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Precautions to be taken while using instrument transformers: 1. Secondary of CT is never kept open circuited when it is energized. 2. Secondary of PT is never kept short circuited when it is energized. 3. Power fuses must be connected in the primary circuit of PT. 4. Always ground the metallic cases of instrument transformers. 5. Secondaries should be grounded close to the transformer. 6. When secondaries of transformers are interconnected there should be only one grounded point. 7. Do not touch the leads of terminals of the instrument transformers unless they are properly grounded. 8. Never connect to DC circuits.
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