Final answer:
The smallest size allowed for the service entrance equipment for a single-family residential with a computed load of 8 KVA on a 240-volt single-phase system is typically 100 amperes, as per standard residential service sizes, though it's important to check the latest NEC and local codes for specific requirements.
Step-by-step explanation:
The question relates to determining the smallest size allowed for the service entrance equipment for a single-family residential with a computed load of 8 KVA and six branch circuits, with a voltage of 240 volts, single phase. The National Electrical Code (NEC) specifies the minimum requirements for sizing electrical services and equipment. According to NEC Article 220, the computed load sets the foundation for determining the service size. Additionally, there is typically a minimum service size specified by local codes and utility companies, often 100 amperes for residential services.
To find the minimum service entrance equipment size, you would typically multiply the total load (in this case, 8 KVA or 8000 VA) by the voltage (240 volts) to get the current, and then choose a service rating that can safely handle this calculated current with consideration to any additional safety factors required by code.
In this hypothetical scenario, 8000 VA / 240 volts = ≈33.33 amperes. Considering standard residential service sizes, the minimum size typically provided is 100 amperes, which would be more than sufficient for the mentioned load. It's important to always consult the latest NEC and local building codes for precise requirements and verified calculations.