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Posted By Topic: equipotential bonding methods - plumbing

Shanehane
Aug 04 2019 12:02

Hi all. We're upgrading our home wiring and switchboard with a good friend who is a registered electrician - but he typically does new industrial application and maintenance.

Our old plumbing requires compliant equipotential bonding per 5.6.2.2 (currently has un-sheathed cable wrapped around piping)

We're wondering what the standard means of attaching the earth cable to the piping is. Is there a standard item (clamp?) that meets the intent of the code?
   

SaintAlan
Aug 04 2019 12:10

Old-style plumbers often brazed a copper tab on the copper pipe, to bolt on a cable lug. There are also several types of clamps that can be used, a common one is the same clamp used for earth-rods. Available from any electrical supplier and some hardware store like Bunnings.
   

Shanehane
Aug 04 2019 12:57

Thanks SaintAlan

Did consider the stake clamps for the 15mm piping, but have 20mm copper 25mm galv and 30-40mm copper drains under the house.

So am I correct assuming there's no specific product available that the code requires you to use, and that it's a matter of meeting the intent?

Considering getting these:
https://nz.rs-online.com/mobile/p/earthing-straps/3902448/

   

dlink
Aug 04 2019 13:54

yes, those are perfect and allow for a wide range of pipe sizes.
   

ppaw1965
Aug 04 2019 14:06

There’s also the old utilux clamp. 803A. I think Erico still sell them. Not sure who else may.
   

DougP
Aug 04 2019 17:31

You should probably employ an electrician experienced in domestic work. It sounds like you as a non-electrician are reading the clause and trying to interpret the requirements?

There's a good chance most of the pipework does not need to be bonded. And even if it did, it would be very unusual to require more than one bonding point.

   

evanh
Aug 04 2019 20:43

The mechanics applies to any paralleled wires. I highlighted where twists are used intentionally is all. It was partly an explanation of why it will create an increase in inductance rather than a decrease.

   

evanh
Aug 04 2019 20:44

Doh! That posted in the wrong topic! :(
   

TheDon
Aug 05 2019 17:46

Try this stuff, been around for years , transnet still sell it
has 3/16 holes in it just chose the hole that works best for the size pipe you have and use a 3/16 brass nut and bolt in it
Quick and easy

https://www.transnet.co.nz/shop/Earthing/Earth+Rods+%26+Accessories/Earth+Strap.html