Normally, how many services will be permitted to supply a building or structure?

Normally, how many services will be permitted to supply a building or structure?

• A. Two
• B. One
• C. Three
• D. Unlimited

Answer: (B)

Normally, a building is supplied by a single service. The service is the set of conductors and equipment that brings utility power into the structure and includes the main disconnect that lets you shut off all power at once. Having one service provides a single point of control for safety, simplifies metering and protection coordination, and avoids the complexity and potential backfeed hazards that come with multiple service disconnects. While there are situations where more than one service might be used (such as separate structures or multi-tenant setups requiring separate feeds), the common, normal arrangement is one service.

Normally, a building is supplied by a single service. The service is the set of conductors and equipment that brings utility power into the structure and includes the main disconnect that lets you shut off all power at once. Having one service provides a single point of control for safety, simplifies metering and protection coordination, and avoids the complexity and potential backfeed hazards that come with multiple service disconnects. While there are situations where more than one service might be used (such as separate structures or multi-tenant setups requiring separate feeds), the common, normal arrangement is one service.