NEC 700.3 (F): What does it say?

700.3 (F) is a new provision in NFPA’s 2017 National Electrical Code® (NEC®) for legally required systems. It requires provisions to be able to connect a temporary source of power fornec 700_3f diagram
emergency systems which rely on a single alternate source of power which will be disabled for maintenance or repairs. The emergency system shall include permanent switching means to connect a portable or temporary alternate source of power, which shall be available for the duration of the maintenance or repair.

The permanent switching means to connect a portable or temporary source of power shall comply with:

  • Connection to the portable or temporary source of power shall not require modification of the permanent system wiring.
  • Transfer of power between the normal and emergency sources shall not exceed 10 seconds (in accordance with NEC 700.12).
  • Mechanical or electrical interlocking shall prevent inadvertent interconnection of power sources.
  • The switching means shall include a contact point that shall annunciate at a location remote from the generator or at another facility monitoring system to indicate that the permanent emergency source is disconnected from the emergency system. It shall be permissible to utilize manual switching to switch from the permanent source of power to the portable source of power and to utilize the switching means for the connection of a load bank

The requirement of article 700.3 (F) applies to buildings such as: hospitals, healthcare, and public utility facilities.

*ESL’s TempTapOutTap, StomSwitch and TripleSwitch offer multiple solutions in order to comply with 2017 NEC 700.3 (F) updates based on your existing equipment. Contact our factory for assistance and additional details.



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