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Spurs: fused and unfusedWhat can a spur off a ring actually feed?
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A branch taken from the ring through a fused connection unit (FCU).
- The number of fused spurs is unlimited.
- The FCU fuse is 13 A maximum (it can be 3 A or 5 A), so the cable after it can be smaller, e.g. 1.5 mm² to a light or a shed.
- It can feed fixed equipment such as a hand dryer, a towel rail or an unswitched appliance socket.
A branch taken straight from a socket (or a junction box) with no fuse.
- The cable must be the same size as the ring (2.5 mm²).
- The number of unfused spurs must not exceed the number of socket-outlets on the ring.
- Only one spur from each socket, and you can't spur off a spur.
On-Site Guide · Appendix H · H2.4 Spurs (fused unlimited, unfused ≤ number of sockets) · p.219
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- Building Regs
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- Fundamental Inspection & Testing
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