phase

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  1. J

    Phase to Earth fault on a 3 phase motor supply

    I had the 20 amp 3 phase breaker off and was testing for voltage at the motor terminal box. I had nothing between phases but had 230 volts from each phase to earth. Why might this be.
    • Jonathan S
    • Thread
    • 3 phase earth fault motor phase supply
    • Replies: 16
    • Forum: UK Electrical Forum
  2. t01474

    3 phase EV headache!!

    Evening everybody. It’s been a while since I’ve asked for the collective brains advice but this one has really got me stumped. I’ve been asked to install a twin outlet 22kW EV charger at an office. Unfortunately the office is an old doctors surgery (3 storey ex-house, basement , pitched roof...
  3. D

    contactor single phase L3 used as a pilot light

    Using a three phase contactor but in single phase so just live and neatural using L1 and L2 . Is it okay to hook up a pilot light on L3 terminal so when contactor is pulled in L3 becomes engaged hence pilot light turning on. I dont want to know about aux contact because I will be using that for...
  4. D

    3 Phase power keeps on tripping

    Hi Guys any advice on this one will be a major help. Was called out to a loss of power turned up expecting a breaker down as usual but not the case. so here goes the problem- an apartment block with 315 amp incoming fuses feeding 400 amp mccb set to trip at 220. This in turn feeds a rising...
  5. S

    3 phase steam oven conversion

    I have retired from Solar installs and now finally looking to do my retirement project - Daimler V8 2.5. I needed some powder coating done but the cost for a few small items was ridiculous so I got into the DIY side. I found myself a 3 phase commercial steam oven (FINOX) which is massive so well...
  6. P

    2 single phase meters in series

    I maintain the electrical installation for an old building that is converted into flats. The DNO only owns the transformer and we have a single electricity meter for the whole site. All of the switchgear is ours and the flats have submeters that are also ours (the management company that own the...
  7. HappyHippyDad

    Installing a 3 phase rapid EV charger?

    A bit of an embarrassing question. I have a regular customer who I enjoy working for. He has asked me to install an EV rapid charger for his avant loader (electric tractor type thing). I always turn down 3 phase jobs as I don't feel I understand it fully, but I'd like to do this job. I believe...
  8. J

    3 phase board with 250A incomer

    Hi guys, if a 3 phase board is to be installed, with 250A mains. With 8 32A 3 phase sockets, 8 single phase 16A sockets, 2 light circuits and 3 phase 63A socket on it, that exceeds the 250A. I understand you would have to consider diversity factor etc into it but is that still too much or would...
    • Jordansheds88
    • Thread
    • 3 phase board incomer phase
    • Replies: 7
    • Forum: UK Electrical Forum
  9. S

    3 Phase timer switch

    Hi all, This is a great forum, a big thank you to all those that made it possible, I hope you good people can help me: I have a 3 phase 10HP pump that I would like to turn on/off with a timer switch over a weekly program, looking online I can not find much other than some Chinese device...
  10. D

    3 phase isolator switch

    can I use the above isolator switch with single phase 240V wiring. live neutral and earth? its the right designed switch for me and also it is the right current rating.
  11. newfutile

    Strange IR readings on 3 phase board

    I am unable to take global IR readings on a 3 phase consumer unit, i have disconnected the neutral but when i try to measure the meter never settles and eventually times out. i have tried 2 meter/s with same results
  12. B

    single phase to 3 phase

    I have a single phase system that uses 320 amps and 240 volts and I rewire the circuits for 3 phase what size generator would I need and how many amps on each leg
  13. W

    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...
    • wilderness reg
    • Thread
    • 3 phase conversion phase residential screwfix usa
    • Replies: 3
    • Forum: UK Electrical Forum
  14. 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 ?.
  15. R

    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...
  16. B

    2 Phase and neutral supply ??

    Hi All Question regarding 2 phase supplies. Came across this at a farm house, supply is in 3 phase and neutral to the main dist board, then from the 3 phase board at the farm house out to the garage is a 4 core SWA. They have taken 2 phases and neutral from a 63amp double pole MCB at the farm...
  17. D

    Three Phase Power supply

    Greetings I work for a client who has recently negotiated a bigger supply from the supply authority, the client has agreed with Scottish power to have a larger transformer and feeder cable installed, my part of the works is to upgrade the existing switchgear to accomodate for the new supply...
    • dragonspark
    • Thread
    • phase power power supply supply three three phase
    • Replies: 12
    • Forum: UK Electrical Forum
  18. 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...
  19. 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...
  20. B

    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?
    • BiddeldyBwah
    • Thread
    • 3 phase boards commercial phase protection rcd settings usually
    • Replies: 6
    • Forum: Commercial Electrical Advice

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