Grounding Transformer

Discussion in 'The Projects Forum' started by van53, Aug 15, 2013.

  1. van53

    Thread Starter Member

    Nov 27, 2011
    46
    1
    Looking at the transformer diagram in my opening post, it shows a wire labelled as E (Shield Wire - Green/Yellow).

    I will be grounding the enclosure of my power supply using the earth from the mains. Do I also connect the wire labelled E to a grounding point on my enclosure?

    What purpose does this "E" wire coming from the transformer serve? Can an example be provided in terms of what could go wrong and a safety benefit in connecting this wire to a grounding point on the enclosure.

    Thank you

    Edit: I accidentally started a new thread. So I have attached the image to this post.
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,544
    2,369
    Depends on what equipment you are installing in, most machine electrical enclosures have a point where the service ground is taken to, this is where you should take any Ground wire coming off the transformer, it is just to make sure the core shield is grounded properly, some have a metal shield between pri & sec..
    Is this a 120vac-secondary control transformer?
    It is a good idea to set up a Star Ground point where you can take all system grounds and shields to.
    You can see the shield I mentioned in your added Dwg.
    Max.
     
  3. van53

    Thread Starter Member

    Nov 27, 2011
    46
    1
    It is for a +/-12V and +5V power supply that I am building. I will likely use a metal enclosure.
    Yes it is a 120V ac control transformer.

    What would be the advantage of grounding the core shield [i.e. what could go wrong and how can grounding the core shield help]?
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,544
    2,369
    Last edited: Aug 15, 2013
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