How to Wire a Fused Spur

A fused spur provides protection for a branch wire off a main circuit. This branch is commonly a lower amperage circuit and thus requires its own fuse to protect the lower-gauge wires. This arrangement is commonly used in the United Kingdom and may not meet local building codes in North America. Consult with your municipal building authority before installing a fused spur in your home.

Noncontact voltage detector
Wire strippers
Screwdriver

Instructions

- 1
  Turn off the power for the circuit you are working on at the home's electrical distribution panel. Confirm the power is off by touching a noncontact voltage detector to the wire's insulation.
- 2
  Strip 3/8 inch of insulation off the three conductors in the supply and the branch wire with wire strippers.
- 3
  Loosen the ground screw in the back of the electrical box and wrap both green or bare wires around this screw. Tighten the terminal down with a screwdriver.
- 4
  Wrap the black supply wire around the fused spur's supply live (L IN) terminal and tighten it down.
- 5
  Wrap the white neutral supply wire around the fused spur's supply neutral (N IN) terminal and tighten it down.
- 6
  Wrap the black branch wire around the fused spur's live out (L OUT) terminal and tighten it down.
- 7
  Wrap the white branch wire around the fused spur's neutral out (N OUT) terminal and tighten it down.

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