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I used 12 conductor cable to wire status and control signals from field equipment (138KV Circuit Breaker) to PLC Remote IO (Siemens ET200M). Out of 12 conductors, 4 wires are used for 24VDC signals and other 5 wires are used to carry 125VDC signals and rest of them are spares? Is this method OK to use or allowed as per NEC? Appreciate help.