Unused Openings.

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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. Unused openings not covered. [110.12(A) and 408.7]

Circuit breaker knockouts and box/enclosure knockouts must be closed with approved knock out seals or plugs.

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Unused Openings.

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

Which of the following is true?

A: Any material may be used to close unused openings in electrical boxes.
B: Blank spaces in the deadfront of a panelboard shall only be closed by the use of a spare circuit breaker.
C: Knockouts in boxes may be closed by the use of electrical tape.
D: Blank spaces for circuit breakers must be closed.
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