John, you ask " If I look at the breakers or sub panel I see things like "rated for 120/240 VAC and 10,000 AIR" But I do not know what 10,000 AIR means
At our facility I had occasion to deal with that issue. Breakers are rated according to the maximum level of current they can interrupt and that's referred to as the interrupting rating or Ampere Interrupting Rating (AIR).
In order to determine just what AIR we required, we had to perform a complicated set of calculations to determine the absolute maximum short circuit current that could be supplied from whatever substation that supplied service to the building. Even at the first building closest to a sub station we found the max short circuit current was way under 8,000 amps. THEREFORE the standard AIC rating of 10,000 amperes breakers were just fine. If you are located close to a sub station with big enough wire of low enough impedance there could be more then 10,000 amps of short circuit current available and you would need a higher AIC breaker, but at our huge military industrial complex NOWHERE did our short circuit current capacity exceed 10,000 amps.
Without going into all the exact details, Id rather err on the side of safety and allow room for future expansion then to design a marginal distribution system BUT HEY ITS YOUR MONEY AND DECISION NOT OURS TO MAKE
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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