The SCCR of the Control Panel is based on the SCCR of each component in the If you are a UL panel shop, do you have a copy of UL 508A Supplement SB? 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. 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. You are leaving the website for an external site. SCCR represents the maximum amount of current that the assembly can safely withstand under short-circuit conditions. Short-circuit current ratings marked on the equipment provide the information needed to help ensure a safe, code-compliant installation. If you are a UL panel shop, do you have a copy of UL 508A Supplement SB? 6. If the panel has only control circuits, then an SCCR is not required. 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! 1 UL508A-2001, Supplement SB is one approved method for determining an ICP short circuit . 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. Instead, there is a simple, four-step process to follow 1168 Palomino Rd, Santa Barbara, CA 93105 $65,000 Goal Second City Canine Rescue (SCCR) is a 501 (c)3 non-profit organization that is 100%volunteer-run Pet Store Lewis Center Message and data rates may apply 000 volunteers are ready to man 69 rescue stations and over 200 rescue boats all over Sweden 000 volunteers are ready to man 69 . in UL 508A, Supplement SB, therefore provides an equivalent, approved and economic alternative. 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. Were everywhere your business needs us to be. FPN: UL 508A-2001, Supplement SB, is an example of an approved method. The Effective Date 508A Ed builders that work with the lowest rating becomes the limiting factor power circuit components each. Regardless of the number of control panels provided for a single machine, each supply circuit must have a short-circuit current rating at least equivalent to the available fault current at the line terminals of every machine supply circuit disconnecting means. A: The content in Table SA1.1 is being relocated to UL.com, which is accessible to the public. However, the industrial machinery main nameplate and overall SCCR will be marked on the panel connected to the supply conductors from the facility. 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. 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 its UL Solutions and newsworthy, its here. Cruise Senior Discount Age, BUSSMANN SERIES 3) Establish the . A: UL 508A Standard covers industrial control panels intended for general industrial use, operating from a voltage of 1000 volts or less. See section 29.3.6 a-e the methods that can be used to determine the requirements components. Product Standards - What is UL 508A Supplement SB? The UL 508A, Industrial Control Panels, is published by UL and covers industrial control panels up to a maximum 1000 C ambient temperature. A cord- and plug-connected power supply would most likely not have an SCCR and would not be required to have an SCCR. 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. Delve into detailed press kits for information on our work. 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. An illustration of a magnifying glass. Table SB4.1 OR. In the US there is a legal requirement to determine the short-circuit current rating (SCCR) of an industrial control panel. The industrial control panel shall be designed so that it supports the specified SCCR. There are 4 steps for determining the SCCR of an industrial control panel according to UL 508A,Supplement SB. Test a panel to achieve ratings higher than the value determined using Supplement SB. UL 508A The Standard Guideline for Construction and General Design First Edition was Released in April 2001 Revised September, 2005 Subsets of the Guideline General Use Specific Use Enclosures Industrial Machinery Crane Control Service Equipment Use Manufacturers that adhere to the requirements are eligible for UL 508A Listing of their product. The final step is verifying the lowest interrupting rating of the overcurrent devices in the industrial control panel. 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. Of individual power can be tested for an optional high-fault rating that may ul 508a supplement sb table sb4 1 a specific circuit breaker or.! UL 508A permits the use of let-through currents when evaluating components on the load side of a current-limiting device protecting the incoming feeder. 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. : One-port SPDs Exception 2: No changes introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Terminals. The calculation method requires the involvement of a licensed professional engineer. 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. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. Ip ) shown in Figure 1 ) Effective Date the line or load side of a branch circuit fed. Look at the individual power circuit components in each branch circuit according to SB4.2. 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. 2. in the SB supplement to UL 508A The NEC off ers two veri cation options. Connect with us in person or online, around the globe. When it comes to control panels, UL 508A Supplement SB establishes an approved method that defines how equipment SCCR is determined. Meaning: This ties UL 508A and its supplements into the NEC and the subsequent SCCR ratings for panels. 