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three phase

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  1. P

    Three phase cable size

    Can anyone tl ell me how to work out the size of an existing supply cable. It is a three phase supply into 200A fuses. The cable is buried in concrete ground and so I cannot see any markings on it. I've had a look at the cables upstream of the fuses and they look to be at least twice as larg as...
  2. B

    three phase motor insulation resistance test

    Hi all wondering if you could help clear something up for me. I was recently working on a three phase motor rated for 480volts a.c and wired in delta. So before powering up I done my dead testing and done my insulation resistance test at 500volts d.c which I thought was correct but read up on it...
  3. B

    New three phase motor winding burn out

    We have been involved in the installation of a dust extraction system which is powered by a fairly large 3 phase motor (18A). The motor was pre-wire to a control box on the side of the extraction housing and the star/delta starter was also pre-wired. The only wiring that was required was the 2...
  4. L

    Three phase solar

    Starting a solar three phase project, how do you connect the generation meter from 8 three phase inverters, or will each inverter have it's own g meter? Appreciate a response
  5. sparksburnout

    Problem with PSSC on three phase supply

    I have a domestic premises (it was once a shop) that has a three phase supply, although only one is being used now. I am using a di-log 9083P tester, and when doing a Ze test am getting 23KA as the reading for PSC, with 0.01 ohms as the loop resistance. I am getting a Ze of 0.35 ohms and a PFC...
  6. S

    Three phase

    We run a small meditation centre. One building is economy 7 and the other ordinary supply. We had to change to a three phase supply and one cut out point was installed. We are told we can only have one meter on it and therefore we lose our ability to have economy 7. Can the ryefield box be used...
  7. S

    Three Phase to Single phase Online UPS with a capacity of 15KV

    I want to build a three phase to single phase online UPS with a capacity of 15kv that can hold a backup for 15 minutes. Can anybody provide with specific circuit diagram, technical specification and stepwise instructions to do that? Thank you!
  8. N

    three phase contactor

    Hi Guys, please can someone help with a little problem I have........ please see photos! I would like to add a push switch to bring a motor in to turn over an engine (on a dyno) and I would like to use the contactor pictured but cannot for the life in me make it work , the single breaker appears...
  9. T

    Single to three phase inverter question...

    Hello!! I need to install a 3 phase appliance (3x4kw) but there is only 2 phases in to the property so I was wondering if I could use a converter for that? I have never used one before, only heard about them, could they handle the load? are they reliable? who sells them? etc etc I really...
  10. P

    kVA - Amps Formula for Three Phase

    Hi gents Just wondering if anyone can advise me on my working out. Have been asked to advise on supply conductor csa for a sub distribution supply. The power requirements are 10kVA 400V supply. I'm used to working with kW power just not sure on kVA - Amps formula which I have used below: - I...
  11. D

    Three phase tap off plugs

    Hi all Any body know a good supplier that sells the three phase tap off ( plug in ) units ? such as :- KSE 02CG5 AND KSA 02CG5 ?
  12. D

    Three phase motors

    I'm studying my HNC and I'm struggling a bit with motors, does anybody know much about three phase induction motors Cheers, Davey
  13. D

    Three Phase Board 230V

    Just after people's opinions seen this a few times and although not incorrect still makes me think: Three phase board 8-12 ways usually linked out to run on a single 230V supply. Seen second hand boards converted using bus bar to make in affect a 36 way single phase board. Always have been...
  14. sajeel

    Three phase question

    Hi Just did a three phase consumer unit, tested insulation and continuity before commission tested three phase in correct order. When I switched on it sparked and took out l1 and l2 fuse, incomer has two faulty lock screws at top apart from that any other ideas ?
  15. P

    three phase sequence testing

    Hi guys, as the title suggests just trying to get my head round three phase sequence testing, if I understand it correctly this is confirm that the three phases are in sequence.....obviously :) Now as I understand it this is obviously a live test and a three test leads are connected to L1 L2 L3...
  16. G

    Single phase installation off a three phase cutout and distributors fuse details??

    Hi guys, Just finished a job installing communal lighting and power in 7 blocks of flats, The supply for each building is the same a TNS 3 phase cutout with a feed jumped off one of the phases to the meter and from the meter supplying our single phase CU, the flats are then jumped off various...
  17. R

    Three phase motor

    Good evening, I had to troubleshoot a three phase milling machine earlier. I'm not especially hot of plant like this, but i'm quite confident that the control system is good, but that the motor is faulty, In that when power is applied it pulls the breaker. It's a 1HP 3 phase motor,drawing...
  18. Y

    three phase problem - supply/motors/board?

    Hi all, I'm new here so :flowers: I have a small industrial unit with three phase and single phase installed. The single is obviously for lights, standard sockets, phone, computer etc and is working perfectly. The three phase supplies a tyre changer (10A breaker) and an air compressor (20A...
  19. R

    Economic Advantages and Disadvantages Three Phase Compared to Single System

    What are the economical advantages and disadvantages of using a three phase distribution system compared to a single phase system?
  20. A

    Three phase 4.4kW motor

    Hello there, I want to connect a three phase 4.4kW motor in star/delta and I have wiring diagram, but I want to know what parts exactly need to do it. If anyone can help me, please? Thank in advance

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