Twin and earth used as meter tails

[plancaster]

So i went to a job and i came across this the house is 19yrs old and apparently this is how it was when they moved in from when it was built its the twin and earth that runs to the consumer unit I am looking at there is some 10mm earth to the gas meter that has been fitted at a later date.

 

[davesparks]

What is your question?

 

[plancaster]

Just wondering if anyone else had seen any thing like it

 

[bill01803]

According to forums it appears to be standard practice

 

[pc1966]

Yes, it is quite common (as far as houses that have longer than usual tails that is) but not something I would say is good practice due to the usual lack of physical protection along the sort of route often taken.

 

[plancaster]

Yes, it is quite common (as far as houses that have longer than usual tails that is) but not something I would say is good practice due to the usual lack of physical protection along the sort of route often taken.

The meter is only2mts from it I am going to drop some 16mm earth from the consumer unit to the met

 

[Mark Wright]

I thought I read that if it's a longer run your supposed to use SWA?

Also at guess that's not Ref C so 16mm won't be capable of 100A.

 

[davesparks]

The meter is only2mts from it I am going to drop some 16mm earth from the consumer unit to the met

Why are you going to install a 16mm earth?
[automerge]1592079514[/automerge]

I thought I read that if it's a longer run your supposed to use SWA?

Nope, there is nothing that stipulates cables over any particular length need to be SWA.

Meter tails cannot be longer then 3m so a distribution circuit must be installed if the CU is further than this.
[automerge]1592079604[/automerge]

Just wondering if anyone else had seen any thing like it

Yes, lots of times, the exposed insulation is not acceptable but other than that if it is of suitable size and less than 3m it complies.

 

[Mark Wright]

Ok still learning

 

[plancaster]

Hi the 16mm earth is that not the std main earth size from a consumer unit to the DNO MET forgive me if i am wrong

 

[Baddegg]

Earthing system type and adiabatic mate?....

 

[plancaster]

hi its tncs mate

 

[Baddegg]

I was trying to point you in the right direction as to why you may not need a 16mm main earth mate ?

 

[plancaster]

I was trying to point you in the right direction as to why you may not need a 16mm main earth mate ?

Hi Mate am i a correct thinking that a 16mm earth is correct i just can not see that the cpc in a bit of twin and earth is adequate

 

[Baddegg]

Can’t remember the table number off the top of me head mate but it’s in 7671 for main earth sizing or as above use the adibatic....I’d go with 7671 for design selection but do the adibatic if unsure of someone else’s work ?.......