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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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question about 220v
For single phase, 220v ac: what is the difference between 3 and 4 wire
systems? Most 220 comes into houses with three wires. Two insulated, and one bare. This implies to me that the bare one is also a ground, as well as the 220v neutral. I also observe portable generator to house setups using 4 conductor cable. Why the difference? Are the 4 conductor setups simply using separate neutral and ground? If so, is there any practical and/or safety reason to separate the neutral from ground lead? |
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