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Metal Conduit Concealed in Walls

Stuart Urban

Regulation 522.6.204 (b) allows us to use metal conduit to protect cables concealed in walls provided that the conduit satisfies the requirements of the regulations for a protective conductor. Regulation 543.3.2 requires every connection and joint be available for inspection except as provided by the exceptions given by 526.3.

Does this preclude the use of metal conduit if there are threaded joints? What about the new type of unthreaded conduit that uses grub screws to fix the tube? (e.g. Conlok).

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  • This is one of those interpretation questions.

    What type of wall are we considering? I would not bury galvanised conduit in a plaster wall, but would not object to it in a studding wall (or in a floor/ceiling void).

    Neither "connection" nor "joint" is defined in Part 2.

    Joints under the floorboards (be they galvanised conduit, in a Wago box, or an old-fashioned terminal box) may be inspected with a certain amount of bother.

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  • This is one of those interpretation questions.

    What type of wall are we considering? I would not bury galvanised conduit in a plaster wall, but would not object to it in a studding wall (or in a floor/ceiling void).

    Neither "connection" nor "joint" is defined in Part 2.

    Joints under the floorboards (be they galvanised conduit, in a Wago box, or an old-fashioned terminal box) may be inspected with a certain amount of bother.

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