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calculate

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  1. G

    how to calculate power of motor to b used ?

    Hi all, I need to know that if we have to install motor and a pumping set how would we know that how much horse power motor should b installed?
  2. Simonslimline

    Voltage Drop

    When selecting a cable and taking voltdrop in to acount is it 3% for lighting or 5% for other loads of 230v Because the voltage obviously changes from anything from 216V up to 253V. Thanks :)
  3. kingeri

    EFLI - measure or calculate?

    Just wondering what you guys generally do to determine the EFLI of a circuit during testing. Do you calculate it, as in Zs=Ze+(r1+r2), or do you measure for each circuit, or both. I tend to calculate it these days, simply as it's quicker, but just wondered what others do.
  4. 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.
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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.
  10. 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...
  11. 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??
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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???
  19. 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...
  20. 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...

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