No Main Earthing Condictor or Ze

Marcus Vaughan

-

Esteemed

Reaction score

240

• Jul 25, 2017

• #1

This has thrown me - obviously wet behind the ears.

A customer has asked me to carry out an EICR - but when I get there - it seems one has been done already....

It states 'no earth, no RCD'. Sure enough when I looked around there was a new service head from the DNO-very long tails?..

And no earthing conductor - as in no Ze......

So I phone the DNO - they say that yes they have not provided an earth - yes that they can provide one (TNCS). That I get....

But then they say you can just install an RCD main switch? That's what's thrown me - I know you can/should do that for TT systems - but that's based on some sort of earth electrode somewhere.

I can't find one?

Is this a case of install earthing electrode and RCD or get DNO to provide an MET?

 

Andy78

-

Mentor

Esteemed

Arms

Reaction score

12,559

• Jul 25, 2017

• #2

It's a case of both.
Knock in a rod and use an upfront RCD as a temp measure until the DNO provide their earth connection.

If the customer does not want the temp work done get them to sign a danger notification to cover yourself.

 

Midwest

-

Esteemed

Arms

Reaction score

10,616

• Jul 25, 2017

• #3

Marcus Vaughan said:

This has thrown me - obviously wet behind the ears.


Is this a case of install earthing electrode and RCD or get DNO to provide an MET?

Click to expand...

Yes install earth rod etc -TT supply, or ask the DNO cost of providing an earthing facility TNC-S. Think the latter would be better.

Edit; too slow

 

telectrix

-

Mentor

Esteemed

Arms

Reaction score

67,272

• Jul 25, 2017

• #4

But then they say you can just install an RCD main switch?

a case of some muppet at DNO talking through his arse. an RCD should never be used as a substitute for an earthing system. only as a back-up with a high Ze on a TT.

 

Gavin John Hyde

-

Esteemed

Arms

Patron

Reaction score

5,173

• Jul 25, 2017

• #5

my understanding is the dno does not have to provide an earth, if however they do supply one , then they have to maintain the earth. like wise a alteration such as a new service head then after it should not be left in any worse situation than before. so if they changed the service head and previously there was a earth connection and now they have left it without one then you arguably can force them to make it safe. be that provide an earth connection or install a tt rod. it should not come down to the homeowner to get an electrician in as the dno have in effect made the system unsafe. im sure somewhere in the various laws there will be something about this.

 

Midwest

-

Esteemed

Arms

Reaction score

10,616

• Jul 25, 2017

• #6

Perhaps the install had an earth rod, aka the old lead water pipe, which has since been removed?

bY THE BYE gAVIN, CAN I JUST BRING YOU TO TASK ON YOUR GRAMMAR.

 

Gavin John Hyde

-

Esteemed

Arms

Patron

Reaction score

5,173

• Jul 25, 2017

• #7

Midwest said:

bY THE BYE gAVIN, CAN I JUST BRING YOU TO TASK ON YOUR GRAMMAR.

Click to expand...

@Midwest point taken, My grammar is sometimes good sometimes bad, depends if i am tired and typing the way i think things in my head.. being a country bumpkin from Somerset just being able to speak English coherently is a sign of intelligence. writing and grammar, well that is a bonus...

 

telectrix

-

Mentor

Esteemed

Arms

Reaction score

67,272

• Jul 25, 2017

• #8

my grammar died donkeys years ago. she buried with granddad

 

Midwest

-

Esteemed

Arms

Reaction score

10,616

• Jul 25, 2017

• #9

Wasn't funny for grammar!