Safe zone overlap - is it considered safe to route an additional spur (off existing ring socket) horizontally to the corner of the wall (ie. within the safe zone for said socket), then chop the cable around the inside corner and into a socket less than 150mm from said corner - ie. through two different safe zones - it seems to me like it will be obvious enough to anyone in future where the wiring runs (provided they are bright enough to take the cover off the sockets and have a look see where the ring is!) - plus the buried cable will be in the safe zone for the new socket upto the corner anyway.... - I'm guessing that the real question is - is it ok to bury a cable around a corner!
I assume that the 150mm is to the edge of the new socket anyway, as after this point it ceases to be a buried cable without protection (provided by the edge of the box)?
Double socket earthing - what is the purpose of having the two earth terminals? Is it because of a requirement to have an earth per outlet? Or is it intended that one earth from each side of the ring be terminated into each - therefore ensuring that the earth remains connected to the socket if one wire comes out? Am I worrying unnecessarily about this one? Just want to make it as safe as physically possible, whilst complying with the requirement to have all provided earth terminals connected.
I assume that the 150mm is to the edge of the new socket anyway, as after this point it ceases to be a buried cable without protection (provided by the edge of the box)?
Double socket earthing - what is the purpose of having the two earth terminals? Is it because of a requirement to have an earth per outlet? Or is it intended that one earth from each side of the ring be terminated into each - therefore ensuring that the earth remains connected to the socket if one wire comes out? Am I worrying unnecessarily about this one? Just want to make it as safe as physically possible, whilst complying with the requirement to have all provided earth terminals connected.