phase

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  1. Calebp43

    Neutral current in a single phase installation confusion

    In a 3 phase system the neutral carries current that is unbalanced. Okay. So in a single phase domestic household the neutral carries the same current as the live otherwise the RCD will trip. So does that mean if we have a perfectly balanced 3 phase system then if I go to one of the phases and...
  2. D

    3 phase run of 1300 feet

    Hello all. I am trying to get 125 amps 3 phase back to a paintball field to power an electric air compressor. I have a 3 phase 120/240v PG and E feed, 200A panel about 1300' feet away from the desired location. I have 2 transformers, so we can transform up to 480 to make the 1300' run, and...
  3. H

    3 phase motor cable size

    Hi all, I’ve been asked to run a cable for a 3 phase DC motor. Not having much experience with motors would you work out cable sizing the same? In the picture attached are the details I have received. Any help would be great 
    • Hereforhelp
    • Thread
    • 3 phase cable cable size motor phase size
    • Replies: 11
    • Forum: UK Electrical Forum
  4. S

    Powering single phase motor from 3 phases

    Hi, this might be an easy question, but i need to power a single phase motor situated about 300 meters away from my MCC. Do I just run 3 phases 415VAC cable to the motor in the field and just connect one live phase and the neutral to get the 240VAC? if that's the case then what do I need to do...
    • Satrio88
    • Thread
    • motor phase phases powering single single phase
    • Replies: 6
    • Forum: The Welcome Forum
  5. J

    3 phase load balancing

    Hi all, just looking for an outside opinion on this. A collegue and I are going to be installing 4 three phase EV chargers on a site. He's of the opinion that we will need to invert the phase at each charger in order to balance the load, i dont believe this is correct as equipment with 3 phase...
  6. K

    Direct Buried Cables 3 Phase

    Hi, I am a mechanical engineer tasked with some electrical engineering scope of work and not sure where to look for information on the following... I have 12 x Off 95mm2 SWA 3 Phase cables coming from Solar inverters into an energy building panel. Each cable is carrying a maximum of 160Amps...
    • KB1974
    • Thread
    • 3 phase buried cables direct phase
    • Replies: 6
    • Forum: Electrician Forum
  7. timhoward

    Compact 3 phase distribution?

    I may be seeking the holy grail here, but does anyone have any instant thoughts for a compact 3 phase distribution board that doesn't cost the earth? I only need 1 outgoing 3 phase distribution circuit and 1 single phase final circuit, with an 100ma RCD main switch. This is all outdoors with...
  8. E

    Purpose of 110V 3 phase?

    Hi, I have taken over a design engineering job for industry. The design is using a 400V/110V transformer. Usually, the 110V is single phase. However, in this case it is giving 110V 3 phase 32A. The 110v 3 phase is for use with 4P 110V socket to run a pump. Being in the UK, I am used to...
  9. Z

    Three phase motor (two speed switch)

    Hi, I am trying to wire a two speed switch to a three phase motor. I have continuity checked the switch in both positions 1 - Low and 2 -High (See attached) Can someone confirm if this is correct and would this change the speed. Secondly i have a cable coming from what is I assume from the delta...
    • zac211277
    • Thread
    • motor phase speed switch three three phase
    • Replies: 1
    • Forum: UK Electrical Forum
  10. Y

    3 phase generator help

    Iv been asked to wire a separator (portable to go to different farms and separate water from slurry) to a 3phase 40 kva generator. The separator has 3 motors 11hp, 5.5 hp and 3hp. The 11hp motor kept tripping the gennys mcb so a previous spark fitted an adaptable box with contactors so it now...
  11. Khanzada

    Load calculations on three phase board

    Costumer have 12 flats and need to feed for each flat a prepaid meter and consumer unit within the flat , the main supply to building is three phase , my question is how to distribute the load for 12 flats, each flat have a load of 63A. Main supply is three phase .
  12. F

    3 phase meter question

    Hoping to get some info on 3 phase meters. Family has a place out in the country. It needs to get the meter replaced, but seemingly it's a 3 phase meter. Scottish Power has organised this but have cancelled the job as none are available. So my question is, could the job not be done with an...
  13. Z

    Wiring diagram for 3 phase contactor start up

    Hi all, I have two three phase sanding machines that both have there own contactor start up. Both work fine. I have connected a dust extractor to them both. That also has its own contactor start up ad works fine. Its also 3 phase. How can I wire the the extractor to be triggered by either...
    • Zhevster
    • Thread
    • 3 phase contactor diagram phase start three phase wiring wiring diagram
    • Replies: 1
    • Forum: UK Electrical Forum
  14. F

    Single phase motor reversing with brake and centrifugal switch

    Hi guys, Been given a motor and associated control gear within a panel that has been water damaged. This motor has 3 windings U1/U2, V1/V2 and Z1/Z2, 1 pair of wires for the brake and 1 for cut-out I believe. In the process of wiring a new panel up for it and it know its a long shot but can...
    • Factoryspark
    • Thread
    • motor phase reverse single single phase switch
    • Replies: 2
    • Forum: Electrician Forum
  15. N

    Bode Plots: Phase Angle is asymptotic to -180. What is the gain margin?

    What would be my gain margin if my phase angle doesn't cross -180? Thanks in advance
  16. S

    ac single phase motor won't rotate even by hand

    hello!! hope anybody can help me. I have an AC single phase 220v 1.5HP motor that won't rotate when plugged in even when I try to do it by hand, it is kind of magnetically locked, and just hums. when unplugged, it rotates easily. I tested it with a new capacitor that I'm 100% sure is OK (I took...
  17. B

    PAT Testing 3 phase to 13amp adapter leads

    Hi Hope anyone can help Can someone give me advice on how to connect up a 3 phase to 13amp adaptor lead for carrying out PAT testing on 3 phase equipment but using a 13amp port on the PAT tester. Need to know the connections for 4 pin 3phase & earth plug to 13amp plug 5 pin 3phase &...
  18. B

    EV charger on split phase?

    I have a single 7kW EV charger that serves three holiday cottage. The supply to it is E7, with the night rate currently at exactly half the day rate, so most users charge at night, controlling the charge from apps. on their 'phones. Batteries are getting bigger, so it's becoming difficult to get...
  19. M

    single phase motor reversing itself

    evening all ive got a single phase AC fan motor running normally however occasionally on start up it starts in reverse. i have 4 no fans, and this is happening to 2 occasionally. now these are in a fresh air chambers and i was starting to think that the airs blowing over the fans causing reverse...
  20. S

    Three phase motor ( Power cable faulty phase )

    Hi gentlemen, I have three phase motor has an issue. This motor is star connection. When I just disconnect the power cable coming from MCC through breaker, and did megger test I found the reading as follows: Phase1 with ground = 0.17 MOhm Phase 2 with ground = 250 Mohm Phase 3 with ground =...

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