TN-S Earth clamp??

[La Poste]

What are your thoughts on this?

ELI reads 0.15 Ohms, the lowest I have ever seen but I haven't seen that many.

Thanks.

 

[telectrix]

DNO should be called out to fit the correct connection to the cable sheath. that 951 and the connection to the earthing conductor is iffy to say the least.

 

[La Poste]

If the DNO comes out could they refuse to repair the earth and remove it if the water is not bonded.

The gas is bonded ( I think to the wrong side of the meter, the meter is inside a cupboard, I need to double check this) but the water is not bonded.

It's not TN-C-S but I wonder how dimly the DNO would look upon this.

Thanks.

 

[telectrix]

well, i would start by bonding the water before calling in DNO.

 

[La Poste]

Now that is much easier said that done!!!

God knows how I'm going to manage that.
It's all concrete floors and laminate flooring with the DB in the middle of the house.

The house has been extended many times in an outward direction from the DB and their is no accessible avenues left to it.

I think I really need to explain all this to the customer before I do anything else.

 

[Geordie Spark]

Now that is much easier said that done!!!

God knows how I'm going to manage that.
It's all concrete floors and laminate flooring with the DB in the middle of the house.

The house has been extended many times in an outward direction from the DB and their is no accessible avenues left to it.

I think I really need to explain all this to the customer before I do anything else.

Console yourself with the fact that if it were easy, eveyone would be doing it !!

 

[mechelec]

The chances are the DNO may not notice or even care about the water bonding. What they may say is that the installation was not supplied with an earth terminal and someone has tampered with their cable to get one. They will then procede to remove the clamp and leave the installation with no earth and the cutout fuse removed. You (or the customer) will then have to pay for a PME terminal to be supplied (if PME is available in your area). They may provide one but it really depends who you get.
With such a nice low Ze I would suggest if it aint broke dont fix it.
Note it on PIR, EIC, or MW as appropriate

 

[Deleted member 26818]

There's a good chance, that it's not TN-S.
Looks like a split concentric cable, and it appears that both the neutral and earth conductors have been terminated in the neutral block.
I'd consider removing the clamp, and terminating the earth in the neutral block.

 

[mechelec]

There's a good chance, that it's not TN-S.
Looks like a split concentric cable, and it appears that both the neutral and earth conductors have been terminated in the neutral block.
I'd consider removing the clamp, and terminating the earth in the neutral block.

I would say that the installation was orininally a TT earthing system and someone has added the clamp.
I have never seen any split concentric paper insulated lead sheathed cable around here before.
It was used many years ago when DC was distributed, it was concentric three phase cable interesting stuff to work with by all accounts.

 

[Engineer54]

There's a good chance, that it's not TN-S.
Looks like a split concentric cable, and it appears that both the neutral and earth conductors have been terminated in the neutral block.
I'd consider removing the clamp, and terminating the earth in the neutral block.

I can see where your coming from looking at the photo again, but i personally haven't seen a concentric DNO cable of the same make-up as shown. never seen a lead covering incorporated within one either, sort of defeats the point of a concentric cable.

What it looks like to me, is a badly terminated cable, the orientation of the cores being wrong and the terminator deforming/crossing cores to line up on the cut-out fuse and neutral block. The breakout heatshrink trousers making it look worse from being twisted at the breakout position.
But i could be wrong!! ...lol!!

 

[GLENNSPARK]

Just looking at it ...i wonder if the IP rating on the cutout side is compromised....looks like another entry in at the top next to the red tail..............

 

[GLENNSPARK]

the neutral block definetely is as you can see brass......

 

[Deleted member 26818]

Is it lead sheathed, or has something been wrapped around the cable, perhaps to protect the cores from the clamp?
I'm also wondering why the henly block fed from the meter has been sealed?

 

[pushrod]

What is that 2nd large Green & Yellow going into the CU? Just wondering if that is your water bond that is going in there instead of to the MET.

 

[Knobhead]

At a rough guess that clamps been there 20+ years looking at the way the cables been dressed. It’s probably been there since day one.
Don’t worry about it and for god’s sake don’t play about with it.
Under the bituminised tape around the cable crotch will be resin-impregnated tape, over the years it gets brittle. Crack that and damp will get in to the papers. Then after a while BANG!

Get the rest of the earthing up to scratch.