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SWA in U/F floor slab

whjohnson
Got a job where a new submain - approx 25 metre run in 16mm 3 core SWA. Embedded directly into a new concrete floor where wet U/F heating will be installed. Am trying to work out the best order of installation - that is, should the cable go in first, then the insulation, followed by the U/F pipework,and finally followed by the slab. Am not sure what order the u/f heating side will be installed and am also thinking about how if any correction factors may need to be applied for the current carrying capacity. I have sized the cable with a little overhead in mind in terms of actual final demand, but am still a little concerned about final slab operating temperature

Comments welcome.

PS - Am not liking this new format - it is like writing inside a letterbox when compiling posts!
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  • 0
    Andy,

    When you say 40', is that the actual temp of the slab? Am assuming 'C rather than 'F! The new area will be heated from the existing GSFH set up, so just another manifold and pipework to add. Don't know what the rest of the system is operating at in terms of final slab temp, but will try to fins out. Am hoping 16mm will do because there is an area of the route where it will have to come quite shallow, and 25mm might not be able to be buried fully enough.

    All is a bit ambiguous at the moment. I know there will be a high power all-electric range cooker, a couple of washing m/cs and tumble dryers, plus the general kitchen kti like kettle/toaster etc, then there will be a lounge area with the usual TV stuff etc, so am thinking 1 x 50A cct for the cooker and 2 x 32A rings for the rest, plus a 6A general lighting circuit. Nothing is finalized and no plans or other specs for kit etc exist. The job has been thrown at me at the last minute, and all I know is that concrete is booked to be poured next Tuesday!

    Am thinking something like a 70A supply via 16mm 3 core to a new cu and then await further developments!
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  • 0
    Andy,

    When you say 40', is that the actual temp of the slab? Am assuming 'C rather than 'F! The new area will be heated from the existing GSFH set up, so just another manifold and pipework to add. Don't know what the rest of the system is operating at in terms of final slab temp, but will try to fins out. Am hoping 16mm will do because there is an area of the route where it will have to come quite shallow, and 25mm might not be able to be buried fully enough.

    All is a bit ambiguous at the moment. I know there will be a high power all-electric range cooker, a couple of washing m/cs and tumble dryers, plus the general kitchen kti like kettle/toaster etc, then there will be a lounge area with the usual TV stuff etc, so am thinking 1 x 50A cct for the cooker and 2 x 32A rings for the rest, plus a 6A general lighting circuit. Nothing is finalized and no plans or other specs for kit etc exist. The job has been thrown at me at the last minute, and all I know is that concrete is booked to be poured next Tuesday!

    Am thinking something like a 70A supply via 16mm 3 core to a new cu and then await further developments!
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