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  1. Calculate the VA at 230V then use that value to...

    Calculate the VA at 230V then use that value to calculate amps at 208V. VA stays the same no matter what voltage.
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    Yes. There should also be over/under voltage and...

    Yes. There should also be over/under voltage and over/under frequency protection.
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    Besides the cases where GFP is required (1000A...

    Besides the cases where GFP is required (1000A and above systems), another advantage would be to prevent fault current from traveling through the solidly grounded neutral and into the normal...
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    Correct and i mentioned that in post #4. This...

    Correct and i mentioned that in post #4.

    This also validates what i have been saying. Why else would the 2017 code need to add specific "power supply cord" language to article 400 if they were...
  5. Are the disconnects mounted to high as well? I...

    Are the disconnects mounted to high as well? I don't see any eyelets on the handles.
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    It's all about the UL listing. All products,...

    It's all about the UL listing. All products, means and methods, etc. have to be listed for their use. This effectively categorizes or defines the difference between products. For example, the NEC...
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    That only applies to flexible cords. Power cords...

    That only applies to flexible cords. Power cords and adapters listed under UL 817 are not flexible cords and are not restricted by 400.8.
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    400.12 does seem to apply to flexible cord sets...

    400.12 does seem to apply to flexible cord sets and power supply cords.


    Informational Note: UL 817, Cord Sets and Power-Supply Cords,
    allows the use of flexible cords manufactured in accordance...
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    There should be no difference from how you would...

    There should be no difference from how you would size a feeder OCPD. You will need to consider a few things however:

    1. The generator manufacturer will size the breaker that is integral to the...
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    Same can be said about any product in that it...

    Same can be said about any product in that it needs to be listed for its use. I was merely trying to point out that NEC 400 shouldn't be applied to this product.
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    Article 400 only applies to cords that are listed...

    Article 400 only applies to cords that are listed under UL 62, refer to 400.1 and Informative Annex A. The cord that comes with the pop-up receptacle is most likely listed under UL 817 and is not a...
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    Either SKM or ETAP. If i am not mistaken, you are...

    Either SKM or ETAP. If i am not mistaken, you are only required to mark the service equipment. This can be done with a single calculation for available short circuit current using the exact utility...
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    I think that this set up is fine because there is...

    I think that this set up is fine because there is breaker separation of each ATS at the generator.
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    So you want to connect the life safety and...

    So you want to connect the life safety and critical ATS' to the output of the main ATS? A schematic would help here.
  15. Thread: UPS

    by jeremy.zinkofsky
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    An offline UPS should have integral filtering to...

    An offline UPS should have integral filtering to prevent distortions or sags from continuing downstream. An online UPS output should be a clean sine wave with no distortion or voltage drop...
  16. Why are you not feeding the ATS from the...

    Why are you not feeding the ATS from the switchboard? What is the rating of the switchboard, ATS, etc.? Does the switchboard have a main breaker?
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    Can't remember the last time I specified a line...

    Can't remember the last time I specified a line voltage occupancy sensor, but thanks for the clarification.
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    You will need a UL924 transfer device for any occ...

    You will need a UL924 transfer device for any occ sensor that is controlling a fixture used for life safety egress. This can get expensive real quick. Is it possible to use wall pack fixtures...
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    I personally would say no as the code...

    I personally would say no as the code specifically calls out switchboards, switchgear, panelboards, and MCCs. However, the exception creates grey area for disconnects. I have been dinged in the past...
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    "While Energized" is the key phrase. This...

    "While Energized" is the key phrase. This requirement goes away if you de-energize the circuit. So, if you can convince the inspector that the equipment will never be worked on while energized then...
  21. Amen

    Amen
  22. [QUOTE=mbrooke;1995258]Its done all the time for...

    [QUOTE=mbrooke;1995258]Its done all the time for motors and welders in the NEC. Heat loads in the CEC. Most fixed loads in BS7671.


    I was strictly speaking about linear loads. The NEC requires...
  23. If the OP is trying to understand the physics of...

    If the OP is trying to understand the physics of electrical design, then what you are saying is helpful. But if you are an electrician, the NEC exists to idiot proof your work. I would love to be...
  24. The main purpose of the OCPD is to protect the...

    The main purpose of the OCPD is to protect the conductors not the load. You cannot have an OCPD rated for more than what the conductors can handle. Inrush is the exception only because it is...
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    What good is digging into the physics of arc...

    What good is digging into the physics of arc flash if you are ultimately going to use the infinite bus method for approximating available fault current? That calc will give you conservative...
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