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  1. Replies
    5$$
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    211

    190626-9842 EDT If there was a solid short...

    190626-9842 EDT

    If there was a solid short circuit in the motor from hot to the motor frame, then for most branch circuit wiring the voltage motor frame voltage would be about 1/2 the supply...
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    20$$
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    451

    190626-0819 EDT electrofelon: So the...

    190626-0819 EDT

    electrofelon:

    So the previously shown tables are for secondary current not primary.

    Take my rough calculation for a Z as seen at the primary as being 3*Zpri for the 1/2 used...
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    20$$
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    451

    190626-0241 EDT ron: I have no idea what...

    190626-0241 EDT

    ron:

    I have no idea what the transformer label is telling me. You are an engineer. Have you analyzed a transformer circuit and tried to determine what that label means, and/or...
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    20$$
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    451

    190625-2333 EDT electrofelon and ron: I...

    190625-2333 EDT

    electrofelon and ron:

    I suggest you study electrical theory some, and do some experiments.

    What is the source of this statement? Exactly what circuit is being referenced?
    ...
  5. Thread: DC GENERATOR

    by gar
    Replies
    17$$
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    936

    190622-2257 EDT I did a search on automotive...

    190622-2257 EDT

    I did a search on automotive alternators and did not find any reference to any with no slip rings. It is possible to make one, but I doubt that it would be cost effective.

    .
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    10$$
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    463

    190622-2230 EDT Installer: Suppose your...

    190622-2230 EDT

    Installer:

    Suppose your resistance to earth is 10 ohms, many locations it is higher. Suppose a direct lighting strike produces a current of 1000 A, could be much higher. Then...
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    10$$
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    463

    190622-1502 EDTInstaller:HAAS CNC machines use a...

    190622-1502 EDTInstaller:HAAS CNC machines use a 100 ohm 1/4 W carbon composition resistor in series with each RS-232 input. On the HAAS side of the resistor, basically the input to the RS-232...
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    4$$
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    268

    190622-1426 EDT thewiseguy31: We need to...

    190622-1426 EDT

    thewiseguy31:

    We need to know what you are talking about.

    Gaseous discharge devices are what can be described as constant voltage devices. A constant voltage device is...
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    10$$
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    463

    190622-0841 EDT Installer: Probably typical...

    190622-0841 EDT

    Installer:

    Probably typical in its characteristics, which is not very good for real protection of electronic equipment.

    No curves were shown and I don't know what is in the...
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    10$$
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    463

    190621-2129 EDT Installer: Yes put a TVSS...

    190621-2129 EDT

    Installer:

    Yes put a TVSS at the input of the outside panel. Then put another TVSS at the input of the electronic equipment.

    You need to study the V-I characteristic of...
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    4$$
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    268

    190621-1658 EDT What is a mix and match...

    190621-1658 EDT

    What is a mix and match ballast?

    .
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    11$$
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    539

    190621-1652 EDT SteveO NE: Start testing...

    190621-1652 EDT

    SteveO NE:

    Start testing with a greatly reduced input voltage, and look for abnormal current and voltage. Start at a voltage where no tripping occurs.

    .
  13. 190620-1654 EDT Jon456: The NEC can't solve...

    190620-1654 EDT

    Jon456:

    The NEC can't solve your problem.

    Do analysis and discuss the problem with the customer.

    I my kitchen I have 8 20 A circuits. Yet I have a problem. The one...
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    23$$
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    1,179

    190620-0925 EDT The invention of the concept...

    190620-0925 EDT

    The invention of the concept of phasors to do AC calculations on steady state AC sine waves was by Steinmetz of General Electric late 1800s. See...
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    23$$
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    1,179

    190619-2143 EDT Thesparky: The constant...

    190619-2143 EDT

    Thesparky:

    The constant 1.732 is based on phasor analysis (vectors), and some assumptions.

    Assumptions:
    3 phase supply.
    All waveforms are pure sine waves, no harmonics....
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    4$$
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    190619-2116 EDT garrisonm1: Your 1 minute...

    190619-2116 EDT

    garrisonm1:

    Your 1 minute time constant implies a high resistance joint in a supply wire, and that after this time period the loose joint warms up enough to become a low...
  17. Thread: LED color quality

    by gar
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    0$$
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    228

    LED color quality

    190619-0738 EDT

    A very interesting discussion on the subject of LED color output ---
    ...
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    17$$
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    786

    190618-1740 EDT synchro: Thanks for the...

    190618-1740 EDT

    synchro:

    Thanks for the reference. A very good read.

    .
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    17$$
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    786

    190618-0825 EDT When I made the first post my...

    190618-0825 EDT

    When I made the first post my goal had been to find out what voltage was used in telegraph circuits. The link in that first post did not provide the answer, but the link was...
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    17$$
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    786

    An interesting story

    190617-2501 EDT

    See https://en.wikipedia.org/wiki/Electrical_telegraph

    Many interesting things have been invented since George Washington's time.

    .
  21. Thread: DC GENERATOR

    by gar
    Replies
    17$$
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    936

    190617-1254 EDT On the invention of the...

    190617-1254 EDT

    On the invention of the automotive voltage regulator see ---
    https://ethw.org/First-Hand:The_Story_of_the_Automobile_Voltage_Regulator

    My classmate's father invented a means of...
  22. Thread: POCO issue or not?

    by gar
    Replies
    22$$
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    1,096

    190616-2132 EDT With most areas now having...

    190616-2132 EDT

    With most areas now having smart meters installed, and assuming that the power company can get voltage information from the meters, then it should be possible to get some remote...
  23. Thread: POCO issue or not?

    by gar
    Replies
    22$$
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    1,096

    190615-2216 EDT Consider the general concept...

    190615-2216 EDT

    Consider the general concept of a voltage regulator.

    This a device that in some way can adjust its output voltage based upon the measured output voltage at some output point....
  24. 190615-2007 EDT sengineer101: Consider the...

    190615-2007 EDT

    sengineer101:

    Consider the following question, and if you desire to analyze it, then provide all details on your analysis.

    A Simpson 260 or 270 meter is a Weston D'Arsonval...
  25. Thread: POCO issue or not?

    by gar
    Replies
    22$$
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    1,096

    190514-1425 EDT FionaZuppa: On the surface...

    190514-1425 EDT

    FionaZuppa:

    On the surface the power company plot does not show a problem, but their averaging time per point may be too long.

    You will need to run your own tests.

    My...
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