Article 393 Low Voltage Suspended Ceiling Power Distribution System
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1 Article 393 Low Voltage Suspended Ceiling Power Distribution System IAEI Eastern Section Meeting Annapolis, MD October 8,2014 Jack Lyons NEMA Northeast Field Rep
2 Ben Franklin was right on!! If there is no other Use discover'd of Electricity, this, however, is something considerable, that it may help to make a vain Man humble To electrise plus or minus, no more needs to be known than this
3 The Forces of Change The Perfect (Disruptive) Storm
4 PROBLEM: Mismatched AC and DC Power Distribution Requirements ENERGY SOURCES MIXED AC & DC ELECTRIC DEVICES TYPICALLY DC AC/DC Site Generation DC Photovoltaic Electronic Lighting AV/IT Devices vs. DC Campus Fuel Cells DC Wind Power HVAC Actuators Sensors & Controls Data & Telecom Centers DC Power Storage AC Line Power Electric Vehicles Security & Safety RESULT: Lost Opportunity to Reduce Consumption, Improve Quality, Reliability Technology has created better ways to integrate these systems together EMerge Alliance Corp
5 The Desired State: A simplified AC/DC hybrid coupled power network ENERGY SOURCES ELECTRO-ACTIVE DEVICES AC/DC Site Generation DC Campus Fuel Cells DC Photovoltaic DC Wind Power Coupled AC/DC Power Sources DC Power Distribution Management Intelligent Wired & Wireless Controls Electronic Lighting HVAC Actuators Sensors & Controls AV/IT Devices Data & Telecom Centers DC Power Storage AC Line Power Electric Vehicles Security & Safety OPPORTUNITY: More flexibility, less energy, less capital, more reliability? EMerge Alliance Corp
6 Standard: Occupied Space Developed for commercial interiors 380 VDC Bus 24 VDC Bus Copyright 2012 EMerge Alliance
7 Our Mission An open industry association developing standards leading to the rapid adoption of DC power distribution in commercial buildings. These innovative standards integrate interior infrastructures, power, controls and devices in a common microgrid platform to facilitate the hybrid use of AC and DC power throughout buildings for unprecedented design and space flexibility, greater energy efficiency and improved sustainability. Emerge Alliance 24 VDC Occupied Space Standard.
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9 OUTLINE Development proposed in the 2011 NEC ROP Standard Developed by Emerge Alliance Listing by components (System) Definitions of new products and functionality Compliant to Art 393 Installation by multiple trades Uses (Lighting, HVAC, Controls, Other Systems, A/V, Security) Accessories (Luminaires, Occupancy, Actuators)
10 Article Scope This article covers the installation of low-voltage suspended ceiling power distribution systems. New to 2014 Task Group Originally proposed for 2011 as an Extension to Article 720 Revise to create a new Article Goes Beyond the Scope of 720 And Article 411 LV Luminaires
11 Article Scope This article covers installations operating at less than 50 volts, direct current or alternating current Other Articles Direct current or alternating-current installations operating at less than 50 volts, as covered in through 411.8; Part VI of Article 517; Part II of Article 551; Parts II and III and (B) of Article 552; through 650.8; thro ugh 669.9; Parts I and VIII of Article 690; Parts I and III of Article 725; or Parts I and III of Article 760 shall not be required to comply with this article. Lighting systems operating at 30 volts or less are covered by Article 411, not Article Health Care RVs Park Trailers Pipe Organs Electroplating 690 -PV Systems Power Supplies Fire Alarm
12 Article Scope This article covers lighting systems operating at 30 volts or less and their associated components. This article also covers lighting equipment connected to a Class 2 power source. Article 411 covers low-voltage interior and exterior (landscape) lighting systems consisting of a maximum 30-volt isolating power supply or a Class 2 power supply rated in conformance with Chapter 9, Tables 11(A) or 11(B).
