E
Engineer54
And you keep banging on like you always do without knowing what i do!
Or knowing what your doing!!
Discuss Earth rod query in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
And you keep banging on like you always do without knowing what i do!
You can put clairvoyant on your CV now then!Or knowing what your doing!!
You can put clairvoyant on your CV now then!
OK, i thought i was the catty one, meow!Best stick to your Meow jokes/humour...
OK, i thought i was the catty one, meow!
I go back to my original question... What is the point? There's no difference between 200 and 1000 ohms when it comes to an earth rods effectiveness??? This is the part I struggle to understand.
I've been ploughing a relatively lone furrow on exactly this point on here for ages....and taken a lot of flack for it.
The logic of those who scoff at the Bs recommended max of 200 ohms,and then smugly state they wont settle for anything over ...say...40 ohms has always defeated me.
I would also point out that I have never accepted the single RCD on a TT....there should be a requirement for a 'master' 100ma T/D alongside the 30ma device unless it can be proved that an Ra value low enough to operate an OCPD can be maintained.
Bear in mind as well that most of the TT queries on this forum concern small installs....(not the kind of big stuff E54 deals with)....for which multiple super rods are overkill IMO
And you can install a purrrrrrfectly good earth rod?
Maybe he's clairvoyant the same as you!How do YOU know?? lol!!!
Maybe he's clairvoyant the same as you!
The flack came and rightly so, from you advising junior members to bung a twig in the ground and if you saw 200 ohms or less, that's all you needed for a TT system, and not bothering any further...
I think that i have stated many times now that as far as domestic installations go, a couple of coupled 5/8'' rods (coupled) should be the standard installation, coupled with an up-front S type RCD device. Do you really think that's over the top, considering that the TT installation you have installed should be robust enough to last a min of 30 to 40+ years??
Now let's say that driving 2 rods in the ground on a domestic installation gave you an Ra value of say 10 ohms. You know that in all probability, the stability is going to be present. Would you approach the client and give them a choice of adding another rod, thus getting down, pretty much close to the 1 ohm mark (after settlement) or not?? Which is the other point i've been trying to make over the many threads on this subject... Wherever or whenever possible, go that extra distance to get the desired results, and not just rely on what it says in the Reg's...
As for commercial and industrial installations that have a number of employee's etc why wouldn't you be trying to aim for TN values?? A 200 ohm's max in such circumstances, is complete tosh!! Oh, ...and what you call ''Super Rods'' were once the standard sized rods used in the UK and everywhere else and STILL ARE, in most of the countries i've ever been.... I actually saw for the first time, a 1m 5/8'' rod while in an electrical wholesalers in Cyprus while i was home a short time ago. I asked if that was the standard size they were using now in Cyprus. ...What i got was a blank look, he then disappeared out back and came back with a what looked like a 2.4m rod, ''first one of these, ...then one of these'', pointing to the 1m rods!!! So even in Cyprus the one metre rod is classed as no more than an extension piece!! lol!!!
The thing is E54 I have seen many TT installs in my area which are 20+years old with a single 'twig' which are perfectly satisfactory today,and will be for another 20 I've no doubt...I base my opinions on that.
My only argument is with those who turn up their noses at 200 ohms...and yet seem to think they are the dogs danglies with 40 ohms.....I just cant see the logic.....If the installer insists the Bs value is not acceptable then he should get a stable TN value....I have no dispute with that at all.
Maybe smear your rod in E45 then everyone is happy!I think I'll change my user name to twiggy.....or twiglet perhaps?
Wish there was a "like a lot button"!or E54 changes his name to 'twigpuller'
Maybe smear your rod in E45 then everyone is happy!
Maybe smear your rod in E45 then everyone is happy!
Reply to Earth rod query in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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