In general, a building or structure shall be supplied by only ___ service(s).

In general, a building or structure shall be supplied by only ___ service(s).

• A. one
• B. two
• C. three
• D. as many as directed

Answer: (A)

A building is normally fed from a single service entry. This creates one point of control for protection and disconnects, which simplifies coordination of overcurrent protection, metering, and grounding. With one service, all load currents pass through one main disconnect and share a common grounding system, reducing the risk of backfeeding and complex interconnections. There are code provisions that allow more than one service in certain situations (such as separate structures or special arrangements with proper coordination and metering), but the general rule is one service. Choosing more than one service would introduce multiple disconnects, separate metering schemes, and more complex grounding and protection requirements, which is why one service is the standard answer.

A building is normally fed from a single service entry. This creates one point of control for protection and disconnects, which simplifies coordination of overcurrent protection, metering, and grounding. With one service, all load currents pass through one main disconnect and share a common grounding system, reducing the risk of backfeeding and complex interconnections. There are code provisions that allow more than one service in certain situations (such as separate structures or special arrangements with proper coordination and metering), but the general rule is one service. Choosing more than one service would introduce multiple disconnects, separate metering schemes, and more complex grounding and protection requirements, which is why one service is the standard answer.