BACKGROUND: * (2) new 20 amp 12/2 circuits (each with own breaker of course), coming from the panel to the switch box in the bathroom. * New Bathroom exhaust ceiling unit with HEAT, LIGHT, NIGHT LIGHT, and FAN. ( Panasonic FV-11VHL2 ) * (2) 12/3 wire coming from the ceiling unit to the switch box. * FAN, LIGHT and NIGHT light will share neutral wire from circuit (a) pigtailed in the ceiling unit and in the switch box. * 4-20A single pole switches in the box will each get their respective BLACK wires from the ceiling unit. QUESTION: 1. (1) 3-wire cable from ceiling unit back to the box, will control the light (black wire) and night lite(red wire) on circuit (a). 2. the 2nd 3-wire from the ceiling unit will control the FAN (black wire and nuetral from circuit A) and Heat (red wire and neutral from circuit B). So, if you can follow this narrative, my concern is: Can I have 2 different circuits within the same 3-wire cable (#2)? This is OK right?