Routing of meter tails

[stevethesparks]

I was confused as thought the CU should be within 3 metres of the meter, unless I've misread something?
Edit: if directly fed from the meter

 

[westward10]

His intention is to fit circuit protection at the source.

 

[Midwest]

I'm confused, I understand a distribution circuit only requires disconnection time of 5 secs (411.3.2.3), but does not reg 522.6.202 apply?

Edit; assuming cables are installed below flooring of less than 50mm.

And my query Westward?

 

[Octopus]

I can't see what fitting 16mm twin and earth would help? Especially as the cpc size would be too small

 

[westward10]

And my query Westward?

The OP states they are not buried in a wall but yes Reg 522.6.201 would come into play. Fit swa

 

[Deleted member 26818]

522.6.201 can be complied with in a number of ways.
As far as I am aware, RCD protection is not one of them.

 

[Ian1981]

I can't see what fitting 16mm twin and earth would help? Especially as the cpc size would be too small

The cpc in the 16 mm would only be the distribution circuit cpc and not the main earthing conductor (that’s if a suitable sized conductor will be installed at the origin) so depending on the zs at the consumer unit it will most likely be satisfactory for use as a cpc only.
Tho If your bonding conductors are connected at the consumer unit then it’s another story....

 

[Octopus]

Tho If your bonding conductors are connected at the consumer unit then it’s another story....

hit, nail and head .....

As we don't have all the information, my observation stands...

 

[westward10]

Doesn't matter the 16.0 is not relevant in this case.

 

[PEG]

Going away from who has the biggest core...

Is the OP concerned about the vulnerability of the animal wagging parts,where they have been installed?

I get the feeling,this may be his concern.

 

[leep82]

If it is a TN system an rcd is

Going away from who has the biggest core...

Is the OP concerned about the vulnerability of the animal wagging parts,where they have been installed?

I get the feeling,this may be his concern.

sorry for the late reply, yes this is a concern. It is a TN system NOT TT so as pointed out earlier in the thread RCD protection not required.

 

[DPG]

Animal wagging? I've checked the regs and I can't find this.

 

[leep82]

I can't see what fitting 16mm twin and earth would help? Especially as the cpc size would be too small

A seperate cpc would have been run along with the T&E

 

[Midwest]

sorry for the late reply, yes this is a concern. It is a TN system NOT TT so as pointed out earlier in the thread RCD protection not required.

Thought you said the tails were installed under floorboards, are they more than 50mm...?

 

[leep82]

Thought you said the tails were installed under floorboards, are they more than 50mm...?

Yes they are although i didnt install them myself

 

[Midwest]

Which goes back to the dilemma of you first energising part of an installation, someone else has installed. Not trying to be clever, just wonder how you would cover yourself on the EIC, not having inspected after installation.

Must be a solution, as this happens more than not?

 

[leep82]

Which goes back to the dilemma of you first energising part of an installation, someone else has installed. Not trying to be clever, just wonder how you would cover yourself on the EIC, not having inspected after installation.

Must be a solution, as this happens more than not?

Fully agree and as mentioned if it wasnt an install previously started by another electrician i trust i would not have taken the job. I guess im more concerned about the use of the double insulated meter tails. Althought they are ran together and at a suitable depth ( 50mm from floor and ceiling ) i still worry that either conductor could become damaged and the fault not clear, the use of a T&E or SWA would surley reduce this with all conductors being enclosed together.

 

[DPG]

I still don't see how T&E would be an improvement??

 

[leep82]

Which goes back to the dilemma of you first energising part of an installation, someone else has installed. Not trying to be clever, just wonder how you would cover yourself on the EIC, not having inspected after installation.

Must be a solution, as this happens more than not?

Fully agree and as mentioned if it wasnt an install previously started by another electrician i trust i would not have taken the job. I guess im more concerned because of the cable

I still don't see how T&E would be an improvement??

wouldnt you have more chance of hitting multiple conductors in a T&E, say with a nail or screw and in turn creating a short circuit causing my OCPD to operate. The way that the cables are installed shouldnt give rise to this happening, but whats stopping Mr Builder sending a 3” screw into a floorboard?

 

[DPG]

You cant rely on t&e to perform like that.

And as long as the cables are correctly installed then screws aren't a problem. You might as well say what if he uses 6 inch nails.