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Is concealed flexible conduit permitted in plaster board walls for example ? I understood conduit had to be rigid for fixed wiring and flexible conduit only permitted for final connections to vibrating or moving equipment ?

James Lawson

Perhaps I am old school but am surprised to be asked to permit flexible conduit instead of traditional rigid conduit for concealed fixed wiring with the condition that it is securely clipped horizontally or vertically in the zones  prescribed by BS7671

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    I know of nothing in BS 7671 that says that flexible conduit can only be used for final connections (a long time ago there was a rule that flexible cables could only be used that sort of way, but AFAIK it didn't apply to conduit itself, and has long since gone anyway).

    There are some limitations though - e.g. flexible metal conduit can't be relied upon as a c.p.c. - so you couldn't for instance use concealed flexible metal conduit for protection against penetration by nails/screws etc under option (ii) of 522.6.204 for example - but that need not stop you using flexible conduit for a bit of extra protection or convenience of future re-wiring if you've satisfied 522.6 in some other way (e.g. runs in zones + 30mA RCD).

    In some places (e.g.. France), singles in flexible plastic conduit, embedded in walls etc is the perfectly normal way of doing things in domestics - much simpler to install & draw into than rigid when you have lots of structural obstructions to work around, and makes future modifications a lot cleaner & simpler.

      - Andy.

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    I know of nothing in BS 7671 that says that flexible conduit can only be used for final connections (a long time ago there was a rule that flexible cables could only be used that sort of way, but AFAIK it didn't apply to conduit itself, and has long since gone anyway).

    There are some limitations though - e.g. flexible metal conduit can't be relied upon as a c.p.c. - so you couldn't for instance use concealed flexible metal conduit for protection against penetration by nails/screws etc under option (ii) of 522.6.204 for example - but that need not stop you using flexible conduit for a bit of extra protection or convenience of future re-wiring if you've satisfied 522.6 in some other way (e.g. runs in zones + 30mA RCD).

    In some places (e.g.. France), singles in flexible plastic conduit, embedded in walls etc is the perfectly normal way of doing things in domestics - much simpler to install & draw into than rigid when you have lots of structural obstructions to work around, and makes future modifications a lot cleaner & simpler.

      - Andy.

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