13 Proposal NEC ROP Rejected but put on hold in the Comment Stage (C-90) Placed the Article in CMP 18 (Article 411) purview rather than CMP 3 (Article 720, 725) Proposal originally Art. 302 Changed to Art. 393 This proposal was developed by a subgroup of the NEC DC Task Force of the Technical Correlating Committee. The Task Force is chaired by John R. Kovacik, Underwriters Laboratories, the Subtask Group that developed this proposal consisted of the following people: Panel 3 Chairman Paul Casparro, representing the JATC of the International Brotherhood of Electrical Workers and Panel 3; Subtask Group Chairman Wendell Whistler, representing Intertek, Inc. and Panel 3; Lawrence S. Ayer representing Biz Com Electric of the Independent Electrical Contractors Association and Panel 3; Mike O boyle, representing Philips Inc. and Panel 18; Mark C. Ode representing Underwriters Laboratories Inc. and Panel 3; Audi Spina, representing Armstrong Ceiling Inc. and special expert on low voltage ceiling grids; and Randy Wright, representing RKW Consulting and Panel 18.
14 Art Listing Requirements Suspended ceiling power distribution systems and associated fittings shall be listed as in 393.6(A) or (B). (A) Listed System. Low-voltage suspended ceiling distribution systems operating at 30 volts ac or less or 60 volts dc or less shall be listed as a complete system, with the utilization equipment, power supply, and fittings as part of the same identified system. (B) Assembly of Listed Parts. A low-voltage suspended ceiling power distribution system assembled from the following parts, listed according to the appropriate function, shall be permitted: (1) Listed low-voltage utilization equipment (2) Listed Class 2 power supply (3) Listed or identified fittings, including connectors and grid rails with bare conductors (4) Listed low voltage cables in accordance with , conductors in raceways, or other fixed wiring methods for the secondary circuit Art Listing Required. Lighting systems operating at 30 volts or less shall comply with 411.4(A) or 411.4(B). Class 2 power sources and lighting equipment connected to Class 2 power sources shall be listed. (A) Listed System. Lighting systems operating at 30 volts or less shall be listed as a complete system. The luminaires, power supply, and luminaire fittings (including the exposed bare conductors) of an exposed bare conductor lighting system shall be listed for the use as part of the same identified lighting system. (B) Assembly of Listed Parts. A lighting system assembled from the following listed parts shall be permitted: (1) Low-voltage luminaires (2) Low-voltage luminaire power supply (3) Low-voltage luminaire fittings (4) Cord (secondary circuit) for which the luminaires and power supply are listed for use (5) Cable, conductors in conduit, or other fixed wiring method for the secondary circuit The luminaires, power supply, and luminaire fittings (including the exposed bare conductors) of an exposed bare conductor lighting system shall be listed for use as part of the same identified lighting system.
15 UL Standard 2577 Suspended Ceiling Grid Low Voltage Systems and Equipment UL Scope 1.1 These requirements cover suspended ceiling grid low voltage systems and equipment intended for installation and use in accordance with the: In Canada: Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1, In the United States: National Electrical Code (NEC), ANSI/NFPA The suspended ceiling grid low voltage systems covered by this standard are intended to be installed as a suspended ceiling grid that provides mechanical support for the ceiling tiles and provides electrical connections between the low voltage power supply and the low voltage equipment. The low voltage system consists of the following components: a) An isolating type low voltage power supply with output(s) operating at 30 V (42.4 V peak) or less and not exceeding Class 2 power limits, b) A grid rail power distribution system to provide power from the Class 2 power supply to one or more pieces of Class 2 powered equipment, and c) Class 2 powered equipment that is electrically connected to the suspended ceiling grid low voltage system. 1.3 The suspended ceiling grid low voltage system is intended to be permanently connected, for indoor dry locations, and installed in accordance with the following requirements: In Canada: Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1, and the National Building Code of Canada. In the United States: National Electrical Code (NEC), ANSI/NFPA 70, the International Building Code (IBC), and the International Mechanical Code (IMC). This standard also covers suspended ceiling grid low voltage systems intended for use in air-handling spaces. Art (UL 2043)
16 1.4 This standard does not address any supplemental or alternative requirements for suspended ceiling grid low voltage systems intended for use in: In Canada: a) Hazardous locations as specified in the Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1; b) General patient care areas or critical patient care areas as defined by Section 24 of the Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1; or c) Emergency systems as defined by Section 46 of the Canadian Electrical Code, Part I, Safety Standard for Electrical Installations, CSA C22.1. In the United States: a) Hazardous locations as specified in the National Electrical Code (NEC), ANSI/NFPA 70; b) General patient care areas or critical patient care areas as defined by Article 517 of the National Electrical Code (NEC), ANSI/NFPA 70; or c) Emergency systems as defined by Article 700 of the National Electrical Code (NEC), ANSI/NFPA This standard does not evaluate the suspended ceiling grid low voltage system for seismic requirements in accordance with the: In Canada: National Building Code of Canada. In the United States: International Building Code (IBC). 1.6 This standard does not evaluate the suspended ceiling grid low voltage systems for fire resistance. Art (a)
