2 Questions

[iamgary25]

what do you think? Are you an electrician?

i would gland into the metal CU as its extraneous conductive part, i can't find why you can't, you ask for help and just get mocked, i see why people say don't go on here

 

[Leesparkykent]

i would gland into the metal CU as its extraneous conductive part, i can't find why you can't, you ask for help and just get mocked, i see why people say don't go on here

Your not being mocked...I just asked a question. I doubt the metal CU is an extraneous conductive part! If you are making it a TT system at the far end then you need to isolate the suppliers earth from this part of the installation.

 

[iamgary25]

I'm getting the impression you shouldn't connect straight into the metal CU, which doesn't tie up with other advice i've been told, i'm trying to do the job correctly and have had a look in the book but couldn't find anything thats why i ask... thanks simon, didn't know those were available

 

[tomspark93]

i would gland into the metal CU as its extraneous conductive part, i can't find why you can't, you ask for help and just get mocked, i see why people say don't go on here

The metal casing of the consumer unit would still be earthed through the TT earthing though.

 

[Leesparkykent]

I'm getting the impression you shouldn't connect straight into the metal CU, which doesn't tie up with other advice i've been told, i'm trying to do the job correctly and have had a look in the book but couldn't find anything thats why i ask... thanks simon, didn't know those were available

How come you want to make the remote end TT?

 

[Simonslimline]

i would gland into the metal CU as its extraneous conductive part, i can't find why you can't, you ask for help and just get mocked, i see why people say don't go on here

I think reading this that the answer is clear to be honest.

 

[iamgary25]

Your not being mocked...I just asked a question. I doubt the metal CU is an extraneous conductive part! If you are making the it a TT system at the far end then you need to isolate the suppliers earth from this part of the installation.

i meant the steel of the SWA not the metal CU, sorry

and where can i find this in the book please?

 

[Simonslimline]

i meant the steel of the SWA not the metal CU, sorry

and where can i find this in the book please?

It's basic electrical theory is it not?

Potential difference!

 

[iamgary25]

How come you want to make the remote end TT?

As its about 70 something metres away and will be cheaper to install 2 core as its 25mm

 

[Leesparkykent]

i meant the steel of the SWA not the metal CU, sorry

and where can i find this in the book please?

Haven't got the book near me as it's in the office but would have a guess that it's in chapter 54.

 

[iamgary25]

It's basic electrical theory is it not?

Potential difference!

Basic but thats what i've been told to do by other electricians
and wouldn't connecting mean there at the same potential difference

 

[Leesparkykent]

As its about 70 something metres away and will be cheaper to install 2 core as its 25mm

What is at the far end? Shed, garage, house, etc.

The price difference between 2core and 3core will be about £1 a meter so about £70. You will more than likely recoup this in labour/material if you don't make the far end a TT arrangement.

Is there anything extraneous at the far end?

 

[Blademan_98]

Haven't got the book near me as it's in the office but would have a guess that it's in chapter 54.

542.1.3.3?

 

[iamgary25]

542.1.3.3
Where a number of installations have separate earthing arrangements, any protective conductors common to any of these installations shall either be capable of carrying the maximum fault current likely to flow through them or be earthed within one installation only and be insulated from the earthing arrangements of any other installation.

 

[Leesparkykent]

542.1.3.3?

Could be I don't have the book around me ATM :smile5: