Article 100, Coordination, Selective (Selective Coordination).

Selective coordination ensures that the overcurrent device closest to the faulted circuit trips before an upstream overcurrent device can.
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Selective coordination ensures that the overcurrent device closest to the faulted circuit trips before an upstream overcurrent device can.

MA amendments.

Article 100, Coordination, Selective (Selective Coordination). Revise this definition to read as follows:

Localization of an overcurrent condition to restrict outages to the circuit or equipment affected for fault current events that extend beyond 0.1 second, and accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the range of available overcurrents under such conditions, whether originating from overload, ground-fault, or short circuit, and for the full range of overcurrent protective device opening times applicable to such events.

Click here to see the Massachusetts amendments to the 2023 NEC®.

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Article 100, Coordination, Selective (Selective Coordination).

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true of selective coordination as amended in Massachusetts?

A: Selective coordination applies to the full range of available overcurrents, from overload to the maximum available fault current.
B: Selective coordination is the localization of an overload condition to permit outages to the circuit or equipment affected.
C: Selective coordination is accomplished by the design of overcurrent protective devices and their ratings or settings.
D: Selective coordination applies to fault current events that extend beyond 0.1 second.
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