I always install them ground down. My son, who's a licensed electrician, always installs them ground up. As far as I know, the NEC doesn't specify the orientation. Could be a recent change, but I doubt the NEC would make it a hard requirement, since almost all appliance cords are designed for ground-down orientation.
I started seeing the "upside down" receptacles on new construction forty years ago, so this isn't a new thing. I'll bet electricians have been debating it since grounded outlets were first introduced.
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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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