APPENDIX A (NORMATIVE) PHYSICAL CONTROLS, continued Minimal (All Mandatory) Working in secure areas Public access, delivery and loading areas • Access to delivery and loading area from outside of zone restricted to authorised & identified personnel Control Class • External doors to delivery/loading area secured when any internal door is open • Incoming material is registered and inspected for potential threats Equipment siting and protection • Guidelines for eating, drinking and smoking in proximity to information processing facilities should be established • Lightening/spike protection should be applied to all buildings to all incoming power and communications lines Supporting utilities Cabling security • Power and telecommunications lines into information processing facilities should be underground or subject to adequate alternative protection • Network cabling should be protected from unauthorised interception or damage NATIONAL INFORMATION ASSURANCE MANUAL 50