we can wire a double switch by connecting the phase wire to one point of the first switch and from the same point take the phase wire to the second switch and connect the next one and for neutral follow the same procedures.
The best thing to do when you are running a double switch is to make sure you have two grounds and two hots and you may also want to put a fuse in it also just incase it gets overloaded.
the main phase, neutral and earth wire- take from the main distribution board and connect to the first switch and take the connections for the second switch from the first switch