Ul 508a Standard Pdf 79
Halima Leisch
The first day of the workshop focuses on how to construct general use industrial control panels in accordance with the Standard for Industrial Control Panels, UL 508A, 3rd Edition. It covers UL 508A, general use ICP construction, power circuit, control circuit, rating and marking requirements, sections 1-61; enclosure construction requirements, sections 62-64; standards for components, Appendix A; use of non-UL Solutions components, Appendix B; and component usage, Appendix C.
UL Certification Customers have free access to UL Standards, not including UL IEC Based Standards. UL Certification Customers may access published Standards materials by using the Standards Certification Customer Library (SCCL) at ULstandards.com.
1.5 An evaluation of the adequacy of the controls and protective devices contained in an industrial control panel for supervision and proper functioning of the controlled loads or equipment is not covered by the requirements in this standard. Such evaluations are covered by the standards applicable to the complete piece of utilization equipment.
An industrial control panel is an assembly of standard and systematic arrangement of various components. It comprises overload relays, motor controllers, circuit breakers, and fused disconnect switches. Other related control devices include pushbutton stations, timers, switches, terminal blocks, and pilot lights, among others. According to the official definition by Underwriters Laboratories (UL), an industrial control panel is an assembly of two or more pieces of industrial control equipment. It also comes with related control circuit devices, provided with interconnecting wiring and terminals.
UL 508A certification is a directive for the industrial control panel covering components, SCCR, wiring, and more. This mark is important to electrical and municipal inspectors along with the panel purchaser. Therefore, engineers certified for the UL 508A standard advise their clients on how to design products with UL compliance. They also work with them to achieve a global design, hence eliminating the need for multiple variants.
IMPORTANT: A panel that carries a UL508A certified mark does not mean that the completed control panel has been tested to UL 508A standards. It means that the panel, it's electrical contents and construction each meet the UL 508A standard. UL also has general requirements for all enclosures convering:
UL 508A is a control panel standard that must be met by industrial equipment. The control panel design goes a long way in determining the safety and functionality of the machinery. In the construction of control panels, there are many factors to consider. Firstly, the panels must meet safety standards and regulations stipulated by the UL and National Electrical Code. Other provisions are NFPA and CSA. Apart from meeting the regulation standards, the panels must also be well constructed for the safety of workers.
With the 2022 update of UL 508A, the standard is now 100% aligned with NFPA 79 (and with IEC 60204-1) regarding the prescription for a Class A GFCI on all receptacle for general use. You find the new language in section 66.4.4.
The U.S. Access Board is responsible for developing Information and Communication Technology (ICT) accessibility standards to incorporate into regulations that govern federal procurement practices. On January 18, 2017, the Access Board issued a final rule that updated accessibility requirements covered by Section 508 and refreshed guidelines for telecommunications equipment subject to Section 255 of the Communications Act. The final rule went into effect on January 18, 2018.
The rule updated and reorganized the Section 508 Standards and Section 255 Guidelines in response to market trends and innovations in technology. The refresh also harmonized these requirements with other guidelines and standards both in the U.S. and abroad, including standards issued by the European Commission, and with the World Wide Web Consortium (W3C) Web Content Accessibility Guidelines (WCAG 2.0), a globally recognized voluntary consensus standard for web content and ICT.
SUMMARY: We, the Architectural and Transportation Barriers Compliance Board (Access Board or Board), are revising and updating, in a single rulemaking, our standards for electronic and information technology developed, procured, maintained, or used by Federal agencies covered by section 508 of the Rehabilitation Act of 1973, as well as our guidelines for telecommunications equipment and customer premises equipment covered by Section 255 of the Communications Act of 1934. The revisions and updates to the section 508-based standards and section 255-based guidelines are intended to ensure that information and communication technology covered by the respective statutes is accessible to and usable by individuals with disabilities.
DATE: This final rule is effective March 20, 2017. [Note: The Board changed the effective date to March 21, 2017, as indicated in a notice published on March 2, 2017.] However, compliance with the section 508-based standards is not required until January 18, 2018. Compliance with the section 255-based guidelines is not required until the guidelines are adopted by the Federal Communications Commission. The incorporation by reference of certain publications listed in the final rule is approved by the Director of the Federal Register as of March 20, 2017.
In this final rule, the Access Board is updating its existing Electronic and Information Technology Accessibility Standards under section 508 of the Rehabilitation Act of 1973, ("508 Standards"), as well as our Telecommunications Act Accessibility Guidelines under Section 255 of the Communications Act of 1934 ("255 Guidelines"). Given the passage of nearly two decades since their issuance, the existing 508 Standards and 255 Guidelines are in need of a "refresh" in several important respects. This final rule is intended to, among other things, address advances in information and communication technology that have occurred since the guidelines and standards were issued in 1998 and 2000 respectively, harmonize with accessibility standards developed by standards organizations worldwide in recent years, and ensure consistency with the Board's regulations that have been promulgated since the late 1990s. The Revised 508 Standards and 255 Guidelines support the access needs of individuals with disabilities, while also taking into account the costs of providing accessible information and communication technology to Federal agencies, as well as manufacturers of telecommunications equipment and customer premises equipment.
Section 508 of the Rehabilitation Act of 1973 (hereafter, "Section 508"), as amended, mandates that Federal agencies "develop, procure, maintain, or use" ICT in a manner that ensures Federal employees with disabilities have comparable access to, and use of, such information and data relative to other Federal employees, unless doing so would impose an undue burden. 29 U.S.C. 794d. Section 508 also requires Federal agencies to ensure that members of the public with disabilities have comparable access to publicly-available information and services unless doing so would impose an undue burden on the agency. Id. In accordance with section 508(a)(2)(A), the Access Board must publish standards that define electronic and information technology along with the technical and functional performance criteria necessary for accessibility, and periodically review and amend the standards as appropriate. When the Board revises its existing 508 Standards (whether to keep up with technological changes or otherwise), Section 508 mandates that, within six months, both the Federal Acquisition Regulatory Council (FAR Council) and Federal agencies incorporate these revised standards into their respective acquisition regulations and procurement policies and directives. Thus, with respect to procurement-related matters, the Access Board's 508 Standards are not self-enforcing; rather, these standards take legal effect when adopted by the FAR Council.
From the outset, one of the Access Board's primary goals in this rulemaking has been to increase harmonization with international standards relating to ICT accessibility that have been developed worldwide over the past decade. Some of these standards (such as WCAG 2.0) are incorporated by reference in the Revised 508 Standards and 255 Guidelines. For other standards (such as EN 301 549, which is the European accessibility standard for public ICT procurement), harmonization comes in the form of ensuring that the relevant accessibility specifications in such standard and the final rule can both be met simultaneously without conflict. Harmonization with international standards and guidelines creates a larger marketplace for accessibility solutions, thereby attracting more offerings and increasing the likelihood of commercial availability of accessible ICT options.
The Revised 508 Standards specify that all types of public-facing content, as well as nine categories of non-public-facing content that communicate agency official business, have to be accessible, with "content" encompassing all forms of electronic information and data. The existing standards require Federal agencies to make electronic information and data accessible, but do not delineate clearly the scope of covered information and data. As a result, document accessibility has been inconsistent across Federal agencies. By focusing on public-facing content and certain types of agency official communications that are not public facing, the revised requirements bring needed clarity to the scope of electronic content covered by the 508 Standards and, thereby, help Federal agencies make electronic content accessible more consistently.
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