Hi Dave:


>   Does this apply to in-house test equipment? That is, equipment that is
built
>   in-house and remains on site? In the past I have designed in-house
equipment
>   to meet the safety standards but did not send the equipment out for testing
>   and certification.

Yes.

If you check with your local electrical code inspectors
(or, if you have one, your in-house electrician ), you 
will find that custom-built equipment used in your
factory or site must meet the electrical code, which 
means it must be certified for safety.

Many of the certification houses offer on-site 
investigations of such equipment.  UL has a standard
(I don't recall the number) for such equipment.  Upon
successful completion of the investigation, the cert
house will put a sticker on the equipment, and the 
electrical code inspector will accept the equipment.

(Such certification also protects your employer against 
violation of OSHA rules.)


Best regards,
Rich





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