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2 Different power supplies: Connecting V- together

Discussion in 'General Electronics Discussion' started by Noise, Jul 18, 2017.

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  1. Noise


    Jan 27, 2016
    Hi everybody,

    I have a rack where there are two different power supplies. I would like to avoid gnd loops, or dangerous short circuits. Is it safe to tie all '-' terminals together? If so, should I connect the earth terminals, which are already connected to the rack chassis, to the common '-'?

    Braeden Hamson likes this.
  2. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    It sounds fine to me. You can either tie all your "-" (negatives) to earth ground, or just tie the two together and have a floating neg rail.
    As long as your grounds are tied together at the source only you won't have ground loops.
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