main bonding

[ample current]

Is it ok to clamp 10mm earth cable to the gas pipe then to the water pipe and then to the Installation earthing terminal or do the have to be sepatete cables, the cable runs are about 3m.

Many thanks in advance
Mark

 

[La Poste]

Is there a metallic waste pipe?

Is the water supply taken from a different source than from the main water supply?

Is there any extraneous conductive parts on the sink?

Does the utility room also contain a bath or shower?

Just a quick question, why are you asking if the utility room also contains a bath or a shower?

Thanks.

 

[jamie-spark]

John if they are extraneous conductive parts then yes they should be bonded, reg 4113.1.2 (iii).

Not sure why you want to bond them on exit mate, but certainly on entry.

As for the 50mm SWA well normal SWA will give you copper eqiv of about 32mm and XPLE dead on the 25mm required in reg 544.1.1

Had to edit that of course 50mm 2 core XPLE would only be about 22mm copper eqiv and therefore not suitable

It is my. Understanding when swa is used as a bonding conductor we work out its copper equivelent which for a 50mm 2core xple works out at about 8.5mm when its used as an earthing conductor it is 22mm .

 

[R4BOE]

i think your correct on this point jamie-spark

 

[i=p/u]

theres a data sheet on the forum for this, or you can use the (bgb) book to work this out..

 

[R4BOE]

Where can we find it on the forum I=p/u would be mega handy !

 

[i=p/u]

hmm not you got me blood pumping, ''now where did i come across that..

 

[i=p/u]

i think its a sticky...

 

[i=p/u]

http://www.electriciansforums.net/e...ulations/23288-can-we-use-armour-swa-cpc.html here, i was shown how to do it from the regs book and is real easy

 

[jamie-spark]

Thats as a cpc mate not a bonding conductor

 

[R4BOE]

hi thanks for the chart

I=P/u but that chart is for the use with armouring as a CPC not a bonding conductor, as a bonding conductor the copper equivelent is less as that shown on this chart chart on the forum, i think it is to do withy the resitivity of the steel etc a bonding conductor the csa must be 8 times the value of the Copper equivelent thesfore a 10mmsq copper bond requirews the armouring to be 80mm steel CSA, see the top of page 42 of GN8 as this is where this is stated !

if you have access to it the electrical saftey council techincal manual A 57-21 goes into the subject in some depth

 

[sparky198]

I've been reading the regs book and come across reg 411.3.1.2 which starts "In each installation main protective bonding conductors (note the s on the end indicating more than 1) complying with chapter 54......." you can also look at the pictures in the OSG which show seperate bonding conductors.
Doesn't say you can't use 1 continuous cable though.

Interpret as you will. Wish it was all written so there was no ambiguity!

 

[i=p/u]

give me chaance , but is table 54.7 pg 162 relating to this we query of yours???

 

[R4BOE]

no it in relation to swa armouring used as a main bonding conductor not protective conductors

 

[i=p/u]

kk ive still learnt something.. as its to do withswa armour as protective conductor..

isit main protective bonding conductor or equopotential bonding conductor???

 

[R4BOE]

main protective bonding conductor !

honest mate i dont think many people realise this, we in the past have used armouring on cables as a main bonding conductor from sub mains before thinking it was sufficant and it has not been the case,