tt systems

[dgreenberr]

how can i reach the recommended zs values on a tt system when my ze values is at best 2.5ohms

 

[Andy™]

if using 30mA, max Zs is 1667 ohms. although earth rod should be less than 200. and to get a Ze of 2.5 on TT is almost unheard of (unless there is parallel paths)

 

[NozSpark]

The lowest one that I have had was 15.5ohms (& I thought that was low)

2.5ohms is a really good reading for the rod alone!!!

the rest is as Andy says...

 

[green-hornet]

Do you have a Za reading for the rod?

If you have any problems with high Ze you could double up on the length of rod, some come with a screw thread to attach another rod and drive it deeper.

If you have a reading of 2.5 I would be pleased as punch and be telling everyone how good I was.

 

[Andy™]

If you have a reading of 2.5 I would be pleased as punch and be telling everyone how good I was.

and then imagine the embarrassment of discovering youve staked a gas pipe, so your rod is now a very long peice of leaky pipe!

 

[green-hornet]

and then imagine the embarrassment of discovering youve staked a gas pipe, so your rod is now a very long peice of leaky pipe!

:^O :^O:^O:^O

I never thought of that, that could explain a very low reading.

B-)

 

[Andy™]

or a lead water pipe is more likely. you probably would notice if it was a steel gas pipe

 

[batty]

I have had low readings on TT but that usually because the water pipe is helping, the rod alone usually is anything from 15 -70+ ohms.

Batty

 

[green-hornet]

I have had low readings on TT but that usually because the water pipe is helping, the rod alone usually is anything from 15 -70+ ohms.Batty

Thats very good readings Batty, I think me and andy where having a lighter moment, frivolous, but I saw the funny side.

Any reading below 200 would be good, I know the NICEIC would like to see it at around the 100 mark, but in reality this is sometimes very difficult to acheive.

It all depends on what kind of ground you go in to.

Near me its almost always bloody full of rocks.

Bent rods do not perform very well.

 

[batty]

Thats very good readings Batty, I think me and andy where having a lighter moment, frivolous, but I saw the funny side.Any reading below 200 would be good, I know the NICEIC would like to see it at around the 100 mark, but in reality this is sometimes very difficult to acheive.

It all depends on what kind of ground you go in to.

Near me its almost always bloody full of rocks.

Bent rods do not perform very well.

I didn't think you where allowed to say that sort of thing anymore political correctness and all that.

 

[green-hornet]

I didn't think you where allowed to say that sort of thing anymore political correctness and all that.

:^O :^O

I have been having a funny do all night

:^O

:coat

 

[jl-heating]

does any one else wee on there rod to lower the results or is it just me ??

 

[Apache]

does any one else wee on there rod to lower the results or is it just me ??

just you!

:|

 

[NozSpark]

does any one else wee on there rod to lower the results or is it just me ??

Only if it's in the high street pavement on a Saturday at 2pm ; ) ; )

 

[jl-heating]

i am sure its in the OSG . well it works for me and we have so many over here in worksop i shall remain doing it .

 

[Andy™]

i am sure its in the OSG . well it works for me and we have so many over here in worksop i shall remain doing it .

if your gonna use something to lower the reading to an acceptable level, you may aswell just not bother and write down a lower reading...

round here, there is rarely a problem with getting less than 200. there usually 80 at the most, and thats in fairly dry ground!

 

[bigclive]

does any one else wee on there rod to lower the results or is it just me ??

I wasn't even going to mention that, but a wet salty emission has been known to rock the balance before.

 

[jl-heating]

if your gonna use something to lower the reading to an acceptable level, you may aswell just not bother and write down a lower reading...round here, there is rarely a problem with getting less than 200. there usually 80 at the most, and thats in fairly dry ground!

andy m8 i dont really do it, i am making light of it .