Eicr bonding

GarryJ · Feb 24, 2015

Evening all.

Just wondered what everyone's sequence was for inspecting/testing main bonding when carrying out EICRs?

I was at property recently and carried out a full 100% EICR. Everything was satisfactory and up to scratch - new 17th Ed split board / all circuits RCD protected there was a couple of code 3 items for no earth sleeving in pendants etc.

The property had both main water and gas services (TNC-S system) There was an isca block at the origin with 16mm earth going into consumer unit and 2 x 10mm earth cables disappearing under floor.
The main water stop cock according to the tennant was under the utility room floor and the gas box was on the side of the house but no bonding visible inside external box. (Main gas pipe also comes into property under floor.)

I classed these as a Code 2 and requiring further investigation. On front page of certificate I stated this in the agreed limitations stating it was unaccessible.

However since I was last there British gas has been in to provide gas safe certificate and can not do this as they also say they can not confirm main gas is bonded?

Thanks in advance for any help

telectrix · Feb 24, 2015

davesparks said:
Whereabouts in GN3 is it 'bandied about'?

There is a figure of 0.05 given as a suggested maximum value for the resistance between the cable termination at the bs951 clamp and the pipe itself.

good post. that 0.05 figure is misunderstood by so many sparks as being a max. value for the resistance of a main bonding conductor.

7029 dave · Feb 24, 2015

Simple physics, bigger the csa the less resistance.

Leesparkykent · Feb 24, 2015

Murdoch said:
Can you have C2's on a satisfactory report - I don't think so......

Thats why I was asking the OP but he didn't reply :icon12:

davesparks · Feb 24, 2015

7029 dave said:
Simple physics, bigger the csa the less resistance.

But why 25metres? Where in the regulations does it say anything about the resistance of a main bond?

baldsparkies · Feb 24, 2015

spark 68 said:
I thought you's only took the wheels and the radio ?

And I thought formula 1 teams had snapped them all up for the pit stop tyres changes.
Apparently there the fastest boys in the world !!

GarryJ · Feb 24, 2015

I meant the rest of the installation was satisfactory - It was not a pile of mince. Usually by the end of a 100% EICR you get a pretty good idea of the quality of the install.
Cheers

Des 56 · Feb 24, 2015

Garry,I think my approach would mirror tels post

The installation is of a good standard,the bonding cables exist at the consumer unit,the continuity test would ensure they were connected to the service they were intended for
Given the positives that you have stated I think it is a bit of over zealous to expect the installation to be considered potentially dangerous by coding it 2 but its your opinion that matters

dnjr · Feb 25, 2015

Hi telectrix hands up ive misunderstood this.
is there a figure to use to check bonding ?
ta

LeeH · Feb 25, 2015

Delete

I put 0.05 without reading all the thread

Charlie_ · Feb 25, 2015

Length of run x 1.83 mOhms.

GEOFF S · Feb 25, 2015

davesparks said:
But why 25metres? Where in the regulations does it say anything about the resistance of a main bond?

Where it asks for equivalent conductance

Cheers

davesparks · Feb 26, 2015

......

GEOFF S · Feb 26, 2015

davesparks said:
View attachment 28113

......

I think there are quite a few pretentious and conceited individuals on this forum, very good at dishing out, unfortunately not so good at receiving it.

Cheers