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Type: Posts; User: kwired

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  1. Replies
    19$$
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    397

    Full load current is still the same, but since...

    Full load current is still the same, but since only half volts and half the winding is used result is half kVA.

    Pretty certain %Z on nameplate is going to be for the full winding. You should be...
  2. Replies
    18$$
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    517

    Or any other class 1 control circuit is...

    Or any other class 1 control circuit is acceptable to run in same conduit.

    Good questions. supplemental overcurrent is simple, but can leave you with no power to operate the shunt trip. If you...
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    8$$
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    233

    At one time that was somewhat a general rule that...

    At one time that was somewhat a general rule that you could rely on to some extent. If it didn't require GFCI protection it probably required AFCI protection. But 2014 and 2017 NEC that logic is...
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    5$$
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    177

    Probably more of a formality than anything, they...

    Probably more of a formality than anything, they maybe need such drawing in their files on all services for internal reasons regardless of what it supplies.
  5. Replies
    12$$
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    343

    "Momentary" action OP wants is to hold the button...

    "Momentary" action OP wants is to hold the button while the output is "on" and to turn output "off" when you let off the button.

    Since these are a pretty low pressure actuated item, you need very...
  6. Replies
    11$$
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    427

    There would be no ceiling registers to close off...

    There would be no ceiling registers to close off during heating season if that were the case.

    Oil burning furnaces are about extinct around here, other than waste oil furnaces in shop buildings...
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    9$$
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    210

    Many considerations mentioned are ones that maybe...

    Many considerations mentioned are ones that maybe keep installation cost down.

    Something else to consider is how much of the lighting is down when you turn off a circuit or when one fails (maybe a...
  8. Replies
    19$$
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    397

    Before throwing in additional technicalities for...

    Before throwing in additional technicalities for Gar to pick on, you are only involving half the secondary winding, initial impedance is going to be about half the full winding impedance.

    Note...
  9. Typical three phase induction motor I had been...

    Typical three phase induction motor I had been taught long ago that 10% higher current at 208 volts is pretty typical.

    If this is a single phase motor, that may still be true for a CSCR motor, but...
  10. Replies
    208$$
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    3,776

    AFAIK Square D 2 pole AFCI's do not work on...

    AFAIK Square D 2 pole AFCI's do not work on 120/208 3 wire MWBC's either, so with a 208/120 supply you can not use MWBC's if AFCI protection will be required. Not sure about other's two pole units...
  11. Replies
    14$$
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    320

    Per NEC your service disconnecting means needs to...

    Per NEC your service disconnecting means needs to be readily accessible. If this is intended to be the service disconnecting means, it is not compliant with NEC. If it is not intended to be service...
  12. Replies
    17$$
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    372

    typical alternating relay setup would still run...

    typical alternating relay setup would still run the pump that didn't run the last time each time you started it, even if you skipped a day at times.
  13. Replies
    39$$
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    594

    Not really what he said. But is a problem.

    Not really what he said.

    But is a problem.
  14. Replies
    14$$
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    320

    Where is the "service point"? Since you have...

    Where is the "service point"?

    Since you have MV disconnects within the facility, chances are your "service" is medium voltage. But at same time if POCO personnel is needed to operate MV equipment,...
  15. Replies
    39$$
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    594

    It is an arc, but it is typically on secondary...

    It is an arc, but it is typically on secondary side of a transformer and not an arc occurring in the actual supply circuit to the appliance.

    Inductive kickback, even from something on the supply...
  16. Replies
    17$$
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    372

    On/off function is likely already there or it...

    On/off function is likely already there or it runs 24/7 when "on", therefore only a timer to select which one runs today is all that is needed.

    If it is a "pump down or pump up" type of station,...
  17. Replies
    16$$
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    862

    What if anything is supplied by the "power...

    What if anything is supplied by the "power components"?

    Looks like something originally designed for some other application has been "re-purposed" either partially or even entirely.

    If this...
  18. Thread: Service Tap???

    by kwired
    Replies
    49$$
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    3,134

    You are reviving something that hasn't had a post...

    You are reviving something that hasn't had a post for about 4 months so I may be missing something, but I did say "unless 310.15(B)(7) applies". Without the allowances of (B)(7) 4/0 aluminum only has...
  19. Replies
    24$$
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    2,248

    But OP says this is in a basement, presumably in...

    But OP says this is in a basement, presumably in a basement in an area where flooding may be likely. That IMO changes things, and can depend on what measures are taken to prevent the basement itself...
  20. Replies
    208$$
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    3,776

    There are many cases where a receptacle is not...

    There are many cases where a receptacle is not the "outlet" and is within a feeder. Receptacles supplying mobile homes, RV's and similar situations are not installed in the branch circuit are they?...
  21. Replies
    6$$
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    458

    What kind of washdown frequency will there be,...

    What kind of washdown frequency will there be, will there be use of caustic and/or acid agents when washing?


    The more corrosive potential you have the more stainless and plastics/fiberglass ...
  22. What is the "dead front" GFCI for, some other aux...

    What is the "dead front" GFCI for, some other aux equipment like maybe some lights or something?
  23. Thread: It works.

    by kwired
    Replies
    22$$
    Views
    1,260

    To have a current rating one must also have a...

    To have a current rating one must also have a maximum operating temperature to go with it.

    With most conductors we deal with insulation and terminations are limiting factors on maximum design...
  24. Replies
    208$$
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    3,776

    Right, MWBC is not a single voltage, and...

    Right, MWBC is not a single voltage, and certainly isn't limited to something with 120 volts involved, 120 is pretty popular voltage to be involved though.

    If anything (and has sort of been...
  25. Replies
    6$$
    Views
    458

    I haven't ever been in a brewery, but if like...

    I haven't ever been in a brewery, but if like many other food/beverage industries 4X enclosures may be a very good idea, even if NEMA 4 passes initially, when it is showing signs of rust inspecting...
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