The general lighting load HP limit calculation is typically used to size which system components?

• A. Service equipment rating
• B. Branch-circuit breakers
• C. Conduit sizing
• D. Meter sockets

Answer: (A)

The main idea is that this HP-based general lighting load method is used to determine the required rating of the service equipment feeding the building. By expressing the general lighting load in horsepower and converting it to amperes, you find the minimum ampacity the service equipment (the main service panel or disconnect) must have to safely carry that load, plus any other connected loads. This sizing ensures the service can operate without overloading the main equipment. The other items are sized by different processes: branch-circuit breakers by individual circuit loads, conduit sizing by conductor ampacity and fill, and meter sockets by the service rating and utility requirements.