grounds [RE-wrenches]

[hugh piggott]

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Grounding is a very confusing subject.

As I understand it,

1) all extraneous metal work - equipment cases and frames - should be 
connected together (equipment grounding) for both safety and 
lightning protection.

2) Also, this grounding system should be 'physically' grounded using 
rods or electrodes in the soil.

3) Current carrying conductors are also 'bonded' to ground, (usually 
at one point only for each supply, so as to prevent the grounding 
system from sharing the power circuit).

Each of these connections is referred to as grounding, and this 
creates great ambiguities.

I am not clear what Bob-O means when he makes a distinction between 
electrical and lightning ground rods.  Are they not connected to the 
metalwork of the system, and if so are they not thereby connected to 
each other in any case?

I read in the Trace tech note that all equipment should be grounded 
at one point.  I assume this means connecting all ground rods 
together and all equipment together and then making a final single 
connection between the two systems at one point.

how does this fit in with having two electrodes which must never be connected??

sorry for my ignorance of this subject.

>Ned,
>I think an electrical and a lightning ground rod should absolutely 
>NOT be connected. Why invite the lightning into the house? I've 
>heard or read, but I can't find it anywhere, that at least six feet 
>(2 metres) separation between the two rods are necessary.
>Bob-O

-- 
Hugh

http://www.ScoraigWind.co.uk

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