18th Edition Bonding requirements

[Ian1981]

Hi - how can this be?
To your point earlier - shouldn't the boiler itself be earthed and gas pipework after the meter is copper ... (?)

Remove the parallel paths

 

[Wilko]

Dohh - should've seen that one coming .

 

[johnduffell]

Remove the parallel paths

Picking hairs now but you can't remove them all without disconnecting the downstream connection of the water/gas
How about if the boiler is in, and the gas is extraneous but not the water, you wouldn't be able to tell which without breaking into the pipe work.
Same goes if neither are but there's something else extraneous that you don't know about that's connected to the internal pipework elsewhere.

 

[Ian1981]

Water is plastic
There’s nothing else extraneous having worked and still do in new builds

 

[Flanders]

Hi - how can this be?
To your point earlier - shouldn't the boiler itself be earthed and gas pipework after the meter is copper ... (?)

If you disconect the main earth cable from the CU the MET and do the test from MET to the gas pipe and it is not extraneous then you would get a high Meg ohm reading

Edit Ian beat me to it

 

[johnduffell]

Water is plastic
There’s nothing else extraneous having worked and still do in new builds

Yeah sorry i meant in general, if it's a new build you know what you're getting!

 

[Silly Sausage]

Had a nosey round a house once, plastic water pipe hanging in a big arc from cellar ceiling joists, with a brass stock cock half way along, with a nice juicy 10mm G/Y cable clamped to it, also hanging in a big arc, back to the CU.

Clueless!

 

[johnduffell]

If you disconect the main earth cable from the CU the MET and do the test from MET to the gas pipe and it is not extraneous then you would get a high Meg ohm reading

You'd also need to remove any bonding from the met otherwise you'd likely get a path between the water bond and the gas pipe

 

[Flanders]

You'd also need to remove any bonding from the met otherwise you'd likely get a path between the water bond and the gas pipe

Yes your correct . Sorry did not explain fully as in most casees the bonding is connected at the CU not the MET so would of been disconnected in my scenario

 

[Pete999]

Had a nosey round a house once, plastic water pipe hanging in a big arc from cellar ceiling joists, with a brass stock cock half way along, with a nice juicy 10mm G/Y cable clamped to it, also hanging in a big arc, back to the CU.

Clueless!

Makes a mockery of SOME of the SCHEME firms doing new builds doesn't it Archy? sometimes wonder why bother, doing an Apprenticeship, so who is to blame? Certsure? needs sorting PDQ

 

[Ian1981]

Makes a mockery of SOME of the SCHEME firms doing new builds doesn't it Archy? sometimes wonder why bother, doing an Apprenticeship, so who is to blame? Certsure? needs sorting PDQ

I find it’s a lack of supervision/understanding as when we are younger we tend not to care as much.
That is what the QS position should be about, to supervise and instruct, tho it’s often abused.

 

[Pete999]

I find it’s a lack of supervision/understanding as when we are younger we tend not to care as much.
That is what the QS position should be about, to supervise and instruct, tho it’s often abused.

Dissagree with you on this one Ian, yes the inspector should have picked it up, but the Bloke that did the install, was /is at fault, no excuses for this cock up Sparky doing it needs educating with his P45. And I use the words Sparky with trepidation, more than likely been working with someone for a few weeks, knows it all, bond the water pipe jobs a good un, seen it many times. No offence meant in my disagreement.

 

[Ian1981]

Dissagree Ian no excuses for this cock up Sparky doing it needs educating with his cards.

Not like you to dismiss anyone’s opinions is it?

 

[Pete999]

Not like you to dismiss anyone’s opinions is it?

I'm not dismissing the opinion Ian, just disagreeing with it, your opinion is a valid one, but the faults lies not initially with the QS but with the "Electrician?" in the first instance, but in hindsight the QS should have picked it up, if he ever checked the bonding that is, I have a Friend who was a QS, and he assures me time for detailed inspections are governed by Bosses/Managers, with no interest in quality, more concerned with quantity, please don't take my response so lightly, it's a sticky issues with new builds and unskilled operatives, you must know how it works!

 

[westward10]

Sounds like the old broken record is on again.