Which of the following is NOT included in the allowed connections on a 15-amp branch circuit?

In a 15-amp branch circuit, the National Electrical Code (NEC) allows for a variety of devices to be connected, but there are limits regarding the types of connections to ensure safety and proper circuit load management.

The reason hard-wired equipment exceeding 7.5 amps is not allowed on a 15-amp branch circuit is that it could potentially overload the circuit. A 15-amp circuit is designed to handle a maximum load of 15 amps, and when hard-wired equipment draws more than 7.5 amps, it gets dangerously close to the circuit's capacity. If multiple devices or equipment exceed this threshold collectively, it can lead to overheating of the wiring and potential fire hazards.

On the other hand, lighting units typically draw low power, making them suitable for a 15-amp circuit. Cord-and-plug connected equipment that is fastened in place is also acceptable as long as it does not exceed the circuit's capacity. Distribution receptacles are generally set up to serve the load intended, adhering to proper load calculations, which is why they are included as allowed connections. These aspects illustrate the importance of not exceeding the rated capacity of a circuit to maintain safety and functionality.