The trenchless techniques after consulting the relevant institutions are only allowed by
Regulatory Authority for road crossing FOC installation. The installation of optical cables
inside sewer ducts is compulsory wherever the ducts are available.
For the use of inside sewer ducts, the sewer assessment is much needed and the following
information shall escort the permit application:
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Applicable sewer pipe diameter;
Position in the sewer;
Maintenance feasibility of the sewer;
Risk of blockage;
Upgrading of the optical network;
Maximum number of cables and fibres;
Flexibility of the optical network;
Access to optical network;
Cable type;
Other technique than the installation of optical cables inside sewer ducts agreed by
Regulatory Authority for road crossing is drilling technique which is allowed to be used in
absence of constructed ducts.
In case of impossible crossing with trenchless techniques due to the soil condition that avoids
the use of guided boring/directional drilling machine; the special request for road crossing by
digging shall be sent to the Regulatory Authority, who will assess and provide the feedback
based on case specifications.
III.3.8: Trenchless Guidance
Any person conducting trenchless excavation shall take all reasonable steps necessary to
protect and support underground utility lines. These steps shall include, but are not limited to
the following:
– The excavator should verify that all utility lines in the area are marked;
– The excavator shall ensure that bore equipment stakes are installed at a safe distance
from marked utility lines;
– The excavator shall ensure that sufficient clearance is maintained between the bore
path and any underground utility lines during pullback;
– The excavator shall give special consideration to water, electricity and sewer systems
within the area that cannot be located accurately;
– The excavator shall ensure that the drill head locating device is functioning properly
and within its specification.
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