Concrete Encased Electrodes.

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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. Concrete encased electrode is not used where required. [250.50 and 250.52(A)(3)]

250.50 requires that all grounding electrodes present at a building shall be used. Concrete encased electrodes (Ufer Grounds) have been commonly used in commercial buildings for a long time. Most buildings now have rebar in the footings and this rebar is required to be used as a grounding electrode if it is over 20’ long. This is a far superior electrode and is very easy to install. A piece of rebar attached to at least 20’ of rebar can be brought up out of the foundation wall and there are also bond-outs now available that allow access to the rebar right next to the service panel.

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Concrete Encased Electrodes.

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

Which of the following is true of the grounding electrode system at a building?

A: All grounding electrode systems must utilize a ground rod.
B: If a 20-foot length of ½ inch or larger rebar is used in a footing that has direct contact with the earth, and that rebar is encased in at least 2 inches of concrete, it must be used as a grounding electrode.
C: All grounding electrode systems must utilize a ground ring.
D: If a 10-foot length of ½ inch or larger rebar is used in a footing that has direct contact with the earth, it must be used as a grounding electrode.
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