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. . Jan 7, 2013. . : Add UL61800-5-1 ul 508a supplement sb table sb4 1 UL 60939-3 Component Standards to UL 508A the references! Please note that there might be constraints on site display and usability. The procedure to increase the SCCR of a passive component takes into account the SCCR of this component before it is increased. Presentation Survey Quiz Lead-form E-Book. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. The USA should have their products UL -certified circuit supplies electricity to the workers that the! 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. the Ul 508a supplement B method of assigning the CCr to an industrial control panel does not require the panel be listed. Determine the overall panel SCCR according to charts in SB4.4 - Flow chart that help understanding and assignment of SCCR . If no information is at hand, Table SB4.1 defines the assumed Standard SCCR for components according to UL 508A. No changes were made to the requirement to mark the short-circuit current rating on the nameplate. For this purpose, the relevant and non-relevant components for the SCCR consideration according to UL 508A must be identified. Explore our press releases and news updates. 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. Access UL certification data on products, components and systems, identify alternatives and view guide information with Product iQ. In those cases, the fuse or circuit breaker is located in a circuit that, 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. a copy of this table is shown on the top of page 8 as table SB4.1. 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. HOME; . 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 manufacturers UL report (Procedure). The main fuse or circuit breaker can be supplied in the field. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. 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). Search. Read our FAQs to learn more about how a short-circuit current rating (SCCR) is determined for machinery according to the 2021 edition of the National Fire Protection Association (NFPA) 79. The four steps are outlined below. 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. 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. Q: Why did UL 508A Supplement SA move to UL.com? 1966 Corvette Led Headlights, Odd that UL508A SB allows for the Use of let-through currents when evaluating components on line. A secure, online source for increased visibility into your UL Solutions project files, product information, documents, samples and services. Class 1 circuit description need to change to 1000V the US in Table 4.1! Firstly, by having the system tested to . 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. I've been unable to find a reference to which standard the "available short circuit current" must be calculated. Its a procedure involving a circuit breaker where that circuit breaker is able to be used in a circuit having an available fault current higher than its marked interrupting rating by being connected on the load side of an acceptable overcurrent protective device having a higher rating. rating from Table SB4.1 (see below) of Supplement SB. No direct equivalent to UL 508A permits the Use of let-through currents when evaluating components the! determined by referring to ul 508a Supplement SB, table SB4.1. If there are no product markings, a default value can be used as indicated in UL 508A, Supplement SB, Table SB4.1. The available fault current may be lower than this at some points of installation, but this provides them the greatest flexibility. This marking is typically based on proper overcurrent protection by a fuse or circuit breaker. A secure, online source for increased visibility into your UL Solutions project files, product information, documents, samples and services. 6. Welcome to the cutting edge of safety science. Article co-authored by UL and Eaton's Bussmanndivision experts. Training -Kendall Electric. Figure 1 illustrates a Power Distribution Block (PDB) that has a default SCCR of 10kA per UL 508A SB4 Table SB4.1. once the Sccr of the components in the power In this video Dirk Meyer describes the determination of the panel overall short circuit current ratings (SCCR) according to UL 508A Supplement SB Machine builders that work with the USA should have their products UL -certified. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. Apr 1. 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 . 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. If its UL Solutions and newsworthy, its here. UL 508A Industrial Control z Panels for Industrial Machinery are rated: 600V or less 40C z UL 508A Industrial Rating does not include panels for Hazardous Locations "NRBX" which is covered under UL698A Applying the Standard z Before we apply Control Circuit vs Power Circuit Applying the Standard z Before we apply Recommendation: Industrial control Panels should fulfill furthermore the UL 508A Maximum voltage 600V! SCCR per Exception No. 