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Current Transformers

Former Community Member
Former Community Member
Hi,


Please can someone help settle an argument, we have 3 current transformer fitted on the incoming 3 phase supply at work. the current transformers are reading L1- 12A, L2 - 7.4A and L3 - 5.6A. I'm saying that all current transformers need earthing regardless of the current the transformers are reading. And the other electrical engineer is saying it only needs earthing when high current is being read. Who is right and who is wrong.


Andrew
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  • 0
    Hi Andrew,


    Is it possible you are both wrong? I was brought up that you don't earth current transformers, though I am dredging my memory to try and remember the reasoning. If I remember rightly, if you have a broken wire on a current transformer circuit you can end up with a significant voltage from the CT. If one side is earthed then the other terminal will have a dangerous touch voltage while if there is no earth connection it is only dangerous if someone takes hold of both terminals simultaneously.


    I am sure that someone will be able to refute me/give chapter and verse on what should be done when and why.


    Alasdair
Reply
  • 0
    Hi Andrew,


    Is it possible you are both wrong? I was brought up that you don't earth current transformers, though I am dredging my memory to try and remember the reasoning. If I remember rightly, if you have a broken wire on a current transformer circuit you can end up with a significant voltage from the CT. If one side is earthed then the other terminal will have a dangerous touch voltage while if there is no earth connection it is only dangerous if someone takes hold of both terminals simultaneously.


    I am sure that someone will be able to refute me/give chapter and verse on what should be done when and why.


    Alasdair
Children
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