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Thread: Emergency Lighting Circuits

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    Emergency Lighting Circuits

    Questions regarding 2017 NEC 700.20:


    1. What is the Code definition of an emergency lighting circuit?


    2. Does a branch circuit serving battery backed emergency egress lighting fixtures from a normal power panel board that also serves non-emergency lighting fixtures qualify as an emergency lighting circuit, or emergency branch circuit?

  2. #2
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    Quote Originally Posted by TexasEng2323 View Post
    Questions regarding 2017 NEC 700.20:


    1. What is the Code definition of an emergency lighting circuit?
    700.1 Scope. The provisions of this article apply 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.


    Quote Originally Posted by TexasEng2323 View Post
    2. Does a branch circuit serving battery backed emergency egress lighting fixtures from a normal power panel board that also serves non-emergency lighting fixtures qualify as an emergency lighting circuit, or emergency branch circuit?
    No
    The more they overthink the plumbing, the easier it is to stop up the drain

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    According to the main technical data of this type of emergency lighting, the rated voltage of the emergency light used is 2.4V, and the voltage at both ends of the battery is also 2.4V; the LED emergency light must be equipped with an emergency device - the inverter. The inverter converts DC power (battery, battery) into alternating current (typically 220v50HZ sine or square wave). Emergency power supply is generally to invert the DC battery into 220V AC. In general, an inverter is a device that converts direct current (DC) to alternating current (AC).

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