Are You Ready for the 2017 NEC Updates?

Have no fear, ESL is here! ESL’s TripleSwitch is 2017 NEC 700.3 (F) compliant when used in conjunction with an ATS.

According to 2017 NEC provision 700.3(F), legally required systems must be able to connect a temporary source of power for emergency systems which rely on a single alternate source of power which will be disabled for maintenance or repairs. It states, 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 repair1.

Watch our recent video to learn how the TripleSwitch has you covered!



  1. Source: NFPA’s 2017 National Electrical Code® Handbook


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2 thoughts on “Are You Ready for the 2017 NEC Updates?

  • August 18, 2017 at 7:40 am

    Is there a mechanical interlock that prevents both generator sources to be turned on at the same time?

    • August 18, 2017 at 12:59 pm

      Thank you for your question! Yes, ESL’s patented mechanical interlock prevents both generator sources from being turned on at the same time and also eliminates the need for kirk keys for manual transfer. Please feel free to contact our Emergency Power Customer Service Team at:


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