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Have been asked to quote for a re-wire of a 3 bed property, fairly standard stuff really except that the ground floor is a solid concrete floor with copper pipework to 4 radiators, a gas hob & a further 2 gas pipes up throught the kitchen. I've IR tested pipework from the MET & it comes up 0.00 Mohms, continuity gives a reading of approx 14 ohms. Thus, all pipework is extraneous & requires main bonding as far as regs are concerned.
Bonding pipework to the hob is not a problem although it'll need to be made accessible for inspection somehow. However, I'm not really sure how I'm going to loop a 10mm cable between 4 radiators in 4 different rooms while keeping it aesthetically pleasing to the eye bearing in mind that all bonding connections need to be made accessible for inspection. The supply is currently TT but Western Power have had a look & confirmed PME is present (earth terminal present on side of service head but earthing currently provided by rod sunk into the ground within what is currently the garage but is being converted into a downstairs bedroom).
I mention this because I could keep it TT & use a smaller sized MBC which might make life a bit easier. Originally I was going to use the available PME. I've never had to deal with this issue before so it's a new one on me. Any thoughts?
Bonding pipework to the hob is not a problem although it'll need to be made accessible for inspection somehow. However, I'm not really sure how I'm going to loop a 10mm cable between 4 radiators in 4 different rooms while keeping it aesthetically pleasing to the eye bearing in mind that all bonding connections need to be made accessible for inspection. The supply is currently TT but Western Power have had a look & confirmed PME is present (earth terminal present on side of service head but earthing currently provided by rod sunk into the ground within what is currently the garage but is being converted into a downstairs bedroom).
I mention this because I could keep it TT & use a smaller sized MBC which might make life a bit easier. Originally I was going to use the available PME. I've never had to deal with this issue before so it's a new one on me. Any thoughts?