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Thread: Joining allum nm to copper nm

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  1. #1
    General Contractor Carpenter toolaholic's Avatar
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    Question Joining allum nm to copper nm

    Are crimp sleeves ok? Tanks Tool

  2. #2
    Moderator & Master Plumber hj's Avatar
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    s far as I know they are the ONLY approved method, IF they are the correct "crimp sleeves" not the ones you stick the wires in and then pinch with a "pliers type" tool. Expansion and contraction make wire nuts impractical.
    Licensed residential and commercial plumber

  3. #3
    Electrical Contractor/Instructor jwelectric's Avatar
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    When joining copper and aluminum conductors together the key is to keep them from contacting each other. Any device that allows them to touch each other is not a good idea and will result in a failed connection.

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    General Engineering Contractor ballvalve's Avatar
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    How so when most all bus bars are al with copper wires in them?

    I would add some no-alox to the crimp too.

  5. #5
    Licensed Electrical Contractor Speedy Petey's Avatar
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    "Crimps" are NOT an approved method. The ONLY approved method is an APPROVED method, such as a CopAlum splice or a specific CO/AL splice.

  6. #6
    General Contractor Carpenter toolaholic's Avatar
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    Thank You one N all . I believe during the Nam war a lot of Allum. was used in Homes. Also copper covered Allum. It stinks to relocate a big sub panel with old Allum
    and New copper . Long hard day by My self.

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