According to the 25' tap rule, what is the minimum ampacity of tap conductors connected to feeders protected by a 125-ampere circuit breaker?

The 25' tap rule, found in the National Electrical Code (NEC), states that for conductors that are tapped to feeders, the ampacity of the tap conductors must be sufficient to handle a specific percentage of the rating of the overcurrent protection device. In this case, when a tap is made from a feeder protected by a 125-ampere circuit breaker and is less than 25 feet in length, the minimum required ampacity of the tap conductors is 1/3 of the rating of the overcurrent protection device.

To calculate this, you take 125 amperes and divide it by 3, which equals approximately 41.67 amperes. This value indicates that a tap conductor must have at least this amount of ampacity to ensure safety and compliance with the NEC. Thus, choosing the option of 41.67 amperes aligns with the established electrical safety standards by ensuring that the conductors can carry the load without overheating or being a potential hazard.