High TNS readingssssss

[Bradley6969]

TNS system
60947-2 main switch
60898 double pole 63amp MCBs that feed some caravan boxes now some circuits I can get below the disconnection times of 0.56 ohms but some are 1.22 ohms now I’ve tried changing glands anything else I can do apart from TT the hook up unit? Or do you need upfront RCD

If not change the distribution unit feeding boxes with RCD and Rod it

 

[Nigel]

Ok for the more pedantic ones;
I always like to ascertain what is causing the problem first before coming up with a solution

It was never installed right in the first place.

 

[ipf]

It'd be useful to know how old the installation is.

 

[Charlie_]

It was never installed right in the first place.

How do you know that?
Op said he has high Zs readings but has done nothing else testing wise

 

[Nigel]

How do you know that?
Op said he has high Zs readings but has done nothing else testing wise

Because I read all the posts.

 

[Charlie_]

Because I read all the posts.

Yes me too

 

[Charlie_]

No dead testing currently occupied

How did you manage to change glands without switching off the power??

 

[davesparks]

It was never installed right in the first place.

It would be good if the OP could clarify the test results and what they mean by original values. Their other threads recently about this same job make me think these original values refer to the EICR conducted before they started the remedials rather than referring to an EIC.

 

[ipf]

Because I read all the posts.

Come on, my mate. The OP's only posted 4 times, with not a great deal of info......and his last one was at 10am.
We know SFA about it, really.

 

[richy3333]

op- HELLO?????????????? (echo, echo) empty room!

 

[buzzlightyear]

op- HELLO?????????????? (echo, echo) empty room!

padded cell.

 

[richy3333]

@buzzlightyear I think we drink similar shandy

 

[PEG]

I'm having an awful holiday,here.....lights and telly keep going off...

 

[Bradley6969]

Not changed any glands yet and only going by EICR at the moment, so I’m getting 1.13 ohms on earth loop but if I go to PSC L+N is 0.26 so may get round it that way as will still disconnect in required time, have 63amp 60898 MCB at mains DU then feed the caravan boxes

 

[Bradley6969]

It would be good if the OP could clarify the test results and what they mean by original values. Their other threads recently about this same job make me think these original values refer to the EICR conducted before they started the remedials rather than referring to an EIC.

Yes sorry

 

[Bobster]

TNS system
60947-2 main switch
60898 double pole 63amp MCBs that feed some caravan boxes now some circuits I can get below the disconnection times of 0.56 ohms but some are 1.22 ohms now I’ve tried changing glands anything else I can do apart from TT the hook up unit? Or do you need upfront RCD

If not change the distribution unit feeding boxes with RCD and Rod it

Not changed any glands yet and only going by EICR at the moment, so I’m getting 1.13 ohms on earth loop but if I go to PSC L+N is 0.26 so may get round it that way as will still disconnect in required time, have 63amp 60898 MCB at mains DU then feed the caravan boxes

You're contradicting yourself.

PSC L+N is 0.26 so may get round it that way as will still disconnect in required time

What do you mean by this then?