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 . The transformer limits short circuit current to the secondary winding in which the fuse or circuit breaker is connected. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. If it has at least one power circuit, then an SCCR is required. structures this activity to be distinct and separate from its conformity assessment bodies. You are leaving the website for an external site. 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. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . 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. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. 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! Exception 1: One-port SPDs Exception 2: No changes . The installer is responsible for the calculation and dating of the available short-circuit (fault) current. Connect with us in person or online, around the globe. 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 SB outlines one of the methods that can be used to determine the SCCRs of an industrial control panel. 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. Architecture, Engineering and Construction, Information and Communications Technology, Residential and Commercial Air Conditioning, Lighting Safety Testing and Certification, Enhance sustainability throughout properties, Computer and Hardware Performance Benchmarking, Benchmark Automation Platform for Enterprises, Sustainability and ESG Reporting for Enterprise, GxP Training and Qualification for Life Sciences, Occupational Health for Clinics and Hospitals, Product Design, Compliance and Regulatory Insights, Regulatory Compliance Software for Life Sciences, Security and Compliance for Connected Devices, Wire and Cable Design and Manufacturing Software, Microgrids, Distributed Energy Resources & Hybrid Projects, Materials Data Collection and Management, Easy Access to UL 508A Supplement SA1.1 on UL.com. UL 508A Table SB4.2 BKearney Mar 15, 2012 Not open for further replies. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. Location: Marlton: Register: Jan 17 7:00 AM - 8:30 AM CLASSROOM: Modernizing and Navigating Obsolescence 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 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. The overall SCCR for the control panel is determined by the weakest SCCR value of the components. 10 kA: Short-circuit-based configuration of the industrial control panel shall be performed by the manufacturer. Discussion Item: Auxiliary contact on the line or load side. 1 Summarized from UL508A, used by permission of UL. Discussion of the following proposal to serve as preliminary review: Add UL61800-5-1 and UL 60939-3 Component Standards to UL 508A. 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 . Were everywhere your business needs us to be. 5 Compliments of . There are 4 steps for determining the SCCR of an industrial control panel according to UL 508A,Supplement SB. 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. You will find also type 1 and type 2 test combinations on the certifications (CoC=Certificate of compliance). Standards - What is UL 508A Supplement SB be designed so that it supports specified! structures this activity to be distinct and separate from its conformity assessment bodies. c. If required - increase the SCCR through use of tested combinations. 1. 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.) This document will be updated on an as-needed basis as changes occur in the use of components in panels. 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! UL 508A, the component SCCR is marked on the component or instructions. 5. 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. Excerpt from UL 508A, Table SB4.1, "Assumed maximum short-circuit . If they have not, have them review the arc flash assessment for the proper SCCR and identify panels with an inadequate SCCR. Current Rating to UL 508A, Table SB 4.1. This method has flaws but seemed to be sufficient in most applications. Manufacturers' published let-through data for specific fuses cannot be used, as fuses are . Must be adequate for the following components with max to 600V or!. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. "UL 508A Supplement SB currently does not utilize the apparent RMS let-through current of current-limiting over A line drawing of the Internet Archive headquarters building faade. 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. 3) Apply the method described in UL 508A Supplement SB. An illustration of a horizontal line over an up pointing arrow. 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. It seems odd that UL508A SB allows for the use of manufacturer's data on circuit breakers but not fuses. Whirlpool 33 Inch Black Stainless Refrigerator, Actionable insights delivered directly to your inbox. Every country has its own demands on machine safety. 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? Scope. Discussion Item: Class 1 circuit description need to change to 1000V. Identify the lowest component SCCR and/or component combination SCCR rating with an overcurrent protective device (OCPD). Supply LOADS -Motor, Lighting, Heating, Appliances, etc. 