Bonding of cast iron toilet waste??

Underpaid · Mar 23, 2015

Has anyone ever bonded a cast iron waste pipe? and if so what were the circumstances? Can u buy some kind of freaky long bonding clamp? As it states in the regs not to join two clamps together.

Marvo · Mar 23, 2015

Have you tested the pipe?

You get a perforated bonding strap that comes in long lengths.

[ElectriciansForums.net] Bonding of cast iron toilet waste??

davesparks · Mar 23, 2015

Yes I have, in the circumstances where it was an extraneous conductive part and I used earth clamps with a suitable length strap (obtained by asking for them at the wholesalers)
It doesn't state anything in the regs about joining two clamps together, but it does in the guidance notes.

Marvo · Mar 23, 2015

Hmmm, maybe scratch my idea then, it might not be suitable for the UK.

davesparks · Mar 23, 2015

Marvo said:
Hmmm, maybe scratch my idea then, it might not be suitable for the UK.

Your idea should be fine, but there is an off the shelf bs951 earth clamp that will fit

Marvo · Mar 23, 2015

Thanks Dave, I'm always a bit wary about different UK requirements. We use the strapping quite regularly, it's handy for larger pipes plus and other components and you can use the strap as the wire so no need for joints.

Knobhead · Mar 23, 2015

I've used miles of that stuff over the years.

The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.

Leesparkykent · Mar 23, 2015

AEC 5/4 £9.45| AEC 5/6 £10.50 | Niglon Long Earth Clamp | Ntech Supplies Ltd

LeeH · Mar 23, 2015

Tony said:
I've used miles of that stuff over the years.

The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.

Begs the question is it really extraneous then.

ian.settle1 · Mar 23, 2015

Tony said:
I've used miles of that stuff over the years.

The only problem with bonding a cast iron pipe is the joints. You’d stuggle to get any continuity through them.

Yep as cement is used to seal the joints

Knobhead · Mar 23, 2015

Traditional joints were tarred jute string and capped with putty. Cement cracks with any expansion/contraction.

PEG · Mar 23, 2015

ian.settle1 said:
Yep as cement is used to seal the joints

Hemp,and mortar,on older systems,as Tony said,continuity would be dubious.:icon12:

Leesparkykent · Mar 23, 2015

Why would you be worried about continuity on the sections of the cast iron waste if you have bonded the parts that have been proved as extraneous?

Knobhead · Mar 23, 2015

PEG said:
Hemp,and mortar,on older systems,as Tony said,continuity would be dubious.:icon12:

With modern ductile iron pipe would be even more dubious. Rubber seals are used.

One of the many weird things I’ve got involved with was pumping water continuously around four 8m sections of 1000mmID ductile iron pipe. I don’t know why but out of interest I checked for continuity across a joint. I can’t remember the reading but you certainly wouldn’t rely on them for any form of continuity.

As for why we were pumping water around in circles? If I was to say for the good of our health you’d think I was being sarcastic. Far from it, it was to find out the amount of solubles leached out of the cement lining. As I said, for the good of our health.

Knobhead · Mar 23, 2015

I’ve just looked in the 16[SUP]th[/SUP] OSG. Bonding a metal soil pipe in a bathroom was a requirement.

I’m going to make a wild guess being as the OP has cleared off, he’s found a bonded pipe doing an inspection and it’s not in his IET comic book.