What is the minimum size main bonding jumper required for a 175-amp service panel with 2/0 conductors?

The minimum size main bonding jumper is determined by the size of the service conductors and the current-carrying capacity of the system. For a service panel that utilizes 2/0 conductors, the bonding jumper must be sized according to the specifications outlined in the National Electrical Code (NEC).

To calculate the minimum size for the main bonding jumper, one must reference NEC Table 250.102(C)(1), which provides guidance based on the size of the service conductors. In this case, since the service conductors are 2/0 copper, the code specifies that the bonding jumper must be a minimum size of 4 AWG copper for a service of 175 amps.

Using this standard ensures that the bonding conductor is sufficient for providing an effective path for ground fault currents, helping to maintain system integrity and safety. Thus, in a scenario with a 175-amp service and 2/0 conductors, the minimum size main bonding jumper necessary is indeed 4 AWG.