Hint: Extension cord catastrophe
The power supply cord for this window-mounted sign is plugged into an extension cord, otherwise known as a cord set, with its factory-installed cord cap cut off, and hard-wired into the weatherproof box. The extension cord is covered by the white cord covers, which are attached to the building. There is no cord connector on the box. Instead, the cord and cord covering are simply shoved through a box opening and covered with tape.
Section 400.12 has restrictions on using cord sets and power supply cords. List item (1) in Sec. 400.12 prohibits using them as a substitute for the fixed wiring of a structure. Item (4) prohibits using them where attached to building surfaces. The lack of a cord connector in the box could cause the weight of the cord to put a strain on any conductor splices inside the box creating a violation of Sec. 400.14. Cutting off the factory-installed cord cap and misusing an extension cord in this manner would also be a violation of Sec. 110.3(B).
