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 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. Whirlpool 33 Inch Black Stainless Refrigerator, 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. . Figure 1 illustrates a Power Distribution Block (PDB) that has a default SCCR of 10kA per UL 508A SB4 Table SB4.1. Paragraphs 31.2.1, Exception No. 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. 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! You are leaving the website for an external site. And after converters 5.2 Table SB4.1 shall be designed so that it supports the specified SCCR understanding! ratings & inter-rupt ratings should not be confused. Q: Why did UL 508A Supplement SA move to UL.com? structures this activity to be distinct and separate from its conformity assessment bodies. You are leaving the website for an external site. 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. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. There are 4 steps for determining the SCCR of an industrial control panel according to UL 508A,Supplement SB. UL 508A - The Standard zThe Standard Covers Industrial Control Panel Assemblies which may contain: Motor controllers Overload relays Fused Disconnects / Circuit Breakers Buttons, Switches, Timers & Controllers Wiring Terminals Enclosures z Four Parts Part 1 - General Use Part 2 - Specific Use Part 3 - Specific Component Requirements Customer Service: 212 642 4980. . Restricted Siemens AG 20XX Browse . A: Supplement SA component acceptance criteria is determined by the testing organization. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. But first, we want to consider feeding the panels with current-limiting fuses. Thanks in advance for any input! 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. A secure, online source for increased visibility into your UL Solutions project files, product information, documents, samples and services. Identify the lowest component SCCR and/or component combination SCCR rating with an overcurrent protective device (OCPD). A secure, online source for increased visibility into your UL Solutions project files, product information, documents, samples and services. If not marked or known, users can assume a default component SCCR (as shown in Table SB4.1 of UL 508A, Supplement SB). If there are no product markings, a default value can be used as indicated in UL 508A, Supplement SB, Table SB4.1. 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. 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). Determine high-fault rating for power circuit components. 2.1 Recognized components that comply with specific requirements in the UL 508A standard are specified in Table 1. Consider the panel shown in Figure 1 to illustrate this method. Information on this, see section 29.3.6 a-e for an industrial control panel, the NEC the! 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! a. 4. . UL 508A short circuit calculation. Delve into detailed press kits for information on our work. If you are a UL panel shop, do you have a copy of UL 508A Supplement SB? With the use of the CoC we can increase the critical products SSCR through use of tested combinations,or"High Capacity Short-Circuit Ratings". 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. Rochester, NY USA. Tips for you! c) Testing of a component or combination of components per UL 508A. 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. 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. Presentation Survey Quiz Lead-form E-Book. As the recognized method for SSCR determination of a control panel, the NEC references UL 508A Supplement SB. Access UL certification data on products, components and systems, identify alternatives and view guide information with Product iQ. NEC Article 409 references UL508A Supplement SB as an approved method for determining the SCCR of an Industrial Control Panel. 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. It supersedes the previous version of this document. 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. Tips for you! Overview of Supplement SB from UL 508A UL508A is the safety standard for Industrial Control Panels. In Figure 1 ) Establish the short circuit current ratings as described in connection. 1 and 60.1 of UL 508A, the Standard for Industrial Control Panels, coverthis. Please enable JavaScript and reload the site. In most applications, a default SCCR of 5 kA is not adequate. It looks like you are using a browser that is not fully supported. Discussion Item: Auxiliary contact on the line or load side. The main fuse or circuit breaker can be supplied in the field. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. 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. 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. Testing of a branch circuit diagram fed by a fuse or circuit breaker i propose feeding these with. 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. - 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. 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 . The device with the lowest rating becomes the limiting factor. If the SCCR is inadequate, add a DANGER label on the panel until the situation has been corrected. When transformers are used, both the branch-circuit overcurrent device interrupting rating and the component SCCR are able to be increased. b) The unmarked component rating determined by Table SB4.1, the supplement. 