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Submain in Singles - why not?

adi_mrok
Hello there, I have a general question. I have noticed that when you have to pull new submain from the main LV panel to local DB people around me tend to prefer using multicore for this purpose. Now I have a situation in the existing building where bending radius of 4c70mm2 is quite a problem in some areas where cable is going to run through so I wanted to use singles AWA 1 core per phase. I heard from a person that he would prefer to use multicore as "he doesn't like singles run like that". And surprisingly it's not the first time I heard it from someone and every time I try to ask what is your reason behind it I always hear something very vague. 


Anyone can explain me what is the main reason people are responding this way?
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    Just to get the discussion going...


    I can't see any fundamental objection to singles - but I can see it being more difficult in some respects - being singles you'd perhaps need far more robust cable cleating & supports to restrain the conductors under short circuit conditions (whereas the forces are naturally more constrained in a multicore cable), more labour in having to pull in four cables rather than one, glanding potentially more difficult - likely both needing a larger area of the enclosure and some means of non-ferrous support between the glands (meaning more labour or more expense or both). So I could perhaps understand a general attitude of 'try to avoid' - but of course particular individual circumstances could well trump all objections.

       - Andy.
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  • 0
    Just to get the discussion going...


    I can't see any fundamental objection to singles - but I can see it being more difficult in some respects - being singles you'd perhaps need far more robust cable cleating & supports to restrain the conductors under short circuit conditions (whereas the forces are naturally more constrained in a multicore cable), more labour in having to pull in four cables rather than one, glanding potentially more difficult - likely both needing a larger area of the enclosure and some means of non-ferrous support between the glands (meaning more labour or more expense or both). So I could perhaps understand a general attitude of 'try to avoid' - but of course particular individual circumstances could well trump all objections.

       - Andy.
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