Hello Trumpy, and welcome to ECN!
American wye/star commercial systems are commonly 120/208V or 277/480V. They also have 240V and 480V delta supplies.
One strange system (from a non-American's point of view) is the 4-wire delta with high-leg. It's basically a 240V delta system but with the mid-point of one winding earthed. The arrangement allows for connection of 120V equipment on two of the phases, but the third phase ends up at 208V to ground. Nothing like it in this part of the world.
On grounding/earthing arrangement, the U.S. bonds the installation earth to the incoming neutral, like the your MEN system or the British equivalent, PME. They don't earth to just a local rod as is done in some parts of the world.
Re switched outlets, it seems to be mostly British-influenced countries that use them, such as Ireland, Australia, parts of Africa, etc. They're not common in the Americas or in Continental Europe either.
