Posted by barn E on January 26, 2010 at 20:24:08 from (66.2.148.6):
In Reply to: Positive Ground posted by mss3020 on January 26, 2010 at 07:08:34:
General motors for 15 years that I know of had ungrounded 110volt control wiring in machines and coveyor panels and other factory applications. Part of the power distri bution were what was called "ground lamps." These were miniature transformer and pilot lamps connected from each hot wire(both of them)to building ground. When both were lit, no problem. If one went out, that line was shorted to ground and other line brightened up. No problem unless you got ground on other line. Then fuses would blow and emergency repairs were made. Some time later panels would come into factory with one side of line already grounded and "ground lights" eliminated. This was in Detroit but probably used other places, too. GM had their own codes and standards. One I recall was no conduit smaller than half inch. Another was only one erickson coupling in a conduit run. Sealtite or flexible conduit was limited to 3 feet long. All 440volt equipment had to have magnetic starter. Lots more but I can't remember. John T might tell you some of this. Dave
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