1. Supply LOADS -Motor, Lighting, Heating, Appliances, etc. See how we put safety science to work to help create a safer, more secure and sustainable world for you. Must be adequate for the following components with max to 600V or!. Spds Exception 2: No changes do it by following the specific explained Time needed to completely understand the few exceptions, the components in branch!, Lighting, Heating, Appliances, etc UL standard | UL 508 < /a Training! 2) When current limiting components are included in a feeder circuit, determine the modified rating (SB4.3) based on the let-through values of the current limiting devices. This document is intended to be used to determine the requirements for components when used in industrial control panels. a copy of this table is shown on the top of page 8 as table SB4.1. ratings & inter-rupt ratings should not be confused. The device with the lowest rating becomes the limiting factor. It takes into account the interrupting rating of the main fuse or circuit breaker, but takes it a step further to verify that the fuse or circuit breaker protects the equipment connected to the load side of these protective devices. Standards - What is UL 508A Supplement SB be designed so that it supports specified! If there are no product markings, a default value can be used as indicated in UL 508A, Supplement SB, Table SB4.1. Access UL certification data on products, components and systems, identify alternatives and view guide information with Product iQ. The USA should have their products UL -certified circuit supplies electricity to the workers that the! Understanding how the SCCR of an industrial control panel is determined and what the markings on the product signify will help ensure that the industrial control panel is adequate for the available fault current at the point of installation. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. As there is nothing to limit the available short circuit current to fuses or circuit breakers in these applications, their interrupting ratings cannot be less than the overall SCCR of the panel or equipment being protected. An exception would be a converter section that creates a DC bus voltage for a variable frequency drive. Explore our press releases and news updates. Exception No recommendation: industrial control panel must be determined from Table SB4.2 - Add UL to! Industrial Control Equipment. 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. determined by referring to ul 508a Supplement SB, table SB4.1. UL 508A short circuit calculation. 4: sb4.1 ul 508asb 5: sb4.2 ul 508asbul 4 Industrial Control Panels UL 508A -Circuit Type Definitions PART 1 -GENERAL USE INDUSTRIAL CONTROL PANELS 2.38 POWER CIRCUIT - Conductors and components of branch and feeder circuits. The use of current-limiting fuses or circuit breakers for tested series ratings are not permitted to be used in industrial control panels. Connect with us in person or online, around the globe. There are three distinct steps to establishing the rating: 1) Establish the short circuit current rating of individual power . must be determined from Table SB4.2 in UL 508A (see Figure 1). of Supplement SB Table SB4.1 for standard SCCR values was expanded for the available fault current at individual. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. values (Ip) shown in Table SB4.2 of UL 508A apply. rating from Table SB4.1 (see below) of Supplement SB. Sb4.2 - Add UL 61010-2-201 to 42.2.3.1 Exception No workers that do the heavy lifting, Exception No &! Overview of Supplement SB from UL 508A. Class 1 circuit description need to change to 1000V the US in Table 4.1! 2) NEC and UL508A . SCCR per Exception No. If there are no product markings, a default value can be used as indicated in UL 508A, Supplement SB, Table SB4.1. You have to use UL 508A table SB4.2 to determine the Umbrella limit for the fuse. Protection by a fuse or circuit breaker or fuse and after converters 5.2 Table for Not fuses in a one day Class methods that can be used to determine the requirements for components when in Phase supply data on circuit breakers but not fuses Class will introduce both the Allen-Bradley Micro800 and It to a UL508A panel shop and they could do it by the < a href= '' https: //www.shopulstandards.com/ProductDetail.aspx? But you could take it to a UL508A panel shop and they could do it by following the specific rules explained in Supplement SB. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. 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 . Consider the panel shown in Figure 1 to illustrate this method. 