calculate

  1. T

    calculate 12v batteries needed to power a 230v fridge.

    I am wanting to experiment with solar power at home. I want to try and power my fridge freezer as it is the only thing on at home all day. Can you advise what kit i need.
  2. A

    From Voltage Source to the Machine

    I have a project assigned to me, i.e. to calculate/compute the wire size, length, put a motor control in a Plastic Machine. I have some sources available, but still I want to know from the best people of this Forum. Please assist me on how to compute the wire size, wire type, type of controls...
  3. J

    Calculate the min size of cpc giving consideration to disconnection times and thermal

    Hi everyone, On the drawing it says the system's TN-C-S with declared Ze = 0,008 Ω and prospective fault current declared as 50kA When I calculate If = Uo / Zs = 230 / 0,716 = 321 A . With this value there's no way to match with 10A curve at fig. 3A6 (appendix 3) But if I calculate the...
    • JuniorSparky
    • Thread
    • calculate cpc disconnection disconnection times size thermal times
    • Replies: 28
    • Forum: UK Electrical Forum
  4. 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...
    • Andy1
    • Thread
    • 3 phase attach calculate calculation neutral phase roman wire
    • Replies: 2
    • Forum: UK Electrical Forum
  5. M

    How to calculate

    Hi please help i have gone looking for the calculation on watts per hour and the costs but it all seems a bit long winded, lets keep it simple 60 watt lamp GLS left on for 8 hours are will billed in hours although we are using units also do we convert the lamp in to hours then how do i work out...
  6. C

    help calculate cable size for 130kw

    i am struggling to work out the cable size required for the following air con unit. the run of the 4 core swa cable will be about 90 metres, where 85% of it will be underground.
  7. E

    How to calculate battery backup power needs

    First of all, I would like to apologize for creating an account solely to ask my question. I honestly don't know where else to turn to find out this information; I've exhaused every google search and the knowledge of people around me. I'm hoping someone won't mind helping me with this. I live...
    • electroguy
    • Thread
    • backup batteries battery calculate device how to needs power watts
    • Replies: 9
    • Forum: UK Electrical Forum
  8. E

    testing zs - EAWR

    on an eicr is it right or wrong to test for zs or is it putting us at unneccassary risk of shock ?? If the regs say we CAN calculate using Ze+(R1+R2)measurements taken during dead testing then SHOULD we?? ! anyone any clear cut answer on this 1??
  9. P

    Voltage drop

    Hi all If an outdoor circuit comprises 2.5mm SWA running to adaptable box where it then splits into 2 x 1.5mm SWA cables for lighting, socket etc. how is the VD calculated? I presume the VD for the 2.5mm run is calculated up to the adpatable box and added to the 1.5mm VD for each additional...
  10. M

    R2 Testing Help

    Hello i havent done much testing before so i am trying to brush up on my Testing skills before i join Elecsa, i have a couple of questions about R2 testing please. I understand how to carry out R1 R2 tests using method 1 and that we do them to calculate the Zs of our circuit Zs=Ze+R1+R2 But i...
  11. M

    Cable Mate Software

    Hi is anyone on here using the cable mate software? Ive just bought it, just waiting for my registration code to come through. It looks very good. Cable-Mate This software will calculate the minimum cable size for copper cables up to 1000mm². It also allows you to: Check Disconnection...
    • markthespark
    • Thread
    • cable calculate check mate phase software
    • Replies: 5
    • Forum: UK Electrical Forum
  12. S

    how to calculate the size of cable from one DB to another DB

    I am currently studying the 2357 qual and have got a little stumped on a question about the size of cable between 2 DB's. What i am stuck on, is that i am not sure if the cable is sized using the size of mcb used for each of the circuits at the new DB, or whether its done by the rating of each...
  13. G

    How to calculate PFC

    Hi guys, Sorry if this is in the wrong place, im new to this! Right... Im currently doing my level 3 EAL assingment for electrotechnical engineering and im stuck on one of the questions. It would be great if someone out there could give us a hand. The question is..... State hot to...
  14. B

    calculate over current protection csa

    hi all have a 32A 3036 circuit which feeds a 45A DP isolator from there 3 radiale circuit wired in 1.5mm with fuse spur providing upstream over current protection now can any one remind me how to calculate short circuit current to be sure cable will be protected due to a short feed side of the...
  15. M

    Conduit as earth????

    Hi all done some testing work at a hospital and the orignal wiring was done in metal conduit, now the zs figures tested all good, my question is can u calculate the r1 and r2 figure when their isnt an earth cable as such???
    • mickytuff
    • Thread
    • aus cable calculate conduit earth reading
    • Replies: 15
    • Forum: Australia
  16. F

    How to Calculate Connected Loads

    I am currently training as an electrician and have been set a question and was hoping someone please explain to me how to calculate the connected load if I have a mixture of single phase and three phase loads, and I have a three phase service connection from the utility. For instance, is the...
    • freakydeakie
    • Thread
    • aus calculate connected how to loads
    • Replies: 6
    • Forum: Australia
  17. M

    How to calculate temperature adjusted maximum Zs values

    Hello, I have my practical 2391 test on Friday and have been told by the examiner that we will be required to complete the calcuation for the maximum operating temperature for Zs. I am unsuse what to do with the calculation. From guidance notes three (second example down, pg 113), it...
    • mick525
    • Thread
    • aus calculate how to maximum temperature values
    • Replies: 15
    • Forum: Australia
  18. S

    How to calculate the true power|!

    I need to calculate the true power and reactive power and i no the formula for true power is V x I x cos and reactive power is apparent power-true power squared. however the figures it have been given are the load size of 50KVA at a power factor of 0.7??? any help on this would be appreciated...
  19. L

    how to calculate and avoid the Voltage drop at starting of gas compressor

    In a gas power plant There are 2 main transformers ( st1 , st2 ) taking from the grid 380 kv and step down to 13.8 kv ,and then feeding the main bus which it is divided into 2 buses ( A Feed by st1 , B Feed by st2 ) between them bus tie st1 = 380 kv/13.8 kv st2= st1 Bus A feeding gas...
    • live11
    • Thread
    • aus avoid building calculate compressor feeding gas how to plant starting voltage voltage drop volts
    • Replies: 1
    • Forum: Australia
  20. L

    how to calculate and avoid the Voltage drop at starting of gas compressor

    in a gas power plant There are 2 main transformers ( st1 , st2 ) taking from the grid 380 kv and step down to 13.8 kv ,and then feeding the main bus which it is divided into 2 buses ( A Feed by st1 , B Feed by st2 ) between them bus tie st1 = 380 kv/13.8 kv st2= st1 Bus A feeding gas...
    • live11
    • Thread
    • aus avoid calculate compressor gas how to roman starting times voltage voltage drop volts
    • Replies: 8
    • Forum: Australia
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