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  1. The building documents should indicate the...

    The building documents should indicate the planned usage and that will determine the allowed construction. In some cases zoning will indicate, for example, single family residential.
    Just looking at...
  2. Thread: Taps.

    by GoldDigger
    Replies
    4$$
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    77

    It would only be a tap in the NEC sense if the...

    It would only be a tap in the NEC sense if the 14/3 were protected at the downstream end by its own 15A OCPD.
  3. :thumbsup::thumbsup: I.E. the same conditions...

    :thumbsup::thumbsup:

    I.E. the same conditions that require steel and concrete construction also require other than NM for wiring.

    Not everyone agrees with this interpretation, although the...
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    AFAIK some single filament bulbs may have an...

    AFAIK some single filament bulbs may have an inadvertent solder blob that intrudes from the bottom of the shell into the area of the extra contact in a three way socket.

    BTW, the three-way bulb...
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    399

    Another way to look at it is that collisions with...

    Another way to look at it is that collisions with parking lot poles will (we hope) be low speed while collisions with roadway poles may be high speed. In most states road poles and signs have a...
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    But only when exposed at the surface, not...

    But only when exposed at the surface, not underground!
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    One reason to install a three wire receptacle...

    One reason to install a three wire receptacle with no EGC is that it is very hard to find a tamper resistant two wire receptacle.
  8. Thread: Gfci

    by GoldDigger
    Replies
    35$$
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    1,444

    Low resistance connection (downstream bond)...

    Low resistance connection (downstream bond) between neutral and EGC, even on line side, might cause a trip?
  9. Replies
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    And the name distinction is important to the...

    And the name distinction is important to the extent that bi-directional energy flow makes a difference.
    If we are going that route maybe we should also distinguish between the disconnect for PV...
  10. Replies
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    914

    The tin can and string has no power gain and so...

    The tin can and string has no power gain and so will be limited in application.
    The carbon microphone and earphone or speaker can definitely produce a higher sound energy output than the tin can and...
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    7$$
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    438

    When you said IPA my first thought was beer...

    When you said IPA my first thought was beer (India Pale Ale). :)
  12. Not many MDPs qualify but a dedicated combiner or...

    Not many MDPs qualify but a dedicated combiner or interconnect panel built using MDP components generally will.
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    3$$
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    The neutral at the PV system should be connected...

    The neutral at the PV system should be connected to the wye side since the voltage from the inverter will automatically match the utility voltage, as set by the POCO voltage on the delta winding.
    In...
  14. Replies
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    1,101

    We have discussed two cases above. When low...

    We have discussed two cases above. When low impedance (current sensing) meters are placed in series, shorting one of the meters will leave current flowing through the others. If one meter failed open...
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    1,741

    *sarcasm on* If the manufacturer of a piece of...

    *sarcasm on*
    If the manufacturer of a piece of 120V equipment cannot figure out how to design their leakage below 4ma, they can just make it a 240V appliance with the only thing on the other hot...
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    25$$
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    991

    The grounded conductor is a grounded wire "used...

    The grounded conductor is a grounded wire "used like a hot" only in the sense that it can go to one of the terminals of a three phase motor and it is part of the phase rotation. The latter is one...
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    FWIW, there have been multiple posts in the past...

    FWIW, there have been multiple posts in the past few years from ECs who were required to dig into poured concrete for new buildings where no CEE was provided for during the pour but the rebar met the...
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    1$$
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    183

    First cut: 1. The winding of the transformer...

    First cut:
    1. The winding of the transformer toward the switchboard is functionally the primary, since that is the winding which will first be energized and therefore supply the inrush current. If...
  19. Replies
    80$$
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    1,976

    Actually, the code and various interpretations...

    Actually, the code and various interpretations and opinions are pretty clear: If you have an AHJ who requires the CEE (UFER) to be bonded it will do you no good to bury it and try to ignore if.
    The...
  20. Thread: EGC

    by GoldDigger
    Replies
    2$$
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    252

    Generally no. And instead of EGC they call it...

    Generally no.
    And instead of EGC they call it PE for Protective Earth.
    They care a lot about having a low impedance local GES too, because at 240V and up it can be a usable fault clearing path....
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    AFAIK there are two distinct usages of hum...

    AFAIK there are two distinct usages of hum bucking.
    1. The one you describe where the goal is to isolate the wanted signal caused by string vibration from the unwanted signal caused by the ambient...
  22. Yes, that is a basic premise of what is called...

    Yes, that is a basic premise of what is called linear algebra in the optimization and analysis domain, and the optimization process is sometimes as simple as checking corner points.

    There are some...
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    33$$
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    914

    The electromagnets (used to produce the field...

    The electromagnets (used to produce the field against which the voice coil acts) often double as the input choke in the DC power supply, so not wasting as much energy as you might think.
    If the...
  24. It could be a 100A service with two disconnecting...

    It could be a 100A service with two disconnecting means instead of just one. Up to six are allowed.
    But the size of the service is whatever POCO says it is. Do they bill for a 100A service?
    It...
  25. It is not relevant as long as the phase angle of...

    It is not relevant as long as the phase angle of all three loads is the same.
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