Is Informative Annex C considered a requirement of the NEC?

Informative Annex C of the National Electrical Code (NEC) serves as a resource for additional information and guidance but is not considered a mandatory requirement. Its purpose is to provide explanations, examples, and suggestions that can assist in understanding various provisions of the NEC, but it does not impose any binding requirements that must be followed.

The distinction here is significant. While certain sections of the NEC hold enforceable power, relying on mandate language such as "shall" or "must," Informative Annex C does not use this language and thus does not carry the same weight as the mandatory code sections. Instead, it can be seen as guidance intended to enhance understanding and facilitate implementation of best practices within electrical installations, while still allowing flexibility and professional judgment in application.

This non-mandatory status is what confirms that the correct answer to the question is that it is not a requirement of the NEC.