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Also, i was looking at some of the US Boxes, and could not see a ground bar in them. Do you have to tie your grounds to the box?
Yes, but it's achieved by simply connecting one of the grounding conductors to a screw in the back of the box.

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Even the plastic ones here have a metal strip that we have to ground, and it goes to the screw hole where the device is mounted in.
The US solution: say hello to Mr. Wirenut. [Linked Image]

-George