Posting a message to the forum will remove the above advertisement

Discuss 3 phase motor over current formula in the Electrical Forum area at ElectrciansForums.co.uk.

Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. Scott48
    Offline

    Scott48 EF Member

    Location:
    Cardiff
    the apprentice is sitting his am2 and question is on his 3 phase motor which is 5.5kw what is the over current he dont deal with 3 phase what's quickest way to explain to work it out
     
  2. Pete999
    Offline

    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Are you asking what current a 5.5KW would take? you should be able to help him there Scott.
     
  3. Scott48
    Offline

    Scott48 EF Member

    Location:
    Cardiff
    No the current per phase is obvious but there asking over current which if i remember is the current x 1.5 ?
     
  4. Pete999
    Offline

    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
  5. Pete999
    Offline

    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
  6. DavidSpark
    Offline

    DavidSpark Regular EF Member

    Location:
    Glasgow
    Hopefully this will help.

    1504614265827393055511.jpg
     
  7. DPG
    Offline

    DPG Electrician's Arms

    Location:
    S Yorkshire
    The typo in the title doesn't inspire much confidence in that document.
     
    • Agree Agree x 2
    • Funny Funny x 1
  8. DavidSpark
    Offline

    DavidSpark Regular EF Member

    Location:
    Glasgow
    Never even noticed that haha! Thankfully it wasn't me who typed it up, but I think the theory behind it is sound enough.
     
    • Like Like x 2
  9. Lucien Nunes
    Offline

    Lucien Nunes Mercury Arc Rectifier Trusted Advisor

    Location:
    London
    Anybody care to guess which P they think they mean?
     
  10. Rob
    Offline

    Rob Trusted Advisor

    Location:
    North west
    Not sure why setting the overload +10% is still being taught.

    That's not been applicable for a long while.
     
  11. DavidSpark
    Offline

    DavidSpark Regular EF Member

    Location:
    Glasgow
    I'm sure they mean part P. Everyone knows I x V x p.f. = part P
     
    • Funny Funny x 1
  12. davesparks
    Offline

    davesparks Trusted Advisor

    Location:
    guildford
    set it to the flc as detailed on the motor rating plate.
     
    • Agree Agree x 3
  13. Lucien Nunes
    Offline

    Lucien Nunes Mercury Arc Rectifier Trusted Advisor

    Location:
    London
    I think the trick here is that they aren't given the flc for the test, only the motor power rating (it's not a real motor IIRC, just a terminal box). But on the basis of post #6 the power quoted is not given as normal on a motor (output power) but the electrical input power. Or whoever wrote that suspect-looking page was even more barking.
     
  14. Pete999
    Offline

    Pete999 Trusted Advisor

    Top Poster Of Month

    Location:
    Northampton
    Pete999?
     
Loading...
Similar Threads - phase motor current Forum Date
NVQ3 2356, three phase question Electrical Courses & Electrical NVQ's Friday at 6:40 PM
Method to install 19.6KW oven in single phase property Electrical Wiring, Theories and Regulations Sep 9, 2017

Share This Page

  • Electricians Directory Post a Domestic Job Post a Commercial Job