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[QUOTE]Originally posted by glassman: [QB] hey tex, how come we need four g-d-m wires on a 240 appliance? i hate this ground-neutral crap... check this out: [b]Fixed appliances on three-wire circuits In the USA, the chassis/cases of some ovens and clothes dryers were grounded through their neutral wires, as a measure to conserve copper during the Second World War. This practice was removed from the NEC in the 1996 edition, but existing installations may still allow the chassis/case grounding of such appliances to be connected to the neutral conductor. Note that the NEC may be amended by local regulations in each state and city. This practice arose from the three wire system used to supply both 120 volt and 240 volt loads. Because ovens and dryers have components that use both 120 and 240 volts there is often some current on the neutral wire. [/b] http://en.wikipedia.org/wiki/Ground_and_neutral maybe with the sky high price of copper we should go back to three wires systems? :D (JK) this furnace i'm hooking up needs both 240 and 120 .. the control computer only needs 120, and it don't seem right to bond the neutral and the ground... LOL... i'm gonna set the computer up on it's own circuit from the main panel and put an UPS on it... [/QB][/QUOTE]
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