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The ratio assigned to a current transformer is based on the assumption that the primary conductor will only pass through the current transformer opening once. It is possible to reduce the rating by looping the primary conductor through the opening multiple times. The rating will be reduced by the times the primary conductors is looped through the CT. For example, a CT with the rating of 400:5A will be changed to 100:5A if four loops or turns are created by passing the primary conductor through the CT four times. See illustration and table below.
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