Which statement defines "service entrance"?

Question

Options

• AThe switchgear delivering AC power to a UPS
• BThe secondary side of a transformer at 208 V or 230 V
• CThe point at which power is distributed from a panel board to a receptacle or local power distribution within an IT enclosure
• DThe point where the responsibility of the electrical power infrastructure shifts from the utility company to the owner or tenants of the building

• A
  14% (4)
• B
  3% (1)
• C
  7% (2)
• D
  76% (22)

Explanation

Option D is correct because "service entrance" is defined as the demarcation point - the boundary where the utility company's ownership and responsibility for the electrical infrastructure ends and the building owner's or tenant's responsibility begins. This is a legal and technical handoff point, typically at the meter or main disconnect. Option A describes downstream UPS-feeding switchgear, which is already inside the facility and well past the utility boundary. Option B describes a transformer's secondary output voltage, which is a characteristic of equipment inside the building, not a handoff point. Option C describes the last leg of distribution from a panelboard to an outlet or IT enclosure, which is the furthest point downstream from the service entrance - essentially the opposite end of the power chain.

Memory tip: Think of "service entrance" like the front door of a building - it is where outside responsibility (the utility) stops and inside responsibility (the owner) begins. Everything past the door is yours to manage.

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