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18 INSTALLATION INSTRUCTIONS (IFFA cont.) These products are intended for installation in accordance with Article 411 of the NEC. Installation instructions accompanying the product describe the Class 2 wiring method intended to be used between the Class 2 power supply, the low-voltage grid-rail power distribution system, and the low-voltage luminaires or accessories in accordance with Articles 411 and 725 of the NEC. The Class 2 power supply is intended for permanent installation in accordance with the wiring methods in Chapter 3 of the NEC.(Art 400) All electrical connections are intended for installation by qualified electrical installers. The mechanical components of the system, including support of the grid rails, is intended to be in accordance with the "International Building Code" and the "International Mechanical Code." Each smallest unit package or carton is provided with installation instructions that contain a) a product description, b) a statement to identify the suspended-ceiling low-voltage system, c) a description of the part(s) intended to be used, and d) instructions describing how the part(s) are intended to be installed. Each unit package or carton of suspended-ceiling low-voltage system grid-rail-bus section is provided with installation instructions that identify the system series number or model name and model or catalog number of the system. The installation instructions also specify the electrical ratings of the system and identify the method of mounting.
19 Uses Permitted Low-voltage suspended ceiling power distribution systems shall be permanently connected and shall be permitted as follows: (1) For listed utilization equipment capable of operation at a maximum of 30 volts ac (42.4 volts peak) or 60 volts dc (24.8 volts peak for dc interrupted at a rate of 10 Hz to 200 Hz) and limited to Class 2 power levels in Chapter 9, Table 11(A) and Table 11(B) for lighting, control, and signaling circuits. (2) In indoor dry locations. (3) For residential, commercial, and industrial installations. (4) In other spaces used for environmental air in accordance with (C), electrical equipment having a metal enclosure, or with a nonmetallic enclosure and fittings, shall be listed for use within an air-handling space and shall have adequate fire-resistant and low-smoke-producing characteristics and associated wiring material suitable for the ambient temperature.
20 Uses Not Permitted Suspended ceiling power distribution systems shall not be installed in the following: (1) In damp or wet locations (2) Where subject to corrosive fumes or vapors, such as storage battery rooms (3) Where subject to physical damage (4) In concealed locations (5) In hazardous (classified) locations (6) As part of a fire-rated floor-ceiling or roof-ceiling assembly, unless specifically listed as part of the assembly (7) For lighting in general or critical patient care areas (not emergency circuits,essential systems)
21 Definitions Busbar Busbar Support Grid Bus Rail Reverse Polarity Protection Connectors: Load Rail to Rail Power Feed Pendant
22 Grid Bus Rail Ceiling System Busbar Support One Circuit Busbar Two Circuit Busbar
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24 Cross Sectional of Two Circuit Grid Bus Rail
25 Cross Sectional of One Circuit Grid Bus Rail The Association of Electrical and
26 Proper placement of Suspension wires
27 Connectors (Load, Feed, Rail to Rail, Pendant)
28 Cable and Connectors EMerge Alliance Registered UL2577 ANSI/NFPA 70 Previously Tyco Electronics
29 Two Circuit Main Beam Populated with Feed, Fixture clip, Device Cable Bottom Device connector
30 Power Feed Connector
31 Bottom Connector 30 Ft limitation on length for power feed #12 AWG Top Connector Device Cables 10 Ft 18 AWG Power feed keyed on Connector, Device connectors not keyed Devices may or may not be Polarity sensitive, Flip device connector!
32 (B) Insulated Conductors. Exposed insulated secondary circuit conductors shall be listed, of the type, and installed as described as follows: (1) Class 2 cable supplied by a listed Class 2 power source and installed in accordance with Parts I and III of Article 725 (2) Wiring methods described in Chapter 3
33 (A&B) Installation Installation Requirements Multiple Trades Division 9 -- Division Building Materials Electrical CSI Architects / Designers Construction Specification Index Construction Specifications Institute (CSI)
34 Installation. (A) General Requirements. Support wiring shall be installed in a neat and workmanlike manner. Cables and conductors installed exposed on the surface of ceilings and sidewalls shall be supported by the building structure in such a manner that the cable is not damaged by normal building use. Such cables shall be supported by straps, staples, hangers, cable ties, or similar fittings designed and installed so as not to damage the cable. Informational Note: Suspended ceiling low-voltage power grid distribution systems should be installed by qualified persons in accordance with the manufacturer s installation instructions.
