Recent content by Justin91

  1. J

    Single phase supply

    old motors are connected for 480v supply but the supply was 240v and they have been running continuously for many years like that and I guess that’s why the old motors have damaged windings and lamination. New 240v motors are installed and all good.
  2. J

    Single phase supply

    appreciate the offer but I’m in Newcastle might be a bit out of your way, and thanks for all the information i am learning more and more as I look into it. I’m going back to the site in a few days and will post how everything goes.
  3. J

    Single phase supply

    it was driving a fan not heavy at all for a ventilation system and yes I was sent there because it was not drawing the air it should, The connections where changed I believe and run with 240v and still had low torque then pulled apart by a motor rewind shop and apparently laminations are no good.
  4. J

    Single phase supply

    thank you for all this information and your sketch it is very useful to me and I am returning to the site in a few days to investigate. I am under the impression yes it is wired for 480v but 240v has been connected and run on this motor for its life time, if this is the case what would the down...
  5. J

    Single phase supply

    I’m with you and I’m pretty certain it’s just 240v supplies the motor and my boss is making me doubt myself and I’m hoping I am right and I get to prove him wrong. And yes it’s a town supply in a well built up area in a small shopping centre. But thank you for telling me how 480v is achieved for...
  6. J

    Single phase supply

    Even is it is 480v supply so be it, I’m more curious to learn how you get 480V in single phase active, neutral and earth, a step up transformer maybe? Note the building does have 3 phase but 3 phase cable is not running to the motor.
  7. J

    Single phase supply

    100% with you on that unfortunately my boss makes me do heaps of stuff I know I shouldn’t be doing I pretty much rely on advice and out of work training.
  8. J

    Single phase supply

    My only concern is I isolated and disconnected in a hurry and had to order a new motor and order a single phase 240v motor assuming the supply was 240v, now my boss is saying it’s configured for 480v supply and asking if I’m sure the supply was 240v.
  9. J

    Single phase supply

    There would be three wires in either case. If it is 240V, they will be active, neutral and earth. On a standard split-phase 480V system there would be two actives and earth, with no connection to the neutral. You can usually identify which voltage the motor is set up for, by comparing the...
  10. J

    Single phase supply

    If I have a 240/480 volt dual voltage single phase motor connected by 2.5mm 2c+e to an isolator and then just 1mm flex coming out with active, neutral and earth connected is it possible the power supply to be 480v or is it most definitely 240v

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