The minimum size for feeder-circuit conductors should meet the requirement of noncontinuous load plus how much percent of the continuous load?

The minimum size for feeder-circuit conductors is designed to ensure that they can handle both continuous and noncontinuous loads safely and effectively. According to the National Electrical Code (NEC), feeder conductors must be sized to accommodate continuous loads plus a specified percentage of the continuous load to ensure they do not overheat during operation.

For continuous loads, which are defined as loads that will run for three hours or more, the NEC specifies that the feeder must be sized to handle 125% of the continuous load. This percentage is crucial because it addresses potential increases in current draw and helps maintain system reliability and safety.

In the context of the question, choosing the option that states 125% ensures that the conductors are adequately sized to handle both the continuous and noncontinuous loads effectively without exceeding their temperature rating, thus preventing possible overheating and reducing the risk of electrical failure.

This requirement is an important consideration for electricians and helps ensure compliance with electrical safety standards.