May I wire a bath exhaust fan and light from two switches and use a common grounded wire(white wire).?

As long as the combined amps of both is less than the rated amps of the wire itself. If the appliances are rated in watts, Amps X Volts = Watts. As to wire size, #14 wire is rated for 15 amps, #12 wire is rated at 20 amps. Your current will be 110-120 volts (in the US).May I wire a bath exhaust fan and light from two switches and use a common grounded wire(white wire).?
If it is the same circuit, yes since all you are doing is controlling 2 outlet devices separately. If it is 2 different branch circuits, then no. To check this have a qualified professional electrician do the work. If there is only one feed wire to the switches, then it is one circuit.May I wire a bath exhaust fan and light from two switches and use a common grounded wire(white wire).?
Sure. The circuit must be on a GFCI.
As the fourth wire?

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