What is the minimum required size of the neutral in each conduit if the supplied loads will not exceed 310 amps?

The minimum required size of the neutral conductor is determined based on the ampacity of the wire, particularly in relation to the anticipated loads in a circuit. For a load that does not exceed 310 amps, it's important to refer to the National Electrical Code (NEC) guidelines and tables for wire sizing.

In this case, using 350 AWG or kcmil for the neutral size is appropriate because it ensures adequate capacity to safely handle the potential load without overheating. This size provides a margin of safety above the maximum intended load, which is crucial in electrical installations for preventing failure, maintaining efficiency, and ensuring overall safety.

Larger conductors are also better suited for dissipating heat generated by the electrical current flowing through them. In addition, having an appropriately sized neutral conductor can help manage the return currents and minimize any imbalances in the electrical system. Overall, maintaining a neutral size that aligns with the load requirements significantly contributes to the reliable functioning of the electrical system.

The other choices would be inadequate for handling the load of 310 amps, as they do not ensure the required ampacity or safety factor recommended in the NEC. Thus, the selection of 350 AWG or kcmil as the minimum size is in alignment with the