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#132707 01/05/05 10:20 AM
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Yep, round my way the soil is rather sandy (well, the beach is only 200 ft. away!) so you can almost push a 4 ft. rod into the ground with your bare hands. Just don't expect a low resistance reading!

#132708 01/05/05 07:24 PM
Joined: Dec 2004
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D'ya think the 4 foot earth rods got anything to do with the voltage here, not having 120 Volts? Or is it just that we rely on the meaty neutral more?

#132709 01/06/05 04:35 PM
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At least with RCDs you don't usually need to have 16amps or so flowing to earth/ground before something trips! [Linked Image]

#132710 01/10/05 08:16 AM
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Quote
D'ya think the 4 foot earth rods got anything to do with the voltage here, not having 120 Volts?
I think it's probably more the case of our earthing arrangements.

The only time an earth rod is required here is on a TT system, which will have an RCD, or in old installations a voltage ELCB or a current-operated ELCB of at worst about 500mA rating.

In the U.S., it's normal for all services to have a ground rod installed, despite the fact that they are equivalent to what in British terms would be a PME system.

#132711 01/10/05 09:45 PM
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Quote
In the U.S., it's normal for all services to have a ground rod installed, despite the fact that they are equivalent to what in British terms would be a PME system.

I tend to introduce rods in new works where the PME supply is o/h and there's any risk that the neutral line could be broken - ie if the supply comes on a few spans through a wood or near trees ( which around here is usual!) before grounding.


If hindsight were foresight, we'd all be millionaires!
#132712 01/11/05 06:20 AM
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I think that's an excellent idea, and I've sometimes wondered why BS7671 hasn't specified earth rods on PME systems as an extra precaution.

#132713 01/11/05 09:33 PM
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Paul, in the late eighties, a local NORWEB inspector told me I was being "over cautious and costing the customer more"...

What price a little extra safety eh?


If hindsight were foresight, we'd all be millionaires!
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