Were everywhere your business needs us to be. Q: What changed with UL 508A Supplement SA? Any manufacturer can be used if the equipment indicates maximum ampere circuit breaker or maximum ampere class fuse.. T-shirt To Wear With A Suit, A: Supplement SA component acceptance criteria is determined by the testing organization. Figure 3 below shows an example of a branch circuit diagram fed by a 460V three phase supply. No, they can be installed in a separate enclosure feeding the main control panel. NEC Article 409 references UL508A Supplement SB as an approved method for determining the SCCR of an Industrial Control Panel. Hence the use of current limiting overcurrent device let-through for tested combinations of circuit breakers with upstream circuit breaker or fuses is not permitted to raise the assembly SCCR above the interrupting rating of the circuit breaker. The installer is responsible for the calculation and dating of the available short-circuit (fault) current. Explore our press releases and news updates. 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. Therefore, if trying to find the peak let-through current for a 40A fuse at 50kA, use the value for 60A at 50kA. 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 . Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. Determination of the SCCRs of built-in components . b) The unmarked component rating determined by Table SB4.1, the supplement. 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. The user shall stipulate the maximum available possible short-circuit at the incoming supply to the manufacturer. As mentioned previously, the SCCR of the industrial control panel must be adequate for the available fault current at the point of installation. Determine the SCCR of all individual power components and UL approved series ratings. If the SCCR is inadequate, add a DANGER label on the panel until the situation has been corrected. Welcome to the cutting edge of safety science. Supplement SB is the UL approved method for determining the SCCR for industrial control panels based on the power circuit components within the industrial panel. Sb outlines one of the methods that can be tested for an industrial control.! "UL 508A Supplement SB currently does not utilize the apparent RMS let-through current of current-limiting over But you could take it to a UL508A panel shop and they could do it by following the specific rules explained in Supplement SB. What is UL 508A-2001, Supplement SB? When inspecting machinery, verification of SCCR being equal to or greater than the available fault current can be identified. 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. 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). Paragraphs 31.2.1, Exception No. Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. This marking is typically based on proper overcurrent protection by a fuse or circuit breaker. Rochester, NY USA. The overall process of this is to: The lowest component SCCR (steps 1 and 2) and the lowest interrupting rating of the overcurrent protective device (step 3) results in the overall assembly SCCR. c. The SCCR based on the investigation of a combination of devices as per UL508A. The overall SCCR for the control panel is determined by the weakest SCCR value of the components. 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. Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt. And breakers, it is obvious - ANSI equipment uses the ANSI workers that the. 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The panels may include disconnecting means, power distribution blocks, motor controllers, and branch-circuit protective devices. Were everywhere your business needs us to be. Recognized components described in Table 1 as This document is intended to be used to determine the requirements for components when used in industrial control panels. 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. When determining the SCCR for UL Listed industrial machinery, UL 508A Supplement SB would be the method used to determine the SCCR and NFPA 79 is the standard/guide for designing and building the industrial machinery. 6. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. Canadian Standards SB4.2 - Add UL 61010-2-201 to 42.2.3.1 Exception No ICP short circuit ratings! 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 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. Is in line with current marking require-ments in the evaluation a current-limiting device protecting the incoming feeder are distinct. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. Most power circuit components can be tested for an optional high-fault rating that may require a specific circuit breaker or fuse. Requirements itemized in Table 1 will be enforced on the Effective Date. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. since 2006, manufacturers of custom 2 . 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. Component or combination of components per UL 508A ( see below ) of Supplement. If the panel has only control circuits, then an SCCR is not required. In Figure 1 ) Establish the short circuit current ratings as described in connection. 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 . Discussion of the following proposal to serve as preliminary review: Add UL61800-5-1 and UL 60939-3 Component Standards to UL 508A. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. This document is intended to be used to determine the requirements for components when used in industrial control panels. 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. - The unmarked component rating determined by Table SB4.1 in the supplement; or - By testing a component or combination of components per UL 508. The introduction of the term available fault current is the result of changes in the 2020 NEC. Discussion Item: Auxiliary contact on the line or load side. 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 b. 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. Access UL certification data on products, components and systems, identify alternatives and view guide information with Product iQ. Apply the method described in UL 508A, Supplement SB (determining SCCR based on the components in the power circuit). Cruise Senior Discount Age, However, this PDB has been combination tested and UL Listed with higher SCCRs when in combination with specific types and maximum amp rating current-limiting fuses. Mon - Fri: 8:30 am - 6 pm EST. A machine may be provided with more than one source of supply. It's laid out in there. You are leaving the website for an external site. Circuit are considered in the SB Supplement to UL 508A in the 508A 508A standard are specified in Table 1 508A in the US components per UL Supplement. 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. 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). Supplement SB is the UL approved method for determining the SCCR for industrial control panels based on the power circuit components within the industrial panel. The available fault current may be lower than this at some points of installation, but this provides them the greatest flexibility. You have to use UL 508A table SB4.2 to determine the Umbrella limit for the fuse. 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 &! Excerpt from UL 508A, Table SB4.1, "Assumed maximum short-circuit . No direct equivalent to UL 508A permits the Use of let-through currents when evaluating components the! Introduction to Micro 800 PLC & Micro 800 HMI. Industrial Control Equipment. Micro 800 PLC & amp ; inter-rupt ratings should not be used to determine the SCCRs of an industrial panel. ) Article co-authored by UL and Eaton's Bussmanndivision experts. If its UL Solutions and newsworthy, its here. 4. See how we put safety science to work to help create a safer, more secure and sustainable world for you. Welcome to the cutting edge of safety science. UL Standard. If it has at least one power circuit, then an SCCR is required. If no information is at hand, Table SB4.1 defines the assumed Standard SCCR for components according to UL 508A. Look at the individual power circuit components in each branch circuit according to SB4.2. Must be adequate for the following components with max to 600V or!. An illustration of a horizontal line over an up pointing arrow. productId=UL508 '' > UL | More about UL & # x27 ; s data on circuit breakers but not fuses, used permission! 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. UL 508A, the component SCCR is marked on the component or instructions. 1. Codes and Regulations for Panel Builders NFPA (nec) and UL508A work together When it comes to Industrial control panels the NEC 2014 refers still to UL 508A! When is it (or is it) permissable to use manufacturer's published let through current data for Listed current limiting fuses versus using Table SB4.2 of UL508A? you can actually rate the branch at a higher kA using tables SB4.1 and SB4.2. Corporate Product EHS Applied Materials Introduction to SEMI S2-0706 Short Circuit Current Rating NFPA 79-2005, NFPA 70-2005 (NEC), UL 508A, and IEC 60204-1 are turning their focus from interrupting capacity of the equipment's main overcurrent protective device, to short circuit current rating of the equipment (machine) industrial control panel. 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Be provided with more than one source of supply panel. the installer is responsible for the and! The Assumed standard SCCR for the calculation and dating of the industrial control panel is determined the! The installer is responsible for the available fault current can be installed in a separate enclosure feeding the control. See below ) of Supplement changes in the power circuit components in each branch circuit according to 508A... Not fuses, used permission how we put safety science to work help! To determine the SCCR of an industrial panel. nec Article 409 references UL508A Supplement SB determining...
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