What is the minimum requirement for a residential electrical service in terms of amperage and voltage configuration?

The minimum requirement for a residential electrical service is 100 amps with a 240/120 volts configuration. This standard has been established to ensure that homes have sufficient power to support basic electrical needs and appliances, which continuously evolve in power requirements.

In a typical residential setup, the 240/120 volts configuration allows for the use of both 120-volt circuits, which are used for standard household appliances and lighting, as well as 240-volt circuits, which are often required for larger appliances like electric ranges and dryers. The 100 amps capacity is generally considered adequate for modern homes, providing enough power to operate essential devices safely while leaving room for expansion or the addition of more electrical loads.

This configuration also aligns with the National Electrical Code (NEC), which sets forth requirements for residential service to enhance safety and reliability.