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Type: Posts; User: Besoeker

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  1. Replies
    4$$
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    211

    Gar is right. All it tells you is VA. The watts...

    Gar is right.
    All it tells you is VA.
    The watts will be the same or less.
    For a simple electric heater they would be the same.
    For an electric motor, the VA will be greater than the watts.
    The...
  2. Replies
    15$$
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    396

    I've done it on some 800kW drives. I used an...

    I've done it on some 800kW drives.
    I used an iron cored transformer that had an air gap.
    Worked fine.
  3. Replies
    10$$
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    288

    Ah, I see. That explains it. We don't get them...

    Ah, I see. That explains it.
    We don't get them with 460V ratings.
  4. Replies
    10$$
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    288

    I've seen it on quite old motors. But none in...

    I've seen it on quite old motors. But none in possibly the past two decades. Or longer.
  5. Replies
    10$$
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    288

    No problem. As I've posted here before, my late...

    No problem. As I've posted here before, my late great friend Tommy was fond of saying, the man who never made a mistake never made anything.

    A little aside.
    He was a great character and quite an...
  6. Replies
    10$$
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    288

    Does the NEC apply to manufacturers? If not,...

    Does the NEC apply to manufacturers?
    If not, won't US motor manufacturers still rate their products in HP?
  7. Replies
    10$$
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    288

    50kW is 67 HP. I think you applied the...

    50kW is 67 HP.
    I think you applied the conversion factor the wrong way round.
  8. Thread: PINK WIRE

    by Besoeker
    Replies
    22$$
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    891

    I win on both counts.......

    I win on both counts.......
  9. Thread: PINK WIRE

    by Besoeker
    Replies
    22$$
    Views
    891

    Following on from PetrosA's post about difficult...

    Following on from PetrosA's post about difficult to identify colours....
    You'all may know that we Brits had to change three phase colours from the primary red, yellow, blue to brown, black, grey...
  10. Replies
    70$$
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    1,864

    Then I shall not gainsay your personal...

    Then I shall not gainsay your personal experiences and perceptions.
  11. Replies
    70$$
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    1,864

    Fairy 'nuff. But suggesting that shock from a...

    Fairy 'nuff.
    But suggesting that shock from a neutral is worse is just plain wrong.
    The potential on it, even if broken and you still call the broken part neutral regardless of disputed validity,...
  12. Replies
    70$$
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    1,864

    Sorta works.....

    Sorta works.....
  13. Replies
    70$$
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    1,864

    And it would have to that side of the break no...

    And it would have to that side of the break no longer connected to neutral. And thus not at neutral potential.
    Debatable whether the shock can be really be called a shock from the neutral...
    Nah,...
  14. Replies
    45$$
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    1,213

    http://books.google.co.uk/books?id=4-Kkj53fWTIC&pg...

    http://books.google.co.uk/books?id=4-Kkj53fWTIC&pg=PA41&lpg=PA41&dq=electric+motor+case+temperature&source=bl&ots=976eilejoD&sig=r983drViLoSjnAjo9weNSjH_KOI&hl=en&sa=X&ei=lu03VPmhG4vbavqrgJAM&ved=0CCM...
  15. Replies
    45$$
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    1,213

    It is not safe to touch. There is no consider...

    It is not safe to touch. There is no consider about it.

    I've been around quite a long time and in quite a few places including USA. From Taiwan to Turkey. Dubai to Durban. Libya to Lyon. Dealt...
  16. Replies
    45$$
    Views
    1,213

    Respectfully disagree. That's close to 100C on...

    Respectfully disagree.
    That's close to 100C on the outside.
    That would pose a danger to personnel.
  17. I agree. I just happen to have a scope that will...

    I agree.
    I just happen to have a scope that will do the calculations and has a coms port so I can download the data to my laptop.
    Possibly a sledgehammer to crack a nut, but if I have it and it...
  18. Volts, amps, and power I suppose is the obvious...

    Volts, amps, and power I suppose is the obvious answer.
    I'd use an oscilloscope to get the phase displacement. But I cart one around in the boot (trunk) of my car.
  19. You need to use RMS values which is what your...

    You need to use RMS values which is what your instruments will most likely give you anyway.
    You can take the average of each of the three phases but if there is any significant unbalance you may...
  20. Replies
    45$$
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    1,213

    Yep. Easier to blame the electrics. I've had a...

    Yep. Easier to blame the electrics.
    I've had a few real gems over the years.
    Recently, it was mechanical vibration. Our drive so we had to investigate.
    Nothing to do with the drive but you have to...
  21. Replies
    19$$
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    704

    I agree. Most computers, monitors, copiers, go...

    I agree. Most computers, monitors, copiers, go into sleep mode if not operated after a period of time.
    And I agree with charlie b.
    It's about being seen to be doing.
    Rather than common sense.
  22. Replies
    45$$
    Views
    1,213

    I agree. In post#2, I mentioned that the current...

    I agree. In post#2, I mentioned that the current was not right for 20hp and the OP responded in post #5 that it was probably 10hp. The 90A starting current at 7.5 tomes FLC would accord with that.
    ...
  23. Or just Tw if you use SI units. W is omega but...

    Or just Tw if you use SI units.
    W is omega but it doesn't work here.
  24. Replies
    5$$
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    267

    Can you provide a drawing? That would make it...

    Can you provide a drawing?
    That would make it easier to offer constructive comments.
  25. Replies
    45$$
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    1,213

    480V, 20HP and 12A don't seem compatible. I'd...

    480V, 20HP and 12A don't seem compatible.
    I'd put it at more like 24A - I know you guys have tables for these things.
    Have you checked what they give for a 20HP motor?
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