Sizing the neutral conductor only for normal unbalance current may lead to a conductor that is too what?

When sizing the neutral conductor, it is essential to consider not just the normal unbalanced current, but also any potential fault conditions or unexpected loads that may arise. The purpose of the neutral conductor is to carry the unbalanced load in a multi-phase system, and if it is sized solely based on normal operating conditions, it might not accommodate situations where additional current flows through it.

If the neutral is sized only for normal unbalanced current, there may be scenarios—such as a fault in the system or unexpected surges—where the actual current exceeds this sizing parameter. This could lead to a neutral conductor that is too small, resulting in overheating, excessive voltage drop, or even a risk of electrical failure in the system during peak loads.

Thus, proper sizing should also consider potential unbalanced currents during fault conditions, ensuring that the conductor can handle not just the steady state but also transient conditions effectively. This approach ensures safety and reliability in electrical systems as outlined by the National Electrical Code (NEC) standards.