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In Reply to: Part 2: Ground is the wrong term today. posted by Ron Oehlert on April 26, 2007 at 14:48:18:
Ron>> The term *ground* with regards to electronic circuts
>> actually refers to circut Common return.Not in any circuit I have seen
in over 30 years as a technician.
Ground is EARTH ground on every circuit
I have worked on.>> With correct terminolgy, there then is no
>> such thing as a floating ground.Circut Common Return is floating, whenever
circuit current is flowing it increases
and thereby is no longer Earth ground
and is therefore floating.
That is why anything with a metal case
needs an three wire plug by law.
Also you can't recommend referencing your signal ground
to AC common and you don't recommend referencing them
to Earth ground - floating ground is all that's left.>> Signal or circut Common should NEVER have a
>> direct connection to AC Mains; only via the
>> chassis lest SAFETY be compromised.Circuit Common should never have a direct connection
to AC Mains ground inside your equipment is correct.
They are connected at the box but if you do this then
you are making your connection as an alternative
grounding route for the other devices on your circuit
and corrupting the safety providing earth ground.
But since the signal ground produces no significant current
and is using it only as reference NO safety is compromised.>> So why refer to any electrical connection
>> in such circuts as a *ground*?Because earth ground is the BEST reference
whether you are talking AC or signal.
I ground ALL my equipment without problems.
I actually run a "new" ground route usually
from a convenient water pipe nearby.
Common/return and ground are the same point
at the incoming box but are different soon after
and are more different the further you get away
from the box because accumulated resistance and
more devices drawing current.>> absolutely NO direct Earth Ground connection
>> is neccessary for automobile ...On purpose because the automobile would be
susceptable to lightning strikes.
They found that out the hard way.
As well as why to have a negative ground.
Positive grounded vehicles rust very quickly.DanL
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Follow Ups
- Re: Part 2: Ground is the wrong term today. - danlaudionut 16:39:13 04/26/07 (9)
- Gotcha - Ron Oehlert 09:14:02 04/27/07 (3)
- Re: Gotcha - danlaudionut 10:11:40 04/27/07 (2)
- Gotcha Again - Ron Oehlert 19:32:07 04/27/07 (1)
- Re: Gotcha Again - danlaudionut 20:49:47 04/27/07 (0)
- "That is why anything with a metal case... - kurt s 08:54:15 04/27/07 (4)
- Re: "That is why anything with a metal case... - danlaudionut 10:21:29 04/27/07 (3)
- Dan... - Henry Pasternack 18:46:37 04/27/07 (2)
- Re: Dan... - danlaudionut 20:36:53 04/27/07 (1)
- Unfortunately, - kurt s 21:10:10 04/27/07 (0)
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