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Table 1
	Considerations
History	History and performance of the proposed cable type in similar installations. Compatibility with other cables in service.
Inspectorate Requirements	Acceptance by regulatory authorities. Industry codes of practice may govern and control acceptable cables.
Future Developments	Upgrading and expansion of systems at a future date. Bandwidth may need attention. Future integration with other building/management systems and networks.
Power Requirements	Cater for power loss in long runs and attenuation (reduction in signal strength at a specific frequency). Estimates to be made for length of cable runs.
Bandwidth	Selected cable needs an acceptable bandwidth to satisfy the rate of data transmission.
External Fields	Need for shielding and twisted pair. Possibility of electrical interference being induced by other building services. Process generating electrostatic discharges and inductive loads needs attention.
Mechanical Protection	Cable may need a special sheath to suit the environment. Containments such as conduits/trunking may need to be applied. Cable may need additional measures to combat tampering.