMENS SITOR Fuse Semiconductor LV HRC design UL recognized only! Page 38 Issue 10/2013 Motor Branch Circuits acc. UL508A

135 Thank Questions? you for your attention! 6_Motor branch circuits acc. to UL508A_en.ppt

136 Protection Against Electric Shock Protection against direct contact Protection against electric shock in case of indirect contact (fault case)

137 Protection Against Direct Contact General: Energized parts must be protected against direct contact when: -AC: U 50 V - DC: U 60V Measures: (1) Insulation (2) Enclosure (3) Interlocking of enclosures (4) Restricted access to the enclosure Page 2 Issue date 07/2013 Industrial Control Panels and Machinery for North America

138 Protection Against Direct Contact (1) Insulation Energized parts must meet the following conditions: Complete insulation (only removable through disassembly!) Mechanical, chemical, electrical and thermal resistance Paints, varnishes and coatings do not offer sufficient protection against electric shock Page 3 Issue date 07/2013 Industrial Control Panels and Machinery for North America

139 Protection Against Direct Contact (2) Enclosures Enclosures and enclosure openings must comply with the requirements according to: UL508 UL508A UL50 or NEMA 250. Exception: Unapproved enclosures can be checked by means of a test finger; checking of all openings after disassembly of all parts removable without tools Touching of energized parts with the test finger must not be possible Page 4 Issue date 07/2013 Industrial Control Panels and Machinery for North America

140 Test Finger NFPA Page 5 Issue date 07/2013 Industrial Control Panels and Machinery for North America

141 Protection Against Direct Contact (3) 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 6 Issue date 07/2013 Industrial Control Panels and Machinery for North America

142 Protection Against Direct Contact (3) Interlocking of Enclosures Conditions The interlocking must be defeatable by means of a tool With the door open and the "ON" position, the interlocking must be enabled upon closing With the door is open, switch-on must be mechanically blocked; defeat must be possible without tools ("deliberate action") Caution: Devices on the inside of industrial control panels must be protected against unintended contact when U 50 V; either by means of device characteristics or through barriers in a range of 50 mm (2 inches) Page 7 Issue date 07/2013 Industrial Control Panels and Machinery for North America

143 Protection Against Direct Contact (3) Interlocking of Enclosures Solutions Mechanical solutions: UL-compliant with UL508A, NFPA 79, JIC and NEC UL Guideline, Chapter Max-flex drive Enclosure type: 1, 3R, 12 Interlocking module 8UC Enclosure type: 1 Standard references: UL508A: 30.4 / / NFPA79: / / Page 8 Issue date 07/2013 Industrial Control Panels and Machinery for North America

144 Protection Against Direct Contact (3) Interlocking of Enclosures mechanical solutions Examples for mechanical interlocking solutions provided by Siemens Page 9 Issue date 07/2013 Industrial Control Panels and Machinery for North America

145 Protection Against Direct Contact (3) Interlocking of Enclosures Solutions Electrical solutions: 1 key switch for defeat 1 timing relay 1 undervoltage release per main disconnecting means Diverse auxiliary relays 1 limit switch per door, preferably with tumbler Motorized operating mechanism UL Guideline, Chapter Note: The electrical interlocking must meet the same conditions as the mechanical interlocking! Page 10 Issue date 07/2013 Industrial Control Panels and Machinery for North America

146 Protection Against Direct Contact (4) Access to Industrial Control Panels When qualified skilled persons with respective experience open an industrial control panel without main disconnecting means, the following conditions must apply: the door can be opened by means of a key or tool, or the door can be opened without defeat, key or tool when all energized parts are covered or encapsulated in a finger-safe manner Page 11 Issue date 07/2013 Industrial Control Panels and Machinery for North America

147 Protection Against Indirect Contact (Fault Case) NFPA General: Protection against indirect contact is to prevent hazardous states in case of faults (e.g. due to insulation faults between energized and exposed parts) Measures: (1) Protection through double insulation (2) Protection through automatic supply disconnection Page 12 Issue date 07/2013 Industrial Control Panels and Machinery for North America

148 Protection Against Indirect Contact (1) Double Insulation Double insulation is to prevent the occurrence of hazardous touch voltages due to faults in the basic insulation Operating equipment must be respectively marked (UL approval!) Operating equipment either must be listed or tested in a comparable manner Page 13 Issue date 07/2013 Industrial Control Panels and Machinery for North America Double insulation" symbol (protection class 2)

149 Protection Against Indirect Contact (2) Protection Through Automatic Supply Disconnection General: Protection through automatic supply disconnection of affected circuits by means of the respective overcurrent protective device in case of faults Prerequisites for the safety measure: 1. Exposed, conductive parts must be grounded 2. Application of overcurrent protective devices for automatic disconnection Page 14 Issue date 07/2013 Industrial Control Panels and Machinery for North America

150 Thank Questions? you for your attention!