No electrically illuminated sign shall be erected unless a permit has been issued
therefor. The applications for such permit shall contain complete specifications,
including ampere rating, proposed location, name of contractor making installation,
manufacturer's name and owner's name together with such additional information as
may be required to insure compliance with this code. Where a sign is completely enclosed
so that disassembly for inspection is not possible, the building official may accept
the seal of a certified testing laboratory in lieu thereof. The building official
shall certify and maintain a list of testing laboratories which test and rate electrically
illuminated signs according to the requirements of this code.