Flippin!!! joiners!

[Hawk]

Had a joiner in doing some work and he managed to screw into the existing main earth which is a 25mm cable in a tt system. I tested it and I'm getting a Ze of 0.26 and PEFC of 9A. Should I replace the cable?

 

[davesparks]

Why test it if you already know it's damaged?
Just get on and fix it

 

[telectrix]

that pefc iswrong. it should be more like 900A +.

 

[PEG]

...Too fast for me,Tel...

 

[Andy78]

.....or the Ze is wrong and it should be 26 ohms. I'd be impressed with 0.26 for a TT.

 

[Hawk]

Sorry 26 ohms!

 

[Hawk]

Well the only way I know it's damaged is that I'm getting continuity between a screw and the main earth. To what extent it's damaged I don't know.

 

[davesparks]

Well the only way I know it's damaged is that I'm getting continuity between a screw and the main earth. To what extent it's damaged I don't know.

The amount of damage is pretty irrelevant. Damaged is damaged and needs fixing

 

[Hawk]

But say I didn't know about it Dave? It wouldn't be found once testing is carried out would it?
I agree with you that it should be replaced and I will. I was going to go a step further and put new rods in.

 

[Risteard]

Why a 25mm^2 Earthing Conductor with a PEFC of 9A?

 

[Hawk]

It was like that originally. Not sure what the thinking was behind it!

 

[davesparks]

But say I didn't know about it Dave? It wouldn't be found once testing is carried out would it?
I agree with you that it should be replaced and I will. I was going to go a step further and put new rods in.

If you didn't know about it then you wouldn't even be thinking about what would happen if you didn't know about it. But you'll need a philosophy forum for that!

Replaced maybe, or repaired, depends on the exact situation and what will be least disruptive.

 

[Hawk]

I mean in general on any job.

 

[DPG]

Surely it would be the same on any job - if a cable is known to be damaged then you fix it? Daz

 

[egg67]

Fix it, it was the joiners f--k up so he will have to pay you, simple


Sent from my iPhone using Tapatalk

 

[Lucien Nunes]

If it's damaged it needs fixing but the screw isn't the cause of the 26Ω. I don't think you can sever a 25mm² with any woodscrew known to man, but to have any impact on a real world Ra there would have to be a sliver of copper left smaller than a human hair.

 

[LankyWill]

grab the pliers and black tape. Twist and tape terry!!!

 

[TJ Anderson]

stick a BS951 tag under the screw head!! Sorted ☺