The neutral wire provides a return path for the circuit and the ground wire provides extra protection from electrocution not found on older 30 amp, 240 volt appliance hookups.
The diagrams on this page illustrate connecting multiple lights in 3 way and 4 way switch circuits. Check below for more details about these circuits and some troubleshooting tips.
The common wire is usually black and the travelers red, in any case, the traveler wires will usually be the same color to distinguish them from the common. The stranded wires on the dimmer are spliced to the cable wires from the circuit.
When replacing an ungrounded, polarized receptacle use this type and not the grounded type above, unless it is grounded by a jumper wire to a metal outlet box that is tied to the house service panel ground through a continuos metal conduit.
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