Question

A bare 4 AWG copper conductor installed near the bottom of a concrete foundation or footing that is in direct contact with the earth may be used as a grounding electrode when the conductor is at least 20 feet in length is called a _______.

Answer 1

It is called as

Ufer's ground.

Step-by-step explanation:

• Ufer ground is a method of grounding the electrical earth and it was used in World War II. This method is used in dry areas and in concrete foundations.
• For a 20 ft conductor, a bare 4 AWG copper conductor installed near the bottom of a concrete foundation or footing that is in direct contact with the earth which may be used as grounding electrode.