Article 100 General: Solidly Grounded

This article was posted 10/06/2006 and is most likely outdated.

Subject - Article 100 General: Solidly Grounded

October 6, 2006

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Article 100
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General

Solidly Grounded

The term “solidly grounded” was contained in 230.95, but it was relocated to Article 100 because it’s used in at least eleven articles.
Grounded, Solidly.The intentional electrical connection of one system terminal to ground.
Author’s Comment: In reality, solidly grounded means the bonding of the system to the metal case of the derived system in accordance with 250.30(A)(1). Figure 100-4

Figure 100-4
(Click on image to enlarge)

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Comments

The term "solidly grounded system" when applied to a source of electrical distribution is defined as a system where the neutral is used as a circuit conductor.

A three-phase service feeding only three-phase motors and no phase to neutral loads would not be considered a "solidly grounded system" even though the derated neutral conductor is installed with the service phase conductors .

Mark Bodek

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