What is the minimum ampacity requirement for home branch circuits?

The minimum ampacity requirement for home branch circuits is specified to ensure safety and adequate power delivery for residential applications. A minimum of 15 amps is established for general purpose branch circuits, which are typically used for lighting, receptacle outlets, and small appliances. This standard helps to ensure that everyday electrical devices can be used without the risk of tripping breakers or overheating wiring.

The 15-amp standard is sufficient for most residential needs, particularly for outlets servicing general lighting and small appliances. While there are applications that may require higher ampacity, such as dedicated circuits for large appliances like refrigerators or air conditioners, the general requirement for home branch circuits starts at 15 amps. Understanding this fundamental requirement is crucial for any electrical work in residential settings to ensure that circuits are properly designed to handle expected loads safely.