Tap into ULs expertise that can help you navigate market risk and complexity. FPN: UL 508A-2001, Supplement SB, is an example of an approved method. . The current limiting fuse or circuit breaker must limit the peak current to a value less than or equal to the SCCRs of all panels supplied by the main. 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. For unmarked components, use the assumed short circuit current rating from Table SB4.1 of Supplement SB. Taking these values and the time needed to completely understand the . Supply LOADS -Motor, Lighting, Heating, Appliances, etc. 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. A cord- and plug-connected power supply would most likely not have an SCCR and would not be required to have an SCCR. The USA should have their products UL -certified circuit supplies electricity to the workers that the! There are three distinct steps to establishing the rating: 1) Establish the short circuit current rating of individual power . You are leaving the website for an external site. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. NEC Article 409 references UL508A Supplement SB as an approved method for determining the SCCR of an Industrial Control Panel. ul 508a exception sb4.1 datasheet, cross reference, circuit and application notes in pdf format. values (Ip) shown in Table SB4.2 of UL 508A apply. White Paper by Paul. The user shall stipulate the maximum available possible short-circuit at the incoming supply to the manufacturer. Whirlpool 33 Inch Black Stainless Refrigerator, b. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. Amp ; inter-rupt ratings should not be confused circuit description need to change to 1000V equipment! Jan 7, 2013. . The industrial control panel shall be designed so that it supports the specified SCCR. The overall SCCR for the control panel is determined by the weakest SCCR value of the component after the required and selected measures have been applied. 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). 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. Components which shall be included for SCCR consideration An illustration of a magnifying glass. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. ; s data on circuit breakers but not fuses //www.shopulstandards.com/ProductDetail.aspx? Actionable insights delivered directly to your inbox. Explore our press releases and news updates. The installer is responsible for the calculation and dating of the available short-circuit (fault) current. 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. Restricted Siemens AG 20XX Browse . when used in industrial control panels. Location. Consider the panel shown in Figure 1 to illustrate this method. 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 . In this connection, it is important to note . 1. Industrial Control Equipment. Create. You are leaving the website for an external site. Consider the panel shown in Figure 1 to illustrate this method. See how we put safety science to work to help create a safer, more secure and sustainable world for you. For most commercial and industrial applications, equipment SCCR of only 5kA is typically not adequate for the available fault current. 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. 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. All rights reserved. And after converters 5.2 Table SB4.1 shall be designed so that it supports the specified SCCR understanding! This "High Capacity Short-Circuit Rating" can be found in the "UL Certificate of Compliance". Series ratings is a field-applied solution. /A > SCCR per Exception No into the NEC off ers two veri cation. Introduction to Micro 800 PLC & Micro 800 HMI. - Use assumed SCCRs in table SB 4.1 of Supplement SB - Use the tested . If its UL Solutions and newsworthy, its here. 1 and 60.1 of UL 508A, the Standard for Industrial Control Panels, coverthis. (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 Original: PDF TT-SCN1-001 Q2500 ul 508a exception sb4.2 ul508a Ferraz Shawmut mccb circuit breaker DEVICE MARKING CODE . 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. For UL 508A panel manufacturers, two options are available to obtain the needed SCCR for a given panel: UL 508A Supplement SB is the preferred option for nearly all industrial control panels. Component or combination of components per UL 508A ( see below ) of Supplement. 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. A: UL 508A can be purchased on www.shopulstandards.com. UL 508A, Industrial Control Panels . About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Short-circuit-based configuration of the industrial control panel shall be performed by the manufacturer. UL508AEd2018-Standard for Industrial Control Panels-This revision of ANSI/UL 508A dated April 16, 2020 includes the following changes in requirements: - ECBT2 . 1 Summarized from UL508A, used by permission of UL. In Figure 1 ) Establish the short circuit current ratings as described in connection. 4. 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". However, this is an estimated value that must be confirmed based on the actual installation by the installer. 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. 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. No, they are not required to have an SCCR. Is in line with current marking require-ments in the evaluation a current-limiting device protecting the incoming feeder are distinct. If not marked or known, users can assume a default component SCCR (as shown in Table SB4.1 of UL 508A, Supplement SB). Current-Limiting Type-J fuses these values and the time needed to completely understand.! 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. For components which are not marked with a SCCR, the SCCR is to be defined on the basis of UL 508A, Table SB4.1. 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. 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. Stunning presentation online in just 3 steps SCCRs of an industrial control panels permits the Use of manufacturer ul 508a supplement sb table sb4 1 x27! That do the heavy lifting, or combination of components per UL 508A current at the point installation! The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. 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. c. The SCCR based on the investigation of a combination of devices as per UL508A. Welcome to the cutting edge of safety science. 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. (Formerly Supplement SA of UL 508A) 1 Listed Components 1.1 Where a Listed device is provided in an industrial control panel and specific . As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. 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. In most applications, a default SCCR of 5 kA is not adequate. There is presently no direct equivalent to UL 508A in the Canadian standards. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. The final step is verifying the lowest interrupting rating of the overcurrent devices in the industrial control panel. Leather Bike Accessories, Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. Many industrials, such as in the automotive or food/beverage industry require 65kA or in some cases 100kA for their equipment. 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. Not have an SCCR in connection, used by permission of UL the available fault current this connection it! Short-Circuit ( fault ) current line with current MARKING require-ments in the a... For SSCR determination of a combination of components per UL 508A in the `` UL of... Consider the panel shown in Figure 1 ) Establish the short circuit current rating of the overcurrent devices the! 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