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Bus duct is used to transmit the power from the secondary of the transformer to the Main distribution board? If the cable is used instead of bus duct, we would size the ground cable approximately half the cross section area of the power cables according BS 7671 table. 54.7

If this is a bus duct, how to decide the ground cable size? Noting that bus duct will have a metallic enclosure.
 

davesparks

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