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How to control a lamp from two different places by two ,2-way switches?
Stair case wiring wiring diagram, OR How to control a lamp from two different places by two ,2-way switches?
Staircase wiring wiring diagram very simple
 This is the staircase wiring wiring diagram. Here we can control a bulb from two different places by using two, 2-way switches.
                     Now consider this wiring diagram. In this case you can see that wiring is complete and bulb is ON. Suppose you want to OFF bulb from the upper switch at top of stair, simply Switch OFF the switch then wiring will break and the bulb will be OFF. You can switch ON the bulb again to switch ON this Switch. In other words you can OFF and ON bulb from upper switch at the top of stair. Obviously; you can do same from the upper and bottom switch, so let’s see how we can do that from that switch at the bottom of stair.  
                    Now return to wiring again in the pic, In this case you can see that wiring is complete and bulb is ON. Suppose you want to OFF the bulb from the lower switch at bottom of stair. Simply OFF the switch, then again wiring will break and the bulb will be OFF. You can switch ON the bulb again to switch ON this Switch 
Conclusion: 
                   This is a stair case wiring diagram by which we can control a bulb from two different places.We can switch OFF and Switch ON the bulb from both switches at the same time. in other words we can control (OFF or ON) the bulb from upper and lower switches.

                                         For Zooming, Click on Image.
This will be more useful and will have a very simple explanation

This image also explain the basic concept of this wiring
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