OP
SPARTYKUS
Forums here to argue too! If we all agreed there'd be owt to discuss!
Discuss chasing into concrete screed floors - a risk to the neighbour's lights? in the UK Electrical Forum area at ElectriciansForums.net
getting to be a point this as well in here just lately Tony..Shouldn't that be nowt?
and whats this supposed to mean...?That’s you’re speciality, isn’t it?
Marty203 are you sure you are not getting mixed up with maisonettes as I could then understand if their downstairs lighting conduits came from their bedrooms above. Perhaps if you where a young lad at the time you may of only worked on those parts of a large job and not remembered or recalled the conduit arrangements for the bedroom lighting which should of been cast into the slab?
I agree. I get to see the work done by NICEIC sparks, and a lot of it is shoddy.
By the way, I work for an NICEIC firm, I do the inspection & testing, and Ive never met the NICEIC man.
im sure that for small firms, this is the case. Im sure that may outfits choose the jobs that they show their assessors.Im QS for nic firm and we have annual visit
and have to jump through hoops
im sure that for small firms, this is the case. Im sure that may outfits choose the jobs that they show their assessors.
I work for a very large M&E firm, with over 800 tradesmen on the books. I work out of a satellite office, where im one of 8 sparks. As you can tell, im not a fan of the current system of QS. Its not effective in a large firm, where nobody ever see's my work.
Question guys: this is a maisonette with 2 floors undergoing a rewire. How to wire the lights on the lower floor? Options are 1) battening and 2) chase screed above and drop through floor. Everyone seems to prefer option 1 but me! Why is it so hard, especially as we'll be chasing the screed to lay pipework for central heating?
Are there any regulations against running lighting cables in the screed above?
Hello Tony
yes, it should be "nowt", a slight erroneous transcription from brain to screen.
I may be slightly lysdexic
Seeing as you'd be running a cable installation from one installations equipotential zone into another installations equipotential zone, what do you think??
Visual Observations
• At first floor level, adjacent to the stair well is a small airing cupboard with a water tank. The floor in this area was lifted to reveal a soft grey material, which on first impression was thought to be a floor screed.
• With the aid of a chisel, the soft grey material was easily broken away to reveal a water pipe buried within it.
• The depth to the bottom of the copper pipe was approximately 30mm.
• Below was a further pipe.
• It is believed that the two pipes are the flow and return to the water tank located within the airing cupboard.
• The depth of the screed is therefore most likely approximately 50mm in depth.
• The ceiling of the ground floor reception room was also exposed in one location to reveal a smooth concrete surface, of different colouration and texture to the soft grey material observed within the airing cupboard.
Figure 1 – Exposed Screeded Slab Surface – Airing Cupboard
Conclusions/Recommendations
Based on our visual observations, it appears that the floor structure is of reinforced concrete construction. It was not possible to conclusively determine if the floor slab was of precast or in-situ construction. Based on the surface finish to the soffit area exposed, it would suggest that the floor slab is most likely of pre-cast concrete construction.
To the top surface of the concrete floor slab is quite clearly a screed of approximately 50mm in depth, which has services within it as was seen in the airing cupboard.
We understand that you wish to run further new services within the screed layer. We can confirm that this will not affect the structural performance of the concrete floor slab. However, it should be ensured that the screed is broken out carefully (not with an angle girder or similar) to ensure that the concrete surface of the floor slab is not damaged or cut into.
If this is a maisonette with 2 floors and he's wiring the lower floor lights from the upper floor how would he be running a cable installation from one installations equipotential zone into another installations equipotential zone, or am I missing something?
Not too sure what he's going to do for the upper floor lighting though?? ..lol!!
My only worry would be, that the surveyor mentions that the floor slabs are of the precast type. Making penetrations in precast concrete slabs, need to be undertaken with caution, especially if they are of the pre tensioned variety!!
Reply to chasing into concrete screed floors - a risk to the neighbour's lights? in the UK Electrical Forum area at ElectriciansForums.net
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