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Transformer Grounding

Discussion in 'Electronic Basics' started by Jay Davis, Nov 9, 2003.

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  1. Jay Davis

    Jay Davis Guest

    I'm building a basic power supply utilizing a simply 24V, 5A
    transformer. I want to test the circuit before installing it in a case,
    but I'm a bit confused about how I should ground it. I've got it
    properly fused, but the third wire in the cord (the 'earth' ground)
    currently isn't hooked to anything (yet, and no, I won't turn it on
    until I get this figured out <grin>). I realize that one normally
    attaches it to the chassis, but in this case, what should I attach it
    to? Should I solder it to the case of the transformer? What about if I
    install the power supply in a plastic case, then where should it go?

    Thanks for your help!

    Jay Davis
     
  2. Jay Davis

    Jay Davis Guest

    <snip>

    Sorry to follow up my own post, but I should have mentioned that my
    secondary is center tapped. Should I ground the earth ground to the
    center tap of the transformer? I've seen this design in some places,
    but I don't know if it's correct or not.
     
  3. You may or may not want to have the DC outputs referenced to Earth
    ground, so that is your choice. But in the absence of a chassis, I
    would attach the safety ground to the transformer core in whatever way
    is practical (lug bolted through the lamination stack, if there is a
    hole, or lug bolted to mounting tab).

    It is also a good idea to have a fuse in the hot lead of the primary
    wiring.
     
  4. Jay Davis

    Jay Davis Guest

    Yep, got that fuse in there. I'll polish up one of the mounting tabs
    and bolt the earth ground there. Thanks!
     
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