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  1. Thread: Sleeves

    by ggunn
    Replies
    42$$
    Views
    938

    Some minor league team are experimenting with...

    Some minor league team are experimenting with ball and strike calls by automated systems. They are also trying out moving the pitcher's mound back by several feet. The point of the first is to remove...
  2. Thread: Sleeves

    by ggunn
    Replies
    42$$
    Views
    938

    Well, robot umpires are coming to baseball...

    Well, robot umpires are coming to baseball...
  3. Correlation does not prove causation.

    Correlation does not prove causation.
  4. Thread: It works.

    by ggunn
    Replies
    22$$
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    1,166

    Parallel? Are they AWG #1/0 equivalent?

    Parallel? Are they AWG #1/0 equivalent?
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    Not that there is anything wrong with it... :D

    Not that there is anything wrong with it... :D
  6. Thread: It works.

    by ggunn
    Replies
    22$$
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    1,166

    What is the current rating of those staples? What...

    What is the current rating of those staples? What is their AWG equivalent?
  7. Replies
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    Consider the source. It sounds like a pitch to...

    Consider the source. It sounds like a pitch to sell more copper.
  8. Replies
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    To be further technical, if there is no neutral...

    To be further technical, if there is no neutral then there is no high leg. :D
  9. Replies
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    It just seemed to me that if there were enough...

    It just seemed to me that if there were enough difference between the average between the power on A and the power on B for it to be significantly different from either that on A or B alone, the...
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    If it's balanced, wouldn't the power on phase C...

    If it's balanced, wouldn't the power on phase C be the same as either A or B?
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    501

    It won't produce much in there, although you can...

    It won't produce much in there, although you can energize it with the lights in the garage. :D
  12. Thread: 120 percent rule

    by ggunn
    Replies
    7$$
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    608

    The 120% rule itself did not change, but AC...

    The 120% rule itself did not change, but AC combiners that do not comply with it were legitimized. 705.12(D)(2)(3)(c).
  13. If no current is flowing then no power is being...

    If no current is flowing then no power is being used. P = VI, and if I = 0, then P = 0. How far along are you in your EE studies? That's first semester circuits stuff.
  14. Thread: 120 percent rule

    by ggunn
    Replies
    7$$
    Views
    608

    In general the 120% rule starts where an inverter...

    In general the 120% rule starts where an inverter output circuit lands in a panel and it does not end, i.e., it figures into the busbar calculations all the way back to the service. Of course, there...
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    7$$
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    Conduit bodies in inverter output circuits

    We work with one AHJ that will not allow a conduit body in any inverter output circuit between the PV AC disconnect and the point of interconnection, and another that will allow them if the inverter...
  16. And it's made even more complicated by the fact...

    And it's made even more complicated by the fact that every AHJ has its own special idiosyncrasies that may or may not have any basis in the NEC. We have a constantly evolving document that's now up...
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    I don't know why this would be a problem. The...

    I don't know why this would be a problem. The fact that the screwdriver is electric is irrelevant; the driver's power source isn't connected electrically to the power in the panel.
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    Oops.

    Oops.
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    First of all, OCPD on inverter output circuits is...

    First of all, OCPD on inverter output circuits is to protect the conductors from fault current from the service, not from the inverter; in a properly designed PV system the conductors are sized to...
  20. Your inspector has been passing systems which...

    Your inspector has been passing systems which have a code violation. Just because he used to do it doesn't mean he has to continue doing it. Maybe he was reprimanded for it.
  21. Replies
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    That was years ago. I suspect you are correct...

    That was years ago. I suspect you are correct about the spec error; I always use wye on the inverter side and delta on the utility side now.
  22. Well, OK, but what is the OCPD protecting the...

    Well, OK, but what is the OCPD protecting the equipment from? Overcurrent, yes, but how would such a thing happen? From the OCPD's point of view, how can it tell a hardwired piece of equipment from a...
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    Years ago lightning struck a power pole...

    Years ago lightning struck a power pole transformer near the house I was living in. It took out the 240V heating element in my dryer.
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    Some (most?) transformers are listed for...

    Some (most?) transformers are listed for bidirectional operation but some are not; that's a question for the manufacturer. You'll want your transformer to be delta (no neutral) on the utility side...
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    Always.

    Always.
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