grounds [RE-wrenches]

hugh piggott hugh.piggott at enterprise.net
Mon Aug 6 15:00:52 PDT 2001


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>Hugh,
>In our country, tying a current-carrying conductor to ground at one point is
>called bonding.

same here

>  You then have a "grounded" conductor--the neutral, which is
>current-carrying but has zero potential to ground--and a "grounding"
>conductor (the bare or green), which carries current only in a fault
>situation.

Here we have a bare or green conductor (with yellow stripes) except 
we call it 'earth'.  And it never carries load current.  In cases 
where there is multiple neutral-earth bonding, then the neutral (a 
black wire here) becomes the ground (pme 'protective multiple 
earthing').  I can never understand the logic of multiple neutral 
grounding like that.

>It's confusing also because multiple ground rods are "bonded" together, so
>there can be no potential between them.

same here too :-)  We also bond the water pipes etc.

>Trace emphasizes bonding AC and DC
>ground paths together because otherwise that potential (such as a
>lightning-induced surge) fries stuff in the inverter, where both come
>together.
>Does this help?

Yes thanks.  It sounds as if the terms are just as ambiguous in the 
USA as they are here.  It's time someone thought of a clearer way to 
describe all of these connections.
-- 
Hugh

http://www.ScoraigWind.co.uk

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