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My conclusion from all the help given today, further reading and a hard thing is that, The 16mm T&E cable with 6mm CPC sub-main to each of office boards is in fact an extension of the main earth conductor from the DNO's supply to the MET of each DB and not just a CPC and hence table 54.8 has...

This is were I'm feeling uncomfortable about the current installation. the suites are supplied from individual DNO supplies, I've found five so fare. it dose not have a common supply at all.  It has a landlords supplie for the services of communal outside lighting, etc. This did have a 10mm...

Thank you for making me feel even more terrified of this job, that's exactly what I think I'm looking at here, a complete mess that should be addressed as a hole building. my understanding is that a submain that would then require Main equipotential bonding to its supply DB MET would need to...

Should the gas boiler pipework (Gas Pipe) be main bonded to the MET of the office DB, as it is in that offices kitchen area?? I can totally see the sense of what you have said about the cable if it was being used to supply a final circuit for example, but as a sub-main to a DB MET?? is that...

Please excuse my hilarious spelling, that was Query not Quarry but sometimes I do feel like digging a hole.

Please could I have some opinions of a job I am looking at. This is a commercial property, with multiple office suits on a 1st floor supplied by individual mains supplies from the DNO. individual meter cupboards at the back of the building supply each office. One of the office suit supplies...