In Canada, I've frequently seen outlets installed ground up: usually in newer buildings and more often in commercial buildings than residences. I have been told

In Canada, I've frequently seen outlets installed ground up: usually in newer buildings and more often in commercial buildings than residences. I have been told that ground up is the "correct" way, but I am not trained as an electrician. EDIT: Upon googling, I can find lots of conflicting opinions, but it appears that the electrical code has nothing to say about it. They can be installed in any orientation: ground up, down, or sideways.