A couple of exceptions to what has been posted before by George and John.

Referring to OSHA section 1910.399:

"With respect to an installation or equipment of a kind which no nationally 
recognized testing laboratory accepts, certifies, lists, labels, or determines 
to be safe, if it is inspected  or tested by another federal agency, or by a 
state, municipal, or other local authority responsible for enforcing 
occupational safety provisions of the National Electrical Code as applied in 
this Subpart, or:

With respect to custom-made equipment or related installations which are 
designed, fabricated for, and intended for use by a particular customer, if it 
is determined to be safe for its intended use by its manufacturer on the basis 
of test data which the employer keeps and makes available for the inspection to 
the Assistant Secretary or his authorized representatives."

The first part will probably boil down to the same thing, get an NRTL to accept 
the product.  The second part is much more flexible, but limits it to a 
"particular customer".  An excercise in Risk Management if you pursue that 
approach.

Regards,
Eric Petitpierre
Pulsecom
Herndon, VA



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