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Leakage from underfloor steel conduit trench

K Samoei

I recently inspected an old building whose wiring is drawn in underfloor steel conduits in a trench openable from the floors above (1st and 2nd floor)., and branching of to lighting and power points.  Despite the rust as shown here, the installation is in ‘working condition’.  However, there are two concerns. 

First, water ingress from cleaning is staining the soffit/ceiling under and it's a nuisance to users. Second, the old wiring used the steel conduit system as a CPC and rust could have reduced it's effectiveness.

I have thought of covering/encasing the trench permanently but two issues arise. How to deal with draw-off points at corners and at 10m interval; and the possibility that rewiring may be rendered impossible in the future.

I would appreciate any comment from anyone who has had to reckon with this such a challenge and how they approached it.

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    Hi Kenneth, my views just for your reference:

    For long term, I would suggest replacing the complete circuits with armoured cable if technically and financially feasible.

    For temporary or short term, if you can solve the water seepage problem and the cables inside the conduit are still in healthy status, I would consider simply laying a single core armoured cable to serve as CPC. However, being a responsible manner, the site owner should have to regularly check the situation and when the conduit is not serviceable, the site still have to perform a complete rewiring.

    Finally, if they are old final circuits without RCB protection, do consider to add it.

    WF

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    Hi Kenneth, my views just for your reference:

    For long term, I would suggest replacing the complete circuits with armoured cable if technically and financially feasible.

    For temporary or short term, if you can solve the water seepage problem and the cables inside the conduit are still in healthy status, I would consider simply laying a single core armoured cable to serve as CPC. However, being a responsible manner, the site owner should have to regularly check the situation and when the conduit is not serviceable, the site still have to perform a complete rewiring.

    Finally, if they are old final circuits without RCB protection, do consider to add it.

    WF

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