bonding of main water plastic incoming

[D Skelton]

Just remove the main earthing conductor from the MET as if you were measuring Ze and test between that (the earth) and the pipe. No parallell paths then.

 

[44ALLAN]

Of course not, but SBSB said if the incomer is plastic then the PLUMBING isn't an extraneous conductive part. I would test the metal pipework nearest to the connection to the plastic incomer and if extraneous; bond.

Sorry mate that wasn't directed at you lol

 

[D Skelton]

Oops, sorry lol

 

[44ALLAN]

Oops, sorry lol.

Haha............I was responding post 23 and the gem of a post 26 mate.
Megaflows and ADS etc.
Seems you don't need to Bond incoming services anymore as the neighbours will do it for you :shocked:

Obviously a windup................I hope !

 

[Deleted member 9648]

Just remove the main earthing conductor from the MET as if you were measuring Ze and test between that (the earth) and the pipe. No parallell paths then.

Yes there are. You are likely to get parallel paths from other extraneous services such as gas/oil which are mechanically connected to the same system as the water via boilers etc and not practical to remove.Disconnecting main earths and bonds still does not eliminate misleading readings.

 

[D Skelton]

That's assuming other services have been bonded, which if they have and it is affecting the water then bonding it anyway isn't going to do any harm. If the bonds are affecting the water so much that you get a 0.05 - 0.06 reading then some would argue that it would be safe to assume a bond is already in place and to leave it and crack on.

 

[kevyn]

A local firm in my area have just had the nic crawling all over them because they didn't run a main bond to the water main. Incoming pipe was plastic covered copper, rest of houses in plastic (scheme).
I would still run a bond and connect it on to the stop valve, this would satisfy the sheets, regs, and any electrician who looks at it.

 

[drew35]

If in doubt bond that Mo Fo.

If told to do it by the foreman do it and when questioned say that Mo Fo told me to do it!

 

[Spoon]

If told to do it by the foreman do it and when questioned say that Mo Fo told me to do it!

Do you do everything a foreman tells you to do???

 

[Deleted member 9648]

That's assuming other services have been bonded, which if they have and it is affecting the water then bonding it anyway isn't going to do any harm. If the bonds are affecting the water so much that you get a 0.05 - 0.06 reading then some would argue that it would be safe to assume a bond is already in place and to leave it and crack on.

You miss the point mate,existing bonding has nothing to do with it. If a gas pipe (for example) is extraneous,it will be at earth potential or thereabouts whether it is bonded or not.There is likely to be some electrical continuity to the water system via mechanical connection between pipework at a boiler even with all bonds/earth disconnected. Thats why the IR test to establish whether bonding is required is nearly always misleading.....(IMO!)

 

[D Skelton]

You miss the point mate,existing bonding has nothing to do with it. If a gas pipe (for example) is extraneous,it will be at earth potential or thereabouts whether it is bonded or not.There is likely to be some electrical continuity to the water system via mechanical connection between pipework at a boiler even with all bonds/earth disconnected. Thats why the IR test to establish whether bonding is required is nearly always misleading.....(IMO!)

No, I'm not missing the point, instead I am agreeing lol.

Misleading readings possible but no harm done if bonded anyway

 

[Deleted member 9648]

A local firm in my area have just had the nic crawling all over them because they didn't run a main bond to the water main. Incoming pipe was plastic covered copper, rest of houses in plastic (scheme).
I would still run a bond and connect it on to the stop valve, this would satisfy the sheets, regs, and any electrician who looks at it.

If the incomer is copper it's almost certainly extraneous and needs bonding regardless of the rest of the install being plastic.

 

[KAS1]

The more I read these threads regarding bonding, I can fully understand why, when the 15th was around nearly everything was bonded (within reason, may I add, some people went way over the top) if in doubt bond, a few tenby earth clamps and a bit 10mm doesn't cost at lot in the average house. Seems now people are just getting more and more confused and doubtful as to bond or not to bond. lol

 

[Deleted member 9648]

The more I read these threads regarding bonding, I can fully understand why, when the 15th was around nearly everything was bonded (within reason, may I add, some people went way over the top) if in doubt bond, a few tenby earth clamps and a bit 10mm doesn't cost at lot in the average house. Seems now people are just getting more and more confused and doubtful as to bond or not to bond. lol

Agree.
99% of the confusion results from a failure to understand the meaning of the terms 'extraneous conductive parts' and 'conductive parts' and that bondings only function is to prevent the possibility of a PD between the two. It doesnt help that bonding is always discussed/described in conjunction with the term 'earthing' when the purposes of bonding and earthing are entirely separate. It's a simple concept,and it never ceases to amaze me how many electricians still dont get it.

 

[Thefailsafe2012]

As this is new emerging technology and there is no common person know to it. But after it has happen, the conditions could be so different. Yet there is a little success but not enough to experiment publicaly.

Touche sir, a good point well put for the discussion at hand.....