Question on EMI - 6509's

[news2010a]

Imagine I need to place 6509 switches in a MDF room which is 20 ft. away from a 480V transformer.

Which is level of EMI a network switch like that can handle? Any ideas on how to I determine whether the transformer is in fact could cause EMI and interfere with the switches?

[sadbulali]

The Catalyst 6500 series chassis has an EMI gasket on top of the frame member above the power supply, and each module has an EMI gasket on the top of its faceplate. (Blank slot covers also have EMI gaskets.) These EMI gaskets must contact the adjacent module to be effective. The EMI gasket is made from a flat spring material, folded and cut so that it looks like many parallel strips across the top of the faceplate.