HOLT Electricians Practice Exam

What is the maximum amperage for the attachment plug and receptacle at 250 volts for a cord-and-plug connected air-conditioning motor compressor?

1. 10 amperes

2. 15 amperes

3. 20 amperes

4. 25 amperes

The correct answer is: 15 amperes

In the context of electrical installations, particularly for cord-and-plug connected air-conditioning motor compressors, the National Electrical Code (NEC) specifies the maximum amperage ratings for attachment plugs and receptacles. For a 250-volt system, the maximum rated amperage for a residential or light commercial application is typically 15 amperes. This rating is in place to ensure safe operation and to prevent overheating of the wiring and equipment. Attachment plugs and receptacles rated for 15 amperes are standard for many household appliances and equipment, including smaller air-conditioning units, ensuring compatibility and safety in typical usage scenarios. Higher amperage ratings for plugs and receptacles, such as 20, 25, or more, are available but are typically intended for specific industrial applications or larger equipment that may require more power. Therefore, for most residential air-conditioning compressor setups at 250 volts, a 15-ampere plug and receptacle is the correct choice to ensure both safety and compliance with electrical standards.