These requirements apply to the construction@ performance@ and operation of systems intended to regulate or control:a) Entry into an area orb) Access to or the use of a device(s) by electrical@ electronic or mechanical means.These requirements apply to computer equipment that@ when used in conjunction with the main control@ is necessary for proper operation of the access control system. This Standard does not apply to supplementary computer equipment that is not necessary for operation of the access control system if single opens@ earth ground faults or wire-to-wire shorts on the circuit connection from the computer to the access control system does not inhibit intended operation.