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calculation

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  1. M

    T & E in conduit calculation help please

    Hi Guys, I apologise in advance as I have done this a**se about face, I have just finished putting power to my shed ( I am currently training to become a sparks got my 17th edition at pass in Watford shortly) and hoping to use my shed as my part p inspection as hoping to join ELECSA. Anyhow I...
  2. 5

    SWA cable calculation.

    sorry if I'm dwelling on this but have to supply 230v to a hot tub on PME. load 32amps. separate RCD back at the house, 54 mtrs away. exporting PME through third core and armoured sheath. no extraneous conductive parts at the tub. MCB 40amp type C ZS - 0.57ohms Cable is going to be clipped...
  3. spud1

    Calculation of grouping factor for 3 phase tails

    Hi, when determining a grouping factor for a galvanised trunking containing 3 phase tails, and when consulting table 4C1 BS7671 to determine the factor does each phase/tail count as a seperate circuit or are the tails considered in themselves one three phase circuit? Thanks
  4. L

    electrical energy calculation in 3phase

    HI I have a MCC panel it is showing KW reading for each phase L1,L2 and L3 are 4.7KW,4.0KW and 4.2 KW repectively. the energy consumption for 2 hours was 16 Kwh.how come it is possible my doubt is my load was stable for 2 hours with 10-15% variation i should be 8-10 Kwh for 2 hours why it...
  5. 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.
  6. 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...
  7. 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
  8. T

    Heat loss calculation software

    Can anyone recommend a heat loss calculation software?
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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!!!
  18. 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
  19. 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...
  20. 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...

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