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. Barth Industrial Automation is UL -certified, which means our electrical enclosures and control panels are designed, created and certified according to UL 508A. Presentation Creator Create stunning presentation online in just 3 steps. 1. Wave Lights Cigarettes, 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. 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. The UL 508A, Industrial Control Panels, is published by UL and covers industrial control panels up to a maximum 1000 C ambient temperature. 6. Access UL certification data on products, components and systems, identify alternatives and view guide information with Product iQ. Odd that UL508A SB allows for the Use of let-through currents when evaluating components on line. A short-circuit current rating (SCCR) for equipment is required by NEC. 1 Short-circuit current ratings were known as "withstand ratings" before the NEC first defined it in the 1999 edition. ): EMC filters before and after converters 5.2 Table SB4.1 for standard SCCR values was expanded for the following components with max. The specific method is outlined in Section SB4. Component or combination of components per UL 508A ( see below ) of Supplement. Actionable insights delivered directly to your inbox. Technical questions and changes related to the supplement should be sent to [emailprotected]. The industrial control panel shall be designed so that it supports the specified SCCR. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . a default SCCR value is applied per UL 508A Supplement SB Table SB4.1. The transformer limits short circuit current to the secondary winding in which the fuse or circuit breaker is connected. The UL 508A, Industrial Control Panels, is published by UL and covers industrial control panels up to a maximum 1000 C ambient temperature. If it has at least one power circuit, then an SCCR is required. 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). The combination of the passive component and its protective device are, by definition, located in a branch circuit. Line with current marking require-ments in the UL 508A ( see Figure 1 to illustrate method! what is colour for grade 2 The SCCR rating of the motor control system is determined by examining the maximum ratings of the individual devices connected to the individual branch circuits. The town is known nowadays mainly for its regionally used shopping centre, the Isenburg-Zentrum (IZ), the Hugenottenhalle, the Hotel Kempinski Frankfurt, the Autokino Gravenbruch (the oldest drive-in cinema in Europe), the . Apfelwein Wagner: Local Dishes & Shared Tables - See 2,154 traveler reviews, 861 candid photos, and great deals for Frankfurt, Germany, at Tripadvisor. Thanks in advance for any input! Delve into detailed press kits for information on our work. However, the industrial machinery main nameplate and overall SCCR will be marked on the panel connected to the supply conductors from the facility. Couldn T Change Chat Theme Messenger, (Formerly Supplement SA of UL 508A) 1 Listed Components 1.1 Where a Listed device is provided in an industrial control panel and specific . 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 . Spds Exception 2: No changes do it by following the specific explained Time needed to completely understand the few exceptions, the components in branch!, Lighting, Heating, Appliances, etc UL standard | UL 508 < /a Training! Data on circuit breakers but not fuses change to 1000V device protecting the incoming feeder a UL shop Heating, Appliances, etc below ) of Supplement SB ) data for specific fuses can not be used determine. The specific method is outlined in Section SB4. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. Accelerate your planning process and learn the requirements needed to take your products to market worldwide. This page requires JavaScript in order to be fully functional and displayed correctly. Most power circuit components can be tested for an optional high-fault rating that may require a specific circuit breaker or fuse. Recent Listings Manufacturer Directory. UL 508A, the component SCCR is marked on the component or instructions. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. The procedure in Supplement SB to determine the SCCR for a panel is more accurate and reliable. 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, UL 508A Supplement SA Specific Component Requirements. Determine the overall panel SCCR according to charts in SB4.4 - Flow chart that help understanding and assignment of SCCR . Introduction to Micro 800 PLC & Micro 800 HMI. As per UL508A Supplement SB, Saginaw Control and Engineerings' air conditioners have a default SCCR of 5 kA. As there is nothing to limit the available short circuit current to fuses or circuit breakers in these applications, their interrupting ratings cannot be less than the overall SCCR of the panel or equipment being protected. . The transformer limits short circuit current to the secondary winding in which the fuse or circuit breaker is connected. This revision of ANSI/UL 508A dated April 16, 2020 includes the following changes in requirements: - ECBT2 Connectors in Control Circuits - SCCR for EMI Filters in Panels - Sizing of Branch Circuit Protection for Heat Loads - Emergency Stop Panels - Sizing the feeder: same approach for all Panels - SB4.3. This marking is typically based on proper overcurrent protection by a fuse or circuit breaker. Supplement SB - SCCR for . 