Re: SMTA Postivie Ground + and -'s

Posted by karl f on March 02, 2007 at 13:35:47 from (209.23.168.240):

In Reply to: SMTA Postivie Ground + and -'s posted by sflem849 on March 01, 2007 at 18:21:54:

couple other thoughts on this:
had a customer at work say he "worked for the phone company and that is all DC positive ground because of corrosion." phone has been around 100 years so even if it's someone's now debunked theory from the 1800s, thats a lot of convention to go against and pre existing utilities to change.

i was thinking maybe voltage regulator materials affected this in the automotive world, but then i remembered 6v batteries predate voltage regulators. who made the decision to go positive ground initially?

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