What is a spur circuit in domestic wiring?

• A. A loop that continues around the building
• B. A circuit that loops back to supply a transformer
• C. A short branch off a circuit to supply a small number of outlets or a single appliance, not part of a ring
• D. A dedicated circuit for the range cooker

Answer: (C)

A spur circuit is a short branch off an existing circuit that provides power to a small number of outlets or to a single appliance, and it is not part of the ring final circuit. In a typical domestic installation, the ring final circuit forms a continuous loop supplying many sockets around the home. A spur diverts a short length of cable from that circuit to add a few outlets or one appliance without reconfiguring the entire ring. This is different from a loop that runs around the building (the ring) and from a dedicated circuit meant for a high-load appliance like a range cooker.