I need to rewire some old wooden stables. Is it acceptable practice to
mount sockets and lights directly onto wood (ie combustible surfaces)? If
not, what material should I use to mount them on?
All modern surface-mount fixtures, whether plastic or metalclad,
themselves form the required non-combistible enclosure; so mounting on
wood is OK. For a use of an old stable as workshop/living space, that's
about it: if workshop in non-managment-consultant sense, metalclad
fittings and cables/singles run in plastic conduit probably makes more
sense than surface-run ordinary PVC T&E (unless you can arrange the T&E
to run in places it's unlikely to get knocked).
If there's livestock involved, you need to pay extra attention to
reducing touch voltages in the event of fault - in practice this means
supplementary bonding, shorter runs of "normal" cable or extra CPCs
running in parallel, RCDs, and the like: combination of hosses allegedly
being more sensitive to shock, not wearing socks + plastic-soled shoes,
and standing on floors with a relatively low earth resistance all
conspire to make this (a) sensible and (b) Required.
HTH - Stefek
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