Distributors earthing?

[Grayza]

Hi, Came across this the other day when looking to quote for a CU change. I can't figure out how the installation is earthed. There is bonding to the water pipe. I didn't take the cover off the existing CU as it wasn't practical when I visited. Measured a Zs of 0.3 from a socket. Its a terrace house, so wouldn't think its a TT. Does anyone have any thoughts?
Thanks

 

[SparkyChick]

Looking at the age, it may be using the water pipe as the earth. Is it a lead pipe?

 

[MJPD29]

Probably earthed off the water pipe as above

 

[Wilko]

I do like the idea that the bonded pipe here connects through to neighbour's pipes which are bonded there and the neighbour's installation has been updated to TNCS/PME. Giving your nice Zs result

 

[Midwest]

I'd ask the DNO.

 

[telectrix]

DNO being short for I Dunno, before my time. what plans there were were destroyed in 1941 by Luftwaffe.

 

[The Ghost]

Did you look around for an earth rod?

 

[Midwest]

Did you look around for an earth rod?

OP's username is Grayza?

 

[Grayza]

No sign of an earth rod. You may be onto something regarding water pipe and next door.
Think I'll go back and take the cover off the existing CU, disconnect the bonding and test Ze to see what I get

 

[Gavin John Hyde]

be careful if you have quoted for a visit by the seal fairy on this job... I saw one of these once and the DNO were upgrading the cut out anyway, but they said just as well as were they going to pull the fuse they would have refused due to something amiss inside. The fuse looked like it had degraded around the ends and almost become joined to the holder.they would have cut the wires outside hot and rejoined afterwards.

 

[Grayza]

I was airing on the side of caution. May get the customer call out the DNO to check and upgrade if possible

 

[Octopus]

How old is the house?

 

[buzzlightyear]

How old is the house?

its date of birth ,and when is next birthday party .

 

[buzzlightyear]

so wouldn't think its a TT. Does anyone have any thoughts?

the computer says yes.

 

[bigspark17]

May be a tncs, have you got a pic of cu with cover off? If you took it off?but get the customer to phone up supplier and request a new head (a little exageration say its cracked ) will get it changed pronto for you cu change.

 

[David Prosser]

I find when asking for an upgrade i helps if you say you are fitting electric showers and induction hobs.

 

[Octopus]

its date of birth ,and when is next birthday party .

There is an estate in Byfleet of 1950's houses where the earth is from a random socket to the pipework under the floor - not ideal!

 

[Grayza]

Not sure how old the house is maybe 50's or earlier. I didn't take the cu cover off, as wasn't convenient.
I will get the customer to request a new head.
Cheers for the replies everyone.

 

[bigspark17]

Not sure how old the house is maybe 50's or earlier. I didn't take the cu cover off, as wasn't convenient.
I will get the customer to request a new head.
Cheers for the replies everyone.

Puzzled how you can offer a price on cu change without taking the cover off?

 

[David Prosser]

Puzzled how you can offer a price on cu change without taking the cover off?

Million pounds per circuit. No need to remove cover.