calculation

  1. A

    Possible Job For Tomorrow

    Reported as occasional trip of an RCD. Leakage current noted 2.5A when cooker switched on (which is on a 30mA RCD). Could be interesting.
    • Andrewr3
    • Thread
    • calculation correct electrical work leakage possible tomorrow working
    • Replies: 90
    • Forum: UK Electrical Forum
  2. B

    DC cable calculation 1250amps 48v

    Hi This is my first thread so Hi!:smile5: I have a job where I have to run a supply to a PDU in a data hall. (a 48v large panel board) The parameters are load 1250amp,48v DC, 1% VOLT DROP, preferably using HO7 singles in parallel Could anyone help with the design or give me the calcs...
  3. K

    LV Tails Calculation

    I want to calculate the tails to a 200 amp fused switch from a 400 amp busbar, The main incomer before the busbar is a 400 amp fused switch fitted with 315 amp fuses. The DNO fuses are rated at 365 amps. Regards Keith
  4. T

    Heat loss calculation software

    Can anyone recommend a heat loss calculation software?
    • TJLinks
    • Thread
    • calculation download heat materials reference section software
    • Replies: 4
    • Forum: Green Lounge (Access Only)
  5. M

    Voltage drop calculation

    Hello everyone just want a little help how you would calculate the volt drop if 230 single phase heater circuit line & neutral conductors combined resistance of 0.68 Temperature at 20 degrees and load current of 16A? show calculations got this in my 2395 today wanna make sure I used the...
    • Missing-spark
    • Thread
    • calculation calculations length method that's voltage voltage drop volts
    • Replies: 13
    • Forum: UK Electrical Forum
  6. D

    3 phase motor current calculation - from winding resistance

    Hi, hopefully someone can help or put me straight on this. i have a 3 phase/415v motor which is 11kw - 15kw, 15A - 28A depending what voltage is applied in either star or delta. measured the winding resistance which is 0.55ohms between the 3 phases. now i do think this winding resistance is...
  7. L

    ZS measured higher than zs calculation

    I was wondering if anyone can help me out with this conundrum. I was testing a domestic property and tested a security alarm which was a 6A MCB not supplied by any RCD. Ze was 0.12 Ohms R1+R2 was 0.10 Ohms Now using the calculation I assumed the reading would be no greater than 0.22 Ohms...
  8. E

    swa calculation

    I need to work out if I will be required to run a separate protective conductor along side the swa cable I'm going to install. The cable is a sub mains feeding a 3 phase db panel in a large workshop. The cable is going to be a 50mm 4core 120 metres steel wire armoured installed in a underground...
  9. P

    Volt drop calculation

    Hi, Thanks in advance for any advice! I was called out to a client’s swimming pool, as there was a fault on the pool lights. I found that someone had installed 2 x 12 volt 300 watt lamps, recessed underwater into the pool walls, using 10mm cable in parallel so that there are 2 neutrals and 2...
    • pcasey
    • Thread
    • cable calculation lights meters transformer volt drop voltage volts
    • Replies: 22
    • Forum: UK Electrical Forum
  10. J

    Diversity calculation check

    Hello all Would someone please cross check my calculations? Cooker induction HOB ONLY, oven is on a separate wall with seperate 6mm cable. 4x elements 1400, 1800, 1400, 1800=6400w total. 6400w / 240v=27A 27A-10A=17A 30% of 17A=5.1A 5.1A + 10A = 15.1A plus 5A socket =20.1 A total Note the...
    • jimbobaroobob
    • Thread
    • calculation check diversity
    • Replies: 2
    • Forum: UK Electrical Forum
  11. M

    Exam revision calculation

    Can someone please help with the following exam question revision. Have seen the same question twice now on two different exam papers and each answer supplied by them have been different. I am confused. A radial socket outlet is supplied by a 2.5mm2/1.5mm2 cable that is 20m long. Given that the...
  12. saucyjack

    Spur calculation confusion!

    Hi guys, I wonder if someone would be kind enough to help me understand the answer to this question from a well known guide-book on 'Inspection, testing and certification of Electrical Installations', 'cos I can't work it out for the life of me! Q: A ring circuit is wired in 4mm2 singles in...
  13. H

    AC or DC power calculation

    Hi Guys, Is the calculation different when working out Power consumption of a ystem with a DC supply rather than an AC supply? I know P=I x V So i can do P = 2A x 230V AC But is this different with a 12V DC power supply??? Thanks in advance!!!
    • harrison2987
    • Thread
    • calculation dc power power
    • Replies: 3
    • Forum: UK Electrical Forum
  14. T

    calble calculation Ib

    hello all Im a trainee and have a question about Ib, If im working out cable calculations for a 63amp sub main with a 6amp and a 32amp mcb then what would my Ib be? is there a way or do you need to know wattage such as a 3kw water heater for example? please help thanks Terry
  15. P

    Electrical design problem calculation

    A single-phase radial circuit is to be installed to supply a number of socket outlets. The source of supply is 230 V, 50 Hz with a declared value of external earth fault loop impedance, Ze, of 0.8 Ω. The cable selected is PVC-insulated and incorporates the circuit protective conductor. The...
    • psjaivansh
    • Thread
    • calculation design electric electrical problem
    • Replies: 11
    • Forum: UK Electrical Forum
  16. G

    Battery calculation please?

    Hi, im looking for a little advice on batteries... im after the calculation for working out how long a battery will last. for example if i have a 17Ah battery and the draw is 900mAh how many hours will the battery last? Also, if i charge the battery off a 5A PSU how long will it take to fully...
    • greensec
    • Thread
    • battery calculation charge charging hours please
    • Replies: 6
    • Forum: UK Electrical Forum
  17. 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
    • chance1111
    • Thread
    • answer cable calculation electrician voltage voltage drop volts
    • Replies: 17
    • Forum: UK Electrical Forum
  18. 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...
  19. 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?
  20. 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...
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