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Thanx for your help guyz. This was my first thread and I am touched by your responses, their certainly gave me direction. I really appreciate it.

Thanx jnims for your reply, but I don't understand how you derived the impedance factor that you quoted on your reply.

We are stuck with a situation where protection CTs (class 10P10, 10VA, 500/5) are used for metering - is this a problem? The 500/5 amp ratio is too large for our current readings, we want use interposing/ratio correction CTs such that our metering is at 200/5 amp scale. What considerations do I...