I'm gonna show you how to change a to gang switch you may need to do this if the case is broken or simply for decorative reasons and here's what you'll need to do the job screwdrivers wire stripper or cutter tool two gangs socket switch before you want to take any electrical work in the home remember these instructions serve as a guideline only if in any doubt or if your job differs in any way from the method you're about to see please contact a qualified electrician remember safety first make sure the electricity has been turned off with a fuse box before starting work safety tip if possible lock the fuse box if not put electrical tape over the switch on the fuse box or leave a note to make sure nobody turns power back on while you're working read the instructions of the new switch before you start to work unscrew the old switch and leave to hang on the wall keep the old screws in case you need to use them later with the new fitting take a note of which wire goes into each terminal when dealing with wires always remember green yellow is earth brown is live and blue is neutral in older houses the wires could be of different colors red for life black for neutral I'm green for Earth top tip a good idea is to take a photo of the wires in place with your mobile phone or camera safety note if you do not have an earth wire at the switch don't attach any metallic switches to this fitting for example a brass or Chrome fitting now you're ready to change your switch the best way to do this is place the new switch up against the old one and change one cable at a time firstly remove the common Co M wire from the old switch and attach it to the common terminal in the new switch next remove the l1 wire from the old switch and attach to the l1 terminal in the new switch and finally if there's an l2 wire present for two ways switching for example on a hallway to landing attach the l2 terminal in the new switch there may not always be an l2 wire present repeat this process for the second switch on the fitting ensure all connections are fully tightened and no copper is showing if fitting a metallic switch you also need to connect an earth fly lead from the new switch to the box so now you're ready to secure the switch and this is where the old screws come in really handy because often times the new screws are going to be too short to fit the existing box fold the wires neatly into the box and secure the fitting in place turn back on the power and test the switch so there you go you've just seen how to change a two gang switch for more hints and tips go to Woody's diy.com