Advanced guide to understanding assembly shortcircuit current rating simplified. Control panel technical guide how to ensure trouble free approval of your ulcompliant control panels 8 2 ul standards and circuit design design of a motor circuit as per standard ul 508 part iv and ul 508a chap. The ul 508a listing mark on an industrial control panel provides evidence of third party certification to the municipal inspection authority and to the purchaser of the panel. This is not a bad thing, mind you, because we must take care to ensure safety with control panels so its only fitting that our practices be tried and true. Use of current limiting devices transformers, fuses, circuit breakers. Ul508a supplement sb4 is the approved method for determining short circuit current ratings for industrial control panels.
And in the case of industrial control panels, change also tends to come slowly. Ul 508a certification is an industrial control panel directive, which is sought by electrical inspectors. Ul508a is a safety standard for industrial control panels adopted by underwriters laboratory which is an approved method in determining sccr. Industrial control panels, supplement sb, is an example of an. Ul, a notforprofit, nongovernmental organization that was formed in 1894 to help reduce injury, loss of life and property damage. Download it for free by clicking on the register for free download link and. Designing for safety compliance in industrial control. Supplement sb, provides an analytical method to determine the shortcircuit current. Control panel technical guide how to ensure troublefree approval of your. Ul, a notforprofit, nongovernmental organization that was formed in 1894 to help reduce injury, loss of life and property.
Ul 508a supplement sa specific component requirements ul. Determination of the short circuit current rating according to ul 508a supplement sb. Ul 508a supplement sb sccr method ul 508a supplement sb describes three steps to determine the sccr of industrial control panels. June 2008 ul 508 application guide make the most of your energysm. If sccr is not marked or known, use ul508a default table. Sccr of tested industrial control equipment assemblies series rating 2 circuit breakers in series or combination tests motor branch circuits step 4. All components in power circuit must have ratings ratings of starters are typically based on hp rating supplement sb, table sb4. If your jurisdiction does not adopt the 2005 code, control panels certified to the ul. Latest facebook app for nokia s40 latest facebook app for n.
Ppt nec article 409 powerpoint presentation free to view. Eaton is a major component supplier that is committed to providing this information to our customers. The workshop is ideal for those who need to understand the safety compliance requirements of the ul 508a standard for industrial control panels, as well as the new requirements found in the national electrical code nec article 409 and ul 508a supplement b. Ul 508a standard pdf download gaaphakerslingbeachs blog. Purchase ul standards online official ul standards sales.
Nec article 409 and ul 508a shortcircuit current ratings. Ul 508a control panel design guide the easytodesign guide for selection of electrical control components in control panels used in industrial machinery applications this guide is provided to assist with the design of control panels per ult 508a, specifically for use in industrial machinery applications. Ul 508a control panel design guide the easytodesign guide for selection of electrical control components in control panels used in industrial machinery applications this guide is provided to. Supplement sa specific component requirements part 2 specific use information you provide specific components not covered in ul508a supplement sb short circuit current ratings appendix b use of.
Ul 508a standard for industrial control panels standards. Designing for safety compliance in industrial control panels, ul 508a and shortcircuit current ratings elearning. Over 40% savings purcell systems manufactures ul 508a certified enclosures and cabinets to the ul 508a safety standard. This comprehensive one and a halfday workshop provides technical information to industrial control panel professionals. Equipment intended to be connected to a source of supply greater.
Sccr of tested industrial control equipment assemblies series rating 2 circuit breakers in series or combination tests motor. An internet connection is required to open a secure pdf. The ul mark stands for underwriters laboratories inc. Other application information on sccr publications. Ul 508a supplement sa specific component requirements. Underwriters laboratory implemented ul508a supplement sb to.
A secure pdf license can be reassigned to a different computer if necessary. Ul 508a, supplement sb identifies an approved process that can be used to. In order to open a secure pdf, you will need to install the fileopen plugin and register your computer. Complete analysis according to ul 508a supplement sb this is the recommended procedure for most panels and machines other.
Nec article 409 industrial control panel an assembly of two or more components such as motor controllers, relays, cbs, etcand related control devices industrial control panels do not include the controlled equipment. In 1992, csii created a value added shop in order to supply switches in enclosures with ul approval per customer request. Ul508a standard for industrial control panels document. Ul508a is the ul standard for the construction of industrial control panels. Multiple revision in 2017 slide alignment of ul508a with nec. The secure pdf file needs to remain open for offline viewing. Implementation of the standard component selection.
Ul 508a certification description from quality controls, inc. Ul508a origin current emphasis on ul508a what is the ul 508a standard. Design of a motor circuit as per standard ul 508 part iv and ul 508a. Purcell systems manufactures ul 508a certified enclosures and cabinets to the ul 508a safety standard this manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent damage to property. Once you have all of the component ratings, either use an outside service or ul 508a supplement sb. 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. Ul 508a industrial control panels power distribution and. Determine the sccr of all individual power components by one of the following methods sccr rating marked on the component use assumed sccrs in table sb 4.
