What is the minimum size for a wire-type equipment grounding conductor when a feeder is installed in PVC conduit for a separate building or structure?

The minimum size for a wire-type equipment grounding conductor in a feeder installed in PVC conduit for a separate building or structure is determined by Section 250.122 of the National Electrical Code (NEC). This section outlines the requirements for equipment grounding conductors and specifically addresses the sizing based on the rating of the overcurrent device protecting the circuit.

When sizing the equipment grounding conductor, it is essential to consider the protection provided by the overcurrent device, as it ensures that the grounding conductor can safely carry the fault current back to the source in the event of a fault condition, thus trip the circuit breaker or fuse. Section 250.122 provides a clear guideline for determining the appropriate size based on the rating of this overcurrent protection.

The other options, while relevant to grounding and conductors, do not directly apply to the scenario of determining the minimum size for a wire-type equipment grounding conductor in the context described. Section 250.66 deals with the grounding electrode conductor sizing based on grounding electrode dimension, and Table 250.66 provides values for grounding electrode conductors. Table 310.16 relates to the ampacity of conductors, which is separate from equipment grounding considerations. Thus, the focus on Section 250.122 is crucial for