Disconnecting means for power filter feeding a SCIF

Merry Christmas
Is a disconnecting means required for a power filter located in a SCIF ? I currently have no room to mount a 400a disconnect inside SCIF near power filter: I thought there was an exception somewhere that says I can put a plaque showing where disconnecting means is ?
 
it’s pretty much a room inside of a room that’s shielded with foil so no signals can go in or out. But yes it’s a sensitive compartment information facility.
 
Dont think we ever put them on ours. It just a filter in a feeder. Would think tutrning off the source feeder would be sufficient. You rarely mess with these unless they fail a test and show RF leaking out.
 
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