OP
Stroppy
Two rods screwed together, so 8 feet.
Discuss no earth in the UK Electrical Forum area at ElectriciansForums.net
how deep have you gone?
Two rods screwed together, so 8 feet.
Exactly, I told you that 'twig's were the way to go.
Wack a 1.2m 'twig' in and the the Ra will decrease because of the contact resistance around the electrode.
Better still, back fill with conducting cement and you've increased the contact resistance immediately.
As an aside, it only works when the soil conditions are right and Hong Kong, Gibraltar and most of Norway plus the Himalayas and a couple of places just outside our local pub are not the best places for any 'twig'
Oh I don't know, all the wee would keep the soil nice and moist! Although may corrode the rod quite quickly.As an aside, it only works when the soil conditions are right and ...a couple of places just outside our local pub are not the best places for any 'twig'
Oops my mistake, they are 5/8" not 3/8". These mediaeval measurements confuse me! 10 or 15mm make more sense to me. (see: What we SHOULD have been taught in our senior year of high school - The Oatmeal )
I will try to remember to retest in a few months time, as hopefully the soil around the top rod will have settled a bit. At the moment with all the movement from driving it in it is flapping like a dick in a shirtsleeve.
Oh I don't know, all the wee would keep the soil nice and moist! Although may corrode the rod quite quickly.
I will concede that you are referring to a fully integrated system over several miles - hardly 'twig' territory.
The basic two up two down domestic installation with a 'twig' would suffice, IMO, as long as you get a reasonable Ra of less than about 50 Ohms and as you say this value is likely to decrease as the electrode beds in.
In any case, unless you can get the value of Ra below 1 Ohm you'll need supplementary protection Earth fault protection from RCDs
Oops my mistake, they are 5/8" not 3/8".
I will try to remember to retest in a few months time, as hopefully the soil around the top rod will have settled a bit. At the moment with all the movement from driving it in it is flapping like a dick in a shirtsleeve.
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