bonding

[wannabesparky]

if a gas meter is in an outside box, and the gas pipe runs up the outside wall and runs into the house just under the landing floor boards, at what point do you put the bonding clamp?

 

[Des 56]

As near as practical to the point of entry,the landing
Try to fix it where it would be available for future inspections

 

[Gravid]

Stick it in the box if you can get it there.

 

[Mac]

Should be 600mm from point of entry or as Des56 said,as near as practical.Make sure you note it on the cert.

 

[Gravid]

How is under the floor boards practical ? Certs get lost in house moves, so i think consideration for the next man has to be taken into account.

Suppose you could screw the Saftey Electrical Connection-Do Not Remove label on to the skirting board.

 

[Mac]

How is under the floor boards practical ? Certs get lost in house moves, so i think consideration for the next man has to be taken into account.

Suppose you could screw the Saftey Electrical Connection-Do Not Remove label on to the skirting board.

No-one said about putting it under the floorboards mate.The connection should ideally be within 600mm of point of entry to the house(customer side)or as near as practical if that's not possible.It needs to be noted on the cert as to where the connection was made.

 

[Gravid]

if a gas meter is in an outside box, and the gas pipe runs up the outside wall and runs into the house just under the landing floor boards, at what point do you put the bonding clamp?

Yes he did.

 

[Spudnik]

Bond it in the meter box if its easier.

Within 600mm of the point of entry, is IF its bonded in the house.

 

[Des 56]

Bond it in the meter box if its easier.

Within 600mm of the point of entry, is IF its bonded in the house.

Sorry I will have to take issue with yourself on that quote

The Main protective bond to the gas should be made in the house within 600mm of the point of entry or as near as practical to the point of entry, ( Internal)
If the connection is made outside,it is extending the equipotential zone to the outside
This would not be ideal in my view if there is exposed pipework and a pme supply
If the incoming neutral was at a higher potential with regard to true earth, then a possibility of shook would be present

 

[Spudnik]

The MEB should be within 600mm of the service meter OR at the point of entry, if the service meter is external and made before any branches in the pipe work.

No where does it state that it should be within 600mm of the pipe entering the property.

I should have said that I always bond within 600mm of it entering the property.

 

[Des 56]

The bond shouod be made within 600mm of the service meter agreed
It then goes on to say that if the meter is external then the bond should be made as near as practical to the point of entry,that was what I advised
Given that the connection shall either be made at the point of entry or within 600mm of the service meter when the service meter is internal
This advise therefore rules out making the connection in an external gas meter box (in my opinion )

 

[Spudnik]

The bond shouod be made within 600mm of the service meter agreed
It then goes on to say that if the meter is external then the bond should be made as near as practical to the point of entry,that was what I advised
Given that the connection shall either be made at the point of entry or within 600mm of the service meter when the service meter is internal
This advise therefore rules out making the connection in an external gas meter box (in my opinion )

I do agree with you there Des, but it doesnt say that it cant be.

And yes, I doooooooo love splitting hairs :

 

[Mac]

411.3.1.2 Protective equipotential bonding
In each installation main protective bonding conductors complying with Chapter 54 shall connect to the main earthing terminal extraneous-conductive-parts including the following:
(ii) Gas installation pipes
542.2.4 A metallic pipe for gases or flammable liquids shall not be used as an earth electrode. The metallic pipe of a water utility supply shall not be used as an earth electrode. Other metallic water supply pipework shall not be
used as an earth electrode unless precautions are taken against its removal and it has been considered for such a use.
544.1.2 The main equipotential bonding connection to any gas, water or other service shall be made as near as practicable to the point of entry of that service into the premises. Where there is an insulating section or insert at that point, or there is a meter, the connection shall be made to the consumer's hard metal pipework and before any branch pipework. Where practicable the connection shall be made within 600 mm of the meter outlet union or at the point of entry to the building if the meter is external.

 

[chocolate]

WHAT IF . . . the pipework enters the property at high level ( say 3rd floor flat - the meter is located at ground floor level - pipework fixed to outside wall ) but where it enters the property is not accessible due to say ceramic floor tiles everywhere, and the pipework has been branched underneath that flooring. Several pipes rise from the floor, in various locations around the flat.

WHERE would you bond to ? Would you take it to where the original pipe enters the building ( but on the outside ) - not accessible for an inspector. Or would you take the bond conductor all the way down the the meter in conduit, say ?

 

[Spudnik]

544.1.2 Where practicable the connection shall be made within 600 mm of the meter outlet union or at the point of entry to the building if the meter is external.

Doesnt say "must" though.

The regs can be translated in lots of different ways.

If it was me doing the job, i would probably take it down to the meter.

Better there than under a floor where it will not be accessible.