Generator Installations.

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Maine has additional state-specific resources including laws, rules, and most common electrical law violations based on the 2020 National electrical Code (NEC).

See below section or click on the following link to view all of the most common electrical violations in Maine: Common Law Violations

Common 2020 National Electrical Code Violations:

  1. At a generator installation with a service rated transfer switch incorporating a service disconnect overcurrent device the grounds and neutrals remain connected together in the subpanel (which used to be the service panel). [250.24(A)(5)

When a service overcurrent device (circuit breaker) is installed on the line side of the existing service panel that existing service panel becomes a subpanel and the grounds and neutrals in that panel must be separated.

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Generator Installations.

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

Which of the following is true for a generator installed in Maine with a service rated transfer switch, when a service overcurrent device (circuit breaker) is installed on the line side of an existing service panel?

A: The existing service panel must be removed.
B: That existing service panel becomes a new service which requires the grounds and neutrals to be removed.
C: That existing service panel becomes a subpanel and the grounds and neutrals in that panel must be connected together.
D: That existing service panel becomes a subpanel and the grounds and neutrals in that panel must be separated.
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