As a licensed electrician for 30 years and also having studied university level courses on electrical power distribution and NEC article 250, I agree 100% with John T and also Buickanddeere. I can add a few real life examples of what can happen with improper grounding. A typical example is a DIY homeowner who installs an electrical panel in a barn which is wired from a residence or building with the main service panel. The panel installed in the barn or outbuildings is a subpanel and must have 2 hots, a neutral, and ground in the wiring to the subpanel. The bonding screw which is installed to bond the neutral to the ground bar and enclosure of the subpanel must not be installed at the subpanel, but must be installed at the main service panel. The subpanel enclosure is electrically bonded to the main service panel grounding means. Neutral current flow is isolated from the subpanel enclosure so that the subpanel enclosure is not at the electrical potential of the neutral conductor. Just for kicks I would check various neutral conductor voltage to ground on live circuits. I usually saw 50-70 vac on the neutral conductor. Many electricians and electrical safety inspectors will say that the greatest shock hazard is from a voltage that paralyzes the body muscles so that there is not a big enough physical reaction to release the conductor. So for those who think it is okay to add a 120 vac circuit to a 3 wire 240 vac circuit, ask yourself if you want to energize an enclosure or appliance housing at 70 vac, and then have yourself or a family member be unexpectedly exposed to that voltage. It could cause a fatal injury, as John T has said. The amount of voltage present on a neutral conductor will depend on the type of electrical load on the circuit. If a 120 vac receptacle is added to a water heater circuit, and a corded drill is plugged into the receptacle, the drill is an inductive load which will energize the water heater jacket at the voltage of the neutral conductor. I have seen situations where the entire water piping system of a home was energized at the neutral potential of a circuit. Sometimes when turning on the kitchen faucet, a family member would be shocked. Bottom line, John T has labored long and hard to explain this subject. Listen and live to see another day!
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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