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bobc
Hope someone can advise, present cables supplying power to a drive for a 453kW DC motor is 2 x 400mm single core cable per phase. Motor is being upgraded to 630kW, the installer wishes to install an additional 400mm per phase to carry the load for the new motor. There is some debate as to the size of the earth required, is the earth core based on the fact that the phase is 400mm single core albeit doubled up to provide loading capability or is it's size based on the number of 400mm per phase e.g 2 x 400 for 453kW or 3 x 400 for the 630Kw motor. Any assistance would be much appreciated.