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calculating

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  1. Amp David

    Calculating the current of forktruck charger

    Back now, charger has a rating of 110 amps 24 volts on the charge side of the charger, so am i right in calculating the power drawn as being 110 x 24 = 2640 W so 2640 / 230 = 11.5 A Single phase and not 3
  2. Sparky Ninja

    Megger Mft 1730 calculating R1&R2?

    A student of mine had his new toy delivered today (delivery first thing, thank you very much Tester Meter). We've had a play with it and I am surprised to see that it has a method of caculating R1&R2 as what appears to be normal practice. You turn the dial to Zref, make a loop impedance...
  3. S

    calculating diversity for lighting circuit

    Hi I'm sitting my unit 4 exam for C &G 2330 electrotechnical course. I'm a little confused to calculate the answer to this question I can't get the same answer 10 x 60w fluorescent lamps will have an assumed current demand at 230v of a. 2.6A b. 4.35 A c. 4.7 A d. 7.83...
  4. S

    Calculating the load demand to supply cables

    How do i calculate the load demand to supply cables for the following situation:- A 3 phase load of 20kW SUPPLIED AT 400V with a power factor of 0.6
  5. J

    Calculating Max Zs for BS 3871 MCB

    Hi there, I am just trying to work out the Max Zs for a Type 1 13A Page 58 OSG Table 7.5 for Type 1 do i multiply 13A by 4? :confused: This gives me a Max Zs of 4.42Ohms :rolleyes: Is this correct or am i way off Appreciate any replies Cheers Justin
  6. 1capybara

    Diversity factor for calculating loads ???

    I am a Yank electrician, I cant find where in 16th or 17th edition you have the diversity factor for calculating loads. Example: 1. In one office or sleeping room I put 4 power sockets on a 32 amp ring circuit. We have 100 identical sleeping rooms or offices. What is the total load that we...
  7. P

    Calculating maximum demand

    Hi again I also have a query about determining the installations maximum demand for when an electrical installation certificate must be filled in. I have calculated the demand for my test scenario using Appendix 1 of the On Site Guide as 103.92A using the breaker values. However I have seen...
  8. O

    Calculating 20% VAT content of an invoice?

    I don't see this type of query anywhere on this site - but if this is repetition, perhaps some "kind soul" will direct me to the correct site? My question is:- I still receive bills from companies e.g. TalkTalk, that only show a gross invoice total (incl. VAT) but omit to show the 20% VAT...
  9. E

    calculating Zs with only R2 reading

    is it possible to calculate zs by only using r2 + ze reading??
  10. I

    Calculating Current For A Contactor (3 Phase)

    Lads How do you work out the current on a 3 phase contactor, the motor is .80kw ?? I hope this makes sense Chris
  11. V

    calculating Zs at socket outlets

    Hi all After some advice on measuring Zs at socket outlets using the megger 1553 what setting should the megger be on for this test ? i no i have to use the plug in plug i got with my megger just not sure what setting the megger has to be on ? I no how to calculate Zs by calculation using Zs...
  12. E

    Calculating earth loop impedance

    Hi all R1 + R2 +Ze this equates to Zs but does this also equal the earth loop impedance, can I calculate ELI instead of measuring it, or are there other factors involved?
  13. S

    Calculating R2 from R1 and RN

    WHen doing the continuity of a ring main and the cpc is 1.0mm should the reading be 1.25 times the R1 or Rn value. And 1.75 if its 1.5mm?
  14. C

    Sub Contracting - Calculating Travel expenses

    Hi I'm subbing to a contractor & they've agreed a travel rate for using my own car to get to site & back... Should I be deducting my 20% off my fuel expenses when I invoice or put in the full amount? They're paying 20p per mile... What's the deal with everybody else?
  15. P

    Calculating lb and voltage drop

    Pre empting my 2382 and trying to calculate lb so as I can calculate voltage drop. Circuit I have used for this is an upstairs lighting circuit, 1mm2 t&e 4 light points and length of approx 19m. Cable installed to ref method C. Getting myself a bit confused but this is what I think I...
  16. F

    iPhone App (iBend) designed for calculating conduit bends.

    Hey guys, I'm not sure how many of you have a iPhone but thought I'd share the love and hopefully help some of you out at the same time. I've noticed a few posts about conduit calculations and maybe this application could help? iBend Pipe Let me know what you think! :D
  17. D

    Calculating volt drop, cable selection and mcb selection on an 3kw motor

    Any explanations on how this is calculated ? Diversity : By referin to table 1b in the osg, it states : 100% largest motor ?? ...3kw ....??? 3000/230 = 13.04 A....is this it !!?? max demand ?? How there on would you make cable selection , mcb selection ?
  18. N

    Calculating 3 phase kva

    My brains switched off chaps and i can remember how to calculate 3 phase kva i know its V x I x 1.73 / 1000 so is it 230 or 400 x I x 1.73 / 1000 fee a right numpty cant belive ive forgotten it not done 3 phase calcs for a while please enlighten me to the correct figures then ill give my...
  19. A

    Calculating the voltage drop across a PVC insulated cable- 35mm copper conductor

    I am adding a new Air handler panel to a building and its load is 5421KVA. How do I go about getting the the start up current when the phase voltage is 240V? On obtaining the Start up current, now how do I calculate the voltage drop when the cable that I am thinking about using is the 35mm sq...
  20. M

    calculating demand

    When calculating the demand for discharge lamps, what is the recommended multiplying factor that should be applied?

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