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Re: Why positive ground?
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Posted by Mark - IN. on November 02, 2004 at 20:59:49 from (64.12.117.7):
In Reply to: Why positive ground? posted by Rosy on November 02, 2004 at 17:36:25:
It isn't just old tractors. A few years ago, some auto and truck manufaturers began using it again, and for all I know, some still do. And in the telephone business, anything still manufactured that is DC powered still is positive ground. I don't know why. But I do know that reversing polarity from -48VDC to +48VDC for even the shortest period of time before can cut the breakers has bad results. "Hello Boss? The good news is that I'm not a heart surgeon, but the bad news is that no one in the whole town of...".
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