three phase | Page 10

three phase

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  1. B

    Three phase current motor 400v

    In a 23 kw three phase motor will each phase have 100a?
  2. G

    Three Phase Fan Units

    What test would you carry out of a three phase fan unit?
  3. D

    Three Phase Question

    Hi I got given a Mock Paper for the Level 2 203 test and got stumped on a question 400v 50Hz 3 phase supply is connected to a star connected balanced load. the voltage is? A.110V B.200V C.400V D.600V Iam not sure if its C or D any help would be much loved Ty
  4. H

    RCD protection on Office socket - Three phase board.

    On a job at the moment and office sockets have no RCD protection. They are ran in singles, PVC conduit. I am adding onto the circuit as additional rooms are in the process of being built. Do I need to protect the whole circuit with an RCD or can I just protect the new sockets with an RCD FCU...
  5. T

    Two Three Phase motors on one Overload

    Hi All I have come across two 3 phase in line WOODS fans rated @ 0.22 kW / 0.6 amps connected together on one overload. This does not seem correct is there anyway this could be right ? Regards Tailspin :shocked::confused:
  6. G

    Help with three phase power

    Hi I need some help with 3 phase wiring. I'm fairly confident I'm right but haven't done it since I was 18. Would I be right in saying that normal 3 phase power for sockets are wired in star and you should end up with 5 cables at each outlet? L1, L2, L3, N & E? With a 3 pole isolator for...
  7. B

    Three Phase Value

    For 230 volts x 1.732, use 398....hi to all my fellow electricians. Kind you explain me what is the 398 answer from the given voltage. Thank you!
  8. C

    i need priceses on three phase instalations

    i am fitting a db board and 16 sockets an lights and emergency lights into a building, can any one help me on pricing the job ???????????????
  9. J

    three phase regs

    Hi I am doing an electrical installer course and have 2 questions that I cannot find the answer to in any of the books. 1) Socket outlets in the same room, connected to different phases should: a. not be connected to earth b. never be permitted c. be labeled 'Warning High Voltage' d. be...
  10. R

    Main switch on Three phase board

    Hi, Changing an old Three phase board in a school today which feed off-peak storage heating and underfloor heating. The supply Is TN-S. The board were fitting in a Crabtree Loadstar, and comes supplied with a three pole isolator. As this is effectivly the main board for the effected...
  11. W

    Three phase meter

    Anybody know where I can get a 3 phase meter from? I'm struggling to find one for next week. Cheers.
  12. D

    MEM 3 three phase Boards

    mem 2 used to have a horizontal connection kit for linking two boards side by side Do you know if MEM 3 has this or have they removed it??
  13. M

    pfc testing on three phase with fluke 1561

    Don't do much three phase and a bit of help would be helpful.On three phase when testing for pfc am I right in saying that I connect the leads to L-N and don't need the earth lead connected. As I'm not sure of putting the meter across all phase, so double the reading that is highest of the three...
  14. L

    Three phase voltage query.

    Hi Guys, Don'tdo that much with 3 phase but have an issue at the moment. Had a 3p motor burn out on a farm elevator. Anyway motor was returned to the reconditioner as it was only about 7 months old and it's NOT in constant use. Reconditioner said 'It's a right mess inside looks like you've...
  15. F

    three phase transformer wiring

    Hello out there. This is a werid one I have never heard off before. Just purchased a pair of 5 ton column lifts so I can work on my pick up. Anyway, i purchased the lifts and was told they was three phase ie 415v. lifts were delivered and they had a 16a 5 pin red plug, no problem i thought...
  16. B

    Single phase to three phase converter?????

    I recently looked at a job where a customer is turning his garage into a workshop and he wanted me to check the electric was satisfactary. The garage is fed by a 2 core 4mm SWA from the house with an earth pin outside the garage and a 4mm earth going to an rcd board. When the customer showed me...
  17. M

    three phase energy saving moudules pumps etc

    hi everyone we have a three phase supply (63 amp hrc fuses) which feeds a star delta motor control panel with interlocking door panel switch contactor. This is operated via a bms (building management system) , boiler control system and the energy saving system is wired in after the delta...
  18. D

    3.68Kw system on three phase

    Hi I am an end user and want a 3.68kW system installed at work. We have three phase but don't have the money to do the full 10kw job. My installer is proposing installing a 3.68kw system and connect to only one phase. He is using an SMA 4000TL and 16x Upsolar 230 panels My concern is...
  19. K

    1.2 kw system and three phase supply

    Next month we are installing a small 1.2 kw system (5 panels I believe), that is all that the roof can fit, but the supply is three phase. Hardly seems worth it, but it's a local authority job and I think it's more of a show home. Any ideas how to go about this, as I presume I would only be...
  20. M

    why you need to balance a three phase systems and what a unbalance load does?

    Hi everyone i'm currently halfway through my cg2330, i wonder if somebody can help me on balance and unbalance load on a 3 phase systems the basics i needs only , they are split into single phases systems i want know about efficiency, running costs, cable and switchgear sizes advantages etc.. thanx

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