Unlisted LED window sign approvable?

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smallfish

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Detroit
As an electrical inspector I have come across an unlisted (by UL) and an unlabled LED window sign in a storefront window to a carry-out pizza parlor that I am inspecting.2005NEC Sec 600.3 requires listing and labeling of signs unless otherwise approved by special permission.
The sign is powered by a plug-in cord with a built in power supply UL approved, 120v.ac. to 12v.d.c. There is a port on the sign that accepts this cord's 12v.d.c. supply end.
How strictly should code rule 600.3 be applied?
Could the cord's built in power supply, which is not an integral part of the sign, be considered to be a power-limiting circuit supply, limiting maximum current flow on short or overcurrent, thereby protecting this sign and allowing the inspector to approve the use of this sign without a label?
Thanks
 
Probaly not the answer you want, but in most of our local jurisdictions, if a piece of equipment comes with a factory equipped cord and plug, we don't look for NRTL.
From a "safety" standpoint it might not make much sense, but trying to enforce what a customer plugs into an outlet is seemingly impossible.
Some local fire inspectors look for specifics on annual inspections, but no EI in this area looks at cord & plug equipment.
 
I think some people look for trouble where there is no need to.

While in a very technical way, this sign should be listed, the only thing that is going to happen if you gig the place for it is they are going to unplug it and remove it while you reinspect and then put it back in after you leave.
 
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