) and fancy the whole, 'loaded', plastic CU, then this has just fallen into my inbox ...
Very probably. As we know, many/most electricians appear to have interpreted the regs as meaning that they now must always use metal CUs. Indeed, it wouldn't surprise me if a good few haven't even realised that plastic ones are still as compliant as they ever were in non-domestic applications.
Probably, at least to some extent. However fabricating a metal one inevitably involves several manufacturing steps, whereas a plastic one just pops out of a machine (probably an injection moulding one) more-or-less 'ready to go' - so it's probably always going to be more expensive.
Anywhere non-residential. From my observation, an awful lot of small shops, 'take-aways', small offices etc. etc. use exactly the same single-phase CUs that one uses in domestic properties - an they can still be plastic.
hows it affected if the shop has living accomadation, with the same supply, would it be that if its metered seperate then the shop may have plastic but the accomadation metal and if all on one meter then all must be metal,
As we've often discussed, it's impossible to know. Literally "Non-combustible" is impossible, yet they have not defined what they are using the term to mean, other than to give ferrous metal as an example of a material which complies. I presume that is why 'everyone' is now manufacturing and using steel ones. The same people would probably be 'unhappy' about using, say, aluminium or brass ones.
I think your about 60 years out there. I was installing Wylex boards with a wooden 'frame' into the 90's.
I think Owain is referring to wooden patresses in switches and sockets, I wasn't aware the Wylex standard with wooden backs were available that recently, I thought they changed to the newer design years before that
I'm not sure when the change occurred, but I've certainly removed some (with wooden 'sides', not back - the back either being absent or a sheet of paxolin) which has been installed in the 60s and early (if not also late) 70s.
If you mean a wooden back, then the same here. However, said, the ones I saw commonly had a thin sheet of paxolin (or somesuch) at the back, held in place by the main fixing screws.
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