said by nunya:I put all mine ground down. They were that way before. Lots of stuff has the cord the "proper" way only with ground down. NEC says nothing about it? Works for me.
I think it depends on the situation. In one particular municipality I work, they put it in writing - ground up in commercial and industrial occupancies. No exceptions.
There's nothing in the code about it, and there's nothing in the UL listing or the manufacturers instructions. It all comes down to personal preference.
My folks built a new house several years ago. I wasn't close enough at the time to wire it for them. The electrician put all the outlets in upside down, and my mom did nothing but gripe about it after they moved in.
I've found that most appliances and devices are designed for the outlets to be right-side-up (cord plugs, nightlights, air fresheners, etc...). It can be a little frustrating with the outlets upside down. Plus, most people are just used to seeing the outlets right-side-up. People are creatures of habit.
IMPO, there really is no right or wrong way. The person who lives with it should make the choice.