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Type: Posts; User: Mike01

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  1. Replies
    5$$
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    WP In use Cover ?

    On a project the client wants to install a key type switch [similar to the Leviton 1221-2KL] outdoor to prevent inadvertent operation over a standard toggle, however in looking at this closer I do...
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    SCCR

    To provide an example to what Charlie b already pointed out when you look at non-fused switch [safety switch] from most manufactures you will find a similar table that indicates the non-fused safety...
  3. Thread: Low PF

    by Mike01
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    2$$
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    265

    Low PF

    I was at a testing facility recently and had a chance to peek at some of their load data when I noticed that the when the test was running it would operate with a pf between 75-85 however for a...
  4. Thread: D.C. Breakers

    by Mike01
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    8$$
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    550

    480vDC

    GoldDigger thanks, this application happens to be using 480vDC.
  5. Thread: D.C. Breakers

    by Mike01
    Replies
    8$$
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    550

    D.C. Breakers

    In looking at an installation with remote DC [batteries] I noticed the battery breakers provided have two poles wired in series from the factory [for example load side of phase “a” is pre-wired to...
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    1$$
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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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    15$$
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    1,861

    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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    15$$
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    1,861

    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...
  12. Thread: motor ?

    by Mike01
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    670

    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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    1$$
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    669

    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...
  16. Thread: Megger ?

    by Mike01
    Replies
    9$$
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    1,330

    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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    1$$
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    448

    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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    15$$
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    2,264

    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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    3,022

    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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    11$$
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    3,022

    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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    1,218

    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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