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what is the formular for the calculation of CT'S when
installed as part of a electrical installation so the
correct meter is used
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Answer Posted / pillay
There is no formula for this you just choose the correct size from what is available.
usually size the ammeter the size of the circuit.example the circuit breaker is 200 amps than the ammeter would be 200amps.The CT would be 200:5 or 200:1 whatever is available so long the ammeter is also of the same rating.
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