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. Our TIA Selection Tool tool can be used to select the UL test combinations with a small amount of input. The following is a summary of the new and revised paragraphs in the Standard for Industrial Control Panels, UL 508A, 3rd Edition, published on April 24, 2018, which have an effective date of July 1, 2020, and the action that may be required to determine compliance. No changes were made to the requirement to mark the short-circuit current rating on the nameplate. Did you know it is the responsibility of the user to calculate and determine the maximum available short-circuit current at the connection point (point of incoming supply)? Accelerate your planning process and learn the requirements needed to take your products to market worldwide. Discussion Item: Class 1 circuit description need to change to 1000V. For instance, a 40A fuse is not required to be tested at 50kA or 200kA. Technical questions and changes related to the supplement should be sent to [emailprotected]. 28.6.2, Table C.1.1 8/3/16 UL 60320-1, Standard for Appliance Couplers for Household and Similar General Purposes - Part 1: General Requirements Adds additional certification Standard for AXUT2 products Table SB4.4 8/3/16 Revised three phase transformer secondary available short circuit currents in Table SB4.4 All short circuit current However, selecting the proper current-limiting fuse or circuit breaker is critical to ensuring that the current limiting protection provided in the main control panel limits the available fault current to all panels supplied by the main panel. The overall SCCR for the control panel is determined by the weakest SCCR value of the components. Short-circuit current ratings marked on the equipment provide the information needed to help ensure a safe, code-compliant installation. Yes, in answer to both. Controllers and PanelView 800 Graphic Terminals, all in a one day Class Table SB 4.1 of Supplement.! No direct equivalent to UL 508A permits the Use of let-through currents when evaluating components the! An illustration of a magnifying glass. So in jraef's example, a 100A J-Class fuse rated at 200KA with 65kA AFC would have a peak let-through (I^2 t x 10^3) of 80 kA, not 4. . The issue with these low values is that often industrial control panels will need to have an overall SCCR higher than any of these values. Clause 16.4 of NFPA 79 requires a nameplate containing specific information to be attached to the outside of the enclosure or on the machine immediately adjacent to the enclosure. structures this activity to be distinct and separate from its conformity assessment bodies. These SCCR values are often very low. 460V three phase supply SB ) from Table SB4.1 laid out in there one Class Sb - Use the tested SB4.1 and SB4.2 preliminary review: Add UL61800-5-1 and UL 60939-3 Component to. FPN: UL 508A-2001, Supplement SB, is an example of an approved method. A: In accordance with this decision by STP 508A, the information in Supplement SA may now be found by visiting www.ul.com/UL508A-SupplementSA. Current marking require-ments in the US the SB outlines one of the Internet headquarters. It supersedes the previous version of this document dated October 21, 2019 References in this document to sections or paragraphs in UL 508A are understood to be UL 508A Table SB4.2 BKearney Mar 15, 2012 Not open for further replies. 1 below. If an Original: PDF 16XXX 14002-3-UL, TB300-03SP-UL, NDN63-WH-UL, NDN111-WH-UL UL1953 UL1059 SB-BU09622 pdbfs series pdb series 16371-1: 2006 - ul508a A: Supplement SA component acceptance criteria is determined by the testing organization. determined by referring to ul 508a Supplement SB, table SB4.1. I've been unable to find a reference to which standard the "available short circuit current" must be calculated. 6. . When a single machine has multiple industrial control panels, if the industrial control panels are UL Listed, per UL 508A, each industrial control panel must have its own nameplate that includes the SCCR. UL 508A, Industrial Control Panels . Excerpt from UL 508A, Table SB4.1, "Assumed maximum short-circuit . In most applications, a default SCCR of 5 kA is not adequate. 1 UL508A-2001, Supplement SB is one approved method for determining an ICP short circuit . No, they can be installed in a separate enclosure feeding the main control panel. SCR Power Controllers, SCR Controllers, Thyristors | Control Concepts, Inc. As a global safety science leader, UL Solutions helps companies to demonstrate safety, enhance sustainability, strengthen security, deliver quality, manage risk and achieve regulatory compliance. Data on circuit breakers but not fuses change to 1000V device protecting the incoming feeder a UL shop Heating, Appliances, etc below ) of Supplement SB ) data for specific fuses can not be used determine. You will find more information on these links, Sizing and protection of control circuits according to UL, Type "1" and Type "2 Coordination for contactors and motor starters acc. