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  1. Thread: motor ?

    by Mike01
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    5$$
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    333

    motor ?

    How does the load on a motor effect it's P.F.?
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    motor starting ?

    For motor starting application, with an existing wye-delta starter and 6-lead motor, can the motor be re-connected to delta run and connected to a solid state reduced voltage starter abandoned the...
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    conductor ampacity

    When using cable tray ampacity for conductors installed in cable tray [free air rating as allowed in section 392.80[A][2][d]] when you transition from tray to conduit at what point are you required...
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    Safety Switch - Series Rating?

    Are non-fused safety switches reqruied to be provided with "series rated" labeling per the NEC where applied in applicaitons whree the fault current exceeds 10kAIC? In looking through different...
  5. Thread: Megger ?

    by Mike01
    Replies
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    Megger ?

    When megg. a cable [600V] in the absence of manufacturer data what is the recommended test value? In looking at ANSI/NETA ATS-2009 the table indicates 100mg. When a cable was tested [part of a splice...
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    Site Lighitng Pole Fusing

    I have seen projects in the past where pole fusing was specified and some where it was not called out. When I asked they indicated it was the contractors responsibility as it was "required by code"...
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    Loads?

    Just curious if you have researched the connected loads? Could the original installer have used two 1P breakers to server a single plase or three breakers to serve three phase loads with no handle...
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    Phil, not so much a spreadheet just trying to...

    Phil, not so much a spreadheet just trying to wrap my head around and understand voltage drop on a three phase branch cirucit that connects loads at single phase L-L. I have see this type of...
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    Three phase or Single Phase VD?

    So I have been searching the fourm and have seen this in a couple of thread's and trying to make sense of this. When installing single phase loads [L-L] across three phase circuits [L-L-L] how do you...
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    Confusing....

    If the Annex B tables are for information only and not used for Code compliance why are they published in the code? 390.80[A][1][c] references back to 310.15[C] Engineering Supervision, reading...
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    392.80[a][1][c]

    This refers to 310.15[c] with an information note to annex b Table B.310.15[2][3], when you reference this table this indicates that a 500kCMIL multi conductor cable at 75 degrees is rated for 416A....
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    Cable Tray Ampacity

    392.80[c] indicates where multi-conductor cable si sinstalled in tray with a min. spacing of one cable diameter the ampacity is based on "free air" rating in accordance with 310.15[c]? What is...
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    Multiple Circuits Single Ground

    When installing multiple circuits thru a pull / splice box [480V & 120V] once past the splice box they will be installed in the same conduit can a single grounding conductor be installed from the...
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    Grounding & Bonding Non-Metallic

    How do you bond a non-metallic [PVC] drum, where flammable liquids will be stored / transferred from a conductive or non conductive container? Is the bonding of a non metallic storage drum required?...
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    Working Clearance

    Code Violation?? A switchboard is installed on a 4" housekeeping pad making the top of the gear 7'-10" AFF [90" gear + pad], the equipment installed is tight to the structure above [1-2"clearance]...
  16. Thread: VE Ideas

    by Mike01
    Replies
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    1,934

    Cost Cutting

    Value engineering / more economical / cost effective / call it what you will a good topic some of these may have been mentioned previously off the top of my head:

    One thing I always look at is in...
  17. Thread: Good Old Daze

    by Mike01
    Replies
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    1,436

    250VDVC

    [QUOTE=rcwilson;1593383]I think those large black switches with the horizontal handles are actually circuit breakers. There are three dash pot trip units under each breaker with a linkage up to the...
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    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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    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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    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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    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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    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...
  23. Thread: Zero Hertz?

    by Mike01
    Replies
    4$$
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    592

    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??
  24. Thread: Zero Hertz?

    by Mike01
    Replies
    4$$
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    592

    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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    ?? 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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