3/4 way switches

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Assuming that this is on a 15 amp circuit then you need 14/3 between the switches.

This gives shows not it works.

http://www.selfhelpandmore.com/switchoutlet/4way/

But there are many ways to wire it depending where the power connects and the light connects. And those are show in the links below.

These are most common methods.

http://www.selfhelpandmore.com/switchoutlet/4way/4wayfixture.htm
http://www.selfhelpandmore.com/switchoutlet/4way/4waysame.htm
http://www.selfhelpandmore.com/switchoutlet/4way/4waylast.htm

Note in the first 2 cases part of the white wire in part of the circuit is not a neutral, but a switch leg.

In those cases both ends of the white wire is marked with black tape to indicate that it is not a neutral.