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calculation

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  1. K

    cable calculation

    Hi please can someone assist me in confirming the correct size for sub board. ( ie ) i have 4 motors rated at 18.5kw feeding each motor individual 16mm swa distance 50mtrs . From supply to d/b 50mm swa 100mtrs protected by 200a if full load was to be used. any thoughts appreciated
  2. E

    SAP Calculation

    Hi, in the SAP calculation 0.8*kWp*s*ZPV is the kWp the peak output of the pv array or the output from the inverter? Thanks.
  3. M

    Distance Calculation to find fault

    Does anyone know or where to find the calculation you do to find a fault/break in a circuit that can't be physically traced.I'm sure i've seen it somewhere in one of my books but can't remember. Cheers
  4. SolarCity

    SAP calculation figures vs. PV SOL figures

    I am becoming increasingly frustrated at the survey handcuffs we all have to wear regarding performance figures. While I can see the benefit of maintaining an industry standard for evaluating system performance, I find it a little baffling that we use such a vague and general standard such as...
  5. G

    Pv array test calculation excel sheet

    Guys This might help you!!!! if the file attaches with the formulas!!!! Just enter the Isc and Voc and it will calculate the final Isc at the correct radiance. Let me know if it works. The file won't attach for some reason ( bl---dy computers. I will send it via your email If you PM me with...
  6. A

    Harmonic filter problem ---- computer harmonic analysis using EasyPower software

    I will just apologize to everyone in advance because of my English,, as well as for long post, I just don't know how shorten it :o.. I'm expirencing some problems (that are more "theoretical" nature) with harmonic filters.. I can't seem to find how to properly calculate the values for...
  7. S

    Calculation need helps

    1. A 630 kVA transformer feeds a 3phase 400 V 50 Hz main switchboard located at distance of 100m and is connected using 2 parallel runs of 240 sq.mm 4 core copper cable buried underground. An arc fault takes place on the bus terminals while an operator is trying to do live work in a panel (with...
  8. 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
  9. D

    capacitor sizing calculation

    does anyone know how to calculate capacitor sizes for capacitor start, capacitor run single phase motor? manufacturer info not available.
  10. 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...
  11. 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)...
  12. L

    dol starter overload calculation?

    How would i calculate the overload setting needed for a 3 phase 0.5kw dol motor?
  13. 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 ---------------------...
  14. 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
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. P

    calculation for maximum demand

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

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