Zs on TT

[i=p/u]

What is the point in carrying out zs on TT system other than verifying a loop.
We got an Ra of 14.8 but when all bonding is in place it comes down to 1.9 ohms for most circuits zs results. I just don't see the point if rcd protected .

 

[i=p/u]

I'm not saying don't test it but the results 9.8 times out of ten are irrelevant on a tt system cause they are over the max zs value if breaker/mcb.

close this thread

 

[Sintra]

close this thread

No I quite like it

 

[i=p/u]

Mdj says he's lost, I'm lost and I started it . But you all starting to agree after you slept on it. Lol

i didn't sleep

 

[Zebra Stripe]

i=p/u, while I agree that the values are somewhat irrelevant as regards disconnection times, what Sintra and hawkmoon are trying to point out is that without the "live" Zs test the connections at the ocpd and RCD and the devices themselves are completely missed out with just Ra & R1+R2 tests.

 

[i=p/u]

And I agree too ,

 

[i=p/u]

Right back to work .

 

[i=p/u]

And it all came about when my boss said them zs readings are no good. And I explained to him. What I tryed to confirm here, but everybody just laughed . Hehehehe

 

[Zebra Stripe]

Hey, dont worry about people laughing at you, an inquiring mind is a good thing..your post made me think.:smilewinkgrin:

 

[MDJ]

Hey, dont worry about people laughing at you, an inquiring mind is a good thing..your post made me think.:smilewinkgrin:

That's because like me you do the full range of tests with instruments and do not calculate like others LOL.

 

[Guest55]

i see i=p/u is drowning in a pool full of his own thread fail.........

here , let me help.....

 

[Silly Sausage]

I think you're too late biff...
http://www.electriciansforums.co.uk...um/84593-schneider-vigi-units.html#post862184

Hope for his sake he hasn't trashed owt!

 

[i=p/u]

I just like to know things inside out and I don't mind getting them wrong to get them right,

but it I was right anyway..

 

[Marvo]

No I quite like it

I was laughing about this thread at random moments during the day. I though it was at least worth some debate which I see it got eventually.