How to connect aluminum and copper wire

How to connect aluminum and copper wire

Older houses use aluminum wire wiring. Often, when carrying out renovations in your apartment, it becomes necessary to lengthen the wires. If you use copper wires or alloys, then you can’t just connect them to aluminum wires - every electrician, and not only that, knows this rule. I will show you a simple, affordable, and most importantly reliable way to connect copper and aluminum conductors together.

Will need


  • Bolt or screw with M4 thread, 16 mm long.
  • Three wide washers for M4.
  • Grover M4.
  • M4 nut.

The sizes may well be different, I’m just giving a list of what I used.

Connection of aluminum and copper conductors


We clean the ends of the wires that we will connect. We take pliers and make rings at the ends of the wires.
How to connect aluminum and copper wire

Rings on both. They can be made with another tool or even manually.
How to connect aluminum and copper wire

Next we put a washer on the screw. Its width should be greater than the ring of bare wire. Then we put on a ring of aluminum wire, so that when further screwing the connection, this ring on the wire does not loosen.
How to connect aluminum and copper wire

Then we put on another washer and after it a copper wire.
How to connect aluminum and copper wire

And on top of everything we put the third washer on top and secure it with a nut.
How to connect aluminum and copper wire

Tighten with a tool.
How to connect aluminum and copper wire

We insulate well with electrical tape.
How to connect aluminum and copper wire

How to connect aluminum and copper wire

The insulation must be reliable; it is advisable to apply two or three layers of electrical tape. This is what the connection looks like in the junction box.
How to connect aluminum and copper wire

This connection of wires will be reliable. The grower will maintain pressure if the connection suddenly becomes loose. So you can safely close it with a lid and hide it behind a layer of plaster.
How to connect aluminum and copper wire

Of course, there are many other devices on the market for connecting wires, but it seems to me that this method is the most reliable and durable.

Watch the video


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Comments (63)
  1. Guest Yuri
    #1 Guest Yuri Guests 8 May 2018 13:25
    17
    There is an obvious problem - the washers are galvanized, zinc and copper are absolutely not friendly, just clean steel or zinc
    1. Guest Mikhail
      #2 Guest Mikhail Guests 8 May 2018 20:37
      3
      In general, aluminum is cleaned under a layer of Vaseline or other lubricant, after which its friendliness to other metals increases sharply. And yes, he begins to be good friends with himself.
    2. Guest Vladimir
      #3 Guest Vladimir Guests 10 May 2018 08:01
      4
      I strongly disagree! Look at the range of normal potentials.
  2. Vasilii
    #4 Vasilii Guests 8 May 2018 18:10
    4
    The jamb is only suitable for open wiring because over time one could notice how it would begin to glow in the dark.
  3. Guest Yuri
    #5 Guest Yuri Guests 8 May 2018 18:47
    31
    Isn’t it easier to use a regular brass terminal block, compatible with both aluminum and copper wire? If there is any doubt about the reliability of screw fasteners, then first tin them from the inside with low-melting solder... Checked
    O!!!
  4. Guest Electrician
    #6 Guest Electrician Guests 8 May 2018 20:45
    3
    The aluminum will fall off. The heating will be due to the “structure”.
  5. Guest
    #7 Guest Guests 8 May 2018 21:19
    2
    I always connect with blues! Everything is working!
    1. arv
      #8 arv Guests 1 February 2019 14:19
      3
      God forbid I meet such an electrician
  6. Guest Nikolay
    #9 Guest Nikolay Guests 8 May 2018 21:44
    9
    If there is a nut, then the screw turns into a bolt.
    1. LoMaster
      #10 LoMaster Guests October 4, 2018 07:07
      0
      And a screwdriver into a wrench)))!
      1. Guest Roman
        #11 Guest Roman Guests 17 January 2019 13:50
        1
        And pants into shorts sweat_smile
  7. Uncle Dima
    #12 Uncle Dima Guests 8 May 2018 22:24
    20
    Why such complexity when there are special VAGO connectors
  8. Guest Mikhail
    #13 Guest Mikhail Guests 8 May 2018 23:00
    19
    Isn't the "Wago" type terminal block simpler? and most importantly faster
    1. Guest Igor
      #14 Guest Igor Guests 4 August 2018 23:19
      7
      Sorry, but your "WAGO" turned into coal after a week of work.....
      1. Eugene
        #15 Eugene Guests November 19, 2018 01:07
        7
        It is YOUR WAGO that has turned to coal, but the real one, which has the Al/Cu inscription on it, will work perfectly for many years.
  9. Sashka
    #16 Sashka Guests 8 May 2018 23:09
    2
    I used brass nuts. From experience. I connected high-current circuits. Steel also turns into coal over time.
    1. Guest Roman
      #17 Guest Roman Guests 17 January 2019 13:52
      3
      It’s strange that this method of making coal is still not practiced...
  10. Dmitriy
    #18 Dmitriy Guests May 9, 2018 02:09
    8
    Buy a car instead of working on a collective farm.