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Portable or mobile signs are covered by Section 600.10. The concern here is that because they're portable or mobile they may be installed in a variety of types of locations. If they are in a wet or damp location, they must have a ground-fault circuit interrupter. (GFCI)
Because the sign's location cannot be known with certainty – it could sometimes be outside and sometimes inside – portable and mobile signs are required to be protected by a ground-fault circuit interrupter that is installed at the factory.
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