How to Wire a Fused Spur

A fused spur provides protection for a branch wire off a main circuit.
Wiring a fused spur provides protection for a small branch circuit.Wiring a fused spur provides protection for a small branch 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.

Step 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.

Step 2

Strip 3/8 inch of insulation off the three conductors in the supply and the branch wire with wire strippers.

Step 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.

Step 4

Wrap the black supply wire around the fused spur's supply live (L IN) terminal and tighten it down.

Step 5

Wrap the white neutral supply wire around the fused spur's supply neutral (N IN) terminal and tighten it down.

Step 6

Wrap the black branch wire around the fused spur's live out (L OUT) terminal and tighten it down.

Step 7

Wrap the white branch wire around the fused spur's neutral out (N OUT) terminal and tighten it down.

Things You Will Need

  • Noncontact voltage detector
  • Wire strippers
  • Screwdriver

Warning

  • Working around electricity has the potential to be very dangerous. If you don't understand safe electrical practices, hire an electrician to do the work.

About the Author

Bob White began his writing career in 2006. Working in sales, he was a technical writer tasked with responding to requests for proposal. White has a Bachelor of Arts in computer science and a diploma in home inspection. He has also worked in construction, landscaping and the pool industry for more than 15 years.