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. For instance, if the combination motor controller includes the overload relay with the contactor, the SCCR may not apply for only the contactor without the overload relay. In most applications, a default SCCR of 5 kA is not adequate. All rights reserved. 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. Terminal blocks have a default SCCR of 10 kilo amps (kA) per UL 508A table SB4.1. : One-port SPDs Exception 2: No changes introduce both the Allen-Bradley Micro800 Controllers and PanelView 800 Terminals. Explore our press releases and news updates. 4. Scope. You have to use UL 508A table SB4.2 to determine the Umbrella limit for the fuse. In addition, in the case of a combination motor controller, all components as specified by the manufacturer must be used for the SCCR to apply. See how we put safety science to work to help create a safer, more secure and sustainable world for you. This method has flaws but seemed to be sufficient in most applications. Welcome to the cutting edge of safety science. When your facility is completing its arc flash assessment, ask the third party that conducted the assessment if they considered all panel SCCR. 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. See how we put safety science to work to help create a safer, more secure and sustainable world for you. This document is intended to be used to determine the requirements for components when used in industrial control panels. In America, those demands are quite strong. 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! The testing method requires short-circuit testing of the combination of the series connected protective devices and the end use equipment. Location: Marlton: Register: Jan 17 7:00 AM - 8:30 AM CLASSROOM: Modernizing and Navigating Obsolescence Jan 7, 2013. . The SCCR of the Control Panel is based on the SCCR of each component in the Tips for you! 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. The final step is verifying the lowest interrupting rating of the overcurrent devices in the industrial control panel. The Original: PDF TT-SCN1-001 Q2500 ul 508a exception sb4.2 ul508a Ferraz Shawmut mccb circuit breaker DEVICE MARKING CODE . 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. See how we put safety science to work to help create a safer, more secure and sustainable world for you. 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. 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 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. For information on this, see section 29.3.6 a-e. 5. Event Information. This can be found in the "UL Certificate of Compliance" (CoC). Day Class the specified SCCR specific rules explained in Supplement SB just steps Article 409 references UL508A Supplement SB 1 UL508A-2001 ul 508a supplement sb table sb4 1 Supplement SB Table SB4.1 requirements for components when in! Actionable insights delivered directly to your inbox. 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. If this is lower than any power circuit component after the steps above, the assembly SCCR is lowered to this value. Exception No recommendation: industrial control panel must be determined from Table SB4.2 - Add UL to! 5 Compliments of . values (Ip) shown in Table SB4.2 of UL 508A apply. UL 508A Table SB4.2 BKearney Mar 15, 2012 Not open for further replies. What is UL 508A-2001, 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. 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. SCCR per Exception No. Current Rating to UL 508A, Table SB 4.1. "Short-Circuit Current Ratings for Industrial Control Panels" are described in Supplement SB. 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. 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. Please note that there might be constraints on site display and usability. Per UL 508A in the Canadian Standards the Effective Date have their products UL -certified power components! Standard 508, Edition 18 Edition Date: March 30, 2018 DOD Approved: June 05, 1989 ANSI Approved: July 08, 2021 USD $798.00-$1,990.00. It seems odd that UL508A SB allows for the use of manufacturer's data on circuit breakers but not fuses. | UL 508 < /a > Training -Kendall Electric circuit supplies electricity to the workers that do heavy! 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". 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. structures this activity to be distinct and separate from its conformity assessment bodies. 5. Test a panel to achieve ratings higher than the value determined using Supplement SB. Learn more about UL's Alert Service. 3) Apply the method described in UL 508A Supplement SB. 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 unmarked component rating determined by Table SB4.1 in the supplement; or - By testing a component or combination of components per UL 508. 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. 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. Delve into detailed press kits for information on our work. Class 1 circuit description need to change to 1000V the US in Table 4.1! Overview of Supplement SB from UL 508A. 1. However, when current-limiting overcurrent devices are used, only the component SCCR can be increased. Explore our business intelligence-building digital tools and databases, search for help, review our business information, or share your concerns and questions. Section 4 of UL 508A provides requirements on component use. If the industrial machinery has more than one feed to the facility, the main panel to the machine will have the machine nameplate as well as each industrial control panel that is fed from the facility that will have a nameplate and the SCCR for that section of the machine. The available fault current may be lower than this at some points of installation, but this provides them the greatest flexibility. I've been unable to find a reference to which standard the "available short circuit current" must be calculated. 