A master ON switch is used to lock the lights in the ON position. this means that the normal circuit switches cannot switch the lights OFF a simple one way switch can be used to perform this function regardless of how the lighting is controlled by the normal circuit switches.
two way switch
Two way switch is an electric switch the medium of this switch can be controlled from one place to another by electric lamp fan or anything electrical device.2 way switch is 3 wire system new harmoised cable colours. two way switch means having two or more switches in control lamp fac etc different location. In a two-way switch there are two one way switches combined in one One of the terminals can be connected to either of the two but not both at the same time. The advantage of a two-way switch is the a bility to control a single device from two separate locations.

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