In a ring final circuit, how many non-fused spurs may be connected?

• A. One for each socket in the circuit
• B. One for the entire circuit
• C. Unlimited
• D. Up to four spurs

Answer: (A)

A non-fused spur is a branch off the ring final circuit that powers an outlet without its own protective fuse. The protection for that spur comes from the ring’s overcurrent device. Because each socket is an independent end load, you can derive a non-fused spur to feed each socket along the ring. So, in practice, you can have one non-fused spur for every socket in the circuit. The ring must be sized to handle the total load, but there’s no separate fuse in each spur. This is why the best answer is that the number of non-fused spurs is the same as the number of sockets on the ring.