Conditions of acceptability combination ul file reference ka max. Designing for safety compliance in industrial control panels ul 508a. Excerpts from ul 508a standard for safety for industrial control panels are the property of. Equipment intended to be connected to a source of supply greater. Instruction sheets with sccr ratings ul tested combinations pdf.
Ul508a standard for industrial control panels document. The ul standards for industrial control panels are referred to as ul 508a. Underwriters laboratory implemented ul 508a supplement sb to require compliance by ul authorized panel builders. Our strategic midwest location and our open availability makes meeting our customers strict deadlines possible.
All components in power circuit must have ratings ratings of starters are typically based on hp rating supplement sb, table sb4. To show you just how detailed the specification is, we have listed the table of contents from ul 508a see below. Sccr of the installed and ullisted components step 2. June 2018 55 may 2018 90 april 2018 36 march 2018 35 february 2018 28 january. Ul508a is a safety standard for industrial control panels adopted by underwriters. Underwriters laboratory implemented ul508a supplement sb. In this example, the 125a circuit breaker is the largest shortcircuit protective device. If you have been in the field much, i am sure that you are familiar with panels that look like a half wound ball of string. Ul 508a standard pdf download a1d9fc608e share on facebook. 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.
Reprint with revisions through and including february 4, 2010 246 pages. Supplement sb is the ul approved method for determining the sccr for industrial. Ul 698a, ul 508a, nfpa 79 certified control panels the. To show you just how detailed the specification is, we have listed the table of contents from ul508a see below. Ul 508a standard pdf download gaaphakerslingbeachs blog. Determination of the short circuit current rating according to ul 508a supplement sb. Not all of these elements should be used together with the same. A custom control panel is a purposebuilt solution individually engineered and madetoorder. Determining sccr for industrial control panels and.
Underwriters laboratory 508a 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. Latest facebook app for nokia s40 latest facebook app for n. The ul 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. We are proud that our ul 508a certified control panels are manufactured in the usa. Determination of overall sccr of industrial control panel ul 508a sb4. Jul 24, 2008 color coding of wires internal to control cabinets is covered both in nfpa79 and ul508a. The classic iec style manual motor protective switch, e. Shortcircuit current rating markings are not required for industrial control panels containing only control circuit components. Harmonization of iec and north american safety standards. Ul 508a industrial control panels power distribution and.
The new supplementary handle with deliberate action. Ul508a industrial colour code usa all about circuits. Determination of overall sccr of industrial control panel ul. Ul now offers the ability to purchase a premium hard copy of any ul standard. Formerly supplement sa of ul 508a 1 listed components 1. Strombegrenzende leistungsschalter im industrial control panel nach ul 508a. The second day instructs industrial control panel customers on how to establish shortcircuit ratings for individual industrial control panels in accordance with the requirements outlined in the new standard for industrial control panels, ul 508a, 3rd edition, supplement sb. The sccr requirements for ul 508a are effective after april 25, 2006. Ul is providing this alternative certification approach since the transition from ul 508 and ul 6094741a to ul 6094741 is a result of harmonization with the iec based standard. A ul 508a certification is an industrial control panel directive, which electrical inspectors look for.
This method is based upon the weakest link approach. The master for this standard at uls northbrook office is the official document insofar as it relates to a ul service and the compliance of a product with respect to the requirements for that product and service, or if there are questions regarding the accuracy of this standard. This document gives guidelines to panel builders on various issues including proper component selection, wiring. When the overall diameter of the ul mark is less than 38 of an inch, th er a dm ks yb olif ng. Each copy is watermarked with the purchasers information. This ul label, classified as ul 508a, when applied to an industrial control system, is a symbol of quality and reliability, and also guarantees compliance with nec and nfpa standards as well as safety standards. Design of a motor circuit as per standard ul 508 part iv and ul 508a chap. Assign the smaller of the two sc ratings to the line side of the bcpd. Underwriters laboratory implemented ul508a supplement sb to. This guide replaces neither the standards including ul 508a that electrical equipment must. Ul 508a procedure for establishing the sccr determination of the shortcircuit current rating sccr acc. Supplement sb is the ul approved method for determining the sccr for industrial control panels based on the power circuit components within the. Nec 409 ul 508a type a, 200v id number combination type component type component manufacturer component catalog designation component ratings combination ka combination volts combination phase maximum combination hp maximum combination nec flc minimum enclosure volume cu in.
Utilize a method described by underwriters laboratories inc. Through our network of over 30,000 people in 1,000 laboratories and offices in 100 countries, intertek provides quality and safety solutions to a wide range of industries around the world. If your jurisdiction does not adopt the 2005 code, control panels certified to the ul 508a standard will require a sccr rating in april 2006. Establishment of the sccr on the basis of standard values ul508a suppl. Selecting the right switch for the right application. We design, assemble, and install ul certified panels and can bring existing control panels up to ul safety standards, as well as build panels from the ground up meeting the customer requirements, while following ul safety standards. Underwriters laboratory, more commonly known as ul, offers certifications for companies that wish to engage in the business of building electrical control panels. Ul 508a supplement sb is the preferred option for nearly all industrial control panels. Sccr overall panel short circuit current rating klockner moeller. Ul 508a, supplement sb is an approved method to determine sccr for industrial control panels and industrial machinery control panels.
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. For each, protection and control functions are stipulated. Evaluate panel per ul508a, supplement b required by 406 if jurisdiction does not adopt 2005 nec earlier. Ansi ul 508a, standard for industrial control panels, supplement sb, is an example of an approved method. January 26, 2017 has been established as effective date for the change in certification requirements from ul 508 and ul 6094741a to ul 6094741. Black all ungrounded conductors at supply voltage, red all ungrounded ac conductors at less than supply. Ul508a supplement sb4 is the approved method for determining short circuit. Ul 508a industrial control panels power distribution and control. January 26, 2017 has been established as effective date for the change in certification.
Ul 508a, supplement sb, provides an analytical method to determine the shortcircuit current rating of an industrial control panel. Overview of code changes in nec article 409 overview of ul 508a supplement sb. Molded case circuit breakers for applications in north america eaton. With the release of the ul 508a, ul standard for safety for industrial control panels, an industryapproved method is now available. Purchase ul standards online official ul standards sales. Ul508a is the ul standard for the construction of industrial control panels. Maybe its a control panel for a hazardous location or maybe its the solution to a complex controls challenge where no two installations can be exactly alike. Supplement sb of the ul508a is noted as being an approved method for determining the short circuit current rating of a control panel. Color coding of wires internal to control cabinets is covered both in nfpa79 and ul508a. Ul 508a supplement sb 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.
Determination of overall sccr of industrial control panel. Immediately get your hands on custom printed labels for your complex electric panel. Ul 508a standard for industrial control panels standards. Shortcircuit current ratings of industrial control panels ul 508a, supplement b. This supplement is the only method specifically noted as being. In the case of a motor feeder, a number of component combinations may be used to ensure the functions, however. Ul us c listed ul us c listed ul us c listed c ul us listed c ul us listed c ul us c ul us listed c ul us listed c ul us listed t h emin u g t ofr sd ak y bl 364 an inch. Ul 508a certification description from quality controls, inc. How to facilitate the ulcompliant approval to your control panel. This ul label, classified as ul508a, when applied to an industrial control system, is a symbol of quality and reliability, and also guarantees compliance with nec and nfpa standards as well as safety standards. Builders adhering to these standards are allowed to attach the ul label to the product. Ul 508a certification is an industrial control panel directive, which is sought by electrical inspectors.
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