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Type: Posts; User: Sahib

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  1. Replies
    3$$
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    529

    gar I think the earlier version of electronic...

    gar
    I think the earlier version of electronic circuit breaker had some sensing problem.......
  2. Replies
    22$$
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    1,568

    Yes, more details are required: if manufacturer...

    Yes, more details are required: if manufacturer used energy efficient compressor motor, kW/ton of the motor would be less than 1kW/ton.
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    22$$
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    1,568

    An air conditioner not only removes heat from...

    An air conditioner not only removes heat from conditioned space and discharges into atmosphere through condenser, but also does so for the heat of compression of the refrigerant by the compressor...
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    22$$
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    1,568

    That includes both heat per second extracted from...

    That includes both heat per second extracted from space being cooled and work done per second by the refrigeration compression motor! The OP wants only the latter part, which is nearly equal to 1...
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    14$$
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    1,257

    Hmm. What type of fuse? Examined fuse holder?

    Hmm. What type of fuse? Examined fuse holder?
  6. Replies
    14$$
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    1,257

    Since there is no more repetition of the problem,...

    Since there is no more repetition of the problem, it may be concluded fuse was the problem.:)
  7. Replies
    14$$
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    1,257

    Maybe ferroresonance occurring. Are PT's lightly...

    Maybe ferroresonance occurring. Are PT's lightly loaded? Any MV VCB switching taking place also?
  8. Replies
    28$$
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    1,887

    Once you provide it, it becomes their property...

    Once you provide it, it becomes their property and they would maintain it as the 1000 KVA transformer is theirs and so not covered by NEC. Isn't it?
  9. For (outdoor) diesel tank, code is there for...

    For (outdoor) diesel tank, code is there for placement of fire extinguisher. For diesel generator, it is simply stated to keep near fire extinguisher in one installation manual.
  10. Replies
    14$$
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    1,257

    Ratio test on the PT would reveal any inter-turn...

    Ratio test on the PT would reveal any inter-turn shorts.
  11. Replies
    35$$
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    2,894

    NEC requirements for air conditioners (other than...

    NEC requirements for air conditioners (other than room air conditioners) and chillers are same. So the article about air conditioners is also about chillers.


    The calculations in the article are...
  12. Replies
    14$$
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    1,257

    Check insulation resistance of PT with a meggar...

    Check insulation resistance of PT with a meggar and also its historic insulation resistance tests to ascertain any trending.
  13. Replies
    35$$
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    2,894

    Sorry, it is not clear how the article is not...

    Sorry, it is not clear how the article is not applicable to ''chillers''.



    UL or other third party certifying agency would test such a product design anyway for any danger to life and property....
  14. Replies
    11$$
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    1,438

    Are you thinking about time delay fuses?

    Are you thinking about time delay fuses?
  15. Replies
    35$$
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    2,894

    Thanks for your response. I wonder whether i)NEC...

    Thanks for your response. I wonder whether i)NEC distinguishes between air conditioner and chiller and ii)UL or third party certifying authority would pass a product design also based on this article...
  16. Replies
    35$$
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    2,894

    Please clarify, if possible. ...

    Please clarify, if possible. That is AHJ's call.
  17. Replies
    35$$
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    2,894

    I do not believe the article in my last post is...

    I do not believe the article in my last post is against the intent of NEC or is not on topic.
  18. Replies
    20$$
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    1,802

    If soft starting feature is present in the unit,...

    If soft starting feature is present in the unit, it does not matter.
  19. Replies
    35$$
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    2,894

    My only reference is this article: ...

    My only reference is this article:

    https://www.apc.com/salestools/KSIH-6Y6UU5/KSIH-6Y6UU5_R0_EN.pdf
  20. Replies
    20$$
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    1,802

    But per HVAC tech, no problem with the unit....

    But per HVAC tech, no problem with the unit. Perhaps replacing the breaker may help.
  21. Replies
    35$$
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    2,894

    Chiller may be direct expansion or water cooled...

    Chiller may be direct expansion or water cooled type and in the latter case MCA calculation is different.
  22. Replies
    28$$
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    2,032

    Thanks for your response, gar. I still have the...

    Thanks for your response, gar. I still have the impression that you considered only magnetic trip only 20 A CB, leaving out thermal-magnetic 20A CB. Supposing a 20 A thermal-magnetic CB is present,...
  23. Replies
    35$$
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    2,894

    VFD would have soft start and also it would not...

    VFD would have soft start and also it would not allow current increase due to aging. As such, MCA/MOP calculation without taking it into account is overkill.
  24. Replies
    28$$
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    2,032

    That 40A current is not short circuit current...

    That 40A current is not short circuit current (even though it results from a short) but overload current due to considerable resistance in the circuit and so your conclusion that #12 copper wire is...
  25. Replies
    28$$
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    2,032

    For long circuits such as 1000ft as stated by gar...

    For long circuits such as 1000ft as stated by gar only thermal trip ie overload element of CB would operate and not the magnetic element of the CB for a short at the end of the circuit due to...
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