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What is the size of the grounding wire for the temporary distribution box

Optical access and telecom site reference Published 30 Sep 2025

Use this reference to prepare product questions for CGWEB NETWORKS. Check interfaces, capacity, protection and installation requirements against the current product documentation.

The size of the grounding wire for a temporary distribution box depends on the overcurrent protection device rating, typically following NEC Table 250. 122, with copper EGCs ranging from #14 AWG for 15A circuits up to #2 AWG for 200A circuits. Key Considerations1.

Equipment Grounding Conductor (EGC) Sizing The grounding wire that runs with the circuit conductors in a temporary distribution box is called the equipment grounding conductor (EGC). Its purpose is to provide a low-impedance path for fault current, ensuring that protective devices trip quickly to prevent shock or fire hazards. 2.

NE

C Table 250. 122 The NEC specifies minimum EGC sizes based on the rating of the overcurrent protection device (OCPD), not the wire ampacity. For example: 15A–20A breaker: #14 AWG copper30A breaker: #10 AWG copper60A breaker: #10 AWG copper (upsized if voltage drop or long runs)100A breaker: #8 AWG copper200A breaker: #2 AWG copper 3.

Material Considerations

Copper is the most common choice for temporary distribution boxes. Aluminum conductors require one or two AWG sizes larger than copper to achieve equivalent conductivity. 4.

Voltage Drop and Distance For long runs, the EGC may need to be upsized proportionally to the phase conductors to maintain low impedance and effective fault clearing. For instance, if a 60A circuit uses #6 AWG copper for voltage drop control, the EGC may need to be upsized from #10 AWG to #8 AWG. 5.

Temporary Installations Even for temporary setups, the grounding conductor must be installed with the circuit conductors in the same cable or raceway to ensure a reliable fault path.

Oversizing the EG

C is acceptable and can improve safety without violating code.

Practical Example

If you have a 100A temporary distribution box using copper conductors: Standard EGC per NEC Table 250. 122: #8 AWG copperIf the feeder is long and upsized to #3 AWG for voltage drop, the EGC should be upsized proportionally, typically to #6 AWG copper.

Summary

Determine the OCPD rating for the temporary distribution box.

Use NE

C Table 250. 122 to select the minimum EGC size.

Upsize the EG

C if phase conductors are upsized for voltage drop or long runs. Use copper unless aluminum is required, adjusting size accordingly.

Ensure the EG

C runs with all circuit conductors in the same raceway or cable. Following these guidelines ensures code compliance, safety, and effective fault protection for temporary electrical installations.

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What is the size of the grounding wire for the temporary distribution box

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