What section of the NEC states that all listed or labeled equipment shall be installed or used in accordance with any instructions included in the listing or labeling?

• A. 110.3B
• B. 110.3A
• C. 110.2
• D. 110.1

Answer: (A)

The main idea here is that equipment that has been listed or labeled has been tested under certain conditions and installation methods, and the code requires you to follow those specific instructions to keep the listing valid and ensure safe, proper operation. This directive is stated in the part of the NEC that deals with listed or labeled equipment, where it says the equipment shall be installed and used in accordance with any instructions included in the listing or labeling. Following those directions makes sure you aren’t compromising the approval the device carries, including mounting, environmental limits, wiring methods, clearances, and other tested parameters. The other sections around it cover general scope and requirements, but they don’t contain this explicit instruction to adhere to the listing’s instructions.