what does resistance have to do with grounding?

[freeradical]

[quote Caroline]Hey guys,

I've grounded the power supply to a painted metal housing that sits on the rack.

Caroline
It should be grounded to bare metal. I'd ground the chassis of each piece of equipment to the same common ground.

Something like this will tell you if your wall outlet is correctly wired.

http://www.tripplite.com/products/static/ct120.cfm