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Type: Posts; User: GoldDigger

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  1. Replies
    129$$
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    Sometimes people confuse OSHA requirements with...

    Sometimes people confuse OSHA requirements with NEC requirements. :)
  2. Thread: 1st UFER.

    by GoldDigger
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    Not unless you want to. The way I read the...

    Not unless you want to.
    The way I read the section, bare is OK; zinc coated is OK; other coatings are OK only if they are conductive.
    The main point is that plastic or epoxy coated rebar could not...
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    If a 120/240V load was connected with its...

    If a 120/240V load was connected with its neutral connected to the feed through terminals of a GFCI, the fact that the GFCI interrupts the neutral as well as the hot could have caused an overvoltage...
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    The test button that is built in works fine since...

    The test button that is built in works fine since it uses an internal resistor to bypass some current around the sensing coil.
    But a plug-in tester will not work since it does not have access to the...
  5. But all of the little electrons who read the Code...

    But all of the little electrons who read the Code appreciate your effort. :)
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    "Underside" is commonly used to indicate the...

    "Underside" is commonly used to indicate the non-exposed side independent of orientation in space.
    "Inside" might have been clearer, but would still look a little strange.
    "Top" or "bottom" would...
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    It was determined that the load was almost...

    It was determined that the load was almost entirely desktop computers and that none of the individual lines were overloaded.
    So I would say that it was clearly established that the phase conductors...
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    314.28(A)(2)Exception specifically addresses the...

    314.28(A)(2)Exception specifically addresses the case of a back panel entry opposite a removable cover.
    There does not seem to be any other conditions on C as long as the entries are only on the...
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    32$$
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    Do you consider the neutral in modular furniture...

    Do you consider the neutral in modular furniture in an office to be a data center?
    I do not have a link at hand, but there are documented cases if smoke and more from the furniture.
    Interestingly...
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    39$$
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    IMHO you could even feed the branch circuit...

    IMHO you could even feed the branch circuit through a blank face AFCI in a box next to the main panel as long as the wiring from panel to box met the code restrictions for first outlet type...
  11. The output neutral terminal of the breaker would...

    The output neutral terminal of the breaker would not be used, but the input neutral pigtail would be used in combination with one of the hot leads to supply control power to the active electronic...
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    11$$
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    409

    Some of the induced voltage effects of a nearby...

    Some of the induced voltage effects of a nearby lightning discharge can be developed in the house branch and feeder wiring itself. A Type 1 at the main will not provide the best possible protection...
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    Old wives tale as far as NEC is concerned, but...

    Old wives tale as far as NEC is concerned, but state energy codes may address the subject.
  14. The fact that there is no neutral or other...

    The fact that there is no neutral or other grounded conductor does not take away the requirement for an EGC.
    And some sort of return path is necessary to be able to trigger a ground detector, even...
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    There is no 10' limit for service conductors....

    There is no 10' limit for service conductors. Instead we have "nearest the point of entry" into the building. The interpretation of that as a hard limit will vary from one AHJ to another.
  16. I would take the total load, both 220 and 240, on...

    I would take the total load, both 220 and 240, on the center tapped winding to get a power value. I would then use that figure along with the 240V loads on the other two windings. I would not expect...
  17. When looking at AC, the concept of polarity must...

    When looking at AC, the concept of polarity must necessarily be relative to some reference.
    That reference could be either some other current (not used by the overload relay) or voltage (also not...
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    503

    The heat that trips the thermal portion of the...

    The heat that trips the thermal portion of the breaker comes from a fixed resistance in series with the load, not voltage drop across the contacts.
    It is a voltage drop from line terminal to load...
  19. The motor can draw more current from one leg of...

    The motor can draw more current from one leg of the 240 that the other only if there is a current path to EGC or ground (and therefore back to the supply transformer neutral) where the source of the...
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    Whatever the Code specifies can still be made...

    Whatever the Code specifies can still be made more restrictive by local POCO policy, since it is their service wiring involved.
    They generally cannot force you to move the other wiring, they can...
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    25$$
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    561

    Without going into the (endless) argument, I will...

    Without going into the (endless) argument, I will point out that since the PV disconnect is "not a service disconnect", it could be in addition to the six permitted disconnects rather than included...
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    If you look at the way 120/240 3ph, 4-W is wired,...

    If you look at the way 120/240 3ph, 4-W is wired, you will see that the A-N and C-N voltages are both 120V, which matches the problem statement, but the B-N voltage would be 208V. So answer b cannot...
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    11$$
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    409

    Because microprocessor systems are easily damaged...

    Because microprocessor systems are easily damaged by surges that would have no lasting effect on purely elecrtromechanical components?
  24. For really large installations with multiple...

    For really large installations with multiple underground duct banks there are derating factors which are applied depending on the exact geometry of the duct bank. But I do not think that they would...
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    12$$
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    503

    While considering the panel change, try pulling...

    While considering the panel change, try pulling the breaker and looking at the bus stab contact points.
    Any visual damage or signs of overheating will just get worse, and might affect any new...
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