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Type: Posts; User: templdl

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  1. Also, would there be a possibility that a smaller...

    Also, would there be a possibility that a smaller conduit could be used with copper conductor since the wire size would be smaller with a given ampacity?
  2. Thread: DC arcs

    by templdl
    Replies
    7$$
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    294

    What is your DC source?

    What is your DC source?
  3. Comparing apples to oranges. This is the way...

    Comparing apples to oranges.
    This is the way that I have looked at it:
    I may assume that what you may be referring to as short circuit current is the "available short circuit current."
    Then the...
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    There must be a reason for asking the quest of...

    There must be a reason for asking the quest of which none was given. Is this a theoretical question or can the OP give an example of an existing product?
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    Ditto. A good description. This was common with...

    Ditto. A good description. This was common with the Westinghouse system. This would be similar to the need to terminate an unused 75ohm TV cable line using a 75ohm resistor to absorb the signal...
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    Please site the code reference. Also, should a...

    Please site the code reference. Also, should a coordination study be done, yes it is possible to find that there may be a reduction in the available fault current. BUT, just anybody can't magically...
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    You must refer to the manufacturer of the panels...

    You must refer to the manufacturer of the panels for series ratings.
    What the manufacture must do to achieve series ratings is to actually test the items is series. If not specifically listed as...
  8. Thread: 400 Hz

    by templdl
    Replies
    6$$
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    While as a beaker applications engineer my...

    While as a beaker applications engineer my application notes indicate in part that a common UL489 breaker requires derating to be applied at 400hz. When installed in a enclosure breakers are to be...
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    You have provided no information on your system...

    You have provided no information on your system nor the breaker itself.
    Yes, 3ph 480v breaker. Is this being applied is a 480y/277 system?
    Do you have an external neutral CT?
    Is there a reason as...
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    The way that I have always viewed motor...

    The way that I have always viewed motor protection has been done with a combination starter. Without being combination tested it's defaut sscr of 5ka or 10ka depending upon the starter size. Remember...
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    In open air the wire is able to dicipate heat...

    In open air the wire is able to dicipate heat where s wire that is not able to the heat escalates because to wire is not able to use the open air around it to radiate heat. 90degC rated wire when...
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    My thoughts are in regard to the space available...

    My thoughts are in regard to the space available in front of the panel as well as how to even find the main disconnecting means if located in a closet.
    I had a surface mount service entrance main...
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    I only sold one large motor, an 800HP wound rotor...

    I only sold one large motor, an 800HP wound rotor type but provided many proposals for others. As I can recall the only standard was that they were designed for one hot and two cold starts per hour...
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    Good point.

    Good point.
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    I find it interesting when I see questions and...

    I find it interesting when I see questions and discussions such as this to just sit back and watch. Your reply is the first one th as t makes sense. Breakers protect wire, wire must be sized to carry...
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    Mine was a duplicate response so it was deleted.

    Mine was a duplicate response so it was deleted.
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    Being that the issue is on the line side of the...

    Being that the issue is on the line side of the breaker it has no reason to trip. The heating is located at loose line aside terminal. My biggest concern is the damage that could have been done to...
  18. Even though I pointed out my concern I have not...

    Even though I pointed out my concern I have not ever received any feedback where stacking transformers was an issue. The installer must be aware the the transformer mounted about would be installed...
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    Measured with a digital meter I would guess....

    Measured with a digital meter I would guess. Digital meters are high. Impedance and will measure a voltage across about anytthing.
    You may want to try a simple analog meter, the one with a...
  20. Simple clearance is one thing but the lower...

    Simple clearance is one thing but the lower transformer will heat the air which will rise to the transformer located about which may cause the transformer located about to run warmer. This may not be...
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    4160 is nothing to screw around with. What...

    4160 is nothing to screw around with. What concerns me is if you have previous experience with work with medium voltage which is a whole different ballgame than working with voltages up to 600v. Do...
  22. Many years ago I have the trigger on my super...

    Many years ago I have the trigger on my super sawsall fail out of warranty. Needles to say I was disappointed. But, I took it in to the Milwaukee repair facility and the fixed it at no charge.
    Even...
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    If I understood you correctly you said " only one...

    If I understood you correctly you said " only one wire." The external neutral current sensor has (2) wires connected to terminals N and G.
    The way the breaker detects a ground fault is knowing that...
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    This is actually A Westinghouse seltronic...

    This is actually A Westinghouse seltronic NCG31200 breaker with 1000a rating plug.
    If you can get a hold of a seltronic test kit, it will test the breaker for you. The serltronic breaker is s "peak...
  25. Replies
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    Go to yhe manufacturers catalog and look for a...

    Go to yhe manufacturers catalog and look for a handle lock-off for hat breaker in the panel. Since it was not specified I am assuming it is a residential load center where a clip type device could be...
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