What should the minimum size conductor be used for neutral connections?

The minimum size of conductor for neutral connections is primarily determined by the allowable ampacity based on the load and the specific application. In most residential and commercial electrical systems, the National Electrical Code (NEC) outlines that the neutral conductor should not be smaller than the minimum size of the ungrounded conductors carrying the same load.

In many situations, for a common installation, a #4 conductor is suitable as it provides adequate capacity for typical loads while also maintaining safety and efficiency. This ensures that the neutral can carry the same amount of current as the other conductors in a balanced load scenario without overheating or causing any safety issues.

Utilizing a #4 conductor for the neutral also accommodates for potential temporary increases in current due to inrush or load variations, ensuring compliance with electrical standards and providing reliability in the electrical system.