Electrician's Licensing Practice Exam

What is the maximum distance a receptacle can be from an air-conditioning unit according to NEC?

1. 15 feet

2. 20 feet

3. 25 feet

4. 30 feet

The correct answer is: 25 feet

According to the National Electrical Code (NEC), the maximum distance a receptacle can be from an air-conditioning unit is specified to ensure safe and efficient operation of the unit. This distance is set to minimize the risks associated with the use of extension cords or other temporary power solutions that may be necessary to operate the unit. By establishing a limit of 25 feet, the NEC provides a guideline that balances accessibility for power needs while also minimizing the potential for safety hazards that can arise from longer distances where improper extension cords might be used. This distance helps ensure that the receptacle is close enough to the air-conditioning unit to allow for optimal power connection without overextending cords, which could lead to insulation wear, overheating, or increased resistance in the wires. In contrast, the other distances listed are not appropriate according to the NEC standards, as they do not provide the same level of safety or convenience that the 25-foot guideline offers.