calculations | Page 6

calculations

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  1. S

    Volt drop and cable calculations

    Hi, does anybody have a quick or easier way to work out volt drop and cable selection calclations ?? I always refer to the BS7671 and OSG, but wondered if anyone had an easier way to work these out. Cheers guys and speak soon Sav :)
  2. B

    Transformer calculations

    Hi, im struggling on some formulas at the mo, wondered if any one could help? vp/vs=np/ns=is/ip vp=230v vs=12v np=800 ns=? ns=npvs=800x12=42 vp 230 how do i find the Is and Ip? Thanks for ur help
  3. A

    Power to an out building

    Say you wanted to power a shed office, or somethign similar, and lets say it's up the end a garden. Would you split at the meter to an isolator switch or a breaker then swa all the way up to a new CU. Then for earth would you have to use an earth spike instead of the earth down the armoured...
  4. W

    pfc calculations

    hi guys doing calculations ov pfc at the consumer unit i have a ze=0.09 getting the figure ov 24ka doin 230/2400=0.09 is this correct many thanks:cool:
  5. S

    ELECSA Certification Scheme Design calculations and elecsa assemssment

    Hi All, I have my Elecsa assessment tomorow at 9am and was just looking through the requirements and it mentions about Design record keeping in the guide to conformances. Will the inspector need to see design calculations for my install and what is the best way of presenting this. Any help...
  6. A

    Calculations and Formula

    Below is a list of links that i have looked up to cover popular formula and enter the data and retrieve the answer type sites, please vote your favorites. This data could be used to set up another section if possible. 1) http://www.ifigure.com/engineer/electric/electric.htm 2)...
  7. K

    3 ph cable calculations

    Hi all, Can anyone help me as to how to calculate the maximum demand on a 3 ph supply for cable sizing? Can i just quickly estimate the demand by the breakers and multiply by a g factor i got from the IET design guide for sparks. eg 250 amps counting the breakers x 0.7 factor for mixed...
  8. M

    r1 and r2 temperature calculations

    Hi all just been going through max zs etc and all the temperature changes if i have got this right when you measure for R1 and R2 you take the temperature at the time. Apply a rating factor to get it ot 20 degrees and then when calculating zs or what ever to get to 70 degrees multiply it...
  9. S

    Differential Protection testing of a 3-phase transformer

    For Differential protection testing of a three phase Power T/F using secondary injection test set, how do we know the correct value of current to pe applied(value at which relay picks up)? Does OEM provide these values in Instruction manual or Electrical Engineers calculate these values...

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