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.
