They are wired so that operation of either. This method is commonly used now days as it is efficient than the two wire control system.
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2 gang 2 way light switch diagram. Notice the black wire is the only wire that we are controlling through the 2 way switch. Where 0 represents the off condition and 1 represents the on condition. Gang how many switches on the faceplate ie 2 gang 2 independant switches of any sort ie 1 way or2 way or intermediate. However if you need two switches to control a single lighting circuit such as in the case of at the head and foot of stairs so you can switch the lights on and off in both places you need to understand a 2 way switch. This is the new method to make a 2 way switching connection as it is slightly different from the two wire control method. A 1 gang switch will control a single lighting circuit and with a 2 gang switch you can control two lighting circuits and so on.
How to connect 2 way switch wiring using three wire control. Two way means that the switch has two positions on and off and two gang means that two switches are packaged together. 2 way switch 3 wire system new harmonised cable colours 2 way switching means having two or more switches in different locations to control one lamp. You have an incoming hot wire black going to one screw it does not matter if you use the brass or silver screw on the side of the 2 way switch and a black wire from the other screw on the 2 way switch going to the load light ceiling fan etc. 2 gang 1 way light switch you dont see these as much now days as many manufactures only make 2 gang 2 way light switches that serve the same purpose you just dont use the third l2 terminal on each gang however i thought we would include it just in case you come across one. A two gang two way light switch sounds complicated but its actually the very common two switch light fixture youre probably used to seeing in your home.
So you seem to have a 1 gang 2 way switch at top and bottom of stairs. Each of the gangs or switches above in fig 2 of which there are two work like this fig 3. 2 gang 2 way switch wiring diagram wiring diagram is a simplified usual pictorial representation of an electrical circuitit shows the components of the circuit as simplified shapes and the power and signal links in the midst of the devices. In position 1 when the switch is down or on com and l1 are connected together just like the one way switchin position 2 when the switch is up or off com and l2 are connected together. 1 way onoff from single position 2 way onoff from 2 positions intermediate onoff from 3 or more positions.