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Type: Posts; User: templdl

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  1. [QUOTE=Besoeker;1595501] It will be about...

    It will be about inrush when the OCPD is tripped as the transformer is energized. If so how is it addressed?
  2. [QUOTE=Besoeker;1595450]One other point that I...

    [QUOTE=Besoeker;1595450]One other point that I add, and forgive if it has already been covered.
    If the transformer is designed for 480V primary and 208V secondary on load (and most are in my...
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    17$$
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    Is it "over current protection" or "short circuit...

    Is it "over current protection" or "short circuit protection?"
    The primary device I think would be intended to take the transformers of line should either of the transformers fail. As such the only...
  4. I've been in the industry since 1982 and worked...

    I've been in the industry since 1982 and worked for a DTDT manufacturer for 3 years. There is no derasting required in any of my application notes.
    However you will note that the OP does not include...
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    15$$
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    618

    Common faults are line to ground which is picked...

    Common faults are line to ground which is picked up by the 30ma gf element. The AFCI has been designed to detect undesirable in line arcing in a circuit as well as line to nuetral arcing all of which...
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    4$$
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    157

    Remember that the MCP is a reverse UR component...

    Remember that the MCP is a reverse UR component listed device with no "stand alone ratings." It must be used wthe a combination motor starter. MCPs start at 3a continuous, then 7a, 15, 30, 50, 70,...
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    14$$
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    621

    I know that the challenger business was with...

    I know that the challenger business was with Westinghouse for some time where the challenger breakers were nambranded as I recall matter of fact I think the load center was a Bryant 'BR'. Even though...
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    15$$
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    618

    I only wish that this happened 15 years ago while...

    I only wish that this happened 15 years ago while I was a sales and applications engineer for C-H. I knew the AFCI design engineers at that time personally and was privileged to be a BETA test sight....
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    33$$
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    LRA? Plan on 7x the FLA for NEMA design B but you...

    LRA? Plan on 7x the FLA for NEMA design B but you also must consider inrush which may be 13x but that often varies because of the motor design where energy efficient motors could be quite high.
  10. Thread: 800 hp motor

    by templdl
    Replies
    4$$
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    226

    Think about it, what would the FLA be at 480v....

    Think about it, what would the FLA be at 480v. Would it be practical. Even the windings of the motor we would be impractical to wind at best because of the huge wire gauge that would be required....
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    17$$
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    I think this is what my thoughts were, that is...

    I think this is what my thoughts were, that is the ratings of the OCPD and pphase to ground voltages. With a 3ph system where you may have 240v to neutral available since the neutral is commonly...
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    29$$
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    1,315

    Out may not have seen the damage that can be done...

    Out may not have seen the damage that can be done to MCCBs when the weight of the cable on the lugs is sufficient enough to break the breaker molding. Lashing cable can reduce the flexing as a...
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    29$$
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    1,315

    Also, one can't overlook the weight of the...

    Also, one can't overlook the weight of the conductors themselves and the stress that it often places on the terminals which may not be able to support the weight.
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    11$$
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    Is this a question based on curiosity of a real...

    Is this a question based on curiosity of a real application?
    If it is for an actual application it would be appropriate to provide the rating of the transformer in question.
    You could be referring...
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    7$$
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    465

    If the OP was more specific his question could...

    If the OP was more specific his question could have been answered with one reply. But it is a lot mor fun to guess what his application.
    As I implied it is possible to specify an...
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    7$$
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    465

    Interesting. You have not provided any...

    Interesting. You have not provided any information about the breaker and as such an accurate answer can not be provided.
    The answer could be either yes or not which would be dependent upon the...
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    5$$
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    270

    It has been my experience to be suspicious of...

    It has been my experience to be suspicious of what the test of the story is. The history of the sdize of MCCBs has evolved over the years. If you are referring to vintage breakers the 225a breaker...
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    4$$
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    In addition the the insulation voltage rating is...

    In addition the the insulation voltage rating is important.
  19. Thread: XFMR mounting

    by templdl
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    12$$
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    491

    You have provided very little to no information...

    You have provided very little to no information regarding the transformer. How can you expect to get an answer?
    If I were to take a "wild guess" there may be wall mounting brackets available if...
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    20$$
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    772

    Being unfamiliar with the product are you willing...

    Being unfamiliar with the product are you willing to assume the liability for any of the work that you may be doing on it?
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    20$$
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    772

    Even though it is here say then one would opt to...

    Even though it is here say then one would opt to avoid gernerac products or include the additional cost for generac service.
    Being non authorized one would should be concerned about liability.
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    20$$
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    772

    Of course you did contact generac first.

    Of course you did contact generac first.
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    12$$
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    489

    Have you contacted Eaton for a drawing of the...

    Have you contacted Eaton for a drawing of the transformer?. Have you asked Eaton unless you are afraid to get an answer that you don't want to hear.
    A drawing should include a plan view of the...
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    72$$
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    2,580

    Thanks, That is the first thing that I would...

    Thanks,
    That is the first thing that I would sort out.
  25. Replies
    72$$
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    2,580

    Could it be that the current is originating from...

    Could it be that the current is originating from an outside source and seaking your neutral via your ground rod?
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