The NEC WikiSpecial Conditions
Energy Storage Systems Informational Note: MID functionality is often incorporated in an interactive or multimode inverter, energy storage system, or similar device identified for interactive operation. Part I. General Scope. This article applies to all permanently installed energy storage systems (ESS) operating at over 50 volts ac or 60 volts dc that may be stand-alone or… read more »
Interconnected Electric Power Production Sources Part I. General Scope. This article covers installation of one or more electric power production sources operating in parallel with a primary source(s) of electricity.Informational Note: Examples of the types of primary sources include a utility supply or an on-site electric power source(s). Definitions.Interactive Inverter Output Circuit. The conductors between the interactive inverter and the… read more »
Optional Standby Systems Part I. General Scope. The provisions of this article apply to the instal‐ lation and operation of optional standby systems.The systems covered by this article consist of those that are permanently installed in their entirety, including prime ARTICLE 702 — OPTIONAL STANDBY SYSTEMS movers, and those that are arranged for a connection to… read more »
Legally Required Standby Systems Part I. General Scope. The provisions of this article apply to the electri‐ cal safety of the installation, operation, and maintenance of legally required standby systems consisting of circuits and equipment intended to supply, distribute, and control electric‐ ity to required facilities for illumination or power, or both, when the normal electrical… read more »
Emergency Systems Part I. General Scope. This article applies to the electrical safety of the installation, operation, and maintenance of emergency systems consisting of circuits and equipment intended to supply, distribute, and control electricity for illumination, power, or both, to required facilities when the normal electrical supply or system is interrupted.Informational Note No. 1: For further information… read more »