Adobe designed the portable document format, or pdf, to be a document platform viewable on virtually any modern operating system. An oversized pdf file can be hard to send through email and may not upload onto certain file managers. As testing is always time consuming, as well as incurring signi. Ul 508a, supplement sb is an approved method to determine. Ul 508a control panels basics and benefits control. Ult 508a, specifically for use in industrial machinery applications. This guide is designed to cover the most common applications of electrical control products per ul 508a, but is by no means an exhaustive guide, and does not cover all uses and applications associated with ul 508a regulations. Overview of supplement sb from the ul 508a standard. Ul508a is the ul standard for the construction of industrial control panels. Basic steps for calculating the sccr of a control panel. Ul 508a, supplement sb, provides an analytical method to determine the shortcircuit current rating of an industrial control panel. A pdf portable document format is a widely popular type of document format created by adobe. Control components branch and feeder circuits power transformer vs. Ul 508a industrial control panels power distribution and control.
Get more information about how ul 508a affects you, how to select a short circuit current rating, and understanding ul 508a. Formerly supplement sa of ul 508a 1 listed components 1. You can use the tools in paint to add something to a different document. Ul 508a control panels basics and benefits control works. This guide is not intended to be used in lieu of ul 508a or other regulatory standards. The elevator control panel shall not be installed where its the available shortcircuit current exceeds its shortcircuit current rating, as marked in accordance with 620. Ul 508a, standard for industrial control panels, supplement sb, is an example of an approved method. Selecting the right switch for the right application.
To combine pdf files into a single pdf document is easier than it looks. A pdf file is a portable document format file, developed by adobe systems. The pdf format allows you to create documents in countless applications and share them with others for viewing. In the case of a motor feeder, a number of component combinations may be used to ensure the functions, however. All components in power circuit must have ratings ratings of starters are typically based on hp rating supplement sb, table sb4. This article explains what pdfs are, how to open one, all the different ways. Establishment of the sccr on the basis of standard values if components are unmarked. Ul 508a industrial control panels louisville ieee section. At the municipal, county and state levels, electrical codes are being amended at an increasing rate to include the requirement for sccr labeling of industrial control panels per nec409. As of april 25, 2006, ul 508 listed panels must be. The nec proposes the method stipulated in ul 508a, supplement sb, as an example for shortan approved method. This document gives guidelines to panel builders on various issues including proper component selection, wiring. Shortcircuit current rating markings are not required for industrial control panels containing only control circuit components. Ul 508a supplement sb requires a 3step process to determine the sccr of an industrial control panel.
Nec article 409 and ul 508a shortcircuit current rating sccr of industrial control panels. 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. These standard values must be used if the technical documents do not provide sccr. Examples and practice problems will be provided to further enhance the concepts.
For each, protection and control functions are stipulated. This presentation will cover ul 508a procedures outlined in supplement sb to determine the shortcircuit current rating of an industrial control panel. The table below is extracted from the ul 508a supplement sb, table sb4. Pdf file or convert a pdf file to docx, jpg, or other file format. Ul 508a supplement sa specific component requirements ul.
The nec article 409 refers to the ul 508a supplement sb as an approved method for determining the sccr of an industrial control panel. The paint program can help you make new image files, but it cannot open document or pdf file. Evaluate panel per ul508a, supplement b required by 406 if jurisdiction does not adopt 2005 nec earlier. Ul 508a industrial control panels advanced motor controls is a ul 508a certified industrial control panel builder, file number e357530. Combination ratings for spectra with power distribution blocks pdf contactors and overloads sccr ratings instruction sheets with sccr ratings ul tested combinations pdf feeder components that limit sccr available ul 508a sb4. We offer a single source solution for custom control panel boards, from design, assembly. Shortcircuit current rating of a listed and labeled assembly b. Nec409 ul 508a support ul 508a supplement sb ul508a is a safety. Jul 16, 2020 additionally, ul 508a certified shops are subject to regular, unannounced inspections to ensure that the manufacturer continues to meet ul 508a requirements.
If the control panel is intended as service equipment, then it must be properly marked to identify that as its suitable use. Design of a motor circuit as per standard ul 508 part iv and ul 508a chap. I paid for a pro membership specifically to enable this feature. This white paper explains how ul 508a supplement sb is used to determine panel sccr and how the use of typetested components and currentlimiting fuses can increase panel sccr. This is typically somewhere between 240vac 600vac, 3 phase power. Supplement sb is the ul approved method for determining the sccr for industrial control panels based on the power circuit components within the. Always consult all pertinent actual regulatory standards and local standard representatives to ensure full compliance.
