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calculation

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  1. C

    voltage drop calculation

    i want to know the formula for voltage drop calculation for 3 core x50mm2 hv cable feeding 1000kva transformer 13.8kv. the cable is xlpe ,armored..it is connected from Ring main unit
  2. F

    Is this calculation correct?

    Hi i was looking at this old post and saw a calculation resolved which im not too sure is right and would apprciate confirmation wether it is or isnt Q24. A continuity of ring final circuit conductors test is to be carried out on a circuit supplying the office. The circuit is wired in 2.5mm...
  3. D

    KVA Calculation

    Just checking I have got the right answer , Got 50 KVA on a 3 phase system, I calculate it as 72.25 amps per phase?
  4. Spoon

    DC cable size calculation

    Hi people, Please can you help. A college at work is asking about what size cable to use for the below: 12V supply, 40A, 2 meter run and 5% acceptable loss There are lots is sites out there which I have seen, but when inputting the info I get from 6mm to 10mm and none of them tell me the...
  5. A

    3 phase 4 wire Neutral Calculation.

    Hi all, Im still in apprentice stages of becoming a sparky and currently learning allot about 3 phase at college the moment. Can anyone share their knowledge with me on how to correctly calculate the Neutral current on a 3 phase 4 wire star system when there is an imbalance between phases e.g...
  6. B

    fault calculation

    evening all i have come a cross a bit of 6.00 T+E to day feeding a range cooker backed up with a 50A breaker which I will derate as when diversity calculated will be fine.but it accured to me I had forgot how to calculate if the 50A would be OK from the disconection times side of things...
  7. S

    R2 Calculation

    Help with a calculation please? R2 = (Zs - Ze) x 1000 (L X1.2) - R1 R2 = (3.83-0.4) x 1000 (30 x 1.2 ) - 7.41 = 87.87 mOhms/m How come i keep coming up with 3401.41?? Next problem Ze = 0.4 Ohms Zs = 0.4 ( (7.41 + 18.10) x 30 x 1.2 ) 1000 = 1.32 Ohms...
  8. M

    Ring main calculation help

    Hi all I have 2 quick questions regarding domestic ring main socket circuit calculations im hoping i could get help with. 1) regards calculating Itfrom table 4D5 in the regs it states that in order to use 2.5mm conductors that it should have a max value of 27A (ref method C), im unsure how to...
  9. H

    KVA calculation

    Hi guys , im having a little moment , I have a 3 phase supply which is 100 amps per phase. I need to calculate the max KVA that can be drawn through that. I think from memory it is 300amps x 415 Volts x PF then divide the total of this by 1000 this should give me the total KVA . Sorry its such...
  10. A

    Schedule of Test Results (No 18: Zs) Calculation

    The SOTRs gives a column 18, for the Zs of each circuit. Does anyone have the workout/formula for this?
  11. E

    Sub-main calculation help!

    iv been asked to install a sub-main to supply a house. The supply is quite far away from the house (40mtr) the cable will be installed direct in ground (SWA) im abit rusty on my cable calcs and could do with some help and advice. hear is where i am at the moment... ok so after applying...
  12. W

    Urgent: Cable size calculation

    Good afternonn, I am new member in this forum and it's my first participation that I hope will not be the last! I'm a mechanical ingeenier and I'm looking for the complete and correct manner or formula to determine and calculate a cable section in a three phase circuit. It will be very helpful...
  13. R

    A.C. cable Calculation

    Hello Pricing a job that has a 48Kwp system, looking to figure out how to price the A.C. cabling from dist board to Inverter, the run is 80M, any idea? Your experience aprechiated.
  14. D

    Amps per phase calculation

    Could somebody please help me check my calculation for amps per phase for a 50KW total load over 3 phases and tell me what it should be. Thanks in advance.
  15. S

    DOL starter overload calculation

    Hi can anyone tell me the calculation for above? Got the last day of my install of my AM2 tomorrow can't remember from college and havnt had much luck searching, cheers.
  16. A

    cable calculation

    When you are detremining the length of a RFC what exactly is its length, is it the total amount of cable you will use or the amount you will use divided by 2?
  17. S

    Calculation of Max EFLI readings for type C MCCB'S

    When calculating the max earth fault loop impedance of a 3 phase MCCB that you use the nominal voltage ie in this case it is on a 60Hz system (120 / 208V ) and a 350A MCCB : therefore 208 / (350 x 10 (C type)) = 0.05 ohms Therefore Zs is required to be equal or lower than this in order for the...
  18. D

    MCS Requirements

    Just trying to find out what requirements the MCS place on solar PV companies. A few come to mind but are they requirements or recommendations? Would be good to see a full list, does anyone know of one? 1. SAP calculation 2. Structural calculation 3. Correct system design 4 Panel testing...
  19. U

    sub main cable calculation?

    morning all, im putting a sub main to another db in domestic property currently fed by single insulated 10mm tails. my question is the board will be supplied by a 63 amp breaker and is a 10m run so 10mm t&e was what I was going to use, but after a rough max demand calculation would state I...
  20. R

    KWh Calculation

    Hello, Please help me to calculate the single phase and three phase motor KWh.

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