The neutral wire carries electricity back away. It needs to be grounded to earth.
The ground wire - in a perfect world - is never used or needed. However _if_ it's needed, it might save your life or keep from burning something to the ground - or less dramaticly save your $29 electric drill from fizzing itself.
The ground wire needs to bleed electricity to earth, so it too needs to be bonded to earth.
Turns out a good place for both the neutral & the ground wires to bond to earth is in one location by the main panel. From this location, you should run seperate ground & neutral wires.
If the ground & nuetral ever get bonded together anyplace else - then it sets up odd loop (curcular) connections that don't fail properly. It sets up conditions where any electricity on the neutral wire _also_ now is carried by the ground wire. This makes all your bare metal everywhere possibly electrified....
Put it another way. You have 2 pipes running through your house, one is hot water and one is cold water.
Somewhere near the hot water heater the cold & hot water pipes are connected the cold water branches off, and the hot water branches into the heater & is the hot water side.
You can't say the hot & cold water lines are the same, so can tie them together anywhere I want to - you would have a mess of tepid water & no hot, no cold water....
Likewise, even tho the ground & neutral wire are bonded at one place (or should only be bonded at one place!) they are different from there on, and shouldn't be re-connected to each other later on. If you connect the hot & cold water lines together anywhere other than at the water heater, you end up failing the 2 sperate water lines and neither will work proper.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
... [Read Article]
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