This document replaces what was Supplement SA in the Second Edition of UL 508A, and subsequently Appendix C in the Third Edition of UL 508A. PowerPoint Templates. The user shall stipulate the maximum available possible short-circuit at the incoming supply to the manufacturer. Look for any possible current limiting components to possibly modify SCCR according to SB4.3. Overview of Supplement SB from UL 508A. UL 508A SB5.1.1 Effective April 25, 2006, UL 508A approved panels will be required to include on its nameplate rating of industrial control panels its Short Circuit . since 2006, manufacturers of custom 2 . Discussion of the following proposal to serve as preliminary review: Add UL61800-5-1 and UL 60939-3 Component Standards to UL 508A. The determination of the SCCR for all components is based either on device markings or component data sheets supplied by the manufacturer of the components. BUSSMANN SERIES 3) Establish the . the matrix shown in Figure 2 lists the components in the sample panel from Figure 1, the component Sccrs and the source of the rating information. Thanks in advance for any input! The town is known nowadays mainly for its regionally used shopping centre, the Isenburg-Zentrum (IZ), the Hugenottenhalle, the Hotel Kempinski Frankfurt, the Autokino Gravenbruch (the oldest drive-in cinema in Europe), the . Industrial control panels are listed in accordance with ANSI/UL 508A, the Standard for Industrial Control Panels, and covered by UL product category NITW (Industrial Control Panels) as factory-wired assemblies of industrial control equipment, such as motor controllers, switches, relays, and auxiliary devices. In addition, in the case of a combination motor controller, all components as specified by the manufacturer must be used for the SCCR to apply. UL508AEd2018-Standard for Industrial Control Panels-This revision of ANSI/UL 508A dated April 16, 2020 includes the following changes in requirements: - ECBT2 . Simply adding a current-limiting fuse or current-limiting circuit breaker on the line-side of the panel/machine does not guarantee the panel/machine is protected and NEC compliant. But first, we want to consider feeding the panels with current-limiting fuses. The combination of the passive component and its protective device are, by definition, located in a branch circuit. White Paper by Paul. Is one approved method for determining an ICP short circuit current rating of individual power circuit in Panelview 800 Graphic Terminals, all in a one day Class the heavy lifting, supply LOADS, From Table SB4.2 of UL 508A Supplement SB Table SB4.1 ( see below ) of Supplement SB &! Look at the individual power circuit components in each branch circuit according to SB4.2. rating from Table SB4.1 (see below) of Supplement SB. So to do this we would put fuses ahead of any branch circuit in our box, plus use a 100kA SCCR rated distribution block, and use a 200kA SCCR rated fused disconnect. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. UL508A is a safety standard for Industrial Control Panels adopted by Underwriters Laboratory which is an approved method in determining SCCR referenced by NEC article 409. structures this activity to be distinct and separate from its conformity assessment bodies. Excerpt from UL 508A, Table SB4.1, "Assumed maximum short-circuit . Thanks in advance for any input! Event Information. Ip ) shown in Figure 1 ) Effective Date the line or load side of a branch circuit fed. Standard for Industrial Control Panels. Electrical and Industrial | Power management solutions | Eaton Step 2 - When the current limiting protective devices are incl uded in a feeder circuit, determine the modified rating (SB4.3) based upon the let-through values of the current limiting protective devices. This marking is typically based on proper overcurrent protection by a fuse or circuit breaker. A review of the steps we made showed that in each step we had determined the overall SCCR of the control panel. Connect with us in person or online, around the globe. A line drawing of the Internet Archive headquarters building faade. See how we put safety science to work to help create a safer, more secure and sustainable world for you. structures this activity to be distinct and separate from its conformity assessment bodies. UL Standard for Safety for Industrial Control Panels, UL 508A Second Edition, Dated December 20, 2013 Summary of Topics This revision of UL 508A is issued to correct Table SB4.1 to remove the reference for Multiwire (power distribution) lug, which did not reach consensus during the proposal process. 10 kA: Short-circuit-based configuration of the industrial control panel shall be performed by the manufacturer. It takes into account the interrupting rating of the main fuse or circuit breaker, Any manufacturer can be used if the equipment indicates maximum ampere circuit breaker or maximum ampere class fuse, Architecture, Engineering and Construction, Information and Communications Technology, Residential and Commercial Air Conditioning, Lighting Safety Testing and Certification, Enhance sustainability throughout properties, Computer and Hardware Performance Benchmarking, Benchmark Automation Platform for Enterprises, Sustainability and ESG Reporting for Enterprise, GxP Training and Qualification for Life Sciences, Occupational Health for Clinics and Hospitals, Product Design, Compliance and Regulatory Insights, Regulatory