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Type: Posts; User: GoldDigger

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  1. Replies
    11$$
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    Fiber optic cable? Or a POE powered repeater...

    Fiber optic cable? Or a POE powered repeater (switch) in the middle?

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  2. No idea about strict code compliance, but I have...

    No idea about strict code compliance, but I have two questions:
    1. Is the CT considered to be "protected equipment"? Does it have to be in the same enclosure with protected equipment?
    2. Could you...
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    Was that an attempt to drag in the classic single...

    Was that an attempt to drag in the classic single phase versus two phase dispute for 120/240?

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  4. Right. If the control cable is a self-contained...

    Right. If the control cable is a self-contained wiring method that does not require a raceway, it should be able to share the enclosing raceway. But without the explicit UL listing that luminaire...
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    28$$
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    Simple overload. Too much equipment plugged in at...

    Simple overload. Too much equipment plugged in at one time. The sum of the branch breakers was greater than the back-up panel main. The design load calculations did not have each branch fully loaded...
  6. It seems to me that such a mismatch will burn out...

    It seems to me that such a mismatch will burn out bulbs and/or ballasts prematurely.

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  7. That is acceptable because of the separate jacket...

    That is acceptable because of the separate jacket around the Class 2 conductors.
    The argument is similar to the argument that two sets of wires, each inside their own EMT or Smurf tube, do not...
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    11$$
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    To elaborate on the primary neutral connection...

    To elaborate on the primary neutral connection issue: If the line to neutral voltages from POCO are not perfectly balanced and you connect the wye point of the winding, the unbalance will cause...
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    11$$
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    :thumbsup:

    :thumbsup:
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    First thought: Do not connect, nor even ground,...

    First thought: Do not connect, nor even ground, the 480V wye primary wye point/neutral. A delta-delta transformer at the POCO end might be more appropriate. Or else a delta-wye to allow the...
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    IMHO if the existing building did not require or...

    IMHO if the existing building did not require or have a CEE, the NEC or local code may still require that a CEE be connected if the new footings create one.
    If not, it may still be desirable to...
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    28$$
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    At a large experimental physics lab at Stanford,...

    At a large experimental physics lab at Stanford, backed up power was provided for those bits of equipment that would cause damage to the apparatus during an unplanned shutdown.
    Unfortunately the...
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    It appears to me that even if the insulated wires...

    It appears to me that even if the insulated wires are not rubbing at least one of the insulated connectors is.

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    A fireplace can generate CO2 also, as can a...

    A fireplace can generate CO2 also, as can a smouldering upholstery or carpet fire


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  15. Buck/boost transformer in the ceiling? Sent...

    Buck/boost transformer in the ceiling?

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  16. The quote was misleading in it's statement that...

    The quote was misleading in it's statement that the transformer did not need to supply the entire 60A the load requires. More understandable, perhaps, would be to state that it does not need to...
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    38$$
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    To be technical but not necessarily legislated,...

    To be technical but not necessarily legislated, knowing (being reminded) that the wild leg is at a higher voltage to ground can be helpful, even when the neutral is not used.

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    There is a file size limit for uploaded images....

    There is a file size limit for uploaded images. Reduce the size or resolution or find a photo hosting site that allows public viewing.

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    92$$
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    The net resistance is indeed not zero, but most...

    The net resistance is indeed not zero, but most if not all of that resistance is the term associated with the earth electrode resistance rather than the distance to the uniground point. If the two...
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    92$$
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    So what is a typical impedance for 10 miles of...

    So what is a typical impedance for 10 miles of earth?

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    But that would not be a permanently installed...

    But that would not be a permanently installed cooking means.
    You could also put in one or more induction hobs.

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    If the LED fixtures have a .9 PF, that is all you...

    If the LED fixtures have a .9 PF, that is all you really need to know. The effect of harmonics is already included in that. You just cannot compensate for it with capacitors.
    As for the VFDs, with...
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    92$$
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    I am not sure..... It would potentially be...

    I am not sure..... It would potentially be different if there is a grounding transformer with an earth grounded wye point at the end, but that would not be unigrounded.

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    12$$
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    The downside is that the voltage output signal at...

    The downside is that the voltage output signal at high impedance has to go through an amplifier processor circuit. I do not recall the exact nature of the output signal.

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    92$$
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    A ground rod farther from the substation does not...

    A ground rod farther from the substation does not have a higher ohm value to the substation ground. A unigrounded system does not have a ground rod distant from the substation. So the transient...
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