Hi there, I work as caretaker for a small college and am seeking advice about a supply cable to a new electric boiler. We need to run a 200A supply through the building which could go one of two ways. Between the ground floor ceiling and 1st floor would mean a lot of hassle and 10 extra metres but running it boxed in at ground level would be simpler and cheaper- only problem is that it needs to pass a corridor. I could channel through the concrete slab but would like to know if there is a reg to cover the minimum depth in an internal setting with foot traffic. Obviously the cable would be armoured, in conduit and a fresh concrete pour would be placed on top. I would be carrying out the running of the cable with the boiler installation people making the relevent connections and signing the work off. They are happy with a lay-man doing the donkey work but as we are fairly isolated, no one will be on site until the work is to begin, by which time any major problem would be critical. I would appreciate any advice, especially reference to the appropriate documentation which may cover this scenario.
aromoured cable depth
- Thread starter bagendben
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Who has designed the circuit (ie sized the cable). Surely they will tell you where the cable is to be ran. Someone will have to sign a completion cert. so should want to see the cable before it is hidden away forever.
450mm seems to be the norm for outside subject to the likelyhood of major excavations. Under a concrete floor will still need to be at a reasonable depth due to slim chances of floor being dug up again.
As said above best to ask the designer because he will have seen the site conditions.
450mm seems to be the norm for outside subject to the likelyhood of major excavations. Under a concrete floor will still need to be at a reasonable depth due to slim chances of floor being dug up again.
As said above best to ask the designer because he will have seen the site conditions.
is it not possible to cut a trench and just lid it afterwards - say with a piece of chequerplate screwed down?
Allows for future additions using the same void, clear indication of where the cable lays and when the lid is screwed down, relatively tamper proof.
Assuming the corridor is only a couple of metres wide, not much cost in materials.
Allows for future additions using the same void, clear indication of where the cable lays and when the lid is screwed down, relatively tamper proof.
Assuming the corridor is only a couple of metres wide, not much cost in materials.
Thanks for the trench/lid suggestion. this seems like the best solution providing it doesn't contravene any regulations. Would there still need to be a minimum depth, or is it more about plate thickness of cover?
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You will need to consider whether the trench method would affect the structural strength of the concrete floor.
Cutting even a small trench in a concrete floor can create a weak point leading the the concrete cracking under stress. Compare to cutting glass where a small score mark enables the glass to be broken more easily.
Cutting even a small trench in a concrete floor can create a weak point leading the the concrete cracking under stress. Compare to cutting glass where a small score mark enables the glass to be broken more easily.
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