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  1. Replies
    9$$
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    451

    Auto reclosing. And in some cases rewiring...

    Auto reclosing.


    And in some cases rewiring of the system after lockout (reclose attempts made and none of them held):


    https://www.youtube.com/watch?v=2VGs7FdrSIE
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    15$$
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    544

    Just don't tell certain folks, it will give them...

    Just don't tell certain folks, it will give them ideas :lol::rant:
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    15$$
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    544

    Would it even have a waveform?

    Would it even have a waveform?
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    15$$
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    544

    The question IMHO is- was that parallel arc more...

    The question IMHO is- was that parallel arc more than 75 amps or as a series arc greater then 5 amps?
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    112$$
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    4,039

    This being what determines the two being bonded...

    This being what determines the two being bonded together vs not bonded together:

    .
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    112$$
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    4,039

    What neutral switching scheme :? I'm asking...

    What neutral switching scheme :?


    I'm asking you to use this chart on a 5 cycle clearing MGN system:

    ...
  7. Replies
    112$$
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    4,039

    Remember, I just said you can show me the results...

    Remember, I just said you can show me the results at 5 cycles. Lets first determine if 5 cycles is ok or not ok.



    I have always been taught to take BF into account. I normally bite my tongue,...
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    112$$
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    4,039

    Page 4: ...

    Page 4:

    https://www.scientificbulletin.upb.ro/rev_docs_arhiva/full628_442581.pdf

    We have a voltage of 2.4kv

    5 cycles 10 cycles 15 cycles.

    Where do the values land on the physiology graph?
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    15$$
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    544

    I agree, great replies thanks guys :)

    I agree, great replies thanks guys :)
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    15$$
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    544

    Would an arc fault trip on this?

    Keyless lamp holder with an actual arc fault. Not from a loose connection but it appears some yellow water got inside of it. Would this lead to a fire? Or trip a regular AFCI?


    ...
  11. Replies
    112$$
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    4,039

    Prove to me that even with functioning equipment...

    Prove to me that even with functioning equipment 5 cycles of 2.4kv will not hurt someone. Calculate the body resistance, the current that will flow and check in relation to the IEC graph.




    ...
  12. Replies
    19$$
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    852

    Not code complaint, but may be necessary. ...

    Not code complaint, but may be necessary.


    Before you pull them permanently see if the circuit holds with a regular GFCI.
  13. Replies
    112$$
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    4,039

    This is good, but its difficult to do with tens...

    This is good, but its difficult to do with tens of thousands of breakers every few years. Especially when for some you need to schedule an outage (straight bus).



    With multiple reclosers in...
  14. Replies
    29$$
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    1,539

    I think you are right. Its probably the max frame...

    I think you are right. Its probably the max frame size for 63 amps.


    Keep in mind off brand Chinese products are 1 part translation fail 1 part playing by their own rules.
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    29$$
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    1,539

    I'm guessing model number. Most of them say "63"...

    I'm guessing model number. Most of them say "63" in the part number despite the amps being different:

    ...
  16. Replies
    112$$
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    4,039

    I still assert that its "normal" for a 3 cycle...

    I still assert that its "normal" for a 3 cycle breaker to clock in at 5 cycles. Let alone an oil unit.

    Here is a relaying engineer saying the same thing toward the end of a thread:



    ...
  17. Replies
    29$$
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    1,539

    25 amp, C trip curve.

    25 amp, C trip curve.
  18. Replies
    112$$
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    4,039

    Its not malfunctioning. Its been documented in...

    Its not malfunctioning. Its been documented in event data. Even in stability reports its assumed 2 extra cycles for a 3 cycle breaker and 1.5 extra cycles for a 2 cycle breaker. PJM, ISO-NE, Ercot,...
  19. Replies
    112$$
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    4,039

    An SPS2 breaker on its best day clears in 3...

    An SPS2 breaker on its best day clears in 3 cycles page 15:

    https://w3.usa.siemens.com/smartgrid/us/en/events/Documents/IEEE%202016/HP_SiemensCircuitBreakerFamily.pdf


    A breaker that hasn't...
  20. Replies
    20$$
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    1,046

    Mag only. These wind up in installations over...

    Mag only.

    These wind up in installations over seas. But you are correct, these might not trip even at 3000amps :lol:

    I ask because I've taken apart a 1 inch Crouse Hinds resi breakers that...
  21. Replies
    29$$
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    1,539

    6,000amps is the interrupting ratting. The...

    6,000amps is the interrupting ratting.


    The breaker is rated for 50Hz yes, but in reality it does not matter much.


    NEC is not concerned with what gets plugged into the wall.


    And...
  22. Replies
    20$$
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    1,046

    Would you say these start to trip at 300-500%? ...

    Would you say these start to trip at 300-500%?


    https://www.amazon.com/gp/product/B07M6KKQPB/ref=ox_sc_saved_title_5?smid=A36IYZXRPHYKF1&psc=1

    ...
  23. Replies
    112$$
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    4,039

    Show me what part of the NESC mandates that an...

    Show me what part of the NESC mandates that an MGN system or any particular system must clear in 2-8 cycles.






    You know the theory which I am referring to. Limit the neutral current, you...
  24. Replies
    29$$
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    1,539

    Appears so :happyyes::happyyes::rotflmao: ...

    Appears so :happyyes::happyyes::rotflmao:





    Good point- but I'd imagine (hoping) they took that into account with the 60Hz listing.
  25. Replies
    112$$
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    4,039

    Not if all loads are connected in delta and your...

    Not if all loads are connected in delta and your zero sequence is set very low.
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