Heya John!
[quote author=JohnD link=1109114051/0#0 date=1109114051]Am I right in saying that there are different types of earth clamps [/quote]
Yes, there are Interiour and exteriour clamps
Quote:and that I need an external one to bond direct to my Gas supply - the meter is in one of those horrible external plastic boxes
No, you may bond it where it enter's inside the house
Quote:Also, all the cables are routed to the CU (which is under the stairs) from beneath the floorboards; they then run behind the skirting board up behind the Company Fuseboard
There is however a 4 1/2 inch gap between fuseboard and skirting where they are visible - all eight of them, side by side.
Should I sheath them, and if so in what, or just clip them to the wall? Currently they are loose. The old ones (now removed) were held to the wall by many layers of gloss paint, but I don't want to do that...........
With regard to you're Twin sheathed cables, wasn’t sure that it complied to run behind the skirting, but leaving that aside, where the cables run up exposed, the normal thing would be to have them in some plastic Trunking of some description, otherwise they run the risk of being damaged..
Holding cables to the wall with gloss paint is a no no, alternatively to using Trunking you can clip the cable's, but again this means there not mechanically protected
Sheathing cables that are already sheathed (I hope) is not normal practice
Hope this helps