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.
Strip 3/8 inch of insulation off the three conductors in the supply and the branch wire with wire strippers.
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.
Wrap the black supply wire around the fused spur's supply live (L IN) terminal and tighten it down.
Wrap the white neutral supply wire around the fused spur's supply neutral (N IN) terminal and tighten it down.
Wrap the black branch wire around the fused spur's live out (L OUT) terminal and tighten it down.
Wrap the white branch wire around the fused spur's neutral out (N OUT) terminal and tighten it down.