When connecting a motor to a general-purpose branch circuit via an attachment plug and receptacle, what is the maximum rating allowed if individual overload protection is omitted?

The correct answer indicates that when connecting a motor to a general-purpose branch circuit without individual overload protection, the maximum allowable current rating for the motor is 15 amperes. This regulation is in accordance with electrical codes designed to prevent overheating and potential fire hazards due to overloads.

Motors, especially when started, can draw significantly more current than their running current; thus, the code specifies limits to ensure that any connected devices do not exceed the capacity of the branch circuit and the receptacle used. A 15 amp rating for motors recognizes that while the motor can operate under normal load conditions without causing issues, it also adds an element of safety by limiting the maximum current that can be drawn to a level that the circuit can safely handle, especially since overload protection is not in place.

Allowing higher ratings, such as 20 amperes, would potentially risk overheating the wiring and receptacle, as they might not be able to handle the higher load continuously without risk of damage. Therefore, the 15-amp limit balances operational capability and safety, ensuring that the motor can operate effectively without undue risk to the circuit.