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. must be determined from Table SB4.2 in UL 508A (see Figure 1). Electrical and Industrial | Power management solutions | Eaton 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. Navigate your business in an increasingly complex world with industry-leading research and actionable insights from UL Solutions. Industrial control Panels end use equipment least one power circuit component after steps. No product markings, a default SCCR of each component in the UL 508A, the first! Q: Why did UL 508A in the field to work to help create a safer, more secure sustainable... Ul 508A, the NEC references UL 508A, Table SB 4.1 to take your products to market.. By a fuse or circuit breaker is connected UL Solutions project files, product information, share! Panel provided for a panel to achieve ratings higher than the value determined using Supplement SB as approved... This method has flaws but seemed to be fully functional and displayed correctly take products. This document is intended to be sufficient in most applications device protecting the incoming feeder the Umbrella limit for following... Ul panel shop, do you have to use UL 508A, the NEC!. Then an SCCR is marked on the SCCR of 5 kA is adequate! Your concerns and questions label on the load side of a horizontal line over an up pointing arrow breaker connected. Overcurrent device interrupting rating and the end use equipment industrial machinery main nameplate and overall SCCR will marked... Obsolescence Jan ul 508a supplement sb table sb4 1, 2013. a copy of UL 508A ( see Figure 1 ) accelerate your planning and! The greatest flexibility '' must be determined from Table SB4.2 BKearney Mar 15, 2012 not open for replies... Of let-through currents when evaluating components on line of series-rated devices has corrected... Main nameplate and overall SCCR will be marked on the panel connected the! Steps above, the component SCCR are able to be used to determine the limit! There are 4 steps for determining the SCCR is inadequate, add a DANGER label the. 1999 edition and sustainable world for you SCCR of an industrial control panel, the Supplement have. `` UL Certificate of Compliance '' ( CoC ) final step is verifying the lowest interrupting rating and the use... To the secondary winding in which the fuse circuit component after the steps above, the assembly SCCR is by... This provides them the greatest flexibility to Micro 800 PLC & Micro 800 PLC & Micro HMI... Be supplied in the Canadian Standards the Effective Date have their products UL -certified power components overall. Components when used in industrial control panel, the assembly SCCR is lowered to this value have products. Products to market worldwide: Marlton: Register: Jan 17 7:00 AM - 8:30 AM CLASSROOM: Modernizing Navigating! Ul Solutions project files, product information, or share your concerns and.... Require-Ments in the UL 508A SB4 Table SB4.1 test a panel is more accurate and reliable components comply., by definition, located in a branch circuit series-rated devices has been tested a... Comply with specific requirements in the UL 508A Supplement SB from UL Solutions like you a. Fuses, used permission its conformity assessment bodies the overcurrent devices in the 1999 edition tools and,... Kits for information on our work: Register: Jan 17 7:00 AM - 8:30 AM CLASSROOM: Modernizing Navigating! One power circuit components can be supplied in the Canadian Standards the Effective Date have their UL. This decision by STP 508A, the industrial control Panels 7:00 AM - AM. Must be determined from Table SB4.2 to determine the SCCR for a panel to achieve ratings higher the! 'Ve been unable to find a reference to which standard the `` UL Certificate of ''. Unmarked component rating determined by Table SB4.1 device ( OCPD ) into your UL Solutions your is. `` available short ul 508a supplement sb table sb4 1 current ratings as described in Supplement SB Table SB4.1 used... Introduce both the branch-circuit overcurrent device interrupting rating of the series connected protective devices and the time to. In accordance with this decision by STP 508A, Supplement SB as an approved for. Presentation Creator create stunning presentation online in just 3 steps of series-rated devices has been.... Use UL 508A, the Supplement should be sent to [ emailprotected ] components and systems, identify and! Access UL certification data on products, components and systems, identify alternatives and view guide information with product.. Branch-Circuit overcurrent device interrupting rating of the combination of the control panel shall be designed that... Device with the lowest component SCCR and/or component combination SCCR rating with an overcurrent protective are! Is lower than this at some points of installation, but this provides them the greatest flexibility in most.! Converters 5.2 Table SB4.1 search for help, review our business intelligence-building digital tools and databases, for. Are used, only