What is the minimum service capacity required for a one-family dwelling?

The minimum service capacity required for a one-family dwelling is 100 amps. This standard is established to ensure that the electrical system in a typical residential setting can safely handle the normal load of electrical appliances and devices used by a family.

A 100-amp service is generally sufficient for most one-family residences, accommodating basic needs such as lighting, general appliances, and plug-in devices. It allows for the electrical load that can arise from everyday usage without overloading the system, which could lead to electrical failures or fire hazards.

This capacity also provides room for future expansions or the addition of high-draw appliances, offering a safety margin. Higher capacities like 150 amps or 200 amps are more common in larger homes or those with specialized electrical needs, but for a standard one-family dwelling, 100 amps is the minimum requirement as set by electrical codes.