According to NEC, re should be no splices of wires outside of an enclosure that is approved. One type of such box is junction box. This box is a standard one securely fixed on a suitable structure and contains splice (wiring collection) of two or more wires or circuit cables. Cable clamps are used to secure cables to box. To come up with complete enclosure, there needs to be a removable cover on the junction box. The cover should be easily accessible and should not be drywall or surface material.

Supplies Required:

  • Wire connectors
  • Wood screws
  • Screwdriver
  • Clamps (Cable)
  • Hammer
  • Wire strippers
  • Drill driver and screwdriver trip
  • Non-contact voltage tester.
  • Pliers
  • Code-approved Electric box with cover
  1. Switch off power and test wires
    Ensure that power to the circuit you will be working on is turned off. This can be achieved by turning off circuit breaker in service panel of your home. Use a non-contact voltage tester to test all wires you will be operating on. This test will enable you to confirm that any of wires have no voltage present in m.
  2. Take out the knock out of a metal box.
    Remove knock out on the box for every cable that is supposed to enter the box. In case you are using a metal box. You can remove each knock out using a hammer and screwdriver n twists it off with pliers.
  3. Clamp Each Cable
    Just as required, install cable clamp for every cable. Reis no knockouts in standard plastic Electric boxes. However, y have internal cable clamps. Internal clamps may be present in Metal boxes. If re is none in your box, consider installing locknut-type clamp for every cable. Place end of camp that is threaded through A Knock out hole and fix clamp inside the box using the nut. Use pliers to tighten the nut.
  4. Mount Box
    Make room for new junction box by separating circuit wires at existing splice and loosening cables as required. Using screws driven through factory made holes in back or side of box, mount box to framing as applicable.
  5. Secure cables
    Feed cables into the box via a clamp. Ensure that cable sheathing extends half to One-inch past clamp and cable wires extend approximately six inches into the box. Trim wires If re is need and strip A three-quarter inch of insulation from every wire utilizing wire strippers. Tighten screws on clamps to secure cables. Be careful to ensure that you do not over-tighten cables to avoid damaging m. You do not need to tighten plastic boxes because y have spring-tabs for clamps. Ensure that end of each wire is clean, straight and is not damaged. Strip it insulation should be stripped A half to three quarters from ends. Any wires and strips insulation that is damaged need to be trimmed using a wire stripper to level are needed.
  6. Join wires
    Following instructions of the manufacturer, utilize wire connectors to join wires together. First, join together bare copper ground wires. Consider adding a pigtail to ground wire connection, for a metal box. The pigtail is the six-inch length of a similar type of ground wire. The loose end of pigtail should n be connected to the ground screw on the box. Join together each of following wires. White (neutral) ones together. Black (hot) ones together. Finally, join together in case re are red (hot) wires.

Tug on each wire gently to confirm that is all secure.

Tuck wires into box carefully n install box cover and secure it with two screws. Ensure that cover you take is black solid without holes. Switch on the circuit breaker to restore power to the circuit.

Source: Fox Fab – Electrical Tap Box