Search:

Type: Posts; User: synchro

Page 1 of 5 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    10$$
    Views
    308

    And the bases were loaded too!

    And the bases were loaded too!
  2. Replies
    10$$
    Views
    308

    Perhaps there's enough leakage to ground on the...

    Perhaps there's enough leakage to ground on the home run that it was causing the GFCI breaker to trip?
  3. The harmonic distortion of solar inverters can...

    The harmonic distortion of solar inverters can cause a very small but apparently not negligible amount of heating in a distribution transformer when the photovoltaic backfeed is an appreciable part...
  4. Replies
    18$$
    Views
    509

    Below is an example from one jurisdiction where...

    Below is an example from one jurisdiction where "For Split-Buss panels the AC interconnection must be one of the six service disconnects."

    http://www.seatacwa.gov/home/showdocument?id=12585#page=5...
  5. Replies
    18$$
    Views
    509

    It could be done, but then it's very likely you'd...

    It could be done, but then it's very likely you'd have to give up one of the 2-pole breaker locations on the main bus anyway in order to meet the maximum of 6 disconnects grouped in one location...
  6. Replies
    18$$
    Views
    509

    Reposted below with quote added.

    Reposted below with quote added.
  7. Replies
    18$$
    Views
    509

    Some split bus panels have one bus that is for...

    Some split bus panels have one bus that is for lighting and other small loads, and this bus is fed from a breaker on a bus connected to the service. As mentioned above the bus connected to service...
  8. Replies
    36$$
    Views
    1,155

    Calculated using law of cosines with the 118V and...

    Calculated using law of cosines with the 118V and 105V phases at 120 degrees from eachother?
  9. Replies
    12$$
    Views
    538

    You might just check with your cellular provider...

    You might just check with your cellular provider what a hot spot would cost for the device and per month (which might be just a line charge if your have a package deal with other cell phones and a...
  10. Replies
    12$$
    Views
    538

    Perhaps you could use a remote desktop client on...

    Perhaps you could use a remote desktop client on a laptop or smartphone to access and control the PC at home that's connected to the inverters.
    If using a laptop it could be connected with a hot...
  11. Replies
    13$$
    Views
    593

    It would be unlikely, but perhaps the ground rod...

    It would be unlikely, but perhaps the ground rod hit a plastic gas pipe at or near a "cross bore" with a sewer pipe (i.e., penetration or damage of the sewer pipe by directional drilling when the gas...
  12. Yeah, but it didn't keep Tesla from trying: ;) ...

    Yeah, but it didn't keep Tesla from trying: ;)

    https://en.wikipedia.org/wiki/Tesla_Experimental_Station

    Recently WiTricity and others have developed products for wireless power transfer but...
  13. Replies
    7$$
    Views
    396

    What kind of load do you have on the filter...

    What kind of load do you have on the filter outputs? High frequency content from nonlinear loads or other sources may cause large currents to flow through the capacitors because of their decreasing...
  14. Replies
    12$$
    Views
    538

    Do any of the cell modem and cloud-based...

    Do any of the cell modem and cloud-based monitoring solutions for the photovoltaic market include near real time alarms if programmed limits have been exceeded?
    I know this capability is offered for...
  15. Thread: VFD's Tripping

    by synchro
    Replies
    18$$
    Views
    1,030

    Yes, the current through a series inductor is the...

    Yes, the current through a series inductor is the integral of the voltage across it (plus a constant) and so it will slow down the rate of rise (and the rate of fall) of the current. Of course if you...
  16. And if conductors have to be pulled because old...

    And if conductors have to be pulled because old ones have failed, then the liklihood that conduits have shifted or been crushed, etc. is even higher.
    If there are existing wires have you checked...
  17. Replies
    23$$
    Views
    1,157

    Wayne beat me to it ;)

    Wayne beat me to it ;)
  18. Replies
    23$$
    Views
    1,157

    One possibility could be to dig down somewhere in...

    One possibility could be to dig down somewhere in the middle of the run that would have a 465 degree cumulative angle after your 45 and 90 elbows are added in. Then you could cut the conduit, attach...
  19. Replies
    2$$
    Views
    290

    I agree that the annex shows the proper way to do...

    I agree that the annex shows the proper way to do the demand calculation. I believe the intent of the wording "shall be calculated on the basis of" does not mean that the kW from the table is the...
  20. Thread: VFD's Tripping

    by synchro
    Replies
    18$$
    Views
    1,030

    IGBTs are also subject to latch up because of...

    IGBTs are also subject to latch up because of their NPNP structure like in an SCR (which I like to think of as an NPN and a PNP connected with positive feedback):
    ...
  21. Thread: AB140m

    by synchro
    Replies
    24$$
    Views
    1,217

    Those readers and tags are on the LF (low...

    Those readers and tags are on the LF (low frequency) RFID band with carrier and modulation sidebands in the vicinity of 130 to 140KHz. So filtering of the VFD output to get sufficient attenuation at...
  22. Replies
    30$$
    Views
    1,502

    Yes, VDC = 3sqrt(2)/pi x VLine-Line RMS = ~1.35...

    Yes, VDC = 3sqrt(2)/pi x VLine-Line RMS = ~1.35 VLine-Line RMS

    About 1.4VDC should also be subtracted from the output to account for voltage drops in a pair of diodes inside the bridge.



    ...
  23. Replies
    5$$
    Views
    592

    The following is a comment from EasyPower about...

    The following is a comment from EasyPower about rectifier fault current:

    "Diode rectifiers can have DC terminal fault current close to the AC side fault current."
    ...
  24. Replies
    5$$
    Views
    592

    Do the rectifiers have any filter capacitors...

    Do the rectifiers have any filter capacitors associated with them?
  25. Replies
    89$$
    Views
    2,681

    I'm late to the game on this thread but I agree...

    I'm late to the game on this thread but I agree with this comment.
    I also don't think there's a good engineering justification to reduce the requirement on the busbar current rating by...
Results 1 to 25 of 121
Page 1 of 5 1 2 3 4