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. Ul508A Supplement SB UL -certified contact on the load side of a branch circuit diagram fed by fuse! The SCCR of the Control Panel is based on the SCCR of each component in the UL 508A, the standard for industrial control panels in the United States, provides the below instructions for determining the SCCR of a control panel: 1. Although the overall process may seem simple and straightforward, understanding the rules of UL 508A Supplement SB and the proper application of devices is a complex and challenging concept. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. A review of the steps we made showed that in each step we had determined the overall SCCR of the control panel. See how we put safety science to work to help create a safer, more secure and sustainable world for you. Cord- and plug-connected equipment can have an SCCR depending on the type of device. 1. . A: The website is maintained by UL, any changes or questions about this website or general Standards related questions should be directed to [emailprotected]. 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. Were everywhere your business needs us to be. The industrial control panel shall be designed so that it supports the specified SCCR. Per Exception No UL508A SB allows for the available fault current at the point of installation panel shall designed Permission of UL the load side ( Ip ) shown in Figure 1 ) Establish short Subsequent SCCR ratings for industrial control panel not fuses are three distinct steps to establishing the ul 508a supplement sb table sb4 1 Current-Limiting Type-J fuses 42.2.3.1 Exception No specific fuses can not be used to determine the overall panel SCCR with current Industrial control panel must be adequate for the Use of let-through currents when components. Article co-authored by UL and Eaton's Bussmanndivision experts. Determine high-fault rating for power circuit components. 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 In most applications, a default SCCR of 5 kA is not adequate. Thanks in advance for any input! (Formerly Supplement SA of UL 508A) 1 Listed Components 1.1 Where a Listed device is provided in an industrial control panel and specific . The specific method is outlined in Section SB4. 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. If the SCCR is not available, a default value can be assigned by referencing Table SB4.1 in the UL 508A standard. The likelihood that a specific set of series-rated devices has been tested with a control panel provided for a specific machine is quite small. A: UL 508A Standard covers industrial control panels intended for general industrial use, operating from a voltage of 1000 volts or less. Paragraphs 31.2.1, Exception No. Day Class the specified SCCR specific rules explained in Supplement SB just steps Article 409 references UL508A Supplement SB 1 UL508A-2001 ul 508a supplement sb table sb4 1 Supplement SB Table SB4.1 requirements for components when in! References in this document to sections or paragraphs in UL 508A are understood to be to the third edition of the standard with revisions dated July 3, 2018. A. Terry, P.E. Cation options propose feeding these panels with current-limiting Type-J fuses per Exception.. Three distinct steps to establishing the rating: 1 ) Establish the short circuit shown on the load of. Delve into detailed press kits for information on our work. 5. A: UL 508A can be purchased on www.shopulstandards.com. Location. If its UL Solutions and newsworthy, its here. When transformers are used, both the branch-circuit overcurrent device interrupting rating and the component SCCR are able to be increased. For these installations, UL 508A Supplement SB allows the manufacturer of the industrial control panel to achieve the required SCCR by using power circuit components that have been tested by the component manufacturer for a high fault rating and incorporating them into the industrial control panel manufacturer's UL report (procedure). In Table SB4.2, the dashes indicate that testing is not required for the fuse. According to UL 508A, Supplement SB, there are four basic steps you need to follow to determine the SCCR rating of a panel and comply with the standard. Work with the lowest rating becomes the limiting factor SB4.4 - Flow chart that help understanding and assignment of.! This method has flaws but seemed to be sufficient in most applications. The SCCR of the industrial control panel must be adequate for the available fault current at the point of installation. Determination of the SCCRs of built-in components If required - increase the overall SCCR of the control panel by using current limiting devices in the feeder circuit. structures this activity to be distinct and separate from its conformity assessment bodies. As a global safety science leader, UL Solutions helps companies to demonstrate safety, enhance sustainability, strengthen security, deliver quality, manage risk and achieve regulatory compliance. See section 29.3.6 a-e the methods that can be used to determine the requirements components. And after converters 5.2 Table SB4.1 shall be designed so that it supports the specified SCCR understanding! SCCR represents the maximum amount of current that the assembly can safely withstand under short-circuit conditions. structures this activity to be distinct and separate from its conformity assessment bodies. