![]() ![]() Generally though, large companies will have insurance underwriters who will insist on it, so it becomes a company standard. It rarely happens, but Ive seen them make an example of people a couple of times, usually grossly negligent. OSHA will not force you to follow the standards, but if you DONT and there is an accident that they think would have been preventable had you followed it, you could be CRIMINALLY prosecuted for negligence. Nobody enforces NFPA79 standards, but they are considered a reference standard by OSHA when developing and maintaining an employers REQUIRED program of electrical safety, just as NFPA 70E is a reference standard. One of the listed ways that you can ATTAIN a valid SCCR label is by following UL508A Supplement SB2, which is available to UL 508A shops. So starters, panelboards, load centers, MCCs, control panels etc. ![]() In addition to that state-by-state NRTL requirement, Article 110 and 409 of the NEC also now mandate SCCR values be listed shown on electrical equipment that has line power components. UL is ONE of the NRTLs on that list and ostensibly the most well known, but not the only one. So for example here in California, we have the California Electric Code, which is basically a document adopting a VERSION of the NEC (we just adopted the 2014 NEC this year) and ammending it with other specific requirements. I think if you comply with both docs then your job at the far end during project sign off will be a lot easier. I think when i was doing unit operation machines that this was a kind a of bible. NFPA 79 is also a standard for machinery with control panels. ![]() ![]() You also have UL listed sub assemblies which is another discussion where UL sticker was given to a manufacturer on a product line when multiply components are used together. If you UL list your panel and sell into USA then its a lot easier for a local electrical inspector to sign off on the local installation. I would also have the panel built by a UL listed shop, then you can have the added sticker on the panel as UL listed by panel shop. UL also specifies any heat producing components have proper spacing. But what if the control panel will be installed as part of a piece of industrial machinery as defined in Article 670.2 Does this then mean that the control panel construction must follow the requirements in NFPA 79 as well Or does NFPA 79 just govern the installation of these control panels Its not clear to me if NFPA 79 is mandatory, and if so, when. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2023
Categories |