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  1. Thread: 60A 3-phase GFCI

    by Jraef
    Replies
    30$$
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    516

    Call your banker, you'll need a second mortgage...

    Call your banker, you'll need a second mortgage...
  2. Pay attention to the fact that this was...

    Pay attention to the fact that this was Washington State where it rains a LOT, even this time of year. Of the 12 years I lived there, it was raining during 8 of the July 4th celebrations. So the line...
  3. Thread: 60A 3-phase GFCI

    by Jraef
    Replies
    30$$
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    516

    As it says in the Hubbel document, If the A-D...

    As it says in the Hubbel document,

    If the A-D device had that, believe me, they would be advertising it, their data sheet only mentions UL-508, which is for industrial controls. It's tough to get...
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    16$$
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    518

    Considering some of the bizarre stuff I've seen...

    Considering some of the bizarre stuff I've seen people get away with when driving around the Tampa Bay Area for the 11 years I worked there, I'm shocked to learn they even have code enforcement... :p...
  5. Thread: 60A 3-phase GFCI

    by Jraef
    Replies
    30$$
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    516

    You can forget all of that AutomationDestruct...

    You can forget all of that AutomationDestruct stuff, those are "Ground Fault relays", but that does NOT make them "GFCIs", GFCI is a specifically defined term and requires a specific UL listing.
    ...
  6. Replies
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    When a VFD is initialized, the DC bus capacitors...

    When a VFD is initialized, the DC bus capacitors must charge up and since they do so almost instantly, the charging current is pulled in at the rate of the available fault current at the drive...
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    Yes, actually that was going to be my other...

    Yes, actually that was going to be my other suggestion, reducing it to Div 2. Thanks for the reminder.
  8. Replies
    11$$
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    Thanks for the input. Hmm, interesting take on...

    Thanks for the input.
    Hmm, interesting take on it, and the existing installation would seem to add credence to your interpretation (although it's not even dust tight now). I'm more inclined to...
  9. Replies
    18$$
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    What he said. Don't leave a contactor in the MCC...

    What he said. Don't leave a contactor in the MCC bucket if you can avoid it, and the breaker in an MCC starter is usually an MCP, so it can't be used to feed the VFD, you will have to change it out...
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    1/2HP condenser... that’s one heck of a wine...

    1/2HP condenser... that’s one heck of a wine cooler!
  11. it tells you right in article 450. The NEC...

    it tells you right in article 450.



    The NEC is concerned with maximums, not minimums (in this case). You can do things at way UNDER their ratings if you so choose.

    BUT, from a practicality...
  12. Replies
    11$$
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    267

    I had actually visited this site back in around...

    I had actually visited this site back in around 1978 in another life and looked at this very same MCC at that time, because they were thinking even back then of replacing it. Like I said, it is not...
  13. Replies
    11$$
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    267

    Really? That would be great if true. But...

    Really? That would be great if true. But everything I see says it must be dust explosion proof for Division 1, aka NEMA type 9. Article 500.7 does say dust proof (which might mean NEMA 12?) is OK for...
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    Yep. And RTFM means Read The Factory Manual...

    Yep. And RTFM means Read The Factory Manual...
  15. Not often. Up until recently, they were not...

    Not often. Up until recently, they were not UL-489 listed (and even now, very few are), so they could only be used as "supplemental" circuit protection, beaning DOWNSTREAM from some other UL-489...
  16. Replies
    11$$
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    267

    Class II environment Motor Control Center?

    I have to replace an ancient MCC in a Class II Division 1 environment (sugar mill). The old one was grandfathered in because I don't think sugar was considered explosive at the time this was...
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    Red Curly Hair? What's wrong with that... :angel:

    Red Curly Hair? What's wrong with that... :angel:
  18. Replies
    8$$
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    219

    Yes, or a PE willing to stake his livelihood on...

    Yes, or a PE willing to stake his livelihood on it...
  19. The issue you are having is in wanting to use...

    The issue you are having is in wanting to use bolt-on breakers.
  20. Thread: Article 830

    by Jraef
    Replies
    7$$
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    150

    I believe this is referencing what's called PoE,...

    I believe this is referencing what's called PoE, Power over Ethernet without actually saying it anywhere (probably for fear of obsolescence down the road if some other network displaces Ethernet). It...
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    They already have a VFD. You can't get better...

    They already have a VFD. You can't get better than that as far as reducing start-up current.


    LibertyEngineering,
    In cases like this where I have had to deal with somewhat extreme limitations...
  22. Replies
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    That definition is a bit too esoteric for my...

    That definition is a bit too esoteric for my taste.

    In the most COMMON interpretation, OA was an earlier ANSI term for the cooling of a transformer NOT being required to have fans to facilitate...
  23. Replies
    16$$
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    332

    Even though the 208V side may be a Wye system...

    Even though the 208V side may be a Wye system feeding the transformer, THAT TRANSFORMER would be connected using the 3 phase conductors only; i.e. do NOT ground the X0 terminal on the 208V side.
    ...
  24. Replies
    8$$
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    219

    No. What I mean is that your servo amplifiers,...

    No. What I mean is that your servo amplifiers, the POWER portion of the servo system, will probably have an SCCR rating by themselves when protected by some specific fuse or breaker. If not, then the...
  25. Replies
    27$$
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    739

    I think you mean LRC, not LRT. Locked Rotor...

    I think you mean LRC, not LRT. Locked Rotor Torque is determined by the motor design and as most motors are Design B, LRT is 150-160% of FLT.
    20594


    LRC is 5-6x FLC, but that's because at...
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