What is the maximum allowable load for a branch-circuit?

The maximum allowable load for a branch circuit is determined by the circuit's rating and the National Electrical Code (NEC) requirements. Each branch circuit is designed with a specific capacity, which is indicated by its ampacity rating, determined by factors like conductor size, insulation type, and installation conditions.

The correct choice emphasizes that the maximum load must be within both the rating of the branch circuit and the NEC’s load calculations, ensuring safety, performance, and avoiding overheating or failure of the circuit. The NEC sets forth guidelines for calculating the maximum load based on the branch circuit rating, ensuring that the load does not exceed what the circuit can safely handle.

Thus, maintaining the load within the prescribed limits of both the branch circuit's rating and the NEC's guidelines is crucial in preventing hazards such as electrical fires or equipment damage, which underscores the importance of this understanding in electrical practice.