Why do I have two switches in my home renovation bathroom?

This is correct, because the bath bomb switch controls the zero line (the zero line we know is a public line, generally only one, when the switch is closed, the zero line and the live wire form a loop, at this time the load works) The lack of this connection is that the load has been in a live state, which causes potential safety hazards to future replacement, so the decoration company added a single open to control the bath bomb switch, which is equivalent to a master switch, and can be closed during maintenance to ensure personal safety.

You should have construction drawings at home, just look at the construction drawings, in my experience, your switch is a mirror front light. Look at the light switch above the mirror.

Since it's installed, it's an ornament.,Jump the live wire directly to the bath bomb control switch to control it directly.。

This switch should be designed at the entrance of the toilet so that it can be easily controlled from outside the bathroom. It's boring to have two switches in one!

Is it to control the bathroom exhaust fan.

First of all, it is necessary to explain how many lights there are in the bathroom at home, whether it is dual-controlled, etc. Otherwise, the cause cannot be determined. You can consult the reason for the renovation company that renovated you.

One for heating appliances, one for other main lighting, and some for a mirror headlamp. They are all placed as needed, and there is no rule that there must be several.

It is best to install a switch for high-power electrical appliances separately, one water heater and one bath bomb.