What must be confirmed for circuits supplying receptacles in terms of amperage?

For circuits supplying receptacles, the most common requirement is that they should be rated at 20 amps. This is particularly true for general-purpose circuits in residential settings, where 20-amp circuits are designed to safely handle a greater load compared to 15-amp circuits. The National Electrical Code (NEC) stipulates that 20-amp circuits are required for receptacles in specific areas, such as kitchens and dining rooms, to accommodate the use of multiple devices drawing higher currents.

When circuits are rated at 20 amps, they can support appliances and equipment that may require more power without risking overload. This is essential for safety, ensuring that wiring and circuit breakers are adequately matched to the expected load, preventing overheating and potential electrical fires.

In residential circuits, while there may be exceptions (for instance, 15-amp circuits for some outlets in specific applications), adhering to the 20-amp standard is recommended for broad applicability to a variety of receptacle needs. Therefore, the correct answer emphasizes the typical requirement for receptacles to operate safely under higher load conditions while supporting common household devices.