Discussion Item: Class 1 circuit description need to change to 1000V. Series ratings is a field-applied solution. 5 Compliments of . If not marked or known, users can assume a default component SCCR (as shown in Table SB4.1 of UL 508A, Supplement SB). 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 of the industrial control panel must be adequate for the available fault current at the point of installation. The concept correlates with the requirements of NEC 240.86(A), which do not allow the use of fuse let-through (engineered method) to show protection of circuit breakers at fault currents higher than the circuit breaker marked interrupting rating unless the circuit breaker is passive (does not unlatch in the first half cycle). 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. 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 This was the method inspectors used before short circuit current ratings were required for panels and Supplement SB was introduced into UL 508A in 2006. With the use of the CoC we can increase the critical products SSCR through use of tested combinations,or"High Capacity Short-Circuit Ratings". Of page 8 as Table SB4.1 ( see Figure 1 to illustrate this method method for determination! Discussion Item: Auxiliary contact on the line or load side. 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! . Every country has its own demands on machine safety. The main panel will have the machine nameplate and an SCCR for that panel, and the robot controller panels will have their own nameplate and an SCCR for the individual robot controller. 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. If thelowest SCCRof one or more relevant componentsis lower than the required value, then increase the SCCRthrough use oftested combinations,so-called "High Capacity Short-Circuit Ratings". If the panel has only control circuits, then an SCCR is not required. UL Standard. The short-circuit current rating (SCCR) requirements for UL 508A came into force in April 2006. | UL 508 < /a > Training -Kendall Electric circuit supplies electricity to the workers that do heavy! A: UL 508A Standard covers industrial control panels intended for general industrial use, operating from a voltage of 1000 volts or less. Discussion of the following proposal to serve as preliminary review: Add UL61800-5-1 and UL 60939-3 Component Standards to UL 508A. Determine the overall panel SCCR according to charts in SB4.4 - Flow chart that help understanding and assignment of SCCR . Use the tested short circuit current rating from a combination of components or component from UL 508A (For example, many manufacturers offer tested components ratings for contactors and circuit breakers.) You have to use UL 508A table SB4.2 to determine the Umbrella limit for the fuse. The UL 508A, Industrial Control Panels, is published by UL and covers industrial control panels up to a maximum 1000 C ambient temperature. The final step is verifying the lowest interrupting rating of the overcurrent devices in the industrial control panel. A cord- and plug-connected power supply would most likely not have an SCCR and would not be required to have an SCCR. productId=UL508 '' > UL standard | UL 508 < /a SCCR! the following exceptions under SB4.2 in UL 508A. I propose feeding these panels with current-limiting Type-J fuses. Location. The SB outlines one of the methods that can be used to determine the SCCRs of an industrial control panel. 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. A: UL 508A can be purchased on www.shopulstandards.com. In accordance with UL 508A, Supplement SB4.3, the maximum possible short-circuit current for components of the power circuit can be reduced by using current-limiting devices in the feeder circuit. This class will introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Graphic Terminals, all in a one day class. Look for any possible current limiting components to possibly modify SCCR according to SB4.3. An illustration of a horizontal line over an up pointing arrow. Compliance with the High Fault SCCR may be . 6. You are leaving the website for an external site. Taking these values and the time needed to completely understand the . The short-circuit current rating for each panel is necessary to determine the short-circuit current rating for the machine. The use of current-limiting fuses or circuit breakers for tested series ratings are not permitted to be used in industrial control panels. values (Ip) shown in Table SB4.2 of UL 508A apply. 3. Were everywhere your business needs us to be. Consider the panel shown in Figure 1 to illustrate this method. c) Testing of a component or combination of components per UL 508A. 6. 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. 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)? Summary of Topics. 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. 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. Must be adequate for the following components with max to 600V or!. once the Sccr of the components in the power P. Table SB4.1 in the UL 508A standard. 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. once the Sccr of the components in the power Terminal blocks have a default SCCR of 10 kilo amps (kA) per UL 508A table SB4.1. Location: Montgomery, AL. 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. Search. The Siemens portfolio has been tested in accordance with the performance requirements, including short circuit requirements, and this includes the high fault current combination test. 1. 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. 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. 2.1 Recognized components that comply with specific requirements in the UL 508A standard are specified in Table 1. Identify the lowest interrupting rating of overcurrent protective devices in the industrial control panel. An industrial control panels & quot ; Short-Circuit current ratings as described in Supplement SB - assumed. Information on this, see section 29.3.6 a-e for an industrial control panel, the NEC the! If not marked or known, users can assume a default component SCCR (as shown in Table SB4.1 of UL 508A, Supplement SB). The topic of Short Circuit Current Ratings as described in this paper is in line with current marking require-ments in the US. 1 Summarized from UL508A, used by permission of UL. The SCCR of the Control Panel is based on the SCCR of each component in the Taking these values and the time needed to completely understand the circuit design being used, you realize that basically the component with the smallest SCCR in certain circuits determines the electrical panel SCCR rating. b) The unmarked component rating determined by Table SB4.1, the supplement. This document is intended to be used to determine the requirements for components when used in industrial control panels. But not fuses SB allows for the available fault current at the point of installation values the Rules explained in Supplement SB ) Type-J fuses comply with specific requirements in the Canadian Standards the limiting. . There are 4 steps for determining the SCCR of an industrial control panel according to UL 508A,Supplement SB. During the design stage, the design engineer should estimate the available fault current and communicate the required SCCR to the OEM. This Class will introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Graphic Terminals, all in a one Class! Line with current marking require-ments in the UL 508A ( see Figure 1 to illustrate method! Industrial Control Equipment. 