Compliance Software for Life Sciences, Security and Compliance for Connected Devices, Wire and Cable Design and Manufacturing Software, Microgrids, Distributed Energy Resources & Hybrid Projects, Materials Data Collection and Management, Top 10 Questions on Determining SCCR of Industrial Control Panels per the 3rd Edition of UL 508A. This method has flaws but seemed to be sufficient in most applications. A: With an industry that is constantly changing and improving, this will provide greater flexibility for panel manufacturers in the selection and use of Listed and Recognized components. Components which shall be included for SCCR consideration An illustration of a magnifying glass. For this purpose, the relevant and non-relevant components for the SCCR consideration according to UL 508A must be identified. - Use assumed SCCRs in table SB 4.1 of Supplement SB - Use the tested SCCR from component combinations per UL508 ; Modify the SCCR of certain series combinations if current-limiting devices are used in the feeder circuit. 2. in the SB supplement to UL 508A The NEC off ers two veri cation options. Identify the lowest interrupting rating of overcurrent protective devices in the industrial control panel. As per UL508A Supplement SB, Saginaw Control and Engineerings' air conditioners have a default SCCR of 5 kA. UL panel shops can do that. Manufacturers' published let-through data for specific fuses cannot be used, as fuses are . It is not permitted to increase the branch-circuit overcurrent device interrupting rating. An illustration of a horizontal line over an up pointing arrow. B BKearney Member Mar 15, 2012 #1 I want to get the boxes we build up to 100kA SCCR as a standard. either the formula method in SB4.3.1(a) or by using Tables SB4.3 or SB4.4 as follows: For a power transformer with a rated kVA not exceeding that in Column 1 of Table SB4.3 (single phase) or Table SB4.4 (three phase) and a specified secondary voltage not less than one of the values listed in Column 2, where Training -Kendall Electric. Must be adequate for the following components with max to 600V or!. In accordance with Supplement SB4.2, apart from certain exceptions, all components in the power circuit shall be considered when determining the SCCR and shall express an SCCR in amperes or kiloamperes with specification of the voltage. Most power circuit components can be tested for an optional high-fault rating that may require a specific circuit breaker or fuse. This is typically the case for intermediate fuses (nonstandard case size) at short circuit currents of 50kA and 200kA. 14 Table SB4.1 - Unmarked Components 508A SB - Table SB4.1 - "Assumed" SCCR's - Line up with UL minimum test SC test requirements to attain listing - These minimum ratings limit "high fault" panel ratings - High Fault SCCR's on all components & combinations are top priority Copyright 2006 Rockwell Automation, Inc. Fuses or circuit breakers providing feeder or branch circuit protection must be able to interrupt a minimum of the short circuit current available at the line terminals of the equipment being protected. Studio 5000 Logix Designer Level 1: CompactLogix Fundamentals and Troubleshooting CCP298 - Upon completion of this course, you should be able to troubleshoot a previously operational CompactLogix system and restore normal operation. When your facility is completing its arc flash assessment, ask the third party that conducted the assessment if they considered all panel SCCR. 2) NEC and UL508A . Architecture, Engineering and Construction, Information and Communications Technology, Residential and Commercial Air Conditioning, Lighting Safety Testing and Certification, Enhance sustainability throughout properties, Computer and Hardware Performance Benchmarking, Benchmark Automation Platform for Enterprises, Sustainability and ESG Reporting for Enterprise, GxP Training and Qualification for Life Sciences, Occupational Health for Clinics and Hospitals, Product Design, Compliance and Regulatory Insights, Regulatory Compliance Software for Life Sciences, Security and Compliance for Connected Devices, Wire and Cable Design and Manufacturing Software, Microgrids, Distributed Energy Resources & Hybrid Projects, Materials Data Collection and Management, Industrial Control Panels and the Panel Shop Program, Determining Short-Circuit Current Rating (SCCR) for Machinery. No changes were made to the requirement to mark the short-circuit current rating on the nameplate. If the industrial control panel contains only control circuit components, marking the SCCR is not required (also noted in NEC section 409.110(4) Exception). Miesse/ IE / 3-1-07 12 UL 508A Supplement SB UL 508A Supplement SB describes three steps to determine the SCCR of industrial control panels: 1) Determine the SCCR of all individual power components by one of the following methods: - SCCR rating marked on the component . This SCCR is dependent upon the use of a specific type of protective device protecting the passive component. Were everywhere your business needs us to be. UL 508A, Industrial Control Panels . For information on this, see section 29.3.6 a-e. This marking is typically based on proper overcurrent protection by a fuse or circuit breaker. If they have not, have them review the arc flash assessment for the proper SCCR and identify panels with an inadequate SCCR. 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