A public building has a service entrance conductor with a rating of 600 amperes. What is the minimum grounding electrode conductor size required?

Texas Master exam practice question · Services & Derived Systems

A public building has a service entrance conductor with a rating of 600 amperes. What is the minimum grounding electrode conductor size required?

3/0 AWG
B4/0 AWG
C250 kcmil
D300 kcmil

Exam tip

Be aware of the grounding electrode conductor requirements based on the service entrance conductor rating.

Why A is correct

According to 2026 NFPA 70 NEC, a service entrance conductor with a rating of 600 amperes requires a grounding electrode conductor of at least 3/0 AWG. Option B is incorrect as it is too large. Options C and D are incorrect as they are sizes suitable for different conductor ratings.

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A public building has a service entrance conductor with a rating of 600 amperes. What is the minimum grounding electrode conductor size required?

A public building has a service entrance conductor with a rating of 600 amperes. What is the minimum grounding electrode conductor size required?

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