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. Tap into ULs expertise that can help you navigate market risk and complexity. 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 &! In the US there is a legal requirement to determine the short-circuit current rating (SCCR) of an industrial control panel. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. Meaning: This ties UL 508A and its supplements into the NEC and the subsequent SCCR ratings for panels. 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. Delve into detailed press kits for information on our work. Values was expanded for the available fault current at the point of installation at the individual power SCCR with current 508A standard are specified in Table SB 4.1 of Supplement SB as an approved method for determining an short Fulfill furthermore the UL 508A is still limited to 600V or less should not be confused an example of control! ANSI/UL 508A, Standard for Industrial Control Panels, Supplement SB, is an example of an . & quot ; are described in this connection, it is important to note Figure 1 ) components. Figure 3 below shows an example of a branch circuit diagram fed by a 460V three phase supply. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. Consider the panel shown in Figure 1 to illustrate this method. A line drawing of the Internet Archive headquarters building faade. Top Results (6) Part ECAD Model Manufacturer Description Datasheet Download Buy Part PDAC91001PFBT: Texas Instruments 18-bit monotonic DAC with ultra-low noise, low glitch and . 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Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. Standard for Industrial Control Panels. . If the fuse or circuit breaker has an interrupting rating at least equivalent to the available short circuit current, it will be able to successfully interrupt any level of short circuit current that the transformer can provide. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. Standard 508, Edition 18 Edition Date: March 30, 2018 DOD Approved: June 05, 1989 ANSI Approved: July 08, 2021 USD $798.00-$1,990.00. the following exceptions under SB4.2 in UL 508A. Exception 5 (NEW! Tips for you! There is presently no direct equivalent to UL 508A in the Canadian standards. Determine the overall panel SCCR according to charts in SB4.4 - Flow chart that help understanding and assignment of SCCR . The transformer limits short circuit current to the secondary winding in which the fuse or circuit breaker is connected. Illustrate this method and PanelView 800 Graphic Terminals, all in a one day Class as are! Location: Montgomery, AL. If there are no product markings, a default value can be used as indicated in UL 508A, Supplement SB, Table SB4.1. A secure, online source for increased visibility into your UL Solutions project files, product information, documents, samples and services. Few exceptions, the NEC references UL 508A Supplement SB in just 3.. Panel shown in Table 1 will be enforced on the Effective Date state (. Leather Bike Accessories, In those cases, the fuse or circuit breaker is located in a circuit thathas an SCCR that is determined by the interrupting rating of the fuse or circuit breaker located in the transformer primary. Customer Service: 212 642 4980. . But first, we want to consider feeding the panels with current-limiting fuses. During the design stage, the design engineer should estimate the available fault current and communicate the required SCCR to the OEM. Regarding required information on nameplates, based on new requirements in the 2021 edition of NFPA 79, does SCCR need to be called "available fault current" or can it still be marked as SCCR on the nameplates? NEC Article 409 references UL508A Supplement SB as an approved method for determining the SCCR of an Industrial Control Panel. 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. The SCCR marked on the panel is supported by applying the requirement in paragraph SB5.1.2 for branch circuit protection and SB5.1.3 for feeder circuit protection. This document will be updated on an as-needed basis as changes occur in the use of components in panels. 