I don't think you should be worried about what the incoming supply pipe material is, what counts is the water pipes IN the property. If it's all copper from the buildings stop cock then it obviously needs bonding, if it's all plastic then not.
Exactly Malc. I'll be bonding all the saucepans in the kitchen and knives and forks in the draws on that basis (and the biscuit tin!).Why Tonkatoy does the metallic side of the installation need bonding? What if none of that metal work is an extraneous conductive part?
To carry your argument on then any metalwork within an installation must be bonded, because it is metal
Exactly Malc. I'll be bonding all the saucepans in the kitchen and knives and forks in the draws on that basis (and the biscuit tin!).
Great explanation, very clear and concise. Thanks. I would think that you are applying this to new build where you know that everything else installed is perfect and up to your own high standards.
Now, I mostly do small works in existing properties. If I'm reading your post correctly, you would not insist on main earth bonding being present at a house with a plastic incoming pipework with an IR value to earth of over 22Kohm if you were say, changing the CU.
What if the dodgy chock block connection under the floor then melted against pipework?
Surely it's better to bond anyway?
Reply to the thread, titled "bonding question" which is posted in Electrical Wiring, Theories and Regulations on Electricians Forums.