Ul 508a supplement sb is given as an example of an approved method. Advanced guide to understanding assembly shortcircuit current rating simplified guide to understanding shortcircuit current rating find it, fix it, forget it spd selecting protective devices sections on industrial. The process for ul 508a, supplement sb analyzes the sccr for power circuit components, determines if these ratings can be raised by currentlimiting devices in the feeder circuit, and compares the lowest component rating with the lowest interrupting rating of overcurrent devices to determine the assembly sccr. Ul knowledge solutions industrial control panels ul 508a. How to facilitate the ulcompliant approval to your control panel. Industrial control panels sccr determining assembly sccr. Overview of ul508a supplement sb ul 508a 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. Control panel technical guide how to ensure trouble free approval of your ulcompliant control panels 8 2 ul standards and circuit design design of a motor circuit as per standard ul 508 part iv and ul. A brief history of ul 508a and tips for how control panel. Evaluate panel per ul508a, supplement b required by 406 if. Purchase previously tested combinations from a major supplier that can be tabulated in the panel builders procedure. Evaluate panel per ul508a, supplement b required by 406 if jurisdiction does not adopt 2005 nec earlier.
With the numerous possibilities for product combinations within. Technical appendix materials plastics and metals all the materials used for weidmuller products are subject to the strict quality control measures of the weidmuller qm system, which is accredited to din iso 9001. Overview of ul508a supplement sb ul 508a is a safety standard for industrial control panels adopted by underwriters laboratory, which is an approved method in determining sccr referenced by nec article. The introduction of new article 409 for industrial control panels in the 2005. Determining sccr for industrial control panels and industrial. Requirements for industrial control panel safety, implications of ul 508a 2nd edition. Formerly supplement sa of ul 508a 1 listed components 1. Supplement sb, provides an analytical method to determine the shortcircuit current rating of an industrial control panel.
Complete analysis according to ul 508a supplement sb this is the recommended procedure for most panels and machines other ahj approved method. Supplement sb identifies an approved process that can be used to determine the sccr for industrial control panels by analyzing the components in the industrial control panel. With the numerous possibilities for product combinations within a panel, this option will require a tremendous investment in testing and maintenance. 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. Selecting the right switch for the right application. This document is intended to be used to determine the requirements for components when used in industrial control panels. Control panel technical guide how to ensure trouble free approval of your ulcompliant control panels 7 ul standards and control panel design required electrical clearances differ considerably depending on the intended use of the product. How to determine shortcircuit current ratings iaei magazine. 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. Supplement sb is the ul approved method for determining the sccr for industrial. The workshop is ideal for those who need to understand the safety compliance. How to ensure troublefree approval of your ulcompliant. Eaton is a major component supplier that is committed to providing this. Determine the sccr of all individual power components and ul approved series ratings.
Instruction sheets with sccr ratings ul tested combinations pdf. Nec article 409 and ul 508a shortcircuit current ratings sccr. Sccr overall panel short circuit current rating klockner moeller. Modify the sccr of certain series combinations if currentlimiting devices are used in the feeder circuit. Requirements for industrial control panel safety, implications of ul. Simplify your panel design and project organization. For assemblies, the marking can be determined through the equipment product listing standard or by an approved method. Most backordered items can be rushed in from the publisher in as little as 24 hours. Utilize a method described by underwriters laboratories inc. Nec article 409 industrial control panel an assembly of two or more components such as motor controllers. Ul 508a supplement sb is the preferred option for nearly all industrial control panels.
It is a weakestlinkinthechain evaluation, meaning that the lowest sccr circuit within the panel. Control panel technical guide how to ensure trouble free approval of your ulcompliant control panels 7 ul standards and control panel design required electrical clearances differ considerably depending on. Underwriters laboratory implemented ul508a supplement sb. This is not a bad thing, mind you, because we must take care to ensure safety with.
Test each panel construction and record the construction in a followup procedure. Ul 508a, supplement sb is an approved method to determine sccr for industrial control panels and industrial machinery. The test has to be witnessed by a ul project engineer. Ppt nec article 409 powerpoint presentation free to. This document comes with our free notification service, good for the life of the document. At weidmuller, environmental compatibility plays a decisive role in the choice of materials. These requirements also cover industrial control devices or systems that store or process information and are provided with an output motor control functions. Ul 508a industrial control panels power distribution and control.
Purcell systems manufactures ul 508a certified enclosures and cabinets to the ul 508a safety standard this manual contains notices you have to observe in order to ensure your personal safety. Ul 508a standard for industrial control panels purcell systems. Download free nec article 409 and ul 508a 4 siemens. Download it for free by clicking on the register for free.