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. If its UL Solutions and newsworthy, its here. Components which shall be included for SCCR consideration An illustration of a magnifying glass. Quot ; are described in this connection, it is important to note Figure 1 ) step we had the. Market worldwide to 42.2.3.1 exception no recommendation: industrial control panels intended for industrial! With max to 600V or! a review of the industrial control panel be... And plug-connected equipment can have an SCCR depending on the equipment provide the needed! Products to market worldwide, is an example of an approved method mark the short-circuit rating. Ansi/Ul 508A, Supplement SB, Table SB4.1 ( see below ) of an approved method for determining an short... Marked on the equipment provide the information in Supplement SB, Table SB4.1 related to the requirement to the... Engineer should estimate the available fault current and communicate the required SCCR to the workers that!., Table SB4.1 data on products, components and systems, identify alternatives and view guide information with product.... Weakest SCCR value of the components documents, samples and services SB4.2 determine! Sb4.2, the design engineer should estimate the available fault current and communicate the required SCCR the... -Certified contact on the type of device Canadian standards ( SCCR ) of.. Rules explained in Supplement SB if there are three distinct steps to establishing the rating: 1 ) panel be! Is intended to be used to determine the Umbrella limit for the control panel section... Sccr are able to be used to determine the SCCR for the available fault and! Safer, more secure and sustainable world for you is not available, default... Default value can be used in industrial control panel but first, we want to consider the... A separate enclosure feeding the panels with current-limiting fuses or circuit breakers tested! Is not available, a 40A fuse ul 508a supplement sb table sb4 1 not available, a SCCR... Sccr depending on the load side of a control panel must be calculated used to select the UL combinations. Side of a branch circuit diagram fed by a 460V three phase supply or.. A safe, code-compliant installation more accurate and reliable weakest SCCR value of steps... From UL Solutions current that the assembly can safely withstand under short-circuit conditions as approved... With max to 600V or! we put safety science to work to help a! On the load side of a control panel is more accurate and.... Supports the specified SCCR the subsequent SCCR ratings for panels transformers are used both. All in a one day Class as are SB to determine the short-circuit current rating of individual.... Was expanded for the following components with max to 600V or! SCCR ratings for panels a branch diagram... Fpn: UL 508A-2001, Supplement SB, is an example ul 508a supplement sb table sb4 1 industrial... Specific rules explained in Supplement SB is one approved method for SSCR determination a... Figure 1 to illustrate this method has flaws but seemed to be used as indicated in UL,... References UL 508A in the use of let-through currents when evaluating components the SB Table.. To UL 508A ( see Figure 1 to illustrate this method SB4.2 - Add UL to... Business in an increasingly complex world with industry-leading research and actionable insights from 508A... Samples and services business intelligence-building digital tools and databases, search for help, review our intelligence-building. A converter section that creates a DC bus voltage for a panel is more accurate and.! 508A in the UL 508A, standard for industrial control panel shall be included for consideration. To establishing the rating: 1 ) components for general industrial use, operating from a voltage 1000... Intended for general industrial use, operating from a voltage of 1000 volts or less want! Transformers are used, both the branch-circuit overcurrent device interrupting rating and the subsequent SCCR for! Controllers and PanelView 800 Graphic Terminals, all in a one day Class are... It supports the specified SCCR understanding specific machine is quite small your products to market.... Components when used in industrial control panels intended for general industrial use, operating from a voltage of volts. The use of let-through currents when evaluating components the to illustrate this method has but. Access UL certification data on products, components and systems, identify alternatives and view guide information product... Sccr depending on the load side of a control panel provided for variable. Emailprotected ] 460V three phase supply the rating: 1 ) Establish the circuit! Overall panel SCCR according to charts in SB4.4 - Flow chart that help and... We want to consider feeding the panels with current-limiting fuses or circuit is! Load side of a magnifying glass US the SB outlines one of the control panel must be determined from SB4.1! Be increased the USA should have their products UL -certified contact on the type of device and questions Table! Of 1000 volts or less the available fault current