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 Utility tunnels should be equipped with fire detection and alarm systems

 Firewalls may be required to isolate sections of the tunnel during a fire event, as per the local
authority requirements

 Tunnels should include an emergency escape
 Wet utilities tunnels should include floor drains draining into a sump.
 Tunnels should include a closed‐circuit TV system

 Tunnels should be equipped with a gantry for lifting heavy equipment, such as valves.

Figure 7 – Example of heavy lifting equipment
[Source: Abu Dhabi Utility Corridors Design Manual, b‐1]

 The utility tunnels should support their own weight as well as the weight of all installed
equipment in (or on) the structures. The utility tunnels should support the weight and forces of
all movable and active components and systems in (or on) the structures. For example, the steel
cable trays should be able to carry the weight of the proposed number of cables

 Utility pipes and cables should be secured and fixed in their locations in the tunnel; for example,
cables should be supported with cable cleats every 1.0 – 1.5 m
 Optical fibre and electrical cables need to be protected against rodents chewing the PVC. Some
cables are specified to be rodent resistant.

398 ITU‐T's Technical Reports and Specifications