We have a control panel that has a few fan motors (3phase) and two heaters ( 3 phase) and single phase loads to valve actuators. My question is regarding the sizing of the feeder cable to this control panel. Do we work out all the currents individually and then add them and treat this as a "lump sum" to size the feeder cable and its associated protection.
We are in the uk and voltages are 400v 3 phase and 230v single phase.
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