I have just had a utility room built. When finished (!), it will have a sink fitted, same as a kitchen type. My question is: do the hot & cold pipes under the new sink require earthing or not? They are simply extensions of the H & C pipes that supply the kitchen, and both those are earthed with a link back to the consumer unit. As the pipes are earthed already, I am unsure as to whether they need additiobnal clamps on or not? Any advise would be helpful. Also, am I correct in thinking that you no longer need to add an earth to a metal sink itself? I was trained on the 15th Edition, and we had to back then!! Thanks.