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  1. Replies
    1$$
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    Marine Question - Xfmr and Ground

    Working on a marine project if anyone here has some marine experience.

    Question 1: (See attached Pic).... the Upstream xfmr is shown Delta/Wye and the downstream transformer is delta/delta. does...
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    Were these stamped drawings for $250? my god...

    Were these stamped drawings for $250?

    my god if PE's are stamping drawings for 250 bucks I don't want to live in this country anymore
  3. the riser seems to show the 3 strings landed on a...

    the riser seems to show the 3 strings landed on a common bus right at the inverter (which would indicate to me actually 6 thwn-2 cables from JB to inverter)

    however, the schedule says "1" for...
  4. Each string must have it's own individual ocpd?...

    Each string must have it's own individual ocpd? So the combiner box has a fuse for each string? Is this this a code requirement somewhere?


    I understand there is only one DC ocpd at the solaredge...
  5. PV conductor transition from PV cable to THWN-2

    I am reviewing this project and have a question about the cables transitioning from PV cable to THWN-2.

    they show "quantity 3" PV cables to transition JB but "quantity 1" THWN-2 cables from JB to...
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    Thank You Ggunn. Lastly, this project is a...

    Thank You Ggunn.


    Lastly, this project is a nearby (to the house) ground mounted pv system. Would you use pvc underground from the arrays to the inverter (inverter located next to main service...
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    Residential Underground conduit

    would you use emt or pvc to go underground from a nearby ground mtd. pv system to the house service panel?
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    PV Load side tie-in, disconnect requirement

    If I am connecting my inverter on the load side using a breaker in the main panel (40A PV breaker)... Do I need a separate disconnect between this PV breaker and the inverter?


    Lastly, what is...
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    do electricians typically use power distribution...

    do electricians typically use power distribution blocks inside wireways or do they prefer to just splice the cables?
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    emerg. ATS feeder wiring 2hr rating

    Do I need to transition to MI cable during any portion of the routing of my emerg. feeder cable if the routing is as follows to satisfy 700.10(d)?


    ATS in 2nd fl. 2hr emerg. room -> riser down...
  11. Equipment Enclosure/Control Panel Penetration

    If I need to penetrate a compressor equipment enclosure or even a control panel for armored cable pass-thru, using cable glands with seals, does that affect the NEMA rating of the panel or warranty...
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    thanks Jraef. There are fuse requirements in...

    thanks Jraef. There are fuse requirements in UL508 for Class 2 panels? I thought these were non-UL listed/ non-AHJ approved.

    I was just going to come off one 20A lighting branch ckt to the panel...
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    another question is the max power supply allowed...

    another question is the max power supply allowed for a class 2 ckt is 100VA. Can I have two 100VA power supplies in the same panel if I need more than 100VA of class 2 power (split in 2 ckts)
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    thanks. Yes all class 2 power supplies (24VDC),...

    thanks. Yes all class 2 power supplies (24VDC), not required to be UL listed or AHJ approved. Just wondering if I need a miniature breaker or fuse inside the panel. Maybe this is a better question...
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    Instrument Panel OCPD

    I have an instrument panel, no control of motors or anything, just a bunch of controllers in it for connecting field sensors (vibration/RTDs) and transmitting signals for trending.

    Are there any...
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    What is the difference btw 700.10(D) and 700.12?...

    What is the difference btw 700.10(D) and 700.12?

    I find this confusing
  17. Equipment Enclosure Internal Cable Management/Support

    I am trying to figure out if there are any standards anywhere that guide how instrument cables inside a large equipment enclosure are managed/supported.


    We have very large service air...
  18. Thanks Jraef. That makes sense, wouldn't want to...

    Thanks Jraef. That makes sense, wouldn't want to pass thru removable door/panel then you can't open it. Do they make those glands with seal for Armored Instrument Cable?
  19. Equipment Enclosure penetration for instrumentation cables

    We have large air compressors that we want to install vibration sensors on the motors. These compressors are housed inside an equipment enclosure kind of like this 22827



    want to make a...
  20. 312.6(A) seems to say that a wiring duct shall be...

    312.6(A) seems to say that a wiring duct shall be installed for wiring inside an electrical cabinet.

    Do I understand that right? Meaning you can't just have loose or wiring routed within with just...
  21. Electrical Box Fill - Does it apply to Cabinets?

    Just wondering if the electrical box fill calculations, meant for outlet boxes, also apply to equipment cabinets too?
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    This doesn't make sense to me. It's essentially...

    This doesn't make sense to me. It's essentially the bus of the switch. So if the bus can only handle 10KA you can put in 10000000000000000KA fuses in there still going to explode at +10KA. I must be...
  23. there are different adapters for different...

    there are different adapters for different bkr/amp ratings. IE, if you are going to use the 50A breaker, you use adapter A if you're going to use the 30A bkr you use adapter B etc.
  24. awesome, question answered. For the wall...

    awesome, question answered.

    For the wall connector obviously you set the current with the dip switches.

    For the mobile connector, the car draws different current depending on the adapter used....
  25. I'd bet that's not how it's done. They're not...

    I'd bet that's not how it's done. They're not controlling how much current goes thru by the size of the cable.

    There must be a selection setting on the screen for charging configuration. prob...
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