Somebody help me please

[cliffed]

Been in this trade for nearly 50 years,with all the tech guides,the regs,videos etc,still can’t get my head around this new reg,concerning main bonding conductors.
If the metal pipes have a plastic insert @ the entry to the building,there is no need to bond.This includes all metal pipe work on that same pipework,internally,is that correct.

 

[cliffed]

If you don't bond the water pipe because it has a plastic sleeve then what happens if a live conductor touches the pipe? Does this not make the pipework alive waiting for someone to touch it?
I know the bonding wire was there for equipotential purposes but surly it also helps with fault protection? Especially if there is no rcd protection.
I will still be bonding ALL gas and water pipes regardless as I think this is a stupid change.

Exactly it seems no one knows the right or wrong on this one.Being an old schooler,I will bond whatever.

 

[ipf]

Exactly it seems no one knows the right or wrong on this one.Being an old schooler,I will bond whatever.

Bond...…..as long as it's shaken not stirred

 

[Wilko]

Been in this trade for nearly 50 years,with all the tech guides,the regs,videos etc,still can’t get my head around this new reg,concerning main bonding conductors.
If the metal pipes have a plastic insert @ the entry to the building,there is no need to bond.This includes all metal pipe work on that same pipework,internally,is that correct.

Hi - from OSG page 50 -
“Where there is a plastic incoming service and a metal installation within the premises, main bonding is recommended unless it has been confirmed it’s not introducing Earth potential.” (slightly abbreviated)
I’m probably going to continue to bond a house full of copper pipes in case a plumber changes something in the next 20 years.

 

[telectrix]

but then you are introducing an earth potential where the wasn't one before, so could be more of a danger if as person is in contact with a live part and the pipe you've just fixed at a 0V.

 

[Midwest]

Where would that stop, RSJ's....metal window frames? It's back to the Cockburn school of thought.

Calm down, was only thinking out loud.

 

[Midwest]

For not clipping cables to joists?

Interested on how you do that on a rewire, very, very small apprentice.

 

[telectrix]

Calm down, was only thinking out loud.

i know i could hear the brain creaking from here..

 

[Midwest]

i know i could hear the brain creaking from here..

I was thinking of giving you a dumb, perhaps bad spelling (grammar really), or even just a plain 'old' (see what I did there) dislike.

But its BH tomorrow, peace on Earth and good will to all men etc

Any constructive ideas on my switch cover?

 

[Wilko]

but then you are introducing an earth potential where the wasn't one before, so could be more of a danger if as person is in contact with a live part and the pipe you've just fixed at a 0V.

Agreed.
But wouldn’t this be the same risk in every house that has water bonded to MET? Or have I misunderstood?

 

[cliffed]

The new generation of sparks,will not bond now,cause that’s what they have been told to do.
Like someone said,we bonded everything in days gone by

 

[telectrix]

I was thinking of giving you a dumb, perhaps bad spelling (grammar really), or even just a plain 'old' (see what I did there) dislike.

But its BH tomorrow, peace on Earth and good will to all men etc

Any constructive ideas on my switch cover?

does that exclude women and gender neutrals, or are they covered by etc?

 

[Bob Geldoff1234]

As I see it there are two reasons to bond pipes.One is equipotential(where all the bonded parts have the same voltage flowing through them as the fault current rises to the point of the breaker tripping) or fault protection (where the pipes potentially become live but the presence of the earth wire causes the breaker to trip)

The risk of someone touching two metal surfaces while the voltage rises to a point of tripping (usually 0.4 seconds) is surely un-heard of.
So much better to bond and guarantee the breaker or rcd will trip compared to the pipes becoming live waiting for someone to touch them.
People on here have pointed out that the boiler should be earthed.
0.75mm green yellow is hardly fool proof protection in my opinion.Much better to have a 10mm bonding cable as back up if the boiler wire gets disconnected.

 

[telectrix]

So much better to bond and guarantee the breaker or rcd will trip

but the breaker will trip as long as the (earthed) exposed metal part that has the fault, regardless of any bonding.

 

[static zap]

The new generation of sparks,will not bond now,cause that’s what they have been told to do.
Like someone said,we bonded everything in days gone by

Who are we protecting ,customers , or DNO from lightening strikes getting coupled too well back into supply !
(what next fancy quenching fuses in neutrals )

 

[ElectricSeamus]

I'm currently having a complete central heating system installed along with a rewire. Pipe work will be all plastic with the exception of the radiator tails and the first metre from the boiler as per manufacturers instructions. Incoming water main is plastic and will be joined to new plastic supply to bathroom and kitchen. I don't have a lot to bond but would be interested to know what the electricians take in this will be.. I'm guessing it will be just bond the gas!