The NEC allows Class 2 control wiring to be supported by the raceway that supplies power to the piece of equipment (like a furnace) that the control wiring is associated with.

Question

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Per NEC 725.3(B), Class 2 control and signaling circuits can be run in the same raceway as power supply conductors as long as they comply with specific conditions. One of these conditions is that the raceway must supply power to the equipment controlled by the Class 2 circuit.

The NEC Allows Class 2 Control Wiring to Be Supported