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<font size=3>Friend:<br><br>
Thanks for the responses. They have all been valid on offered good
options. There is one possible solution that will be easier to
implement and is worth a brief description here:<br><br>
Breakers have an AIC (Ampere Interrupting Capacity). This is a
quantification of how much fault current a breaker can handle before it
explodes (in lay terms). Residential AC power distribution drops
have a finite ampacity under short circuit capability. Sure, you
drop a wrench across a bus expect a lot of amps to flow until your main
opens. A higher amperage commercial service can deliver more
instantaneous amps, so a breaker with a higher AIC is required in
commercial applications. Typical values are 10,000, 22,000 and
65,000. The lower values are found on garden variety
breakers.<br><br>
I have learned that the higher AIC breakers also have a higher
"instantaneous trip" value. A Siemens 2 pole 100 amp
breaker with a10,000 AIC rating has a 600-900 amps instantaneous
rating. The same breaker with a 22,000 AIC rating has a rating of
rating of 1,000 -1,2000 instantaneous amps.<br><br>
I am thinking that the higher instantaneous rating my prevent nuisance
trips. My supplier has asked Siemens to comment but we receive a
very non-committal answer. My supplier has offered to sell me
breakers with the higher AIC and accept them back if they don't solve the
problem. That is the direction and I will report back.<br><br>
Thanks again. I hope this exchange was beneficial for many of you
and prevents some of you from repeating my mistakes.<br><br>
William Miller<br>
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