Ducting to the building
Duct to the premises/building must be laid at
a minimum depth of 350mm and be as straight
as possible.
The latest information on the positioning
of utilities, mains and plant can be
obtained from the National Joint Utilities
Group: www.njug.org.uk
Please note
Ducting general principles
• All runs shall be laid as straight as possible.
If needed, you can carefully bend the
ducts or use pre-formed bends supplied by
Openreach.
• There shall be no more than one pre-formed
90° bend in any single run of duct.
• Pre-formed 90° bends shall not be installed in
any duct linking two joint boxes.
• Footpath or service strip ducting must be laid
at 350mm depth of cover.
• All space alongside the duct must be
backlled with granular ll to a minimum
thickness of 75mm.
• For all Single Dwelling Units (SDU) duct
must be terminated on the external surface
of the property.
• The duct termination point shall be in a
location that will allow unrestricted access for
any future maintenance activity.
• All ducts must be provided with a draw rope
after installation, unless it’s agreed locally to
substitute the draw rope with a cable.
• Please notify your FBC when the duct has
been laid and is ready for inspection.
Commercial unit ducting
• 90mm duct can be laid either externally or
internally to the building, with 45 degree
angled bend.
• If internally then the duct should be sealed
once cabling is complete – the FBC will
provide this as a stores item.
• The termination point on a large
commercial unit within a commercial only
site should be located within 10m of the
entry point.
Duct laying
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