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Type: Posts; User: templdl

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  1. Replies
    29$$
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    738

    Also remember that a transformer is not a voltage...

    Also remember that a transformer is not a voltage regulator. The secondary voltage is dependent upon what the voltage is at the primary at any given point in time.
  2. Replies
    29$$
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    738

    Yes, you we could nbe able to come close to 400v...

    Yes, you we could nbe able to come close to 400v with a 380v secondary by using the -(2) or (4) 2-1/2% FCBN taps that are most likely available on the 480v primary which you could use to raise the...
  3. Replies
    10$$
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    584

    All said please don't overlook the application of...

    All said please don't overlook the application of NEC art. 240.6(B)Adjustable trip breakers.
  4. Thread: Main breaker

    by templdl
    Replies
    8$$
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    470

    Here are my thoughts: I am understanding that...

    Here are my thoughts:
    I am understanding that your reading have been taken from the load side. If so check the voltage from the line side to the load side of each pole. You shoukd read basically...
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    4$$
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    236

    How did you come up with 120/208 which I would...

    How did you come up with 120/208 which I would 'assume' would be be 1ph3w which would be feed from a 3ph 480d - 208y/120 step down transformer? Now this is only a guess as you weren't clear on this....
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    17$$
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    611

    As long as branch circuit protection is provided...

    As long as branch circuit protection is provided first then you may consider additional protection as supplimentery protection as I understand it. Look up reference to supplimentery protection in the...
  7. Replies
    7$$
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    271

    Yes, machine tool transformers are designed for...

    Yes, machine tool transformers are designed for such loads as the secondary winding ratio is compensated to allow for this type of load unlike the common GP transformer. If I can recall I believe...
  8. Replies
    3$$
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    200

    Have you given it some thought that the generator...

    Have you given it some thought that the generator must be able capable of putting out enough overcurrent tyo trip a breasker thermally as well as enough short circuit current to trip a breaker...
  9. Replies
    4$$
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    293

    MCPs are magnetic only devices of course with no...

    MCPs are magnetic only devices of course with no thermal protection. They realy don't "protect" motors at all. If one does trip it is as a result of a failing motor. They do two things, as a motor...
  10. Replies
    6$$
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    307

    Interesting that you omitted the kva rating of...

    Interesting that you omitted the kva rating
    of the transformer though.
    There is no issue with using a transformer to step up but depending upon the va rating you may not like the results as the HV...
  11. Replies
    7$$
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    491

    Ireread your post a number on the times and the...

    Ireread your post a number on the times and the secondary. Voltage rating of the transformed appears to be missing.
    From the numbers non the subsequent posts one is led to believe that it may be a...
  12. Replies
    23$$
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    679

    Yes, should the OP include all the necessary...

    Yes, should the OP include all the necessary information most question could be addressed in a reply or two.
    But, it's a lot more fun the guess and to make assumptions on what the OP is trying to...
  13. Replies
    23$$
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    679

    Exactly. To my point of my previous post.

    Exactly. To my point of my previous post.
  14. Replies
    2$$
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    211

    All circuit breakers are current limiting to some...

    All circuit breakers are current limiting to some degree which is why when the proper testing is done series- combination protection can be achieved.
    But there are specific requirements for breakers...
  15. Replies
    23$$
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    679

    Have you considered Art 450 table 450.3(A)?...

    Have you considered Art 450 table 450.3(A)?
    Also, why did you omit the KVA rating of the transformer in your post?
  16. I agree with you that a loose connection are more...

    I agree with you that a loose connection are more apt to have caused the failure. However It should be given some consideration that the heating and cooling of the undersized wire may have resulted...
  17. Replies
    8$$
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    221

    It is actually is not 600vac to 250vdc but up to...

    It is actually is not 600vac to 250vdc but up to 600 vac for an AC voltage or up to 250vdc for a DC voltage.
    As the others have said you are covered.
  18. Replies
    1$$
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    205

    They may be hard to liquidate because they are...

    They may be hard to liquidate because they are often specified for the application. If you do get lucky whoever buys them may sit on them for a while before they find a buyer. This should give you a...
  19. Replies
    12$$
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    640

    As I recall while working as a sales and engineer...

    As I recall while working as a sales and engineer for a transformer manufacture you could design said transformer as a boost but there ended up to be very little cost advantage as one would expect to...
  20. Would you agree that a neutral is a load,...

    Would you agree that a neutral is a load, current, carrying conductor where a grounding conductor is not nor intended to be. The simple idea that an EGC is capable of carryng load current is a...
  21. I believe that you will find that the device is...

    I believe that you will find that the device is UL 489 listed device. As such I must meet the testing requirements of a UL489 listed device.
  22. Replies
    12$$
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    640

    Yes, the problem is stepping up about 100v which...

    Yes, the problem is stepping up about 100v which is not practical to do with as boost transformer configuration. You may as well use a two winding isolation transformer.
  23. Replies
    6$$
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    433

    Thanks. Something that I was never aware of...

    Thanks. Something that I was never aware of especially by Ford himself.
  24. A 1200a frame with an 800a NIT unit or a...

    A 1200a frame with an 800a NIT unit or a nonadjustable trip unit? It is obvious that you can't change the rating of the other quipment. Is there an issue with feeding a 1200a rated piece of equipment...
  25. Wouldn't one consider a breaker that is...

    Wouldn't one consider a breaker that is classified as having a NIT or non interchangeable trip unit and not adjustable? As such it would require a qualified person to change the trip unit rating.
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