35 Power Supplies
36 Wiring Methods on Supply Side of the Class 2 or Class 3 Power Source Conductors and equipment on the supply side of the power source shall be installed in accordance with the appropriate requirements of Chapters 1 through 4. Transformers or other devices supplied from electric light or power circuits shall be protected by an overcurrent device rated not over 20 amperes. Exception: The input leads of a transformer or other power source supplying Class 2 and Class 3 circuits shall be permitted to be smaller than 14 AWG, but not smaller than 18 AWG if they are not over 12 in. (305 mm) long and if they have insulation that complies with (B) Wiring Methods and Materials on Load Side of the Class 2 or Class 3 Power Source Class 2 and Class 3 circuits on the load side of the power source shall be permitted to be installed using wiring methods and materials in accordance with either (A) or (B). (B) Class 2 and Class 3 Wiring Methods. Conductors on the load side of the power source shall be insulated at not less than the requirements of and shall be installed in accordance with and cable types and listings (cmp,cmr,cmx) Exception No. 1: As provided for in for elevators and similar equipment. Exception No. 2: Other wiring methods and materials installed in accordance with the requirements of shall be permitted to extend or replace the conductors and cables described in and permitted by (B). Exception No. 3: Bare Class 2 conductors shall be permitted as part of a listed intrusion protection system where installed in accordance with the listing instructions for the system.
37
38 Article 725 (Chapter 9 Table)
39 DC instead of AC due to Wiring method exposed in DC circuits
40 Disconnecting Means. (A) Location. A disconnecting means for the Class 2 supply to the power grid system shall be located so as to be accessible and within sight of the Class 2 power source for servicing or maintenance of the grid system. (B) Multiwire Branch Circuits. Where connected to a multiwire branch circuit, the disconnecting means shall simultaneously disconnect all the supply conductors, including the grounded conductors. PS PS
41 (C) Reverse Polarity (Backfeed) Protection of Direct- Current Systems. A suspended ceiling low-voltage power distribution system shall be permitted to have reverse polarity (backfeed) protection of dc circuits by one of the following means: (1) If the power supply is provided as part of the system, the power supply is provided with reverse polarity (backfeed) protection; or (2) If the power supply is not provided as part of the system, reverse polarity or backfeed protection can be provided as part of the grid rail busbar or as a part of the power feed connector
42 Grounding Power Supply feed from a grounded system and equipment grounding/bonding as per 250 Load Side of Supply Shall not be grounded
43 Integration of other DC Power Systems Wind, PV, Batteries, EV Interactive systems, Stand alone systems or Grid interactive, ESS
44 Input to Grid Distribution PV Article Art 690 Fuel Cells Art 692 Wind systems Art 694 Batteries Art 480 Others?
45 Grid Distribution Systems Energy Code requirements Square Foot loading IECC.9W/ Ft² NEC 3VA/ Ft² Lighting Load Calculations
46 Energy Monitoring Article Reducing Service Rating Software to monitor Power supplies Exception: Where the building is designed and constructed to comply with an energy code adopted by the local authority, the lighting load shall be permitted to be calculated at the values specified in the energy code where the following conditions are met: (1) A power monitoring system is installed that will provide continuous information regarding the total general lighting load of the building. (2) The power monitoring system will be set with alarm values to alert the building owner or manager if the lighting load exceeds the values set by the energy code. (3) The demand factors specified in are not applied to the general lighting load.
47 Basic Control Communications Favors an open protocol fringe System Layer Fringe Building Automation Open Local Controllers Supervisory Hybrid ZigBee - Wireless PLC Wired Other Proprietary Control Proprietary Equipment Embedded Control/Sensor Local Controls & Gateways Exclusivity System Local Device Protocol 47 BACnet LonWorks ModBus Other Proprietary
48 DC Products Lighting
49 To see the different products integrated into the Grid System /RegisteredProducts.aspx
50 Future???? What would Benjamin Franklin Say NOW? Thank you for your time
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