So the situation is as follows: I've found an electric sauna heater I want to use in the detached, outdoor sauna I'm building. The outdoor sauna is 55' away from the house, so I'm planning to bury PVC conduit 18" deep for the wire runs.
A wall-mounted "power unit" which needs to go inside the house (sensitive electronics can't freeze, apparently) receives 240V power from the main breaker panel in the house. The power unit then sends 240V power out to the heater. A data cable also runs between the power unit and a digital control unit, installed inside the house to turn the sauna and sauna room lights on/off. A separate data cable runs from a temperature sensor in the sauna hot room back to the power unit as well. This temp sensor data cable will need to be buried in conduit for the run from the sauna to the house separate from the power cables, kept >2" away from the power cables per manufacturer. The power unit also has a connection that provides the power to a 120V light circuit, controlled by the digital control unit.
My questions: So, because the power unit is protected by the double-throw breaker, and is providing power for both the 240V run to the sauna heater AND the 120V run to the lights, will this been seen as a single circuit going to an outbuilding? Or will this count as two separate circuits?
Assuming they count as one circuit and I'm allowed to send them both to the sauna building, will the 240V and the 120V wire runs out to the sauna be allowed to be in the same conduit? Or will I need to run three conduits? (One for the temp sensor data cable, one for the 120V light supply, and one for the 240V heater supply?)
Your thoughts are greatly appreciated!!