With three 3/0 AWG conductors in one conduit, what is the minimum size main bonding jumper that can be installed?

To determine the minimum size main bonding jumper when three 3/0 AWG conductors are installed in a conduit, one must refer to the National Electrical Code (NEC) guidelines, specifically those pertaining to bonding jumpers.

The NEC provides specific tables that outline the minimum bonding jumper sizes based on the largest ungrounded conductor in the service or feeder. When dealing with 3/0 AWG conductors, the appropriate reference would typically be to Table 250.102(C) which focuses on the sizing for bonding jumpers.

For three 3/0 AWG conductors, the minimum size of the main bonding jumper is determined by the fact that this size conductor correlates to a requirement reflected in NEC standards. The bonding jumper must be large enough to ensure adequate safety and fault current path for grounding purposes, allowing it to effectively bond the grounding system.

As per the NEC, the minimum size of the main bonding jumper for an ungrounded conductor of this size is typically 4 AWG copper. This size ensures that the bonding jumper can handle potential fault currents effectively, thereby providing a safe electrical environment.

Knowing this, one can confirm that the correct choice aligns with NEC requirements, specifically for three 3/0 AWG conduct