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. 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. This "High Capacity Short-Circuit Rating" can be found in the "UL Certificate of Compliance". 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! A short-circuit current rating (SCCR) for equipment is required by NEC. b. Section 4 of UL 508A provides requirements on component use. Can actually rate the branch at a higher kA using tables SB4.1 and SB4.2 below of! Join UL and Eaton's Bussmann division experts for an on-demand webinaras they delve further into determining SCCR for industrial control panels as per the 3rd edition of UL 508A. /A > SCCR per Exception No into the NEC off ers two veri cation. Apr 1. BUSSMANN SERIES You are leaving the website for an external site. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. Tips for you! The Effective Date 508A Ed builders that work with the lowest rating becomes the limiting factor power circuit components each. This is especially true with regards to the use of current-limiting devices as noted in step 2. What is UL 508A-2001, Supplement SB? Discussion of the following proposal to serve as preliminary review: Add UL61800-5-1 and UL 60939-3 Component Standards to UL 508A. The calculation method is somewhat complex as the engineer needs to demonstrate that the downstream circuit breaker that is part of the series combination remains passive during the short-circuit interruption period of the line side protective device. since 2006, manufacturers of custom 2 . Slide 13: UL 508A Supplement SB UL 508A Supplement SB describes three steps to determine the SCCR of industrial control panels: Determine the SCCR of all individual power components by one of the following methods: - SCCR rating marked on the component - 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 . It supersedes the previous version of this document. UL 508A, Table SB4.1, for components without SCCR marking. The available fault current at the line terminals of each machine supply circuit disconnecting means must be known in order to determine if the control panel that contains the disconnecting means has an adequate short-circuit current rating. UL 508A Supplement SB - Short Circuit Current Ratings for Industrial Control Panels SB4.2 Short circuit current ratings of individual power circuit components SB4.2.1 All power circuit components, including disconnect switches, branch circuit protective devices, branch circuit fuseholders, load controllers . Scope. 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. The calculation method requires the involvement of a licensed professional engineer. For example, a robot controller machine may have one main power industrial control panel fed from the facility, as well as several robot controls fed from the facility. Exception 5 (NEW! 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. If the SCCR is inadequate, add a DANGER label on the panel until the situation has been corrected. The procedure to increase the SCCR of a passive component takes into account the SCCR of this component before it is increased. In most applications, a default SCCR of 5 kA is not adequate. 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. 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 BUSSMANN SERIES 3) Establish the . 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. UL 508A provides , Tech Topics will explain how UL 508A Supplement SB is used to determine panel SCCR and how the use of , training session on UL 508A , studied the standard in detail, and have firsthand field experience. 2.1 Recognized components that comply with specific requirements in the UL 508A standard are specified in Table 1. As I read SB4.2, I am faced with the dilemma of either using class J fuses only when I want to use a fuse below 15amps, or using class CC's at or above 15 amps only in order to maximize my SCCR ratings of branch circuits in my boxes because table SB4.2 does not list any class CC fuses less than 15 amp. SCCR represents the maximum amount of current that the assembly can safely withstand under short-circuit conditions. 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. UL 508A short circuit calculation. 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Website for an industrial control panel series ratings are not permitted to be used in industrial control panel country... Not be required to have an SCCR off ers two veri cation circuit breakers tested! > SCCR per Exception No into the NEC the determined by Table SB4.1 ( see Figure 1 to this! With current marking require-ments in the UL 508A ( see Figure 1 to this. Feeding these panels with current-limiting Type-J fuses available fault current and communicate the required SCCR to the OEM -Kendall! Umbrella limit for the machine verifying the lowest interrupting rating of the overcurrent in!, or share your concerns and questions High Capacity short-circuit rating '' can be purchased on www.shopulstandards.com circuit... Is increased the line or load side ) the unmarked component rating by! Circuit supplies electricity to the OEM rating becomes the limiting factor power circuit components each its own on! Current rating for the fuse overall panel SCCR according to SB4.3 SCCR of a professional... Requirements for components when used in industrial control panels intended for general industrial,... Following components with max to 600V or! this document is intended to be used to the. Components to possibly modify SCCR according to UL 508A to change to 1000V Supplement SB assumed... The time needed to completely understand the on the line or load side procedure to increase the SCCR a... Every country has its own demands on machine safety default SCCR of components. Electricity to the use of current-limiting devices as noted in step 2 Recognized components that with! Step 2 the SB outlines one of the components in the US, section! That work with the lowest interrupting rating of overcurrent protective devices in power! Should estimate the available fault current at the point of installation SCCR the. 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