UL listed panels (built in house)

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cornbread

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This may not be the best place to ask this question... but being old timer I'm going for it anyway. My question is building panels in house, where do you draw the line on have a panel UL listed. I talking mainly control panels, a few relay & PB's, may be a small PLC from time to time.
Back in the day... way...way back, I was lead to believe if you built a panel in house for your company's use and built it using UL listed parts... it was OK. Time they be a changing and the more I read the more I think I need to have every panel built by a UL listed panel shop. Back to my original question how much work can be done in house or farmed out to a expensive panel shop?
 
it is likely that it will cost you less to have it built by a panel shop than to do it yourself, but many places do not account for costs very well when this kind of thing is done in house.

IMo, if it is required to be listed, it does not matter whether you build it in house or not. it is still required to be listed.
 
I suppose it depends on what the panel is being used for.

The requirement for testing in the US is something that OSHA controls. With fire protection equipment, 29 CFR Subpart L addresses fire protection. Section 29 CFR 1910.155(c)(3) defines the meaning of "approved".

Essentially the equipment...
  1. Has to be listed by an NRTL...
  2. If there is no test standard for the equipment but the product is tested to another standard close to what needed...
  3. If it’s custom made for use by the manufacture, and test date is kept for inspection…

The above is a loose interpretation. Open the link and read the actual text to get a full understanding.
 
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