How can you Earth Bond plastic incoming mains water pipe?

[pushrod]

A plastic incoming service cannot, by definition, be an extraneous conductive part, ie. a part that is liable to introduce an earth potential or any other potential into an installation. Therefore main equipotential bonding is not required.

There is a standard test, described in GN8, to confirm whether an incoming service is or is not an extraneous conductive part. Using a high-reading ohm-meter, resistance is measured between the part and the MET of the installation. If above 56K Ohm it is not an extraneous conductive part.

Hi where do you get that value from? The figure of 22KΩ sticks in my mind but tbh i can't remember off hand where i saw that.

 

[IQ Electrical]

I use 23K Ohm, derived from a 10mA fault current.

 

[tonys]

When I spoke to one of the niceic's long standing engineer inspectors, he said you don't bond plastic water incomers, but if you want to do it, then don't bother asking me in the first instance.

He was the same person who said he does not agree with own technical team of technician's who say the existing bonding clamps attached to a lead incomer are unsuitable.

Therefore imo the niciec inspectors appear to interpret BS7671 differently from their own technical team, but they always say your the one signing the sheet. So I would do what I was happy with, no matter what I'm told by others.

And will never be told how to carry out my job by a QS or Site Agent and many other non Electrical trade person. You have a Duty of Care, that's where it Stops.

 

[ezzzekiel]

thata a good point so my view stands a main bond will be fitted at first available point (wherever that may be)

 

[tonys]

thata a good point so my view stands a main bond will be fitted at first available point (wherever that may be)

Fit the bond, your the electrician and you have a duty of care, and your name will go on the sheet in the one and only box of: designer, installer and tester.

I never do what I'm told to do if I'm not comfortable with it, end of.

Ive just gone on a job, ripping out 25mm bonding cables and running in new 50mm ones, I'm not sure there needed, but I'm not signing any sheets.

 

[malcolmsanford]

Fit the bond, your the electrician and you have a duty of care, and your name will go on the sheet in the one and only box of: designer, installer and tester.

I never do what I'm told to do if I'm not comfortable with it, end of.

Ive just gone on a job, ripping out 25mm bonding cables and running in new 50mm ones, I'm not sure there needed, but I'm not signing any sheets.

Must admit I have never seen non-copper bonding cables at 25mm^ is that a new install and they got it wrong.

 

[tonys]

Must admit I have never seen non-copper bonding cables at 25mm^ is that a new install and they got it wrong.

These are copper.

Non PME systems need not exceed 25mm, but this is a PME system and the run is a good 35/40 meters and I think they maybe referring on Table 54.8, but I'm not sure if the main supply cables exceed 150mm.

Now if the continuity ohms reading was exceeding 0.05, then that maybe a factor.

I'm already get ----ed off being told what to do, Ive already put so called technical people in a corner with a bit of BS7671 theory and its surprising how many older people out there are blagging their way through lol

 

[Sparky Ninja]

check out 544.1.2

Ok if this topic is going to go on and on, can we discuss what's wrong with the reg?

 

[tonys]

Its telling you to bond no matter

 

[malcolmsanford]

Ok if this topic is going to go on and on, can we discuss what's wrong with the reg?

These are copper.

Non PME systems need not exceed 25mm, but this is a PME system and the run is a good 35/40 meters and I think they maybe referring on Table 54.8, but I'm not sure if the main supply cables exceed 150mm.

Now if the continuity ohms reading was exceeding 0.05, then that maybe a factor.

I'm already get ----ed off being told what to do, Ive already put so called technical people in a corner with a bit of BS7671 theory and its surprising how many older people out there are blagging their way through lol

Ahh right there PME I though you may have had a engineer not exactly reading the BRB right.

 

[tonys]

Ahh right there PME I though you may have had a engineer not exactly reading the BRB right.

I think you may of been thinking what I started think, just as well I checked the book and said nothing lol

 

[Guest123]

The NIC have their own views on extraneous conductive parts.........


http://www.electriciansforums.net/e...ical-regulations/16558-extraneous-yes-no.html

 

[telectrix]

The answer to the question is soooooo ssssssimple. if it's copper bond it in the usual way. if it's plastic, I can supply an endless quantity of plastic zip ties, quick to fit and just clamp the insulation of the bonding conductor under the tie. better still, as it's plastic pipe, just use a bit of green/yellow sleeving as the bond. makes everything look kosher for the jobsworth building inspector.

 

[ezzzekiel]

as widdler states 544.1.2 as near as practicable or after any insulating section. which is the only reg that actually gives any real wording on the matter. but with a site manager, qs and unresponsive advice from niceic i think the area should be addressed a bit more clearly within the regs.

eitherway im fitting bonding at first available point wether it returns to plastic, copper or kryptonite and they can all go jump!

 

[telectrix]

as widdler states 544.1.2 as near as practicable or after any insulating section. which is the only reg that actually gives any real wording on the matter. but with a site manager, qs and unresponsive advice from niceic i think the area should be addressed a bit more clearly within the regs.

eitherway im fitting bonding at first available point wether it returns to plastic, copper or kryptonite and they can all go jump!

welll said. totally agree with you