bathroomelectricalswitchwiring
I have a bathroom fan, heater, light combo – the switch I got has three toggle rockers on it . There's one black common screw and three silver screws on the switch. Does the black power go to the common or does the single pigtailed white go to the common and the blacks to the silver screws?
Should clarify that I have three wires from the new combo unit… one for the light &a night light, one for the heater and one for the fan
No way from here to know which wire fed the light or fan, but you have a continuous hot feed into the box that fed the receptacle, light and fan. The third wire, maybe it fed the fan or maybe something something else farther down the line, if the latter that needs to be tied in 100 percent to the hot feed. All whites still tied together, blacks to the dimmer from the light and hot. All grounds tied together set with a screw to the metal box. Securing the ground to the box is not needed if the box is plastic.
Before I got too wordy, here is a sketch
Still have to learn to format better
The sketch is a little rough, it should get the idea across I hope
A simple on/off switch is best for a fan. This is a 'single-pole' switch. For a rocker style, something like this would work
The switch will most likely be rated for 15 amps. This is fine, the switch must be the same as or more than the fan.
Best Answer
You never switch a neutral
That principle should make it clear how this should get wired. Based on your picture, this diagram should help:
You take the hot (typically black) wire from your breaker, connect it to the single black screw on the set of switches. The black screw indicates it's the "Line Side." You take a bunch of wires and connect them to the silver screws (which indicate "Load Side"). Those wires then go to their respective connections at the light/fan/heater. There should be a single white wire to pigtail to, which is your neutral return. That should not be switched anywhere. You probably also have a chassis ground on your light/fan/heater. Be sure to wire that.