A commercial building has a single 120/208-volt, 3-phase, 4-wire service. What is the minimum grounding electrode conductor size required?

Texas Master exam practice question · Services & Derived Systems

A commercial building has a single 120/208-volt, 3-phase, 4-wire service. What is the minimum grounding electrode conductor size required?

1/0 AWG
B3/0 AWG
C4/0 AWG
D6/0 AWG

Exam tip

Be aware of the specific requirements for grounding electrode conductor sizes based on the type of service and voltage.

Why A is correct

According to 2026 NFPA 70 NEC, a 120/208-volt, 3-phase, 4-wire service requires a minimum grounding electrode conductor size of 1/0 AWG. Options B, C, and D are incorrect as they are larger sizes suitable for different voltage and current requirements.

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A commercial building has a single 120/208-volt, 3-phase, 4-wire service. What is the minimum grounding electrode conductor size required?

A commercial building has a single 120/208-volt, 3-phase, 4-wire service. What is the minimum grounding electrode conductor size required?

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