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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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