What does the NEC state about installing listed or labeled equipment?

The National Electrical Code (NEC) specifies that listed or labeled equipment should be installed according to the instructions provided by the manufacturer. This requirement ensures that the equipment is used in a manner consistent with its design and safety standards, which is crucial for maintaining compliance and ensuring safety. Following the manufacturer’s instructions helps to prevent misuse that could lead to malfunction or hazards, and it supports the warranty and insurance coverage associated with the equipment.

Installing electrical equipment without adhering to the manufacturer's guidelines may lead to improper connections, overloading, or potential safety risks, which could ultimately violate electrical codes and regulations. Ensuring that installations follow prescribed instructions is a key practice in maintaining safety and reliability in electrical systems.