How to Splice Copper and Aluminum Electrical Wires

By Dave Rongey - Summary:

What is the Best Way to Splice Aluminum and Copper Electrical Wires? How to Splice Copper and Aluminum Electrical Wires.

Copper and Aluminum Wires

Electrical Question: What is the Best Way to Splice Aluminum and Copper Electrical Wires?

I have a lamp with copper wiring that I want to install to my house which has aluminum wiring.
Can I do this, and if so, how? I have read that there are purple wire caps which have a gel inside which will allow the connection – is that correct?

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

Splicing Copper and Aluminum Electric Wires

Application: Splice Copper and Aluminum Electrical Wiring.
Skill Level: Intermediate to Advanced – Best performed by a Certified Electrician or Electrical Contractor.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the circuit, turn it OFF and Tag it with a Note before working with the wiring.
Important: Burnt or damaged wiring and circuit components should be replaced with new electrical materials of the same voltage and amperage rating.
Notice: Repairs to Home Electrical Wiring should be done according to local and national electrical codes and installing new or replacement electrical parts or equipment may require to have a permit and be inspected.

How to Splice Copper and Aluminum Electrical Wires

A splice can be made between copper and aluminum wire using a wire connector that is approved for joining AL/CU wires together and following the approved methods:

  • Only use wire connectors that are the correct size for the wires to be spliced.
  • The wire connectors must be approved for splicing AL/CU wires.
  • Make sure that the wire connectors have a genuine UL Listing symbol.
  • Apply corrosion inhibitor gel to the wires to be spliced together.
  • Make sure that the wires are firmly secure inside the wire connectors.

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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.

FAQs Frequently Asked Questions and Comments

One Response to “How to Splice Copper and Aluminum Electrical Wires”
  1. Ann says:

    I am putting a new ceiling lamp in my shed. The new one has 3 aluminum wires (black, white & green ground casing). The ceiling has two copper wires & one solid copper line (all inside casings). Is it ok to attach copper & aluminum? Is my green ground (aluminum) good to connect to a solid copper line?
    Many Thanks,

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