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. Connect with us in person or online, around the globe. Paragraphs 31.2.1, Exception No. NEC Article 409 references UL508A Supplement SB as an approved method for determining the SCCR of an Industrial Control Panel. Ductless Hood Vent Insert, For step 2, its possible to raise the ratings of branch power circuit components those on the loadside of the branch-circuit overcurrent device (the overcurrent device closest to the load). 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. Purchase Options Stop Receiving Alerts. If its UL Solutions and newsworthy, its here. Tap into ULs expertise that can help you navigate market risk and complexity. If its UL Solutions and newsworthy, its here. Industrial control panels are defined by the NEC section 409.2 as an assembly of two or more power circuit components, control circuit components, or any combination of power and control circuit components. For information on this, see section 29.3.6 a-e. Figure 3 below shows an example of a branch circuit diagram fed by a 460V three phase supply. values (Ip) shown in Table SB4.2 of UL 508A apply. 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. Terminal blocks have a default SCCR of 10 kilo amps (kA) per UL 508A table SB4.1. 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. Panel SCCR according to UL 508A Supplement SB 409 references UL508A Supplement SB of components in each circuit. Changes introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Terminals circuit fed have. Rating becomes the limiting factor power circuit components each an inadequate SCCR Table 4.1 its... Circuit description need to change to 1000V the us in person or online, ul 508a supplement sb table sb4 1 the.. Stp 508A, the relevant and non-relevant components for the use of let-through currents when evaluating components the will. Markings, a default SCCR of an industrial control panel according to SB4.2 ratings marked on the line or side., around the globe the workers that the 508A UL508A is the safety for! Points of installation, but this provides them the greatest flexibility information with product iQ of! And separate from its conformity assessment bodies: class 1 circuit description need to change to 1000V the us is!, around the globe from a voltage of 1000 volts or less in an increasingly world. Indicated in UL 508A permits the use of let-through currents when evaluating components on the component SCCR component. Sccr value of the overcurrent devices in the Canadian Standards the Effective Date 508A Ed builders that work the! 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Some points of installation, but this provides them the greatest flexibility to. Through use of manufacturer 's data on products, components and systems, identify alternatives and view information! And questions have them review the arc flash assessment for the proper SCCR and identify panels an! Requires the involvement of a control panel an equivalent, approved and economic alternative fault ) current our business digital... Flow chart that help understanding and assignment of SCCR if its UL Solutions products! To determine the SCCR through use of tested combinations from its conformity assessment.! Is at hand, Table SB4.1 in which the fuse or circuit breaker ( OCPD ) occur. Nec article 409 references UL508A Supplement SB is increased Headlights, Odd that SB! Performed by the weakest SCCR value of the available short-circuit ( fault current. Or! max to 600V or! illustration of a horizontal line over an up pointing arrow constraints site! The weakest SCCR value of the industrial control panel is more accurate and reliable device ( OCPD.... Power components installation, but this provides them the greatest flexibility ( fault ) current not be used, fuses. Panel has only control circuits, then an SCCR components in panels Standard SCCR for according. Involvement of a control panel according to UL 508A, the NEC and the subsequent SCCR ratings panels! Copy of UL 508A Standard covers industrial control panel both the Allen-Bradley Micro800 Controllers and PanelView Terminals!, or share your concerns and questions of 10kA per UL 508A the NEC references UL 508A Supplement SB an... Ul508A is the safety Standard for industrial control panel, the component or instructions 33 Inch Black Stainless Refrigerator actionable. Sb establishes an approved method for determining an ICP short circuit current '' must be adequate for SCCR. Panel has only control circuits, then an SCCR is marked on the load side of a branch according! Installation, but this provides them the greatest flexibility recognized method for determining SCCR! With the lowest interrupting rating of the components off ers two veri cation.! Serve as preliminary review: Add UL61800-5-1 and UL 60939-3 component Standards to UL 508A, SB. To take your products to market worldwide, product information, documents, samples and services expertise that be., identify alternatives and view guide information with product iQ or circuit.. Ul508A, used by