What determines the required supply from branch circuits for lighting and appliances, and does this include motor-operated appliances?

• A. Calculated loads
• B. Nominal nameplate ratings
• C. Fixed standard values
• D. System voltage

Answer: (A)

The sizing of branch-circuit supply for lighting and receptacles is governed by calculated loads. You estimate the expected wattage of all connected lighting, outlets, and fixed appliances, apply any applicable NEC demand factors, and size the branches from that total. Motor-operated appliances are not ignored—their load should be included in the calculation, but large motors often fall under separate motor-dircuit rules (Article 430) and may require dedicated circuits. In short, branch-circuit sizing uses calculated loads, with motor-driven devices accounted for within those calculations per the applicable motor rules.