factors | Page 3

factors

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  1. E

    re cable correction factors

    hi guys, this is my first question so please be patient, as part of a b-tech study i have to design a circuit and state the size of cable used, iam going wrong somewhere but where so here is an example. Ib = 9000/230 = 40 amps (rounded off) In = 45 amp RCD. now this is where i sort of...
  2. G

    Hi all help wanted

    hi all new to this site and was wondering if anyone had the answers to junes 2391 exam paper,i attained a copy and was wanting to check my answers cheers
  3. D

    Tri-Rated Cable de-rating factors.

    Hello, Tri-Rated cable has a derating factor of 0.80 for two cores. Does anyone know if this refers to two cores of different circuits or two cores of the same circuit? Basically, I am wanting to run 10mm tri-rated (in conduit) for my new shower installation and am trying to de-rate it...
  4. G

    Shower cable sizing

    There seems to be a lot of ambiguity and difference of opinions on the Forum regarding shower cable sizing. I have one to fit, 9.7Kw through a seperate RCCB and 50a MCB shower unit via a Henley block using 16mm tails. @ 11m run - 6m capped trunking, 3m under floorboards and 2m clipped direct in...
  5. J

    Cable rating factors?

    I understand how, when & why to apply C factors for cable selection etc. (I think!) but I can't get my head round why In is used in the equation for It and not Ib? :o
  6. R

    thermal derating factors

    When calculating a thermal insulating rating factor from Table 52.2 [523.7] if the figure is between two of the given numbers do you go up to the next figure or down? For example if the insulation was 150mm would you count it as 200mm (derating factor 0.63) or 100mm (derating factor 0.78)...
  7. M

    Fusing Factors / Trip

    Fusing Factors BS3036 - 1.8 to 2.0 BS1361 - 1.6 to 1.9 BS88 HBC - 1.25 to 1.27 MCB's up to 1.5 Then Table 7.5 OSG P58 states B Type 3-5x In C Type 5-10x In D Type 10-20x In I understand that if youve got switching surge flouescent lighting C type is favouable over B type if Zs complies as it...
  8. S

    grouping factors in metal trunking

    hi everyone got a querry regarding above. through approx 1.5m om the installation all the main cables run through a 4" x 4" metal trunkning, was wondering if anynone is knowledgable at working the grouping factors out?? got a lot of pvc/pvc running though cheeers

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