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Type: Posts; User: Mike01

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    15$$
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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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    19$$
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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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    4$$
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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]...
  10. Thread: VE Ideas

    by Mike01
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    28$$
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    1,277

    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...
  11. Thread: Good Old Daze

    by Mike01
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    16$$
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    996

    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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    5$$
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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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    438

    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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    438

    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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    2$$
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    311

    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...
  17. Thread: Zero Hertz?

    by Mike01
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    4$$
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    452

    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??
  18. Thread: Zero Hertz?

    by Mike01
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    4$$
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    452

    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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    7$$
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    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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    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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    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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    790

    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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    790

    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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    419

    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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