For a one-family residence, the minimum size main service disconnecting means is ____ three-wire.

Question

Quizplus · Accepted Answer

According to the National Electrical Code (NEC) 230.79, the minimum rating for a main service disconnecting means for a one-family dwelling is 100 amperes. Furthermore, the NEC requires that the service disconnecting means be either a "three-wire" or "four-wire" type, depending on the specific installation. Therefore, the minimum size main service disconnecting means for a one-family residence is 100-ampere three-wire.

For a One-Family Residence, the Minimum Size Main Service Disconnecting