Sealing of Raceways.

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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. Not sealing underground raceways that enter buildings or portions of any raceway that is subject to different temperatures. [225.27, 230.8, 300.7 and 300.5(G)]

Sealing these raceways eliminates the movement of moisture laden air through the raceway which could result in condensation and corrosion of electrical parts.

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Sealing of Raceways.

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

Which of the following is true of the sealing of raceways?

A: The sealing of raceways is required at both ends of all branch circuit raceways.
B: The sealing of underground raceways is required at 10-foot intervals.
C: The sealing of underground raceways that enter buildings or portions of any raceway that is subject to different temperatures eliminates the movement of moisture laden air through the raceway which could result in condensation and corrosion of electrical parts.
D: Raceway seals are NOT required where an underground feeder raceway enters a building.
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