Which part of the National Electrical Code's Article 110 does NOT apply to equipment on the supply side of a service point?

The correct answer indicates that Part I of Article 110 of the National Electrical Code (NEC) does not apply to equipment on the supply side of a service point. Part I generally deals with general requirements for electrical installations, which include aspects applicable to branch circuits and loads downstream of the service point. Therefore, its directives are primarily concerned with the distribution and use of electricity rather than the service entrance and supply side conditions.

In contrast, the other parts of Article 110 outline specific considerations and safety requirements that are relevant to various aspects of electrical installations, including those on the supply side. By identifying Part I as unrelated to supply-side equipment, it underscores the delineation in the NEC between general installation practices and those specifically tailored to the service point and upstream. Understanding this distinction helps in ensuring compliance with electrical safety standards that specifically govern how and where electrical equipment is installed and maintained.