Earthing water supply

[roukel01]

OK, went to do a PIR today, newish house, wired to 16th edition. Checked Gas bond, OK, checked water bond, not present. Upon further inspection, the only metal pipework is where the stop tap is and the plubing for the kitchen sink, from there its plastic through the house apart from in the airing cupboard (metal pipework but plastic to all rads) and a bit of metal pipework in the Bathroom.

What coding should I give, Personally if I had wired it, I'd put a main bond to the water stop tap, then supplimentary bonding at the boiler and airing cupboard because of all the plastic everywhere.

I'm thinking of giving it a code 2, but what remidial work would you recommend to put it right?

Cheers all.

 

[bramboy]

OK, went to do a PIR today, newish house, wired to 16th edition. Checked Gas bond, OK, checked water bond, not present. Upon further inspection, the only metal pipework is where the stop tap is and the plubing for the kitchen sink, from there its plastic through the house apart from in the airing cupboard (metal pipework but plastic to all rads) and a bit of metal pipework in the Bathroom.

What coding should I give, Personally if I had wired it, I'd put a main bond to the water stop tap, then supplimentary bonding at the boiler and airing cupboard because of all the plastic everywhere.

I'm thinking of giving it a code 2, but what remidial work would you recommend to put it right?

Cheers all.

Insulation resistance test required between earth and pipes 23000 ohms or above no protective bonding required.
So I would say no at stop tap. Check cylinder cupbard but prob a no.

 

[roukel01]

Insulation resistance test required between earth and pipes 23000 ohms or above no protective bonding required.
So I would say no at stop tap. Check cylinder cupbard but prob a no.

cheers, never heard of that one before!

 

[lamb]

If the incoming water service is not an extraneous conductive part (liable to introduce earth potential) then no main bond is required. A plastic service pipe cannot introduce earth potential.

This is not about 'earthing the water supply'. It is about bonding any metallic services to make a faradays cage (equipotential zone) within the general installation.

 

[roukel01]

If the incoming water service is not an extraneous conductive part (liable to introduce earth potential) then no main bond is required. A plastic service pipe cannot introduce earth potential.

This is not about 'earthing the water supply'. It is about bonding any metallic services to make a faradays cage (equipotential zone) within the general installation.

Checked with onsite guide,

"where the incoming service is plastic, but a metal installation exists within the premises, main bonding must be carried out"

 

[Notsosmart]

Code 2 by all means (you could quote 411.3.1.2) especially if it is metal coming into the house, but if it is all plastic apart from sink & heating pipes then the greatest risk will be from the pump & boiler casing etc.
As this is a 16th edition installation I bet the heating isn't covered by an RCD so it would be prudent to supplementary bond (& wired back to the board).
If the cost isn't prohibitive then I would also advise a main bond at the stopcock to cover future modifications to the pipework (especially if a waste disposal is likely to be fitted.)