single phase | Page 2

single phase

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  1. 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...
  2. 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...
  3. mikeatron

    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...
  4. Peter55

    Earthing question - three phase into main building, then single phase to EV charger

    Hi there, new to the forum and in final stages of completing C&G level 3; need to complete design project to complete. Am struggling to get my head around how to draw up correct circuit diagram showing EF Loop path for EV charger where initial supply is described as 'three phase TNCS' feeding to...
  5. N

    Bringing single phase off three phase board

    Hi all, new to this thread and just looking for some views. I have today attended a industrial unit which is being converted into small individual offices. An electrician has previously been here and has taken 3 individual sub mains from the existing three phase consumer unit to single consumer...
  6. J

    3 phase rotary inverter from single phase.

    My 3 phase cnc lathe is rated at 27 Amps on the manufacturers website. When I mentioned that I want to run from a single phase via a rotary inverter I was told that it will need 27 A per phase therefore 3x27=81 Amps from my single phase. Is this correct? I reckon the machine is about 5hp.
  7. T

    Is there such thing as 4kW, 115VAC , single phase equipment?

    Hi, We are being asked to make a power supply for a Bass amplifier......its 4kW, from 100-265VAC. Does that sound right? Woudlnt 4kW from 115VAC always be done with three phase? (this kit is for mulitple different countries)
  8. i=p/u

    Single phase motor humming and heating up.

    Hi, morning EF. I was looking at a single phase motor yesterday attached to hydraulic pump for cardboard bailing machine that seems to be temerpemental with stop and starting and making humming sound. I checked the contactor was working first and voltage was going to motor, I clamped the cable...
  9. bigspark17

    Ramp up down switch single phase motor

    Weired one. Looking for info or past experiences. Called to a garage very old ramp 40+ yrs old not working. Very old switcc looks like its burnt out, so before i take on finding a replacement i wanted to make sure motor ok. So bypassed up down switch and turned on isolator. (Single phase motor)...
  10. 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...
  11. 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
  12. M

    Configuring motor to run off single phase?

    We have got a hydraulic motor/powerpack for leveling legs of a trailer. However this trailer is running off a 15KW inverter, so the motor needs to run off single phase. The motor has come configured for 3 phase, however the motor plate does say it will run off single phase. Would i be right in...
  13. C

    Any Idea why my single phase motor ans speed controller are not working

    HI Guys, I bought this motor and speed controller used and tried wiring as per the diagram on the side of the speed control unit but the motor will not turn on. I am running it at 220v, when plugged in I do see the green led light up. There is not much info on the internet. But I was able to...
  14. M

    how hot can be a single phase motor ?

    Hello! I have a high-pressure compressor equipped with a single phase motor! The motor have 2 capacitors, 1 continuous and 1 for starting, with a relay for isolation . The motor is old, but it's still working! I have changed the capacitors with new ones and the cable too. The motor work ok! I...
  15. S

    3phase surge suppressor connected to a single phase utility supply.

    I am using a 3 phase 4 wire surge suppressor on a single phase 240V mains. Is it still okay or will it have some back feed impact on the mains system?
  16. M

    Single phase but 2 cable in one fuse

    Hi everyone There is a switch board which is single phase, but when you look at the back you will see 2, 16mm cable go to the fuse(red and white). What is that for ? I haven't seen before. And the black and blue cable goes to the service neutral link !!! In Australia 3 phase color is Red White...
  17. R

    4pole isolator on single phase

    Hi, I have been asked to fit a 32a isolator ready for an air con unit and picked one up from screwfix. Unfortunately the one I have is a 4 pole, can this still be used with 6mm t&e or do I need to replace it with a 2 pole. If it can be used do I just use terminals L1 & T2 Thanks
  18. I

    Appliances in single phase property damaged by 415v

    Got an emergency call out from a very worried old lady the other night - the power at her apartment had gone off and the kitchen light was smouldering badly. She'd been on the phone to the DNO (Northern Powergrid), they were telling her to turn the main switch off but she couldn't understand and...
  19. Riatsila

    UK Is double pole switch necessary in this case?

    Hi all A friend bought an extra control switch for his winch so that he'd have controls at upper and lower levels during building work. His problem was that the new switch was single pole while the switch in the original control unit was double pole (both double throw, centre return). However...
  20. S

    Coffee machine wiring 3 phase on single phase circuit

    This coffee machine is three phase model number sm 105e It’s three phase with 3 brown cables one neutral and earth What is the cheapest way to wire it in? thanks

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