Which point marks the boundary between service wiring and premises wiring?

Which point marks the boundary between service wiring and premises wiring?

• A. Junction point
• B. Interface
• C. Demarcation point
• D. Main distribution

Answer: (C)

The boundary between service wiring and premises wiring is defined by the demarcation point. This point marks where the provider’s outside wiring ends and the customer’s inside wiring begins, making it the clear line of responsibility for maintenance and fault isolation. In practice, the demarcation point is often the Network Interface Device (NID) or a similar boundary device located on the customer’s side of the entry point. Beyond this point, the customer owns and maintains the internal wiring; before it, the service provider is responsible. Other terms don’t describe this ownership boundary. A junction point is simply where cables meet, not who is responsible for what. An interface is a general term for a boundary between two systems but doesn’t specify the service-provider versus customer boundary. Main distribution refers to the primary electrical distribution path, not the boundary between external service wiring and internal premises wiring.

The boundary between service wiring and premises wiring is defined by the demarcation point. This point marks where the provider’s outside wiring ends and the customer’s inside wiring begins, making it the clear line of responsibility for maintenance and fault isolation. In practice, the demarcation point is often the Network Interface Device (NID) or a similar boundary device located on the customer’s side of the entry point. Beyond this point, the customer owns and maintains the internal wiring; before it, the service provider is responsible.

Other terms don’t describe this ownership boundary. A junction point is simply where cables meet, not who is responsible for what. An interface is a general term for a boundary between two systems but doesn’t specify the service-provider versus customer boundary. Main distribution refers to the primary electrical distribution path, not the boundary between external service wiring and internal premises wiring.