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Thread: Why do they both trip???

  1. #181
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    Quote Originally Posted by peter d View Post
    We call them "NAC panels" here.
    NAC one brand calls them SNAC.

  2. #182
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    Quote Originally Posted by iwire View Post
    NAC one brand calls them SNAC.
    All true, but no one calls the main fire pump or booster fire pump service a "fire alarm booster panel", "FA supply", or "fire alarm control panel". Not to mention they wouldn't be coming out of a distribution panel in any event.

  3. #183
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    Quote Originally Posted by jim dungar View Post
    Apparently you have not bothered to look up the actual breaker data sheets yourself.
    Magnetic trip only breakers are relatively rare. Magnetic only mounted into standard panelboard construction are extremely rare, and may no longer even exist.
    Apparently you have not read the thread before commenting
    I actually posted the data sheet link in this thread, not clear, but no mention is made of the oc element
    The op said the are sc/instant only, no toc element

    mag only is not uncommon on motor applications
    or fire pumps

    in mining they are the standard and are usually supplemented by an external OL pack



  4. #184
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    Quote Originally Posted by gadfly56 View Post
    If you use that term in conversation with anyone who is familiar with both fire alarm and sprinkler, I'm betting 99 out of a hundred will assume you mean a notification appliance booster power supply. especially since it says "alarm", and the hundredth will ask you to repeat the question.
    disagree
    never heard a fa panel referred to as a 'booster' panel (btw, that word is not used in the panel schedules)
    been to the following schools: Ansul, Fenwal, Kidde, Pyrotonics, Edwards, Honeywell, etc.
    Worked for a firm for 4 years that did a large amount of work with fire/explosion suppression/detection (along with power dist) in the oil fields of Alaska, military facilities, telecomm facilities and Boeing facilities in WA: Seatronics Protection Systems



  5. #185
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    Quote Originally Posted by Ingenieur View Post
    Apparently you have not read the thread before commenting...
    I even went so far as going to a GE website to look at the breaker curve. However before I got to the TCC, the data sheet said this SFLA breaker came with: Trip Function LSI. Designated by the letter T in the part number.
    Just because you can, doesn't mean you should.

  6. #186
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    Quote Originally Posted by Ingenieur View Post
    Pg 6-47 https://www.geindustrial.com/catalog...eCircBrkrs.pdf

    Instant trip setting range min/max ~300/1000%
    do these have a thermal/toc element?

    Current settings
    200 590
    100 295
    70 ~340

    the 70 likely trips on xfmr inrush, set it 9 x xfmr current 500 A, 700%
    same for the 200 (plus other loads), set at 600% 1200 A
    100, no idea, but setting at 600% or 600 A should be no issue

    most i/t molded case don't get to the instant range 1000-1200 %

    here



  7. #187
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    Quote Originally Posted by Ingenieur View Post
    disagree
    never heard a fa panel referred to as a 'booster' panel (btw, that word is not used in the panel schedules)
    been to the following schools: Ansul, Fenwal, Kidde, Pyrotonics, Edwards, Honeywell, etc.
    Worked for a firm for 4 years that did a large amount of work with fire/explosion suppression/detection (along with power dist) in the oil fields of Alaska, military facilities, telecomm facilities and Boeing facilities in WA: Seatronics Protection Systems
    You probably should drop this and move on. It is not pertinent to the conversation. Furthermore the fact I wrote it gives me 100% confidence it had nothing to do with a motor.

    There are no motor loads.

  8. #188
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    Quote Originally Posted by iwire View Post
    You probably should drop this and move on. It is not pertinent to the conversation. Furthermore the fact I wrote it gives me 100% confidence it had nothing to do with a motor.

    There are no motor loads.
    we should both drop it

    no motor loads anywhere on the system? or only downstream of the subject cb's?
    as many have said:
    turn the breakers up to a more reasonable setting, will not harm a thing since they have oc protection and will still be at a reasonable level (plus it doesn't cost anything but some time)
    who knows what transients/reflections are being generated, on the line or load side

    it sounds like the following has been eliminated:
    cables are sound
    no loads that would cause transients in excess of 300% of the rating
    no correlation to generator transfer
    no oc since loads are << than the setting and hold for days (or longer)

    turning 2 breakers up at a time may isolate the offending circuit

    what else is left?



  9. #189
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    Quote Originally Posted by Ingenieur View Post
    here
    Yes page 6-47 includes the code for the part number.
    Did you look at page 6-91?
    The letter T, in position #8, indicates the breaker has Long time (e.g. thermal) tripping. There would be a letter I here, if this was a Motor Circuit Protector frame for magnetic only protection.
    Just because you can, doesn't mean you should.

  10. #190
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    Quote Originally Posted by kwired View Post
    There is no fault, just a temporary spike in current when that transition is made.
    I if we're being 100% technically correct let's call it a transient.

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