As per ul508a supplement sb, seifert systems air conditioners have a default sccr of 5 ka. The power circuit supplies electricity to the workers that do the heavy lifting, powering large motors, for example. This means it can be viewed across multiple devices, regardless of the underlying operating system. Tested product combinations to meet nec article 409 and ul. Ul 508a, but is by no means an exhaustive guide, and does not cover all uses and applications associated with ul 508a regulations. 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. The sccr requirements in the 2005 nec article 409 and supplement sb of ul 508a place stringent requirements on the ratings of each component inside the.
The use of recognized components is discussed in section 2. This document gives guidelines to panel builders on various issues including proper component selection, wiring methods and calculation of short circuit current ratings. Achieving higher short circuit current ratings for. These standard values must be used if the technical documents do not provide sccr values for the applied devices. Pdf is a hugely popular format for documents simply because it is independent of the hardware or application used to create that file. In addition, solutions and resources will be provided to help easily achieve high shortcircuit current ratings. For specific questions about how to apply ul 508a to your industrial control panel. Making a pdf file of a logo is surprisingly easy and is essential for most web designers. How to shrink a pdf file that is too large techwalla. Supplement sb allows the panel manufacturer to assign an sccr to a panel without testing the assembled panel. 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. Please refer to the ul website to view the most uptodate table sb4. Reference manual shortcircuit current rating sccr of.
Luckily, there are lots of free and paid tools that can compress a pdf file in just a few easy steps. This revision of ansi ul 508a dated april 16, 2020 includes the following changes in requirements. Test each panel construction and record the construction in a followup procedure. First, find out the lowest sccr of any component in the control panel. Once you have all of the component ratings, either use an outside service or ul508a supplement sb. Ul 508a 2001, supplement sb, is an example of an approved method. Shortcircuit current rating established utilizing an approved method fpn.
Ul 508a industrial control panels power distribution and. Shortcircuit current rating established utilizing an approved method. Ansi ul 508a, standard for industrial control panels, supplement sb, is an example of an approved method. The following topics were discussed at the meeting of the standards technical panel for industrial control panels, ul 508a. A secure pdf license can be reassigned to a different computer if necessary. The secure pdf file needs to remain open for offline viewing. In order to stay compliant and keep production moving, industrial control panel manufacturers need to be prepared. Ul 508a supplement sa specific component requirements. Determination of the sccr values of individual components. An internet connection is required to open a secure pdf.
Second, see if there are current limiting devices ahead of the control panel that will limit the actual amount of current available at the control panel during a short. Ul 508a covers industrial control panels and industrial panel enclosures operating at 600. This document is intended to be used to determine the requirements for components when used in industrial control panels. 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. That means requirements for the entire ul 508a 2nd edition including many changes that previously were unenforced are now in effect. We will help with the acceptance ul 508a standard pdf download a1d9fc608e share on facebook in industrial control panels according to ul508a.
An electrical wiring diagram or the number of the index to the electrical drawings that shows the diagram. Nec recognizes ul 508a, the supplement sb as an approved method for determining panel sccr. Advanced motor controls designs and manufactures custom control panels to meet your electrical and design specifications. Most electronic documents such as software manuals, hardware manuals and ebooks come in the pdf portable document format file format. Eriflex ul flexibar ampacity input 2 x 20 x 1 211 4 x 15. This method is based upon the weakest link approach. By michelle rae uy 24 january 2020 knowing how to combine pdf files isnt reserved. In order to open a secure pdf, you will need to install the fileopen plugin and register your computer. One of the fun things about computers is playing with programs like paint. Adobe systems is a software manufacturer that has created many document and multimedia editing programs. Once a shop is ul 508a certified, they can create mass produced or custom designed ul 508a industrial control panels without the need of having ul examine each design. If your pdf reader is displaying an error instead of opening a pdf file, chances are that the file is c. Firstly, by having the system tested to a recognised veri.
The method stipulated in ul 508a, supplement sb, is also referenced in article 670, industrial machinery. File e198310 ud 80 a udj 160 a fsj udj 125 a 85 amp modular. With the release of the ul 508a, ul standard for safety for industrial control panels, an industryapproved method is now available. Once youve done it, youll be able to easily send the logos you create to clients, make them available for download, or attach them to emails in a fo. Ul standard for safety for industrial control panels, ul 508a second edition, dated december 20, 20 summary of topics this revision of ul 508a is issued to correct table sb4. Sccr of the installed and ul listed components in the power circuit step 2. Prior to the release of the latest edition of ul 508a, supplement sb dated december 20, 20, sccr applied only to the power circuit of a control panel. Ul 508a procedure for establishing the sccr determination of the shortcircuit current rating sccr acc. Ul 508a is a standard covering industrial control panels. Ul 508a 20, supplement sb, is an example of an approved method. Nec requires that control panels are marked with their sccr. White paper understanding the concepts behind short circuit.
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