main bonds.

[jl-heating]

whats your opinion on 1 x 10 mm unbroken to both gas and water.

i am of the opinion that 2 are req but sometimes its just plain silly to go the same route with 2 ?

 

[D Brennan]

whats your opinion on 1 x 10 mm unbroken to both gas and water.i am of the opinion that 2 are req but sometimes its just plain silly to go the same route with 2 ?

1 is fine

 

[Riggy]

So long as it's unbroken, it's OK for me - assuming it's found in a PIR, on a new job run two out of habit.

 

[jl-heating]

thought so cheers guys,

its just we seem to getting more and more earth bond upgrades coming in and many are to be run external due to wooden floors etc or surface on skirtings and look pants clipped along side each other.

 

[wozz]

just out of interest, are people still bonding oil lines to external oil boilers?

 

[jl-heating]

not my field but i would advise it .

 

[NozSpark]

just out of interest, are people still bonding oil lines to external oil boilers?

Why would you bond to something that is outside of the equipotential zone????

OK bond the flow and return, but not the oil

:coat

 

[jl-heating]

mmmm point taken .

mind changed. !! no bond req .

 

[wozz]

bonding of lightening conductors is required.

what if the oil line branched off into the house for a aga? then you have to bond.

now what if you had TNCS. and a metal oil tank?

this may seem far fetched but around here i see it now and again.

 

[green-hornet]

just out of interest, are people still bonding oil lines to external oil boilers?

Yes, you must treat any external supply like you would with the normal gas and water.

This is why on the test certificates there are extra boxes to fill in such details.

You are not creating any extreme potential, you are keeping all potentials at the same level of fault.

With regards to the original post

Ideal world would require a 10mm to Water and a 10mm to gas.

However as most gas and water installs are close together 1 unbroken 10mm would be ok and is allowed under the regulations.

The practice of installing 100mm of copper pipe to bond to on the water supplies will soon be phased out.

Plastic does not require bonding.

 

[green-hornet]

bonding of lightening conductors is required.what if the oil line branched off into the house for a aga? then you have to bond.

now what if you had TNCS. and a metal oil tank?

this may seem far fetched but around here i see it now and again.

I have seen this type of installation with a connected earth rod.

ie the earth rod earthing was connected to the pme earthing giving multiple earthing.

 

[binky]

On recent TT installation used Main earth as bond for gas as well all in 10mm - as long as there are no breaks in cable there is nothing wrong with this practice.

 

[jl-heating]

looks like unbroken is ok then cheers lads ..

 

[batty]

On recent TT installation used Main earth as bond for gas as well all in 10mm - as long as there are no breaks in cable there is nothing wrong with this practice.

I would not do that because you cannot test Ze .

Batty

 

[Riggy]

I would not do that because you cannot test Ze .Batty

Yes you can, just need to discoonect at the right point, i.e. leaving earth rod connected but not bonds. Not as simple as if they all go back to MET I agree, but to say "you cannot" is wrong.

 

[batty]

Yes you can, just need to discoonect at the right point, i.e. leaving earth rod connected but not bonds. Not as simple as if they all go back to MET I agree, but to say "you cannot" is wrong.

Also in my area edf insist on 16mm main earth so 10mm does not comply.

Batty

 

[rainydays]

Do not know if this is right as i have not seen it anywhere, but i have been told that if you are using one for both then they must be un-broken and you have to go to the water before the gas. Was not given a valid reason for this.

 

[binky]

you have to go to the water before the gas. Was not given a valid reason for this.

That's because there isn't a valid reason.

 

[a1]

There is absolutely no problem in running the Main Equipotential Bonding in One continuous run.

It makes not a jot of difference whether you go to the Water or Gas point first.

And - the NICEIC frown upon the "Pigtail" effect that we are used to doing.

They claim it causes stress on the cable.

 

[jl-heating]

next question,

6mm main bonds when did this comply and when was it a req to upgrade to 10mm.

adding an alteration to a circuit ie: boiler to an existing ring when would you need to upgrade the main bonds to 10mm.