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Type: Posts; User: Mike01

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    Withstand Ratings For Panels??

    Does UL address withstand ratings of panelboard and switchabords? Do panel and switchboards have published withstand ratings? Just curious with the use of the newer technology in the electronic trip...
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    Multi-Conductor

    For this application a TC consisting of 3-1/C+Grd with an overall PVC jacket, however the 392.80[C] references multi-conductor cables I assume this includes TC/MC type cable.
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    Cable Ampacity Adjustment

    When installing multi-conductor [MC] type cable in tray using the higher ampacities based on proper cable spacing etc. How is it affected when you transition to conduit for a short run? I thought it...
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    Inst. Value

    Correct, in the second link [page 3, figure 4] shows the image of the instantaneous trip unit with what I call the "ticker tape" type that actually indicates the trip setting on the indicating metal...
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    CO-8 instantaneous follow up?

    As a follow in looking at some with indicating instantaneous trip units, there are three taps available 6-20; 20-40 & 40-144. When the tap is in either of these [for example 40-144] how can you tell...
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    Westinghouse CO-8 settings?

    In looking at a previous relay setting table I came across something I was hoping someone could help me interpolate. The relay in question is a Westinghouse CO-8 style, that I understand now that...
  7. Thread: motor ?

    by Mike01
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    394

    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...
  11. Thread: Megger ?

    by Mike01
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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]...
  22. Thread: VE Ideas

    by Mike01
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    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...
  23. Thread: Good Old Daze

    by Mike01
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    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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