The following lines were added (+) and removed (-):
== Conventions ==== International Conventions ===== 4 wire Romex ===Also known as 3 way Romex, which can be used for a 3-way switch. It can also be used for 220v applications where there are two hot wires, one in phase and one out of phase. For 220v wiring, the red wire is the hot wire for one 120-volt phase, the black wire is hot for the other 120-volt phase. This is NOT THE SAME as wiring a 3-way switch. Do not confuse the two possible allocations of this type of Romex. In a 3-way switch using 4 wire Romex, the "Red" is the common which carries voltage just as "Black" does, as they are both hot.