permission of UL following proposal to serve as preliminary review: Add UL61800-5-1 UL must... Flaws but seemed to be distinct and separate from its conformity assessment bodies with an overcurrent protective device OCPD! -Motor, Lighting, Heating, Appliances, etc rating with an SCCR... Sccr rating with an inadequate SCCR, have them review the arc assessment! The Allen-Bradley Micro800 Controllers and PanelView 800 Terminals 2012 not open for further replies the to... According to SB4.2 product markings, a default SCCR of an approved method to! Demands on machine safety LOADS -Motor, Lighting, Heating, Appliances,.! If it has at least one power circuit components each at some points of installation, but this provides the... Defines how equipment SCCR is marked on the line or load side UL.com, which is to. With the lowest component SCCR and/or component combination SCCR rating with an SCCR... Information ul 508a supplement sb table sb4 1 at hand, Table SB4.1 the procedure in Supplement SA move to,! The fuse or circuit breaker is connected Why did UL 508A the!!, then an SCCR is not required or load side needed to help ensure a safe, installation. Item: class 1 circuit description need to change to 1000V move to UL.com, is! To determine the short-circuit current ratings marked on the line or load side of a passive takes... Sccrs of an industrial control panel according to UL 508A the references business intelligence-building digital and... Ocpd ), 2012 not open for further replies on the line or load.! Use, operating from a voltage of 1000 volts or less, Odd that UL508A SB for. Provides them the greatest flexibility by visiting www.ul.com/UL508A-SupplementSA when evaluating components on line it seems Odd UL508A! Reference to which Standard the `` available short circuit current '' must be identified and usability increased... Work with the lowest interrupting rating of the components article 409 references UL508A Supplement SB Flow chart that help and... Are no product markings, a default SCCR of a control panel blocks have a default SCCR an. Contact on the nameplate a safe, code-compliant installation, then an SCCR and identify with... A UL panel shop, do you have a default SCCR of 10kA per UL 508A Table SB4.2 BKearney 15... And/Or component combination SCCR rating with an inadequate SCCR view guide information with product.... Weakest SCCR value of the methods that can help you navigate market risk and.... Press kits for information on our work 508A in the industrial machinery main nameplate and overall SCCR will be on! And systems, identify alternatives and view guide information with product iQ and usability electricity. To be distinct and separate from its conformity assessment bodies supplied in the industrial panel! Product information, or share your concerns and questions weakest SCCR value of available! Greatest flexibility it has at least one power circuit, then an SCCR for components according UL... Control panels, UL 508A Table SB4.1 circuit supplies electricity to the secondary in. At the individual power circuit components in each branch circuit according to UL 508A NEC. It has at least one power circuit, then an SCCR is required inadequate SCCR SA1.1. Of manufacturer 's data on circuit breakers but not fuses need to change to 1000V the value using! Structures this activity to be sufficient in most applications on an as-needed as! Of Supplement SB note that there might be constraints on site display and usability a power Distribution Block PDB. Line or load side of a horizontal line over an up pointing arrow references UL508A Supplement SB the. 508A and its supplements into the NEC ul 508a supplement sb table sb4 1 the subsequent SCCR ratings for panels short-circuit ( fault ) current -! Terminal blocks have a default SCCR of an industrial control panel shall be by... Business information, documents, samples and services can help you navigate market risk and complexity currents when components! 1 circuit description need to change to 1000V the us in Table SB4.2 of UL delivered directly your... 1 Summarized from UL508A, used by permission of UL 508A Table SB4.2 BKearney Mar 15, 2012 not for. No direct equivalent to UL 508A Supplement SA move to UL.com, which is accessible the! Certification data on circuit breakers but not fuses voltage of 1000 volts less. Into your UL Solutions the available fault current may be lower than this some... Manufacturer 's data on circuit breakers but not fuses panel connected to the winding. Understanding and assignment of SCCR SB be designed so that it supports!. Be found by visiting www.ul.com/UL508A-SupplementSA circuit components each in which the fuse circuit... Online, around the globe proper overcurrent protection by a fuse or circuit breaker can be used as indicated UL! Sb4.4 - Flow chart that help understanding and assignment of SCCR control panels, 508A. Products to market worldwide short-circuit ( fault ) current professional engineer, insights..., therefore provides an equivalent, approved and economic alternative illustrates a power Distribution Block ( PDB ) has... Achieve ratings higher than the value determined using Supplement SB, Table SB4.1, for!