Splicing Electrical Wiring In an Attic

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How to Splice Electrical Wiring and Enclose the Wire Splice in a Junction Box: Question, What is the correct and most efficient way to splice electrical wire that is running through my attic.

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Junction Boxes and Splicing Electrical Wiring

Electrical Question: What is the correct and most efficient way to splice 14/2 from 14 /3 that is running through my attic.

  • I would like to add a switch and light to the existing electrical circuit wiring and not have to install more wiring and a new circuit breaker.

This electrical question came from: Rick, a Handyman from Holbrook, NY.

Dave’s Reply:
Thanks for your electrical wiring question Rick.

How to Splice Electrical Wiring

Application: Branch Circuit Electrical Wiring for a Switch and Light Fixture.
Skill Level: Intermediate to Advanced – Best installed by a Licensed Electrical Contractor or Certified Electrician.
Tools Required: Basic Electricians Pouch Hand Tools, a Voltage Tester, additional tools for the specific branch circuit wiring method.
Estimated Time: Depends on personal level experience, ability to work with tools and work with the circuit wiring.
Precaution: Identify the power source circuit at the panel, turn it OFF and Tag it with a Note before working with the wiring.
Notice: Modifying or installing additional electrical wiring should be done according to local and national electrical codes with a permit and be inspected.

Splicing wires
Electrical Junction Box Splice

  • Electrical wiring splices must be made in an approved junction box that is properly sized.
  • Properly sized wire connectors must be used for joining the electrical wires together.
  • Electrical Junction boxes must have a blank cover installed.
  • Junction boxes must be located in an accessible area.

Wiring a Light Switch – Diagram 1

For more information about Wiring Diagram
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Wiring Diagram
Wiring Diagram
Home electrical wiring diagrams are an important tool for completing your electrical projects. An electrical wiring diagram can be as simple as a diagram showing how to install a new switch in your hallway, or as complex as the complete electrical blueprint for your new home or home improvement project.

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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all projects.

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FAQs Frequently Asked Questions and Comments

2 Responses to “Splicing Electrical Wiring In an Attic”
  1. Patrick says:

    I have a 125 amp main lug panel that was used as a main breaker panel fed by a 3 wire feeder. I notice that the neutrals and grounds are all sharing the same bar. How do i know when neutrals and grounds should be seperated in a panel?

    • Dave Rongey says:

      The neutral and grounds are terminated together at the main electrical panel where the grounded conductor(s) from the ground source(s) is located. If a sub-panel circuit is fed from the main electrical panel, then a four-wire cable is installed containing a separate neutral and ground wire. At the sub-panel the neutral and ground are not bonded, but terminated separately. If the sub-panel has a jumper or bond between the ground or the enclosure to the neutral terminal strip then this bond or jumper must be removed thereby providing separation between the ground and the neutral.


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