Ground Connection to Power Supply Output Terminal

Discussion in 'General Electronics Chat' started by blah2222, Sep 12, 2014.

  1. blah2222

    Thread Starter Well-Known Member

    May 3, 2010
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    33
    Hello,

    I am curious what the common practice of grounding power supplies entails. I have seen the following three different configurations:

    - earth ground connected solely to the chassis, leaving +/- output terminals floating
    - earth ground connected to chassis as well as one of the output terminals (normally -ve)
    - earth ground connected to chassis as well as one of the output terminals through a large value resistor (>1 Mohm)

    Grounding the chassis is a no brainer, but I am wondering if one of these practices is better suited for a general DC supply (<30V, <1A). Would the third option still be stackable?

    Thank you.
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
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    good quality power supplies usually have 3 connections, +, -, and ground with niether of the output terminals grounded. thats so you can use it for a ositive supply or a negative supply determined by whitch you ground. the chasis of your project should be grounded for safety's sake though, even if you float the circuit from ground.
     
  3. studiot

    AAC Fanatic!

    Nov 9, 2007
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  4. blah2222

    Thread Starter Well-Known Member

    May 3, 2010
    554
    33
    I have now looked at that thread. Some good suggestions to follow.

    Is a bleeder/static resistor necessary between one of the output terminals when left floating?
     
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