Jim,
The requirement comes from the US NEC article 100 under the
definitions Labeled and Listing and in article 110-2 & 3. The NEC Handbook
clearly states: The Code requires that all equipment be approved as defined
in Article 100 and, as such, be acceptable to the authority having
jurisdiction. OSHA has invoked this aspect of the code for industrial
equipment.
In the US the application of the requirement is left to local
electrical inspectors and to the commercial & consumer marketplace (big box
stores won't carry your product without Listing). [I usually wryly point
out that Americans are good at setting requirements but lax in enforcement -
until there's a problem.]
Canada has similar requirements in the CEC. The Canadians are more
aggressive about enforcement; I have worked with several clients who were
forced to seek certification after getting caught without it.
Save yourself a bunch of trouble later on and get it up front while
you can still affect the design and get the needed changes in place.
I hope that this helps.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Consultant
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
-
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