View Single Post
Old 03-16-2015, 12:26 PM   #8
Nima
Blue 67
 
Join Date: Apr 2004
Location: Western WA
Posts: 1,169
Re: Another electrical question

Quote:
Originally Posted by truckster View Post
They're totally different. Think of it this way: the electrical service brought into your house is 220 volts single phase. In your breaker box, you have two strips of breakers; each one is for one "side" of the phase. In other words, the two phases are 180 degrees out of sync. When you wire a 110v circuit, it's connected to one of the phases on the hot side (black wire) and goes to ground through the neutral (white) wire, which completes the circuit. The bare copper wire is a ground, which is there for safety's sake.

When you connect both phases (really, both sides of one sine wave), you end up with 220v; one phase is represented by the black wire and the other by the red wire. Since the circuit is completed by the two hot wires, you don't need a neutral. Again, the ground is there as a safety measure. So a 220v outlet is different from a 110v outlet, and you should never (NEVER!) substitute one for the other.


To make things a little more confusing, some 220v outlets (such as for electric clothes dryers or stoves) DO have a neutral leg, and as a result will have a 4-prong cord instead of a 3-prong cord. That's because those appliances use both 220v (for the burners, for example) and 110v (for the clock). The older electrical code allowed for the use of the ground wire in that type of circuit to complete the 110v leg, but current code requires a separate neutral wire. It is permissible, however, if you have a newer appliance and an older outlet to use a 4-prong to 3-prong pigtail

I hope this helps.
Thank you for simple but detailed explanation. It is very helpful.

Thank you all.
__________________
1953 GMC 3/4 ton: current project
1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake
1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!!
1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive
1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project
2005 Silverado 2500, 4x4 Duramax, original owner
Nima is offline   Reply With Quote