Within the UL A standard, there are two sections that are more relevant to outdoor enclosures and cabinets. All rights reserved. Terms and Conditions of Use Sitemap. Wireless Telecommunications. Wireline Networks. Technical Support. Field Services. White Papers. Company Overview. Environmental and Quality Policy. Supply Chain Management. Press Releases. UL A Certified Enclosures Benefits of selecting an enclosure or cabinet that carry the UL A certification include: UL A certification provides the inspection authority and your customer evidence that the control panel complies with nationally recognized safety standards.
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Get more information about how UL A affects you, how to select a short circuit current rating, and understanding UL A. The intent of Article is to prevent the misapplication of control products and related equipment. This article will provide the minimum requirements to ensure safe installation and inspection of industrial control panels.
Article covers industrial control panels that are intended for general use and operate at a voltage of V or less. This document gives guidelines to panel builders on various issues including proper component selection, wiring methods and calculation of short circuit current ratings.
Upon successful inspection, the panel would bear the UL label. A UL label signifies that the panel builder has met the requirements of ULA, and that their panels are subject to inspection by UL field representatives. Not every panel is inspected by UL, but panels are subject to inspection by UL depending upon the quantity of UL Labeled panels made in a give time period.
If the panels are found to be in compliance, they are permitted to continue production and apply the UL Label. The NEC is the code accepted by most inspection agencies in the United States for safe installation of electrical equipment.
This code is updated every 3 years, and typically takes years before code enforcement begins. For instance, many cities still use the NEC as a basis for their electrical code. Even if a manufacturer follows all of the guidelines implemented by UL at the time of manufacturing, the panel may not meet the requirements of the NEC, which are enforced by local electrical inspectors.
For instance, the National Electric Code requires that equipment be labeled with the Short Circuit Current Rating, and that the SCCR of the equipment exceed the available short circuit current at the point of installation.
There may be situations, where an inspector will not allow the installation of this panel, even though it carries a valid UL listing. Many customers have been surprised by these changes, and by helping our customers understand the code, Eaton can help prevent costly errors and frustration.
A UL listed component bears the UL listing mark and has been subject to testing.
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