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Discuss 10ml or 6ml main bonding conductors in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

T

Tapouchoke

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Hi guys :cool:

I have carried out works on a kitchen, altered cooker cct, altered socket circuit to suit new lay out
Installed rcbos to circuits as they have got socket outlets on them lest than 2oamps
All tested ect
16ml main tails 16ml main earth
now the main gas and water is only 6mml do I have to upgrade this or can I leave it as 6ml and put a comment / departure on the cert as code 4

All comments appreciated good and bad
Cheers
 
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A

adamh

  • Thread Starter Thread Starter
  • #3
asfaik anything over 4 if it is existing 10 if your fitting it.
 
T

Tapouchoke

  • Thread Starter Thread Starter
  • #5
Hi guys

Tncs supply main bonding existing, just altered the sockets and cooker circuits
Thanks for the Input
cheers
:cool:
 
yes i agree with spamwize 10mm except for t.t What i cant understand is how come peeps are still putting in 16mm tails when this changed to 25mm when part p came out????:confused:If i am wrong please correct me,but pages 31-33 of the Electricians Guide To The Building Regulations 2005 back me up on this?????
 
T

Tapouchoke

  • Thread Starter Thread Starter
  • #8
Sorry gents
16ml tails are original

You are right if installing new 25mm was just giving a brief insight into the supply parameters
 
M

Mike P

  • Thread Starter Thread Starter
  • #9
As I understand when undertaking new work on an old TNC instalation it should be part of the job to up the MET and main equipotential bonds 16mm and 10mm respectivlly.
 
D

DYCHE4230

  • Thread Starter Thread Starter
  • #10
As I understand when undertaking new work on an old TNC instalation it should be part of the job to up the MET and main equipotential bonds 16mm and 10mm respectivlly.

Really? Even if everything tests ok and all disc times, Zs's etc are met ???? That sounds a bit harsh!
 
M

Mike P

  • Thread Starter Thread Starter
  • #11
It's What I was informed to do when I did my 16th. TT supplies are 6mm Equipotential bonds
 
J

jaldred

  • Thread Starter Thread Starter
  • #12
You should really be checking your earthing arrangement and csa's of main and protective earthing conductors, before you carry out new installation or alteration.
If you earthing arrangement isn't up to min requirements it's a code 1 to me, not 4. There are (not very interesting) reasons for minimum csa's of earthing conductors within different earthing arrangements and not all directly related to meeting minimum Zs.
The main reason inadequate bonding is a code 1 and should be verified at quotation stage is this..... the NICEIC man will make you go back and put it right for free if he picks that job to look at and it's wrong, oh yeah and if another spark does work in that customers house and sees that the bonding is undersized and the customer tells him you were the last spark in he'll probably bad mouth you to the customer while quoting to upgrade the installation.
As a rule of thumb i'd always check the supply and arrangement before quoting the work.
 
T

Tapouchoke

  • Thread Starter Thread Starter
  • #13
hi guys
thanks again for the input any chance of spark doctor or dan givving ther view as it is much apricated
thanks
 
T

Tapouchoke

  • Thread Starter Thread Starter
  • #14
Again cheers for advice
Can we get a member who is good with the regs?
As I do work for the local authority and when you go into a job they want the bare minim to keep installation safe keep the cost down

TapouT
 
J

jaldred

  • Thread Starter Thread Starter
  • #15
You could call your regulatory body. The organisation you are registered with to self certify your work as required by Part P of the building regs.
Tell them that you are doing/have done work in a domestic dwelling with a PME supply - they will tell you that you need to upgrade the bonding to services (gas and water) to 10mm.

If you don't want to do that you can always invest in a copy of the regs and flick to page 134, reg 544.1.1 which basically says that main protective bonding conductors are required to be atleast half the csa of the main earthing conductor at a min of 6mm.... except in PME circumstances whereby you select the size of conductor based on the size of the main neutral conductor in table 54.8 (on the same page) 35mm Neutral or less = 10mm Main protective bonding conductor.

Hope this clarifies it for you?
 
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