calculation

  1. S

    R1+R2 Calculation

    Carrying out a PIR on a Auto Garage the ring main is wired in metalic conduit with no earth cables what is the calculation to acheive R1+R2
  2. E

    Voltage drop calculation format

    VOLTAGE DROP CALCULATION FORMAT hi my friends, is anybody have voltage drop calculation format? AND THERE BEEN SOME CHANGING OF OPINIONS AND ADVICES AS FOLLOW 1ST REPLY Shabu there's a few ways of calculating volt drop, the vast majority provide you with an "average" assuming the load is...
  3. B

    Volt Drop

    This is a 2391 question DURING THE COURSE OF AN INSPECTION ONE OF THE SINGLE PHASE RADIALS supplying an item of fixed equipment is to be checked for volt drop. 45A full load, 80m length, 10mm singles,70 degree thermo singles, steel conduit, mohms/m at 20 degrees=1.83(p166 OSG)...
  4. L

    dol starter overload calculation?

    How would i calculate the overload setting needed for a 3 phase 0.5kw dol motor?
  5. J

    Quick CPC calculation help please

    Just need convincing that I am still doing it right! So, 16mm SWA, 50M run, 12Kw load 3P/N supply. (17.3A per phase) 16mm R1 + R2 = 1.15mOhms/Meter = 100x1.15/1000 = 0.115 ZS = 0.21 + 0.115 = 0.325 230/0.325 = 707A (fault current) √ 707 x 707 x 0.1 ---------------------...
    • J@mes
    • Thread
    • aus calculation cpc help help please please quick
    • Replies: 10
    • Forum: Australia
  6. J

    17th edition exam: What sort of calculation questions can I expect to get...

    Got my 2832-10 coming up shortly, just wondered what sort of 'calculation' questions I am likely to encounter:confused: Cheers
  7. P

    loop impedance calculation

    hi i am doing 2330 and we have been given some calcs to do but the handouts they give are pretty poor i've had a go at the first one but need someone to tell me if i'm going wrong ( A downstairs lighting circuit of 90 metres is to be wired in 1mm thermoplastic (pvc) twin & cpc with an over...
  8. M

    Calculation

    How do I work out the following question; When measuring the insulation resistance between live conductors of five existing circuits in the installation the following results were obtained. 185Mohms, 150Mohms, 20Mohms, 200Mohms, 2.5Mohms State a)the value of the installation resistance if these...
  9. M

    Induced Emf Calculation

    hi all just going the trevor Linsey advanced installtion work level 3 and i'm struggling with a calculation regarding average induced emf..the Question is : The Magnetic flux linking turns 2000 turns of electromagnetic relay changes from 0.6 to 0.4 mWb in 50ms. Calculate the average value of...
  10. C

    Calculation query for shower circuit

    As above really, just want to double check something. 10.5kW shower, 20m run, under floorboards in insulation, 10mm t&e. Ib=10500/230 = 45A As most of the run is in insulation, Ci factor is 0.5, so It must be greater than Ib/0.5 So basically I need a cable with 90A capacity under ref...
  11. R

    Cable Calculation

    Hi Sorry if I’ve posted this in the wrong area. Do the tabulated values for the current carrying capacity of conductors in bs7671 include the 1.45 rule of thumb? I.e. a 32amp type B should trip within an 1hr at 1.45x it’s In (46.4amps) So do I look for a cable that can take 46.4amps, even if...
  12. P

    calculation for maximum demand

    Can anyone show me the maximum demand calculation or tell me were i can find it
  13. W

    Can anyone help with another calculation please ? lol

    Right, this time it is on capacitance... now the equation is simple enough & im sure iv got it right and come to the right awnser in the process however, im pretty sure my tutor said there was a way of making the number that you get back smaller, but i cant remember what he said. For instance...
  14. W

    Can anyone help with a calculation please ?

    Hey. Basically, we are doing alot of calculations in college at the moment on resisors in series and parallel circuits. Iv pretty much got everything down apart from calculating current in the parallel branch of the circuit. I have a couple of ideas which may be the way to do it, "or not" im...
  15. C

    Calculation help needed!

    Hi all with regard to BS 7671 page 48 (411.4.5) can someone tell me in plain English how to do these calculations. As I am trying to calculate the following question: The fault current due to an earth fault of neglible impedance in a 400 V three phase, four wire circuit having an earth loop...
  16. C

    Calculation help!

    Hi, With reference to BS 7671 on Page 128: Using the mathmatic formula can anyone tell me how to punch in a calculator the workings out of the following: When calculating the minimum cross-sectional area of a protective conductor, the following is available: Fault current = 650A Op time...
    • chrisgc
    • Thread
    • aus calculation help help!
    • Replies: 9
    • Forum: Australia
  17. K

    *Voltage drop Question Calculation help*

    Hello guys looking in, Just want to make sure i'm doing this right as i'm still a bit fresh, This is the senerio as follows, Single lighting circuit from a 230v supply on a 10 Amp MCB. 1.5mm PVC Singles total length from board to furthest point 40 metres. 1500 total watts of various...
  18. B

    Cable Calculation

    Hi, I was looking through old exam papers and came across the following question; A 2-core distributor cable of uniform csa is loaded as follows: Point B = 30A Point C = 90A Point D = 62A The cable is supplied at End A at 229V and at End E at 231V. The resistance of the cable is 0.01...
    • Blueday
    • Thread
    • aus cable calculation
    • Replies: 1
    • Forum: Australia
  19. D

    prospective earth fault

    if you were to work out the value of the prospective earth fault by calculation at point of the supply, what values would you need to do this calculation :confused:
  20. S

    3ph + E Zs calculation?

    Can anyone tell me how to calculate the zs in a 3ph+E installation as my tester will not give me a reading. I've looked into it and a special loop tester is needed, if this is right? Thanks Paul
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