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Type: Posts; User: GoldDigger

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  1. Replies
    3$$
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    73

    Carrying a little teeny CPR adapter, to...

    Carrying a little teeny CPR adapter, to facilitate re-use.
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    13$$
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    486

    The most recent and most plausible description,...

    The most recent and most plausible description, from earlier today, from ConEd, was that a 13kV cable failed and the protective relaying system intended to isolate such a fault did not function as...
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    12$$
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    415

    4. Technically, no. The raceway must be complete...

    4. Technically, no. The raceway must be complete before the wire is pulled.

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  4. Replies
    8$$
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    269

    There is no simple formula that could possibly...

    There is no simple formula that could possibly work that does not take into consideration what the exterior ambient temperature is and what the internal operating temperature limit of the VFD is. Not...
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    4$$
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    341

    IMHO, the conductors from the tap connector to...

    IMHO, the conductors from the tap connector to the inline fuse would be considered tap conductors while the listed tap connector itself is likely not. But an inspector may not have a problem with a...
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    36$$
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    2,074

    A significant difference between remodelling...

    A significant difference between remodelling (most often of a residence currently occupied by the owner) and new construction (most often speculative building for a company planning to sell to...
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    30$$
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    1,220

    As long as the ripple percentage is low compared...

    As long as the ripple percentage is low compared to the DC component, the difference between average and RMS will be small, and may not justify the extra expense of a true RMS meter or the...
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    12$$
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    685

    If it actually goes inside the building rather...

    If it actually goes inside the building rather than staying on the outside surface of the wall, you probably fail on having the disconnect as close as possible to the point where it enters the first...
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    29$$
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    1,523

    FWIW, a breaker for 50Hz has to work just a...

    FWIW, a breaker for 50Hz has to work just a teenie bit harder to suppress the arc on opening than one good only for 60Hz. I would pay attention to the nameplate and not the breaker.


    Sent from my...
  10. Replies
    51$$
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    2,781

    Pad mount transformers are not as weight...

    Pad mount transformers are not as weight sensitive for design decisions?

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  11. Replies
    89$$
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    2,289

    Your point is well taken. The extra current may...

    Your point is well taken. The extra current may not flow very far in the bus, but it certainly traverses the bus stabs.

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  12. Replies
    27$$
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    1,336

    You can have a two-phase/4-wire distribution...

    You can have a two-phase/4-wire distribution system fed from a two-phase/5-wire source with the neutral point solidly grounded but not routed to the load. It would be safely grounded and support 240...
  13. Replies
    12$$
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    469

    Close translation would be equipment or system of...

    Close translation would be equipment or system of equipment working together, I think.

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  14. Replies
    12$$
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    509

    Technical. The thermodynamics is different enough...

    Technical. The thermodynamics is different enough that it requires a different basic design.

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  15. Replies
    68$$
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    2,890

    Only if the EGC or bond is open. Possibly VD on...

    Only if the EGC or bond is open. Possibly VD on neutral from another load. Hot/neutral reversal could be in termination to receptacle.

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  16. Replies
    112$$
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    3,976

    To some extent, but do not think that the voltage...

    To some extent, but do not think that the voltage gradient is anywhere near uniform over the distance from fault to substation. To the extent that the fault current is greater for the shorter...
  17. Replies
    112$$
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    3,976

    Only when the distance to the substation is...

    Only when the distance to the substation is comparable to the size of the sphere of influence of the GES at both ends.
    Almost all of the voltage drop at the surface occurs within ten times the...
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    112$$
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    3,976

    One serious risk would be that if you had an...

    One serious risk would be that if you had an isolated earth electrode to a machine or PV array, then the exposed metal could be at a high potential to neutral unless a solid EGC connection to the...
  19. Replies
    112$$
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    3,976

    One reason is the multiple earth electrode...

    One reason is the multiple earth electrode grounds along the primary neutral. At the current and voltage present they are effective alternate fault current paths.

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  20. Replies
    9$$
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    724

    The OP states a concern that deenergizing...

    The OP states a concern that deenergizing (applying) the brake will cause mechanical damage. What is the basis for this belief? Has an engineer looked at the situation? Is there a chance that...
  21. And you do not have anyplace to host it? Sent...

    And you do not have anyplace to host it?

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  22. Replies
    6$$
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    325

    You can defeat the rejection feature of the bus...

    You can defeat the rejection feature of the bus that prevents installing twins by using twin breakers whose bus interface is identical to the single breakers. (They may cost more.)

    Sent from my...
  23. Replies
    23$$
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    1,157

    Many of the pushbutton air switch kits are...

    Many of the pushbutton air switch kits are alternate action instead of momentary. The leakage issue does not arise.

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  24. Replies
    23$$
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    1,260

    Fiber optic cable? Or a POE powered repeater...

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

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  25. 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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