Power supply issues with 3-phase 4-wire incoming distribution cabinets
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The power supply coming from the transformer is three-phase four-wire, and what is distributed through the distribution cabinet is also a three-phase four-wire system. However, the distribution cabinet contains control components such as contactors; so is it better for the control circuit to use a voltage of AC 380V directly, or should a neutral wire be provided inside the cabinet to use a voltage of 220V? Or use a transformer to convert 380V to 220V?
It’s fine to use a direct AC 380V voltage, or to separate a neutral wire inside the cabinet to use 220V voltage; there’s no need for a transformer. After all, every additional device represents an extra point of failure, so there’s no need to include a transformer