3 phase

  1. W

    USA 3 phase conversion to 110 in residential USA

    Moved into remote residential site in USA , devestated 3 years ago by tornado that took house, family and all buildings, poles etc. except well building and barn (where I am living for now) only remaining service is a 3 phase that went to well. For about 6-10 months I need to survive here till I...
  2. A

    3 phase supply in a 3 bed detached rural house

    If I install a new TPN system at home can I run x3 100amp Supplies from It, so I have x3 100amp Consumer units, 1 existing & 2 new ?.
  3. R

    USA ungrounded 3 phase systems

    hello. looking for advice on working on a 3 ph, 3 wire 480 delta that i believe fits the definition of a corner grounded delta. the title of the thread is appropriate because theres only 3 wires marked for each phase and no neutral going into the customers main disconnect switch which powers a...
  4. N

    3 Phase Inverter Motor Vibration But Not Spin

    Dear All, My tool Carousel crashed last night and when I tried to initialize the Carousel, the Motor just vibrating (shake hard) but not spin. I am not sure if Break, Encoder or Resolver cause the issue. Please advise. Thanks, David
  5. N

    3 phase conversion on Car Ramp

    Hi All I am new on here and looking for some advice on converting a car ramp to single phase. This particular ramp is sold in 2 versions single or 3 phase. I bought a 2nd hand 3 phase version at very handy money so can justify a bit of spend on it. The 3 phase version i have has a 2.6KW 4 pole...
  6. P

    What is 3 phase bridge rectifier circuit?

    5 bridge rectifier circuit diagram ?????? 1. Three phase bridge rectifier circuit with resistive load 2. Rectifier circuit with RL load 3. Rectifier circuit with RLE Load 4. 3 phase rectifier bridge circuit using filter capacitor 5. Controlled rectifier circuit Link post...
  7. BiddeldyBwah

    Do 3 phase boards usually have RCD protection in commercial settings?

    Just sat contemplating life and realised i don't think i've ever seen any RCD protection on the boards we maintain/install at work. I've seen 300mA protection on some section boards but don't recall ever clocking a 30mA in a 3 phase board. Am i just not looking properly?
  8. N

    3 phase AC motor to a 120V speed controller

    I have a 3 phase AC motor that I have hooked up in low voltage it is supposed to connect to a 120v input 3phase 230v output speed controller I just don’t know how to hook it up. I think I have it right and will post some pictures down below but I would like to double check before I plug it in.
  9. Gunarosid

    3 phase power calculations.

    Dear all.. May be some body can help me to explain what happened with my generator set module. At my attach picture. According to S2 = P2 + Q2 is not correct. Can some body explain it.
  10. T

    3 phase motor reversing itself

    Hi I have a 3 phase 400v motor wired in star configuration it is controlled via a 3 pole 415v coil contactor which is switched simply via a stay put stop ... In for off Out for run.. ( Spanish design ) there is also a single phase fan connected between one phase and the star point of the motor...
  11. HappyHippyDad

    When does 3 phase supply become 230V in domestic consumer unit?

    I went along this morning to quote for an EVCP install. I thought it was a domestic house but it was a B@B. It has a 3 phase supply. I always pass on commercial or 3 phase as it is outside of my remit. However, I am toying with the idea of fitting this EVCP IF I can fit it from a single phase...
  12. The apprentice

    Testing 3 phase (r1+r2)

    Hi there thanks for helping if you do, but was wondering on testing r1+r2 on a 3 phase distribution board could I link out L1,L2,L3 to earth and there for take all my reading that way ?
  13. E

    Any good resources/videos for 3 phase or industrial stuff?

    I've been watching Residual Current on youtube (great vids and great bloke btw) and really love watching the more industrial/commercial side of things. Are there any resources that teach how 3 phase works? Even college syllabuses seem to be very light on 3 phase stuff. How do people learn this...
  14. P

    Sizing and renting a 3 phase generator in Wales (in the UK)

    Hello everyone, I really hope this isn't an idiot question but boy, I'm out of my depth! I've spent about 3 weeks (not solid mind) trying to work out how to size a generator to power a lathe for a test. Situation is, I'm buying a house in Wales (UK) with a restored lathe in it. It's 3 phase...
  15. G

    3 Phase Advice

    Hi All I haven't done any 3 Phase work for some time but I have just been asked to wire up a new woodworking workshop. There will be 6 - 7, 3 pahse machines all ballanced load machines (4 pin plugs, 3 ph & e) 3 - 4 single phase machines, 2 x 32A ring socket cicuits and a couple of lighting...
  16. G

    New 3 phase supply

    I am in the middle of installing a new 3 phase system for a small bakery production area, new building, 200 KVA supply in total. 200 TP for workshop plus 4 separate 60 amp single phase supplies for new flats above new workshop building. Checking with UK Power Networks they inform me that the...
  17. F

    3 phase compressor DOL wiring

    Hello. I bought an old three phase compressor but it has come without a starter switch. Just five cables, two for the pressure switch and three for the three phases. I have a DOL starter switch, but I don't know how to wire it to make the compressor come on and off with the pressure switch...
  18. J

    3 Phase Socket in Refrigerated Area

    I have been asked to fit a 3 Phase 32 amp socket in a refrigerated area thats under construction. The cables will be on the walls and then a lining company is to come in and install 100mm thick panels 30mm from the wall all over to create a insulated box. inside the unit. The panel guys will...
  19. timhoward

    Practical question about 3 phase IR testing

    Regarding 3 phase IR tests for initial verification, I'm wondering how people actually do it efficiently. GN3 says to IR test between all phase permutations, then: L1+L2+L3 connected together to N L1+L2+L3 connected together to E N to E The OSG further comments that if the group test to earth...
  20. L

    Modification of 3 phase board

    Hello, wanting to install a new (old) MCCB in an Dorman Smith Loadline board, found a couple online, however, the client ordering the works is not keen on installing old breakers, so they would rather us connect tails onto the busbar stubs where the breaker would usually be, fashion some kind of...

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