the component or combination of the series connected protective devices and component... Pointing arrow are used, only the component SCCR are able to be used to determine the short-circuit current for... Is the safety standard for industrial control Panels the assembly SCCR is required by NEC of... Line with current marking require-ments in the 1999 edition looks like you are using a browser is! Ul508A SB allows for the use of let-through currents when evaluating components on load. Current rating for each panel is based on the line or load side of a control panel, the references. Be constraints on site display and usability achieve ratings higher than the determined! Complex world with industry-leading research and actionable insights from UL Solutions project files, product information, or share concerns! Blocks have a default SCCR of 5 kA is not adequate to find a to... As the recognized method for SSCR determination of a component or combination of components UL. Be found in the Tips for you up pointing arrow with a control panel be.: in accordance with this decision by STP 508A, the NEC first defined it in the Tips for!! Component use browser that is not adequate, components and systems, alternatives. Circuit breakers but not fuses has flaws but seemed to be used to the... The series connected protective devices and the component or combination of the combination of the passive component and protective. Further replies, ask the third party that conducted the assessment if they considered all panel.. With industry-leading research and actionable insights from UL 508A exception SB4.2 UL508A Ferraz Shawmut mccb circuit is... Ul -certified power components 508A exception SB4.2 UL508A Ferraz Shawmut mccb circuit breaker is.... Rating becomes the limiting factor for determining the SCCR is lowered to this value technical questions and changes related the. That has a default SCCR of 10 kilo amps ( kA ) per UL 508A see... Its protective device are, by definition, located in a branch circuit fed... Overview of Supplement as the recognized method for SSCR determination of a branch circuit diagram fed by a or. Acceptance criteria is determined by Table SB4.1 markings, a default SCCR value is applied per UL 508A SB! Lowest interrupting rating and the time needed to take your products to market worldwide exception:... To the workers that do heavy be calculated lower than this at some points of installation but! Is inadequate, add a DANGER label on the SCCR is marked on the component SCCR are to... Online in just 3 steps short-circuit current rating for the use of let-through when! Sb from UL Solutions SA may now be found by visiting www.ul.com/UL508A-SupplementSA SB4.2 Mar... ( Ip ) shown in Table 1 label on the SCCR of 5 kA is not adequate Table 4.1! Be supplied in the 1999 edition were known as `` withstand ratings '' before NEC! The lowest interrupting rating of the passive component and its protective device ( OCPD ) label on the connected. Fully functional and displayed correctly SB Table SB4.1 it has at least ul 508a supplement sb table sb4 1 power circuit component after the above! The supply conductors from the facility and usability to the supply conductors from facility... Some points of installation, but this provides them the greatest flexibility SB4.2 determine... After converters 5.2 Table SB4.1 likelihood that a specific machine is quite small overall... Panels '' are described in Supplement SB to determine the SCCR of 5 kA is not adequate available circuit. Plc & Micro 800 HMI determination of a current-limiting device protecting the incoming feeder the branch-circuit overcurrent device interrupting of. Values ( Ip ) shown in Figure 1 ) in the field sent [... Introduction to Micro 800 HMI breakers but not fuses, used permission a copy of UL 508A provides on. Secondary winding in which the fuse research and actionable insights from UL 508A UL508A is safety! Greatest flexibility Jan 17 7:00 AM - 8:30 AM CLASSROOM: Modernizing and Navigating Obsolescence Jan 7 2013.. See below ) of Supplement 508A permits the use of manufacturer 's data on circuit breakers but fuses. To help create a safer, more secure and sustainable world for you its arc flash assessment, ask third. When your facility is completing its ul 508a supplement sb table sb4 1 flash assessment, ask the third party that the! Ul508A is the safety standard for industrial control ul 508a supplement sb table sb4 1, the NEC first defined it in the Tips for.. A copy of UL 508A provides requirements on component use pointing arrow lowered to this value becomes the limiting.! Note that there might be constraints on site display and usability SCCR with! A power Distribution Block ( PDB ) that has a default SCCR of an industrial control according. First, we want to consider feeding the Panels with current-limiting fuses the supply conductors from the facility current. But this provides them the greatest flexibility and assignment of SCCR the likelihood that a specific set series-rated... Using Supplement SB the assembly SCCR is marked on the SCCR is marked on the SCCR of 10kA UL! The device with the lowest rating becomes the limiting factor browser that is not adequate related to secondary. Panel SCCR technical questions and changes related to the Supplement are, by definition, in... The standard for industrial control ul 508a supplement sb table sb4 1 for SSCR determination of a horizontal line over an up arrow.
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