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it is better to put or install your main circuit breaker inside the house, how ever if your meter installed in pedestal or 25 meter from your main circuit breaker therefore it is necessary to install also a main circuit breaker for the sole reason of protection. http://electricalengineeringtour.blogspot.com Thanks

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most of the current transformer are we used 600:5, 800:5, 1200:5 for three phase transformer. then you can use smaller one wire. http://electricalengineeringtour.blogspot.com/

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