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A bare 4 AWG copper conductor Installed horizontally near the bottom or vertically, and within that portion of a concrete foun dation or footing that is In direct contact with the earth, can be used as
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A bare 4 AWG copper conductor Installed horizontally near the bottom or vertically, and within that portion of a concrete foun dation or footing that is In direct contact with the earth, can be used as a grounding electrode when the conductor is at least __________ft in length.

User Arjuncc
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3.2k points

1 Answer

7 votes

Answer:

20 ft

Step-by-step explanation:

This is the length where the direct contact could be used as ground electrode

User Sam Judd
by
3.5k points
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