NEC Article 310 deals with conductors. Conductors are used on every electrical installation, so naturally we have a variety of installation conditions and a wide range of applications.
The 2012 edition of NFPA 70E added the term inspection in its scope, answering the question about whether or not 70E applies to electrical inspectors in the workplace.
Most residential electrical services are not designed to accept two sources of power, but they are often utilized for the purpose of connecting PV systems in addition to utility power.