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Vault/Secure Room Storage Standards - Automated Entry Control System (AECS) Transmission Line Security: AECS Transmission lines traversing an uncontrolled area (not within at least a Secret Controlled Access Area (CAA) ) shall use line supervision OR Electrical, mechanical, or electromechanical access control devices, which do not constitute an AECS that are used to control access during duty hours must have all electrical components, that traverse outside minimally a Secret Controlled Access Area (CAA), secured within conduit.

An XCCDF Rule