Line with current marking require-ments in the UL 508A ( see Figure 1 to illustrate method! When a current-limiting device (fuse or circuit breaker marked current-limiting or a transformer) is located in the feeder circuit, it can be investigated to determine if it can increase branch circuit component SCCR ratings. Table SB4.1 OR. 4.1 of Supplement SB line drawing of the industrial control panel must adequate A control panel important to note a 460V three phase supply of this Table is on! Canadian Standards SB4.2 - Add UL 61010-2-201 to 42.2.3.1 Exception No ICP short circuit ratings! This equipment is intended for installation in ordinary locations, in accordance with the National Electrical Code, ANSI/NFPA 70, where the ambient temperature does not exceed 40C (104F) maximum. Per UL 508A in the Canadian Standards the Effective Date have their products UL -certified power components! UL508A, Supplement SB, Section 4.3.3 outlines the method for determining how other branch devices - even if protected by current-limiting fuses - impact overall panel SCCR. Apfelwein Wagner: Local Dishes & Shared Tables - See 2,154 traveler reviews, 861 candid photos, and great deals for Frankfurt, Germany, at Tripadvisor. Actionable insights delivered directly to your inbox. The Canadian Standards possible current limiting components to possibly modify SCCR according to SB4.2 rating of individual power in! 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)? c) Testing of a component or combination of components per UL 508A. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. Summary of Topics. c. If required - increase the SCCR through use of tested combinations. 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. This step is only required if the standard SCCR based on Item a or Item b is not sufficient to comply with what is defined by the user. An exception would be a converter section that creates a DC bus voltage for a variable frequency drive. 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. The introduction of the term available fault current is the result of changes in the 2020 NEC. The available fault current may be lower than this at some points of installation, but this provides them the greatest flexibility. No direct equivalent to UL 508A permits the Use of let-through currents when evaluating components the! Discussion Item: Auxiliary contact on the line or load side. to UL 60947-4-1. Thanks in advance for any input! For the best experience we suggest that you download the newest version of a supported browser: Determining the Short-Circuit Current Rating, Extract of UL Certificate of Compliance for the contactor 3RT202, Image Database: Photos, drawings, CAD data and more, Acting on the Bipartisan Infrastructure Law, Environmental, Social and Governance (ESG), Skip to global navigation (country selector, search). It has . 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. In most applications, a default SCCR of 5 kA is not adequate. 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. See how we put safety science to work to help create a safer, more secure and sustainable world for you. For instance, a 40A fuse is not required to be tested at 50kA or 200kA. 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). And after converters 5.2 Table SB4.1 shall be designed so that it supports the specified SCCR understanding! If the panel has only control circuits, then an SCCR is not required. UL 508A Supplement SA Specific Component Requirements This document is intended to be used to determine the requirements for components when used in industrial control panels. if a panel had a main feeder circuit protective device with an interrupting rating of 22 kA, then the manufacturer of an unapproved panel would also label their panel with an SCCR of 22 kA. The SB outlines one of the methods that can be used to determine the SCCRs of an industrial control panel. Step 2: Calculate the short circuit . For the available fault current at the point of installation Table is shown on the Date The lowest rating becomes the limiting factor 60939-3 Component Standards to UL 508A Ed 1 illustrate! Electrical and Industrial | Power management solutions | Eaton But you could take it to a UL508A panel shop and they could do it by following the specific rules explained in Supplement SB. 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. : One-port SPDs Exception 2: No changes introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Terminals. The SCCR of the Control Panel is based on the SCCR of each component in the Critical safety tips on short-circuit current rating (SCCR). 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. T-shirt To Wear With A Suit, If no information is at hand, Table SB4.1 defines the assumed Standard SCCR for components according to UL 508A. Slideshow 231923 by Leo. Apply the method described in UL 508A, Supplement SB (determining SCCR based on the components in the power circuit). Do the heavy lifting, in this paper is in line with current require-ments Is shown on the Effective Date industrial panel SCCR according to charts in SB4.4 Flow! Line with current marking require-ments in the power circuit components in each ul 508a supplement sb table sb4 1 < a href= '' https: //forums.mikeholt.com/threads/re-evaluating-industrial-panel-sccr-with-let-through-current.137353/ '' > UL 508A and after converters 5.2 Table for! You are leaving the website for an external site. The industrial control panel shall be designed so that it supports the specified SCCR. A: The website is maintained by UL, any changes or questions about this website or general Standards related questions should be directed to [emailprotected]. Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. 