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Malcolm - let's face it; either which way, it's not going to be you or me out with the sledge hammer knocking rods in. Fancy a beer that day whilst we watch?
 
You know what mate I have yet to put a rod in with an SDS ...........................it's still hit and hope with me, luckily or hopefully more like, I want my days of fitting rods to be of a minimum now, but never say never ...............fancy some scratchings with that beer ???
 
I think you need to sit down with your calculator and revisit some of these sums and your testing..... if you have a Zs of 3.35 when you have a Ze of 207, then that means you have an R1R2 value of -203.65. Now that's a cable I'd really love to know where to buy.

The low pfc values that you get on TT installs are part of the reason for the requirements for RCD protection; it is realised that you will never get anywhere near disconnection times with that little current.

To lower your Ra then as others have said, bang in some nice LONG 5/8 rods down to at least a couple of metres.

Sorry my typo : r1+r2 of 3.35. lol

think im gunna just put longer rod in . yes they are covered by rcd od course ( dis times etc) just trying to keep costs down for customer ( single mum ). doing this will enable the continued use us existing bonding . therefore wont hav to ripp up her laminate flooring to run new 10mm.

Conversion to PME will mean upgrading , therefore cost and damaged flooring.
 
.it's still hit and hope with me, luckily or hopefully more like, I want my days of fitting rods to be of a minimum now, but never say never ...............fancy some scratchings with that beer ???

Not an earth rod, but a couple of summers ago I was on a festival site and there was a problem with one of the tent pins (metal stakes) on a massive tent/stage... the pin HAD to be where it was, but had hit rock - the problem being that if you dug the rock up there'd not be enough friction left afterwards for the pin. A JCB came along with one of those hydraulic thumper things on the arm, but after 10 mins the driver gave up and disappeared......so for 2 whole days a site team of fit strong lads (and a couple of lasses) took it in turns just to whack this thing with 18 pound sledges - and a fraction of a mil at a time, it eventually went in.
 
Re adding a rod: If you go that route it will need to be at a distance away at least 3 times the length of the existing rod

Where on earth did you get that from?? You'll be seeing very little advantage, spacing more than 1.5 to 2 times max, the driven length of the first or existing rod....

By linking to a Yank web page perhaps more importantly to note the size/length of ''THERE'' standard earth rods, smallest being 8 foot, but generally 10 foot!!!! Bit different to the thin 3/8'' 1m twigs that i keep getting told are suitable for purpose!! Like hell they are!! ...lol!!
 
Sorry my typo : r1+r2 of 3.35. lol

think im gunna just put longer rod in . yes they are covered by rcd od course ( dis times etc) just trying to keep costs down for customer ( single mum ). doing this will enable the continued use us existing bonding . therefore wont hav to ripp up her laminate flooring to run new 10mm.

Conversion to PME will mean upgrading , therefore cost and damaged flooring.

So the families safety and well being, is secondary to your customer, than the thought of disturbing a laminate floor?? And what's worse , you seem to agree with them!!!
 

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