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Type: Posts; User: Mike01

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  1. Replies
    5$$
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    369

    No it's, not a classified space, I just assumed...

    No it's, not a classified space, I just assumed any opening into a piece of switchgear should be sealed to prevent from dust / water ingress of anything really, even if not code required, good...
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    5$$
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    369

    No Jacket..

    Joe, thanks however there is not outer or "overall jacket" it is three conductors installed in a triplex arrangement or even in a twisted arrangement, without an overall jacket when these conductors...
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    5$$
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    369

    Conductor Installation

    When single conductors are installed [triplexed or another configuration] in a cable tray installation when the conductors enter the equipment is there a certain type of connector or fitting...
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    2$$
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    173

    Cable Tray Grounding

    When installing IAC cable in cable tray [parallel runs each with a ground conductor in the IAC], is the grounding jumper installed on the cable tray considered a "supplemental ground"? Because the...
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    2$$
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    256

    Fuse / Wire Size Coordination

    At a project site today, there was a 30A disconnect switch with 25A fuses with #12 wire...looking in the code the #12 wire is protected by the 25A fuses but is this acceptable if the switch is rated...
  6. Thread: Zero Hertz?

    by Mike01
    Replies
    4$$
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    398

    Zero

    Yes, that's it just trying to understand more about the relay, it appears to be used for DC equipment with LSIG functions like a standard electronic trip unit just curious why it's called Zero Hertz??
  7. Thread: Zero Hertz?

    by Mike01
    Replies
    4$$
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    398

    Zero Hertz?

    I was looking for information on a "Zero Hertz Relay" hoping someone could point me in the right direction. Thanks..
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    7$$
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    487

    ?? Why ??

    Not sure why, not sure why incandescent?? I was just asked if it could be done. I did not think so and when I started looking around wondered if it was possible, learned something new today. Thanks...
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    7$$
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    487

    120V Dimmer Control

    Someone asked me this and was not 100% sure how to respond, "can you use 0-10V to dim an incandescent source" I got to thinking about it and could not find a product to do such a thing, is it even...
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    12$$
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    678

    Poll: Transfomrer or First Disconnect?

    Bonding preference:
    @ the transformer?

    @ the first disconnect?

    Just curious on preferences / advantages / disadvantages to one vs. the other??
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    3$$
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    595

    Cable Tray Parallel Feeder Ground Conductor

    When parallel conductors are installed in cable tray [using 1/C tray rated cables triplexed] is a ground required for each set or one for the entire circuit of parallel conductors? I was on a job...
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    6$$
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    706

    LVPCB

    Ron,
    I will post the TCC when I have a chance the breaker is a LVPCB with 1600A frame and sensor, the LT setting has been adjusted to 0.5 [800A]. I understand the actual fault current [as...
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    6$$
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    706

    TCC - Equipment Protectoin

    In looking at a coordination study I noticed the following:
    Main switchgear consist of 480V ANSI Sw. Gear. [single ended] with LVPCB's and electronic trip units

    Feeder No.2 is a 800A feeder with...
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    2$$
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    341

    MWBC & Voltage Drop

    Have a friendly discussion in the office on this one but trying to work out the math part of it. With a MWBC [typically for lighting] I see a lot of 277V fixtures connected to a 480Y/277V MWBC with...
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    2$$
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    562

    MV Equipment Grounding Conductors

    Is an equipment ground in a MV 13.8kV sized any different than in LV systems, do you refer to 250.122? Looking thru. 250.180 it discusses grounded conductors and in 250.184(B)(8) indicates that it...
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    6$$
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    721

    MWBC - Stray Voltage

    On a multi wire branch circuit [from a 208Y/120V panel fed from a 30kVA xfmr] with one breaker / phase turned off, there is still a reading of 24V, measured at the receptacle? Sounds to me like a...
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    3$$
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    387

    Conductor Volume?

    When calculating box fill, where can I find or better yet how does one calculate the volume of a conductor larger than a #6 the maximum indicated in table 314.16[B], where it terminates to a device...
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    4$$
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    451

    312.6 Wire Bending??

    312.6 refers to wire bending, however there are no bends in the cable it will enter the enclosure and then terminate on the lugs, it will not be entering and leaving the enclosure, or "bending"...
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    4$$
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    451

    Minimum Space encosure to lug..

    I was looking [I thought there was] for a table that indicates the minimum dimension form the termination lug to the enclosure wall based on the cable size and quantity per lug. For some reason I...
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    2$$
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    695

    "Heavy Duty Lamp Holder"

    How would I find out if a fluorescent lamp socket complies with NEC Article 210.21[A] for heavy duty lamp holder?
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    3$$
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    477

    Building Addition Grounding 250.50[2]

    In 250.50[2] Metal Frame of the Building or Structure for a grounding electrode system is every column of the building required to meet one of the three requirements? For example I am working on a...
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    9$$
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    754

    Overlap / Coordination

    Looks like this is a Molded Case Circuit Breaker [UL489] with an adjustable electronic trip unit [310] [LSI], it appears the instantaneous on this unit cannot be disabled due to the fact it is a MCCB...
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    1$$
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    291

    Buck Boost Xfmr OCPD?

    having a friendly debate with a co-worker about a A BB xfmr. OCPD from 208-240 with and wanted to get you thoughts / opinions at 2kva [16x32 voltage windings] with the max secondary amps at 62.5 and...
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    1$$
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    413

    Cable Tray and Grounding

    I was on a project site where 3-1/C cables were used in triplex in tray to serve equipment and only one-EGC was run for the parallel set of conductors, in looking at the code it appears that a ECG is...
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    5$$
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    392

    Garage?

    Bob, I agree I would like to use the ventilated requirements for minor garage however under minor garage it talks about gaseous fuels "will not be dispensed or transferred" that is where I am stuck...
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