What is the minimum circuit size for general-purpose circuits in dwelling units?

The minimum circuit size for general-purpose circuits in dwelling units is established by the National Electrical Code (NEC). In residential settings, the code specifies that general-purpose branch circuits, which are used to provide power for receptacles and lighting, must have a minimum amperage rating of 15 amps. However, the guidelines also allow for circuits rated at 20 amps to be used for these purposes.

In typical applications where more load is expected, such as in kitchens or for multiple receptacles, a 20-amp circuit provides greater capacity and flexibility for the homeowner. This is particularly relevant in sections 210.11 and 210.23 of the NEC, which detail the requirements for branch circuit conductors and the need to accommodate various loads efficiently.

The option indicating a 20-amp minimum aligns with the NEC requirements for circuits serving kitchen and general-purpose areas, making it the most suitable answer in the context of ensuring adequate electrical supply for typical residential settings. Therefore, while 15 amps is common for many circuits, the minimum circuit size should be recognized as 20 amps for general-purpose circuits to ensure safety and compliance with the electrical code.