On Sat, 31 Aug 2013 17:05:34 -0700, Nate Nagel
wrote:

...snip...
I've worked in/on places like that, they use fiber for all the comms
that pass through the metal shield. Not sure how they handle the one
big honkin AC power line that by necessity goes through the shield. The
nice lady in the camo uniform wouldn't let me wander off and look at
stuff, although other than that she was friendly and pleasant.

nate

four ways:
1. for 'normal' screen rooms, use tubularly shaped [usually] RFI/EMI AC
line filters
2. for decent separation, use isolation-type transformer with primary on
one side of boundary and secondary on second side of boundary and filter
both boundary and lines to your heart's content.
3. for really extreme, use relatively small diameter, non-conductive shaft
to transfer energy via motor driving a generator. the rod goes through a
tube that is more than twice as long as diameter and get decent shielding.
4. for almost complete, fueled generator, with 'air' flow over broad areas
through those hexagonal [beehive-looking] screen filters