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  1. Replies
    2$$
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    89

    UL489 is the standard for Molded Case Circuit...

    UL489 is the standard for Molded Case Circuit Breakers, so IF they are listed under UL489, then yes.

    Might be kind of a moot point however because that code section is just defining a "disconnect"...
  2. Agreed. This doesn't appear to be a THERMAL...

    Agreed. This doesn't appear to be a THERMAL problem, which is what you asked. One year life span is definitely cause for concern, but unless you know the failure mode of the previous motor, you can't...
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    4$$
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    141

    You can add a Shunt Trip coil to almost any...

    You can add a Shunt Trip coil to almost any circuit breaker and then use a Phase Monitor Relay to energize the Shunt Trip Coil.
  4. That is a Baldor Ex Proof Motor for a Class 1...

    That is a Baldor Ex Proof Motor for a Class 1 environment, the “Code T2C” is the maximum surface temperature and for that motor it is 230C (446F). You are nowhere even close to a problem.

    There...
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    8$$
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    220

    “AIC” stands for Amps Interrupting Capacity. The...

    “AIC” stands for Amps Interrupting Capacity. The term only applies to things that INTERRUPT a Fault (i.e. a circuit breaker or fuse). A UPS is not such a thing, so you will not find an “AIC rating”...
  6. You are not changing the RATING of the switch,...

    You are not changing the RATING of the switch, you are just changing how you USE it. Disconnect switches only come in a few sizes; 30, 60, 100, 200, 400, 600, etc. So WHENEVER you need a CIRCUIT...
  7. Thread: over current

    by Jraef
    Replies
    11$$
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    369

    Are you sure it is over CURRENT? Seems odd on a...

    Are you sure it is over CURRENT? Seems odd on a lowering operation, but Over Voltage would not be unusual if there is no braking resistor. But it COULD be OC depending on what drive it is. Some of...
  8. Thread: ATS surge

    by Jraef
    Replies
    1$$
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    128

    Depends on how you define that. The UPS design...

    Depends on how you define that. The UPS design will be the determining factor because if it is PWM and has a cap bank, there is an increase in current after a line interruption as the caps recharge....
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    11$$
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    508

    What would hold it on any other time? Screws.

    What would hold it on any other time? Screws.
  10. Replies
    11$$
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    508

    Put a listed metal cover on the j-box, then put...

    Put a listed metal cover on the j-box, then put the wood cover on top. Route out pockets for the metal cover screw heads on the back side of the wood plate.
  11. Thread: LOwer or higher

    by Jraef
    Replies
    7$$
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    235

    Robotic gopher Ninja! Lower frequencies are...

    Robotic gopher Ninja!

    Lower frequencies are better for solid obstacles for sure, if that’s what the problem is. Aside from a pipe that has become accidentally energized, there’s also the...
  12. Thread: XHHN - XHWN-2

    by Jraef
    Replies
    8$$
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    377

    N always means Nylon jacketed for resistance to...

    N always means Nylon jacketed for resistance to oil and gas, so I'd say you got it.
    X = XLPE insulation material
    H = High (heat)
    W = Water Resistant
    N = Nylon jacketed (in all other wire...
  13. Replies
    4$$
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    159

    Was it working previously and not it has stopped,...

    Was it working previously and not it has stopped, or is this the first time you are trying to connect to it?
  14. Replies
    37$$
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    1,177

    When I worked for Siemens and went through what...

    When I worked for Siemens and went through what was essentially the original ITE training program (meaning it was very old by then), the 42 pole limit (not CIRCUITS by the way, POLES) was based upon...
  15. Replies
    10$$
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    519

    Huh. Somehow I must have missed the statement...

    Huh. Somehow I must have missed the statement about having the 480V service... I was reading it from my phone at that time, I guess I just missed it (or it was edited after I posted that).

    I...
  16. Replies
    3$$
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    200

    Most, if not all, of the industrial labeling...

    Most, if not all, of the industrial labeling suppliers have those available, pre-printed with spaces for you to fill in the data with a Sharpie, or blank for you to use in a printer.
    21210
    21211
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    10$$
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    519

    At a basic level, I don’t see why 480/277 is...

    At a basic level, I don’t see why 480/277 is being brought into the discussion at all on a 208/120 service. Was there a typo somewhere and the SERVICE is 400A at 480, then they want a 200A 208/120...
  18. I am closing this thread, in accordance with the...

    I am closing this thread, in accordance with the Forum Rules.

    If you feel this action to be in error, feel free to contact me via PM to explain.

    A reminder to all members, if you see a...
  19. Write it all out in a letter now and send it...

    Write it all out in a letter now and send it registered, receipt requested so that you possess a document regarding your concerns and the state in which you left it.
  20. Replies
    7$$
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    323

    That first one is sure an oddball votlage. All I...

    That first one is sure an oddball votlage. All I can think of it being used for might be as an input transformer for a 1000VDC drive from a 480V source.
  21. Just addressing this part of it: In theory...

    Just addressing this part of it:

    In theory because the protection is based on current, current in any circuit is the same at any point in the circuit, so it shouldn't matter.

    In practice, there...
  22. Replies
    8$$
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    277

    This is an important distinction, it makes all...

    This is an important distinction, it makes all the difference in the world.

    Condensed version: Current Total Harmonic Distortion (I-THD) is what is caused by your non-linear loads and becomes...
  23. Replies
    2$$
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    194

    I am closing this thread, in accordance with the...

    I am closing this thread, in accordance with the Forum rules. This Forum is intended to assist professional electricians, inspectors, engineers, and other members of the electrical industry in the...
  24. Replies
    6$$
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    419

    It depends. From what I've seen, some use water...

    It depends. From what I've seen, some use water or other non-volatile solutions in the extraction process, some use oils and some of those can be volatile.
  25. Replies
    4$$
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    No. Flux braking is a term that applies to VFDs...

    No.
    Flux braking is a term that applies to VFDs that have an option for true "Flux Vector Control" (as opposed to the simpler and cheaper "Sensorless Vector Control") In FVC in it's any forms, the...
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