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    10$$
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    191

    141001-2203 EDT SceneryDriver: Your...

    141001-2203 EDT

    SceneryDriver:

    Your discussion was good, but I have some slight differencies of perspective,

    RS-485 is only a three wire system because of the physical limitations of...
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    10$$
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    141001-1933 EDT fifty60: This is in...

    141001-1933 EDT

    fifty60:

    This is in response to your last post.

    To a large extent I assume that you have one-way communication from what you call a controller to a PLC, or possibly the other...
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    10$$
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    191

    141001-1354 EDT fifty60: Think about your...

    141001-1354 EDT

    fifty60:

    Think about your shield question. Why would you want to float the shield?

    It is my opinion that the shield should be connected to the RS-485 common of the most...
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    10$$
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    191

    141001-1336 EDT GoldDigger: There is no...

    141001-1336 EDT

    GoldDigger:

    There is no real problem doing half-duplex with a wire pair. In fact this is what the Dallas 1-wire system does and they can also supply DC power with the same wire...
  5. 141001-0852 EDT ritelec: I made an error in...

    141001-0852 EDT

    ritelec:

    I made an error in reading my resistance table. I read the #10 value which is 0.9989 ohms/1000 ft at 20 C.

    My reference is "Reference Data for Radio Engineers",...
  6. 140930-2119 EDT fmtjfw: Check your wire...

    140930-2119 EDT

    fmtjfw:

    Check your wire resistance source and see what is actually defined. You will find that loop resistance is defined. That is the total resistance of two wires from a...
  7. 140930-1129 EDT ritelec: Funnel is probably...

    140930-1129 EDT

    ritelec:

    Funnel is probably the wrong way to view the problem.

    The resistance of #12 copper wire at 20 C is about 1 ohm per 1000 ft, or 0.001 ohms per foot. So at 20 A the...
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    140926-1307 EDT From...

    140926-1307 EDT

    From http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=2&pid=2&aid=7
    The power capability of North America was 1,253,306 kW in 2011 or1.2 * 10^9 W.

    From...
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    192$$
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    4,665

    140926-0750 EDT I agree with Besoeker that a...

    140926-0750 EDT

    I agree with Besoeker that a watt is an instantaneous unit, voltage, and current are also instantaneous units of measurement.

    An ordinary AC wattmeter does not provide an...
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    6$$
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    324

    140924-1420 EDT fifty60: Has your question...

    140924-1420 EDT

    fifty60:

    Has your question been answered to your satisfaction?

    .
  11. Thread: DTE "Insight"

    by gar
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    109

    DTE "Insight"

    140924-1251 EDT

    Does anyone in the DTE area have a modren i-phone with the "Insight" application loaded, and also possibly the DTE "Bridge"?

    If so are you willing to run some experiments?
    ...
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    6$$
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    328

    140923-1549 EDT Bryan: Thank you for the...

    140923-1549 EDT

    Bryan:

    Thank you for the invitation. I have never been in Flordia. It would be interesting, but the probability is not high.

    I have been in the original Fort Myers Laboratory...
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    6$$
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    324

    140923-1051 EDT fifty60: I think the answer...

    140923-1051 EDT

    fifty60:

    I think the answer is simple.

    You have a delta load that consists of three equal resistors connected in delta.

    From your information the total power is 20000 W....
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    2$$
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    181

    140922-2340 EDT Some is. But we know much more...

    140922-2340 EDT

    Some is. But we know much more about materials and reliability than 50 years ago. Extremely good and reliable equipment can and is being made today.

    But I think in the near term...
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    2$$
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    181

    Old & new equipment

    140922-2219 EDT

    Back in the early 60s I was consulting with a company in the liquid level business. Usable transistors and some other semiconductor devices had only been around for a few years....
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    24$$
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    767

    140922-1329 EDT Another useful calculation to...

    140922-1329 EDT

    Another useful calculation to perform is to assume the open circuit source voltage of my secondary is about 0.0029 V. Then for a wire resistance in the secondary of about...
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    24$$
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    140922-1156 EDT A correction to my post...

    140922-1156 EDT

    A correction to my post numbered 22.

    The statement
    "Sixth, same as fifth except meter input is shunted with 47 ohms. Same result. Secondary current is no greater than 2.9/50...
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    24$$
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    767

    140921-2128 EDT An additional experiment: I...

    140921-2128 EDT

    An additional experiment:

    I cut a 25 ft coil of 14-2 w/g romex in half. The EGCs are left floating. The two pieces are taped together.

    One piece that I shall call the...
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    6$$
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    140921-1642 EDT mgookin: To the best of my...

    140921-1642 EDT

    mgookin:

    To the best of my knowledge Henry Ford never had any contact with Hitler.

    A classmate of mine and his father were in Mr. Ford's office one day in the mid 1930s. I...
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    Water power, Ford, Village Industries

    140921-0819 EDT

    Henry Ford built a number of small plants around the country. Mostly in southern Michigan. Some time back someone on this forum ask a question about water powered homes or...
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    24$$
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    767

    140920-1212 EDT Some experiments: Using a...

    140920-1212 EDT

    Some experiments:

    Using a 250 ft coil of #14 romex with EGC. This was not uncoiled.

    Capacitance @ 1 kHz:
    0.0050 ufd D=0.22 --- Black to white with EGC floating
    0.0066 ufd...
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    24$$
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    767

    140920-114 EDT My guess is still capacitive...

    140920-114 EDT

    My guess is still capacitive coupling from one hot phase to the other hot phase.

    In the original post it is stated that for either breaker, if only one breaker is turned on, then...
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    24$$
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    767

    140920-0912 EDT The word "conduct" in the...

    140920-0912 EDT

    The word "conduct" in the first sentence of my post numbered 11 should be "conductor".

    A long loop consisting of two parallel wires in a cable and an open circuit end, and...
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    24$$
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    767

    140920-0007 EDT cdcengineer: An induced...

    140920-0007 EDT

    cdcengineer:

    An induced voltage will generally mean a voltage generated in a conduct from a change of magnetic flux lines linking the conductor.

    Create two coils of 1 turn...
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    24$$
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    767

    140918-2213 EDT If by induced voltage you mean...

    140918-2213 EDT

    If by induced voltage you mean a magnetically generated voltage or current, then almost certainly it is not.

    Capacitive coupling might be a possibility. 400 ft times 80 pfd per...
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