Bit of help with a TT installation please...

[timo1]

Hi, i'd appreciate a bit of help with this one if poss. Went to look at a job on a TT installation, property was a single story bungalow and has since been developed with another floor. As usual everything has been immaculately decorated, floors laid etc..and no thought given to the electrical services!! New owner is very realistic and happy to upgrade bonding, along with a decent bit of extra work.

I have checked and there is a 16mm earth from the earth stake/rod outside which goes directly into the C/U. there is no bonding present on either the water or gas. C/U is in the middle of the house, gas is positioned on the outside wall about 5 - 10 metres from the stake.

Ideally I would like to run bonding from the gas and water to the C/U but this is not an option, I'm all for a challenge but the route has me beat.

One solution I thought of would be to create a MET near the gas position and join the main earth and gas/water together, possibly in a weatherproof enclosure, obviously clearly labelled at source and at C/U. Property is RCD protected also.

Not ideal I know, looked at regs and can't see anything directly against it, any thoughts? Thanks in advance.

 

[telectrix]

so, what you are saying is that you will fit a MET close to the gas and water, use the 16mm from CU to MET, then MET to rod, and bond gas and water to MET. if so, as you say, not ideal, but as long as correctly labelled up, and readings taken. sounds like a plan

 

[JD6400]

Interesting ? Can not think why not , at the moment that is !

 

[sedgy34]

its back to the DB im afraid otherwise walk away from other works

 

[telectrix]

i hope all circuits are protected by a 30mA RCD, as it's a TT system.

 

[timo1]

Great news, thanks for taking the time to help, time to do some sums for the estimate!

Yes mate all protected, one RCD up front, again not ideal, maybe able to persuade to upgrade (that rhymes)

 

[telectrix]

its back to the DB im afraid otherwise walk away from other works

don't know of any reg. that says a MET can;t be remote from the CU. esp as he's got a 16mm when the minimum is much less for a TT system

 

[GLENNSPARK]

cant see what would be up with it.....would be all at the same potential....

 

[sedgy34]

don't know of any reg. That says a met can;t be remote from the cu. Esp as he's got a 16mm when the minimum is much less for a tt system

question! Would you pass it off by doing an eicr as hes going to do what hes suggested ?????????????

 

[telectrix]

can't see a problem. wait till malc, eng54, or IQ comments.

 

[J25GTi]

Doesn't it have to be bonded at the origin of the installation? therefore a remote MET would not comply?

 

[GLENNSPARK]

surely common sense has to prevail here....what if its flats for instance?...with an MET at the service head....goin out to C/Us in each flat?.....

 

[sedgy34]

can't see a problem. wait till malc, eng54, or IQ comments.

i assume thats a no then tel

 

[telectrix]

i will await the opinion of greater minds than mine. was thinking of flicking through the bgb, but a more pressing matter requires my attention. beer glass is empty.

 

[sedgy34]

Doesn't it have to be bonded at the origin of the installation? therefore a remote MET would not comply?

thats the debate