In a healthcare facility, what is the minimum size of the grounding conductor required for a 120/208-volt, 3-phase, 4-wire service?

Texas Master exam practice question · Services & Derived Systems

In a healthcare facility, what is the minimum size of the grounding conductor required for a 120/208-volt, 3-phase, 4-wire service?

A3/4 inch
1 inch
C1 1/4 inch
D1 1/2 inch

Exam tip

Always refer to the specific voltage and phase configuration in the NEC when determining the minimum grounding conductor size.

Why B is correct

According to 2026 NEC 250.104(A), the minimum size of the grounding conductor for a 120/208-volt, 3-phase, 4-wire service is 1 inch. The other options are not specified for this voltage and phase configuration.

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In a healthcare facility, what is the minimum size of the grounding conductor required for a 120/208-volt, 3-phase, 4-wire service?

In a healthcare facility, what is the minimum size of the grounding conductor required for a 120/208-volt, 3-phase, 4-wire service?

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