Posted by John M on June 14, 2016 at 05:49:59 from (104.129.204.55):
Im not electrician, so bare with me. Here at work, we have one warehouse that has to maintain 60 degrees year round. To do this we have a total of 4 chiller units. 2 are more or less back up, and had seldom came on except on very hot days. They are older units that work, but cant keep up with 60 degrees. 2 bigger units were installed in the 70s, and one has just been replaced with a new outside unit and air handler. The other has had the outside unit replaced both within the last 2 years. Now, the older units are on a seperate transformer outside from the new units. No issues there, but the new units heat up the main breaker inside to the point it trips. Old units have line from the transformer, to meter base, to inside breaker, and from there to each unit, where it has its own breaker for both inside and outside units. The new ones, well, heres the point ofthe post. The guy who installed the new units came by to check the untis, and determined the source of the heat in the breaker was from the fact the new units pulled more amps, and possibly the age of the breaker as well, is whats causing it to trip. So he was going to install a new breaker inside. He pulled the meter outside, checked for power and there was still power to the breaker. Heres what he found: The lines from the transformer go to the building, there is some type of setup attached to the outside wall of the building that has 3 "blocks" for a lack of a better word, that has a hole in the center of each block. The wire wraps around the blocks going through the hole in each, then comes to the inside breaker. From the bottom of the breaker, 3 wires go to meter base, and from there to the chiller units, where each has its own breaker for each unit. Boss said the original units were installed in the 70s, and as far as he knew, no other work has been done or needed. So finally my question: Why would the "hot" wires from the transformer been connected directly to the breaker?
(If I could post pics from work I would. I may try this evening from home.)
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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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