What is the minimum size copper equipment grounding conductor required for a branch circuit protected by a 60-ampere fuse?

The minimum size for a copper equipment grounding conductor is determined by the ampacity of the circuit protection in accordance with the National Electrical Code (NEC). For a branch circuit protected by a 60-ampere fuse, the NEC has established that the minimum size for the copper equipment grounding conductor should be based on the rating of the overcurrent protection device.

According to the relevant NEC tables, the grounding conductor must be sized correctly to ensure safety and effectiveness. In this case, a 60-ampere circuit typically requires a minimum copper equipment grounding conductor size of 10 AWG. This size effectively handles the fault current, ensuring that the grounding system is capable of clearing faults and providing a safe path for electric current in the event of a ground fault.

Choosing a size smaller than 10 AWG would not adequately meet the NEC's requirements for safety, as it would not provide sufficient conductivity to handle potential fault currents. Additionally, sizes larger than 10 AWG, while often acceptable, could exceed the minimum code requirements, which typically focus on the smallest size for safety and efficiency purposes.