Another earthing question

[raustin]

I've got a job to move an earthing cable. Reason being is the client if having a new boiler fitted which has to be sited on an external wall. On the other side of the wall is an earth cable which was installed about 6 months ago when they had a shower fitted in the upstairs barthroom.

The cable runs down the wall, around the out side of the house, before going into the garage to the CU.

Now I'm probably going to have to replace the whole length, so as this goes into a bathroom would it be notifiable?

The replacing of earthing isn't notifiable, but it extends into the bathroom. I'm thinking that it wouldn't be but just wanted your thoughts.

Also am I right in thinking that earthing cable has to be one length so I'm unable to to extend it using a copper through crimp?

So the only option unless there is enough length to re-route the existing cable, is to replace it?

Cheers Rich

 

[domestic spark]

Do not crimp replace, earthing is NON notifable if that is all your doing I'n special location

 

[raustin]

Thanks - yeah that's what I thought. Cheers

 

[Deleted member 26818]

What is the conductor to the shower for, is it neccessary?

 

[domestic spark]

I was thinking that, you only need to bond at water stopcock, and only do supplementary if the board I'n the property is non rcd, on the circuits covering electrical points I'n the bathroom.

 

[malcolmsanford]

installing or upgrading main or supplementary equipotential bonding is not notifiable as that is bonding, if it is a CPC then as it is in a bathroom it will be notifiable.

There is nothing in the BS 7671-2008 prohibiting you in joining an earthing or bonding conductor providing you adhere to section 526 in the regulations.

But as spin as asked what is this conductor doing. is it a supplmentary bond, and if it is then that should to be addressed as it should not really go back to the CU earth bar if that is deemed the MET. So is it a CPC for the shower?

 

[raustin]

Good point, never thought of that. I will check. I know that that client had the earthing upgraded in the house when the bathroom was re-done. I'm wondering if the sparky just upgraded that existing supplementary bonding in the bathroom. I know the shower is on and RCD but not sure abour the lights. If they are then there's no need for the supplementary bonding they had fitted. I'll check.

 

[domestic spark]

Do not crimp replace, earthing is NON notifable if that is all your doing I'n special location

Sorry poorly worded, should have said bonding! And I wouldn't extend just out of preference

 

[raustin]

Just looking through 7671 - 701.415.2 Supplementary bonding not required if circuits on an RCD. No probs with that. But say we have a shower on and RCD but the lights aren't, is the supplementary bonding still needed? Other than the shower, there are no other electrical items in the bathroom, the water pipes etc won't need bonding? or will they? Sorry for the confusion.
I was under the impression they they used to, but now they don't.
Earthing/Bonding sorry guys it confuses me know end.

 

[malcolmsanford]

If the lights are not RCD protected then yes you need to supplementary bond if the pipes in there are extraneous conductive parts(see the second part of the reg (i)

You may find that these are not ECP's and have no need to bond them, but that is unlikley but you could test them by using a wander lead back to the installations MET and then testing the with the IR setting on your meter each pipe in the bathroom, if you have a resistance of above 22k ohm then they are not classed as ECP

 

[raustin]

installing or upgrading main or supplementary equipotential bonding is not notifiable as that is bonding, if it is a CPC then as it is in a bathroom it will be notifiable.

There is nothing in the BS 7671-2008 prohibiting you in joining an earthing or bonding conductor providing you adhere to section 526 in the regulations.

But as spin as asked what is this conductor doing. is it a supplmentary bond, and if it is then that should to be addressed as it should not really go back to the CU earth bar if that is deemed the MET. So is it a CPC for the shower?

I thought (perhaps wrongly) that bonding cables had to one continous length.

 

[sjm]

A crimped joint is a permanent repair, when done correctly. As a permanent repair it then becomes an integral part of the cable. Therefore extending an earth or bonding cable using this method is perfectly acceptable as the extended cable is considered to be a continuous length.

 

[redface]

i think you should replace the earth and what is it for supp bonding going to db ???????? why? all that is needed is to put on to earthed pipe work and if bathroom is plastic pipe work no need to do that for 16th edition you are not doing anythig to circuits so no need to change for rcd protection.

if cable is main bonding yo will need to make it 16 mm because it is not protected at all by the sounds of it .

but the question is what dose the earth go to ?

 

[raustin]

OK - its all a little bit clearer now. I popped round yesterday afternoon. The client had it wrong thinking the earth was for the bathroom as that was when they had it done. The earth is actually from the mains water in the kitchen. It goes through the kitchen wall and then runs outside in conduit. It runs vertical up the outside of the wall and then over the top of the flat roof and down into the garage.

The conduit is in the way of where the boiler flue will be. I should be able to just move the conduit, but if not, will it be OK to extend the cable by crimping a length of 10mm on the end?

 

[telectrix]

continuous bonding refers to using a single cable ,say, for gas and water, at the neares point to the CU, the cable should not be broken/joined as then mr plumber could , in the course of doing some work, disconnect the bond and thus lose the bond to both services. in your case, i see no problem with a " permanent" joint, so as to break the cable's continuity, it would have to be cut.