calculations | Page 5

calculations

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  1. R

    Zs Calculations

    Hi im writing this post as ive read loads of information regarding adjusting Zs values due to temperature. If I go wrong anywhere in my explination please correct me : D sooo.... When doing inital verification Ze should be measured aswell as R1+R2. The R1+R2 value should then be adjusted for...
  2. S

    p v panels calculations

    hi been a long time since i was at collage so some info please 20 pv panels at 230 volts = 2300 kw at 1 string but 2 strings halfs the volts but doubles the amps is this right if so how is a 4 kw system worked out please shed so light on this all answers email to [email protected]
  3. W

    cable calculations

    hi, have a cable calculation question. what size off cable do i need to run to supply a mushroom house. its a 70 meter run of swa cable buried in the ground, the load is 12 amps lighting and sockets and a cooler taking 32 amps all this is single phase loads. there is also a 3 phase machine...
  4. W

    calculations

    if a 3phase machine takes 15kw total how do you work out current per phase
  5. B

    Help with ring main calculations

    A client has asked us to provide cable sizing calculations including voltage drop, short circuit rating, source impedance, circuit impedance and fault current of a ring main we have installed to ensure that our 2.5mm ring is suitable for the application. Cable size 2.5mm System voltage 254v...
  6. W

    Are my calculations correct?

    My ex-Next-Door-Neighbour has asked me about changing a shower at his new house. Now I can't do it, (I'm not a scheme member) as it's not a like for like, he wants an uprated one. But I told him previously he would be looking at replacing the 6mmsq Twin+cpc with 10mmsq if he wanted to uprate...
  7. D

    please check my calculations

    hi guys i did my 17th edition in 2008 and ive not done much in the trade since then ide be most gratfull if someone would please check my calculations 1 cooker hob rated at 5.7 kw 1 oven rated at 4.8 kw so total is 10.5 kw / by 230v gives me 45 amps after doing the diversity calculation...
  8. S

    LV Incoming mains calculations for 66 Flats

    I have been asked to calculate the size of HV transformer needed for a resort of 66 small 1 bed flats, they will be 2nd homes in the sun. Each room has a maximum load of 50Amps 66 rooms X 50 Amps = 3,300 Amps Not everyone will use every electrical appliance all the time, so we can reduce...
  9. T

    3 Phase motor windings Resistance Calculations ?

    Hi All Is there a calculation for working out an unknown resistance on a 3 Phase Motor ? The rating plate has 15kW / 29 amps . Trying to remember from my collage days but it has been a while. Regards Tailspin :confused:
  10. S

    Formula Calculations Help!

    Hi Was wandering if someone could help, I'm a first year level 2 student and we have just started calculations and I'm stuck on a couple: 1. Calculate the thickness of an aluminium busbar 60mm by 12m long which has a resistance of .000946 ohms (given that aluminum has a resistivity of 2.84...
  11. P

    electtraical calculations

    hi all im doing my 2230 level 3 and have prombles with my calculations with be most greatfull for and help if there anything out there thanks chris
  12. S

    calculations

    hello, this is going to be one of those qestions when i hear the answer it will come back to me, but at the moment its not! when you mesure the end the end resistance of a ring main there is a calculation to work out the length of the circuit can someone enlighten me with this formular...
  13. E

    Volt drop calculations

    It's been some time since i've needed this but can anybody out there supply the formula
  14. S

    Reliability of measured Ze for Zs calculations

    Afternoon all. Re-doing my calculations for a hot tub supply after client upgraded the specs. Details are: Hot tub rated at 16A. Supplier advises to use Type C breaker to handle inrush when pump starts. 26m from CU to Hot tub via rotary isolator switch. I was proposing to use a 20A Type C...
  15. L

    CU Change for assessment

    Ive changed a CU for my assessment and rewired the upstairs lights due to no cpc, will the assessor want to see calculations for cable size and voltage drop for rewiring the lights? and will he want max demand/diversity calculations for the CU and on the inspections, what happens if a box...
  16. C

    Calculations

    Hi All, Ok here goes - R1+R2 calculations. Using 2.5 T/E cable the calculation to find R2 is divide by 1.67 (or something similar). Is there a calculation for using 1.5 T/e (1.0mm cpc). 4mm T/E, 6mm T/E etc etc ???????????????:confused:
  17. A

    Cable Calculations

    Hi everyone, Ive got to install a sub main for a large bugalow. The supply is in the garage and the 2 nd mains board is approx 40 meters away. I was going to use 16mm t + e, 1 meter in trunking then the rest will be in the loft clipped high up away from the insualtion. ( so no RCD) It will be...
  18. M

    RCD Calculations

    Hi All, I would be very gratefull if anyone can clarify the correct method to calculate correct rating of RCDs, as I have read numerous threads which seem to differ. I have just completed my Level 2 C&G 2330 and understand the cable calcs, but haven't asked my tutor this question yet. Here's...
  19. F

    hey all,anybody know best book for understanding formulas

    struggling with getting my head round formulas,anybody know any books which are good or any tips...cheers
  20. S

    Volt drop and cable calculations

    Hi guys, does anybody have a quick or easier way of working lout volt drop or cable calculations?? Basically, a way of working out if cable size and length is suitable for design? I am always looking in OSG and BS7671, so wondered if any easier way. Thanks guys and speak soon. Sav :)

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