Best ZE on TT

[bigbaddave]

As above whats the best reading you guys have had.. Had a 0.58 today on a rod

 

[trev]

0.29 for me. 3 coupled 5/8 rods.

 

[bigbaddave]

0.29 for me. 3 coupled 5/8 rods.

Rrrr man.. There is all ways one that goes better.. Lol

 

[trev]

On a rewire with another member of the forum a few months back and he beat my record mate but he cheated. He took the measurement on the existing rod(s) (on my recommendation I hasten to add) and we decided to leave that in place.

 

[MDJ]

As above whats the best reading you guys have had.. Had a 0.58 today on a rod

Under 3ohms many times

 

[Amp David]

Never had a Ze on a TT myself

 

[bigbaddave]

Never had a Ze on a TT myself

There is allways one funny trucker aint they.. LOL

You knew what i meant tho

 

[trev]

Never had a Ze on a TT myself

Off to pedant's corner for you, don't worry though you'll have me for company

 

[lfcsparkycus]

1666 ohms!

 

[bigbaddave]

1666 ohms!

Is that before or after you peed on it??

 

[lfcsparkycus]

Is that before or after you peed on it??

ha ha, after of course, i couldn"t walk away from it otherwise!

 

[Thefailsafe2012]

Sigh! Ive still not had the pleasure of working on a TT yet!

 

[MDJ]

1666 ohms!

Poor reading that lol

 

[Deleted member 9648]

199.99999..........well chuffed with that one :smug:

 

[ruston]

199.99999..........well chuffed with that one :smug:

I saw you !

 

[Amp David]

There is allways one funny trucker aint they.. LOL

You knew what i meant tho

Not really, just saying it as it is.

But mine was 13 ohms if that helps

 

[Engineer54]

But surely, ....No-one can achieve TN values, or a sub 1 ohm Ra values from a Roded TT system!!! Well that's what some here would have you believe anyway!! Others just don't even bother and put all they're faith in a RCD!! lol!!

 

[DJ Ovengloves]

Should that be Ra?

Rrrr man.. There is all ways one that goes better.. Lol

 

[Amp David]

But surely, ....No-one can achieve TN values, or a sub 1 ohm Ra values from a Roded TT system!!! Well that's what some here would have you believe anyway!! Others just don't even bother and put all they're faith in a RCD!! lol!!

Course they do, they forget to disconnect any parallel paths.::

On the 13 ohms I mentioned, with bonding connected to gas and water supplies, when i took the measurement again, the Ra had dropped to 0.3 or there abouts

 

[MDJ]

Should that be Ra?

who Cares we all know what Dave meant

 

[Amp David]

I know I don't anymore:smug:

 

[Engineer54]

Course they do, they forget to disconnect any parallel paths.::

On the 13 ohms I mentioned, with bonding connected to gas and water supplies, when i took the measurement again, the Ra had dropped to 0.3 or there abouts

That would be Zs!! And i doubt very much that any bonding would pull your Zs down to 0.30 ohms. ....Not unless someone down the street has a PME connection, as both the water and gas main pipes generally have an underground protective anti corrosion covering...

 

[Amp David]

No seriously E54, i'm being genuine.

Zs at origin then i suppose.

 

[Engineer54]

No seriously E54, i'm being genuine.

Zs at origin then i suppose.

I don't disbelieve you, far from it. But there will be a reason for that dramatic fall in your Zs values, and the most likely one being PME connections along the street. Be they official or unofficial PME connections. ..lol!!

 

[Amp David]

Yes, you're right E54. Its only 3 small cottages that are TT, for some reason everything else has been converted at some point.

Water is still supplied in lead which pretty sure won't have any corrosion protection applied.

 

[Engineer54]

Yes, you're right E54. Its only 3 small cottages that are TT, for some reason everything else has been converted at some point.

Water is still supplied in lead which pretty sure won't have any corrosion protection applied.

You say that, but my parents house had a lead water supply, when we came to add an extension and dug out for the foundations, that lead pipe had a DENSO type tape (Grease impregnated tape, ..horrible stuff) wrap!!

 

[Amp David]

Oh yes, know the stuff well. Takes days to clean your hand up after using it!

Its just from other experiences really with working in close proximity to this place. Other houses have alterations done and only ever seen the lead naked in the ground.

Know what you mean though