chassis to earth how?

Discussion in 'General Electronics Chat' started by williejon, Mar 2, 2013.

  1. williejon

    Thread Starter New Member

    Feb 18, 2013
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    0
    I need some help with an old box power supply. (40's, 50;s Welsh Scientific 2606k 12 dc / 24 ac) I have no schematic but it appears to have no on/off switch which is a problem. It also has a circuit breaker which I do not trust. I simply want to take some measurements if only for its noise and cycle hum. I tried to draw (below) some grounding alternatives but need expertise. I don't want to get bit. So, I have questions about polarization and protection.

    1) add a strip with breaker on the line in (unlike where I drew the fuse.
    a) make sure it breaks the whole circuit
    2) add ground to both chassis and earth

    Here is where I am stuck. Can I come off the core? How do I come in and out of the transformer? Thanks for any suggestions.:)
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    I'm not sure of your question here, but a chassis connected to earth ground is as safe as one can get.

    Isolating from ground is less safe.
     
  3. williejon

    Thread Starter New Member

    Feb 18, 2013
    11
    0
    ψ thank you
     
  4. williejon

    Thread Starter New Member

    Feb 18, 2013
    11
    0
    Thank you. I'll rethink the isolation
     
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