Sorry, poorly-worded question. What I should have asked is whether there is any reason why they should not be used in an installation to BS7671.
My feeling is that their use would fail the requirement for good workmanship and materials - sorry again, I can't temember the reg number.
My dad had, in the early fifties, a large box of the old porcelain screw-on connectors, but I haven't seen them on sale for many years. I know the Americans seem to find them acceptable, (although they blame more of their house fires on electrical causes than we do) but I was wondering if they're specifically forbidden, or just not considered good practice.
Some of the modern "screw-its" have a metal insert ( those in the link do ) and this can result in a joint between conductor and insert that is similar to a punched down IDC type of connection. So they may provide a reasonable good joint.
Personally I wouldn't use them as vibration will adversely affect the joint.
I was in Oregon recently and visited the local Home Depot along with another engineer from Europe, for amusement. We had a really good laugh over the display of wire nuts. Some of their electrical fittings were also really funny; for example a device which screwed into a light socket and had a new lamp holder, plus *two* standard mains sockets.
It is sad that economic activity should be bringing wire nuts here.
I just had a search for wire nuts and came across the follow quote describing to an american how we do it over here:
I'm in very Eastern Europe and I don't remember ever seeing wire nuts in action. The typical way to connect wires is to either twist them and wrap in insulation tape or use connectors with screws. –
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