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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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    Had a chat with UFH people about final slab temp.

    They said -
    1. Max operating temperature of slab?
    Answer - Do you mean the floor/screed? If so the flow temperature of the water will vary between 25 – 45 degrees C which will give an average floor temperature of 5 – 25 degrees C.

    They also said that they run the pipework aroiund 100mm from walls, so I guess I have that to play with for my cable.

    UFH pipework is fixed at 150 centres elswhere so I might ask if they come another 50mm away from my cable run.
Reply
  • 0
    Had a chat with UFH people about final slab temp.

    They said -
    1. Max operating temperature of slab?
    Answer - Do you mean the floor/screed? If so the flow temperature of the water will vary between 25 – 45 degrees C which will give an average floor temperature of 5 – 25 degrees C.

    They also said that they run the pipework aroiund 100mm from walls, so I guess I have that to play with for my cable.

    UFH pipework is fixed at 150 centres elswhere so I might ask if they come another 50mm away from my cable run.
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