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Type: Posts; User: jim dungar

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  1. Replies
    5$$
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    108

    If you can touch it at all, it is not...

    If you can touch it at all, it is not overheating.
    The center, internal areas, of the transformer is rated for 150C over a 40C ambient.
  2. Replies
    5$$
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    108

    There is no way to know that the transformer is...

    There is no way to know that the transformer is putting out too much heat without using a thermometer.
    For a transformer, like your, I wold expect that it feel like a space heater.
  3. Replies
    5$$
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    108

    The secondary is a center tapped 240/120V delta....

    The secondary is a center tapped 240/120V delta. The nominal voltage for L2 would be 208V, so 213 looks okay.
  4. Replies
    12$$
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    395

    As I remember, all UL 489 Listed multi-pole...

    As I remember, all UL 489 Listed multi-pole breakers have been tested with fewer than all poles being loaded (i.e. 2-pole as 1-pole, and 3-pole as both 2-pole and 1-pole).
  5. Replies
    16$$
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    669

    You need to be very careful with your...

    You need to be very careful with your terminology. There are several things that need to be considered and they all sound similar, partly because they are all expressed in thousands of Amps,...
  6. Replies
    6$$
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    408

    Why would we assume that any AHJ that does...

    Why would we assume that any AHJ that does installation inspections would know anything at all about safe work practices?
  7. The cover is there to prevent access to internal...

    The cover is there to prevent access to internal components such as energized parts. The thickness of the cover has to door with its structural integrity. a 12"h x 15"w MCC bucket door does not need...
  8. Replies
    28$$
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    1,295

    My family says they would rather live without...

    My family says they would rather live without electricity than without me.
    I have been turning my home panel off for the past 30 yrs (or at least since I got battery power tools).
  9. So it was an improperly applied (under rated)...

    So it was an improperly applied (under rated) breaker that exploded, not simply a door failing during an arcing fault event.
  10. Replies
    55$$
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    2,205

    You are mistaken. Fuse performance is all...

    You are mistaken.

    Fuse performance is all about the amount of current flowing in the fault. Not all fuse openings result in true current limiting.
    Circuit breaker also exhibit current limiting...
  11. Replies
    55$$
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    2,205

    Not necessarily. Fuses are often only faster in...

    Not necessarily.
    Fuses are often only faster in their current limiting region. Current limiting often only occurs at fault currents in excess of 10 times the fuse rating. Thermal magnetic breaker...
  12. Replies
    55$$
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    2,205

    Some manufacturers use a common linkage, but many...

    Some manufacturers use a common linkage, but many do not. It depends on the internal mechanism and the layout of the breaker inside. Sometimes there is no physical room for a common linkage.
    All of...
  13. Replies
    55$$
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    2,205

    Correct.

    Correct.
  14. Replies
    55$$
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    2,205

    They are not potentiometers. They are dials on...

    They are not potentiometers. They are dials on the ends of screws that move the parts that make up the magnetic trip assembly. They increase the air gap which means the breaker can tolerate more...
  15. It sounds like the fasteners failed. Did the door...

    It sounds like the fasteners failed. Did the door turn into shrapnel?
  16. Replies
    4$$
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    283

    IIRC The HomeLine panel was designed and built...

    IIRC
    The HomeLine panel was designed and built after the CTL rating/requirement (roughly the early 60's) went into effect and all HOM panels are rated for tandems in all slots, therefore there was...
  17. Replies
    18$$
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    807

    An open delta can supply at least 6 different...

    An open delta can supply at least 6 different systems:
    240/120V 3PH 4W center-tapped
    240V 3PH 3W corner grounded
    240V 3PH 3W ungrounded
    480/240V 3Ph 4W center-tapped
    480V corner grounded
    480V...
  18. Replies
    18$$
    Views
    807

    Technically you have a center tapped delta, also...

    Technically you have a center tapped delta, also referred to as a wild or high leg. The ANSI method of identifying this is to show it as 240/120V, although I prefer to add 3 phase 4 wire to the...
  19. Arc flash PPE is rated in Arc Thermal Performance...

    Arc flash PPE is rated in Arc Thermal Performance Value (ATPV) which is in the units of cal/cm2. Effectively, this is the amount of heat that can be absorbed by the PPE while allowing about 1.2...
  20. I would not typically use an open delta...

    I would not typically use an open delta configuration with windings on a common core.

    I would think they should have a jumper from H6-H1, but then I haven't seen the wiring diagram, which should...
  21. The windings appear to be between H1->H2, H3->H4,...

    The windings appear to be between H1->H2, H3->H4, and H5->H6.

    It seems to be connected in a wye.
    It looks like there is a jumper from H1-H3 and from H3-H5.
    The load conductors are on H2, H4, and...
  22. Re-connectable wye-delta transformers are not...

    Re-connectable wye-delta transformers are not uncommon. What are all of the connections as shown on the nameplate?
    You did not mention any jumpers for either H1 or H6
  23. There is no industry standard methodology for...

    There is no industry standard methodology for calculating arc blast. Arc blast and arc flash incident energy are not directly correlated. High arc flash incident energy is often associated with arcs...
  24. Replies
    55$$
    Views
    2,205

    The screws provide access into the breaker case,...

    The screws provide access into the breaker case, for the addition of accessories like shunt trip and auxiliary contacts.

    There are no electronics in that particular Square D breaker, but it is no...
  25. with my local utilities, I have always used a...

    with my local utilities, I have always used a ball park of 1 ring =5kV to ground on systems 24.9kV L-L and higher. But there are usually too many variable for this to be used universally.
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