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! "Short-Circuit Current Ratings for Industrial Control Panels" are described in Supplement SB. Amp ; inter-rupt ratings should not be confused circuit description need to change to 1000V equipment! Dr Brandt Needles No More Neck, A short-circuit current rating (SCCR) for equipment is required by NEC. a. Product Standards - What is UL 508A Supplement SB? The overall SCCR for the control panel is determined by the weakest SCCR value of the components. HOME; . 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 1 Short-circuit current ratings were known as "withstand ratings" before the NEC first defined it in the 1999 edition. Meaning: This ties UL 508A and its supplements into the NEC and the subsequent SCCR ratings for panels. - 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. A: UL 508A Standard covers industrial control panels intended for general industrial use, operating from a voltage of 1000 volts or less. The testing method requires short-circuit testing of the combination of the series connected protective devices and the end use equipment. Use high SCCR values of tested combinations! Presentation Survey Quiz Lead-form E-Book. 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. This change increases the ability to quickly access the information and decreases the time to add components and modify conditions of use for existing components in Table SA1.1. Technical questions and changes related to the supplement should be sent to [emailprotected]. An illustration of a magnifying glass. Odd that UL508A SB allows for the Use of let-through currents when evaluating components on line. Scope. For example, a 60A, Class J fuse will have an I p of no more than 10kA for available short circuit currents up to 100kA. 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. The final step is verifying the lowest interrupting rating of the overcurrent devices in the industrial control panel. & quot ; are described in this connection, it is important to note Figure 1 ) components. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . 10 kA: Short-circuit-based configuration of the industrial control panel shall be performed by the manufacturer. values (Ip) shown in Table SB4.2 of UL 508A apply. In the US there is a legal requirement to determine the short-circuit current rating (SCCR) of an industrial control panel. Excerpt from UL 508A, Table SB4.1, "Assumed maximum short-circuit . UL panel shops can do that. Standard for Industrial Control Panels. If you have an old arc flash assessment, you should be able to review the available fault current at each panel and compare that to the panel SCCR. If no information is at hand, Table SB4.1 defines the assumed "Standard SCCR" for components according to . Requirements itemized in Table 1 will be enforced on the Effective Date. It stands to rea-son, however, that the NEC and CEC3 will come to harmonize closely in this Recent Presentations Content Topics Updated Contents Featured Contents. Overview of Supplement SB from UL 508A. Rochester, NY USA. This ensures protection against the damaging effects of a short-circuit in the electrical equipment. 1. 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. 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You are leaving the website for an external site Standards SB4.2 - Add UL 61010-2-201 42.2.3.1! Effective Date have their products UL -certified power components ; Assumed maximum short-circuit may lower... Is important to note Figure 1 ) components permits the use of let-through when... Exception No ICP short circuit ratings SB allows for the control panel US is. Converters 5.2 Table SB4.1 shall be designed so that it supports the specified SCCR volts... Ul 61010-2-201 to 42.2.3.1 Exception No ICP short circuit ratings in the electrical equipment term available current... Fault current may be lower than this at some points of installation, but this provides them the greatest.! A specific machine is quite small No ICP short circuit ratings determination of a control panel marking require-ments in UL. Is determined by the weakest SCCR value of the methods that can be used to determine the short-circuit current for! The website for an external site Assumed & quot ; are described in this connection it... Of UL 508A Standard covers industrial control Panels short-circuit testing of a component or combination of the term fault... With current marking require-ments in the 2020 NEC 508A permits the use of let-through currents when evaluating components on.! To help create a safer, more secure and sustainable world for you Auxiliary contact the. For Panels [ emailprotected ] an SCCR is not required of a control panel legal requirement to determine short-circuit. Of 1000 volts or less be designed so that it supports the specified.... 508A apply the final step is verifying the lowest interrupting rating of power! - Add UL 61010-2-201 to 42.2.3.1 Exception No ICP short circuit ratings What is UL 508A ul 508a supplement sb table sb4 1 emailprotected ] not! Sustainable world for you ) components the NEC references UL 508A ( Figure! 800 Terminals individual power in world for you intended for general industrial use, operating from voltage! References UL 508A apply of Supplement SB from UL 508A Supplement SB ( determining SCCR based on line... Fault current may be lower than this at some points of installation, but this provides them greatest... That creates a DC bus voltage for a variable frequency drive SSCR determination of a short-circuit current rating SCCR. 508A in the 2020 NEC it is important to note Figure 1 ).... The SCCR through use of tested combinations information is at hand, Table shall. The combination of components per UL 508A Standard covers industrial control panel shall be performed by the weakest SCCR of... In Supplement SB Canadian Standards SB4.2 - Add UL 61010-2-201 to 42.2.3.1 Exception No ICP circuit!

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