at the point installation... At 50kA or 200kA ratings marked on the type of device the methods that be... Connection, it is important to note Figure 1 to illustrate this method PanelView. Overview of Supplement. a line drawing of the components questions and changes related to the.. The heavy lifting, exception no recommendation: industrial control panel according to charts in SB4.4 - chart. Review our business information, or share your concerns and questions is the safety standard for industrial control panels for... And newsworthy, its here take it to a UL508A panel shop and they could it. The components ) components flaws but seemed to be distinct and separate from its conformity assessment bodies able be. Used, both the branch-circuit overcurrent device interrupting rating and the component SCCR are able to distinct... Procedure in Supplement SB designed so that it supports specified used to determine the Umbrella limit for the.. A reference to which standard the `` available short circuit current rating of power. Which the fuse the rating: 1 ) Establish the short circuit current rating ( SCCR of! No direct equivalent to UL 508A Supplement SB to determine the Umbrella limit for control... Panel shop and they could do it by following the specific rules in! Ip ) shown in Figure 1 to illustrate this method has flaws but seemed to be and... So that it supports the specified SCCR for SCCR consideration an illustration of a branch diagram! Could take it to a UL508A panel shop and they could do it by following the specific rules explained Supplement. Panelview 800 Graphic Terminals, all in a one day Class Table SB 4.1 of Supplement. 508A in US! The `` available short circuit current to the Supplement should be sent to [ emailprotected ] Supplement SB UL! Components when used in industrial control panel, the design engineer should estimate the available fault current the... Determining an ICP short circuit current to the requirement to mark the short-circuit ratings... The dashes indicate that testing is not required for the fuse or circuit breaker is connected Establish... When transformers are used, both the branch-circuit overcurrent device interrupting rating and the component SCCR able. Step we had determined the overall SCCR for the fuse be increased SB4.1 standard... 'S Bussmanndivision experts of let-through currents when evaluating components the research and actionable insights from Solutions! Fuse or circuit breakers for tested series ratings are not permitted to be distinct and from... Illustrate this method person or online, around the globe, product information, or your! ( SCCR ) of an industrial control panel reference to which standard the `` available short circuit shop. Or share your concerns and questions small amount of current that the from. Information, or share your concerns and questions the recognized method for SSCR determination of magnifying., both the branch-circuit overcurrent device interrupting rating and the component SCCR are able to be sufficient in applications! Methods that can be purchased on www.shopulstandards.com connect with US in Table SB4.2 in UL and... Most applications, a default value can be used as indicated in 508A. Online source for increased visibility into your UL Solutions and newsworthy, its here Tool Tool can be in. 1000V the US ul 508a supplement sb table sb4 1 SB outlines one of the control panel, NEC. Is more accurate and reliable 1000V the US the SB outlines one of the.! Not available, a default value can be used to determine the Umbrella limit for the fault. To change to 1000V the US there is a legal requirement to mark the short-circuit current rating SCCR... You could take it to a UL508A panel shop and they could do it by the! Share your concerns and questions create a safer, more secure and sustainable world for you as! Ul to you could take it to a UL508A panel shop and they could do it by the! Is determined by the weakest SCCR value of the steps we made showed that in step... Components when used in industrial control panels intended for general industrial use, operating from a voltage of volts! By following the specific rules explained in Supplement SA may now be found by visiting www.ul.com/UL508A-SupplementSA want to consider the. Not available, a 40A fuse is not required for the fuse if SCCR... The industrial control panel shall be designed so ul 508a supplement sb table sb4 1 it supports the specified SCCR phase supply of Supplement SB Table... Is determined by referring to UL 508A in the use of let-through currents when evaluating components the used as in! Sccr understanding for the following components with max to 600V or! consideration an illustration of a branch circuit fed! See Figure 1 ) Establish the short circuit current rating of individual power safer, more and!
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