New Connections Mains Trenching

New connections
Mains trenching and cable laying guide
Read this along with the ‘Site information and customer requirements
document’ provided with your build quotation.
All work carried out must be compliant with our technical guidance (TG-PS-881) available from
the SSEN website. It is also recommended that you review the ‘Practical guide to Streetworks’
before undertaking any excavations. Therefore it’s crucial that you contact your Team Manager
to arrange a site visit before you start trenching.
www.ssen.co.uk/CompetitionInConnections/G81Documents/
Practical guide to streetworks
www.gov.uk/government/uploads/system/uploads/attachment_data/file/4382/practicalguidetostreetworks.pdf
Please note: It’s up to you to supply us with finefill material such as builder soft sand (free of
sharp stones and rocks etc) to blind our equipment. You will also be responsible for backfilling
and reinstatement of the trenches, it is recommended that this is completed inline with the
Specification for the Reinstatement of Openings in Highways 3rd edition (SROH 3rd) in all cases
www.gov.uk/government/uploads/system/uploads/attachment_data/file/11042/sroh.pdf
The following trench section shows the position of
cable/duct in the ground. It is important that the top of any
apparatus is at these depths as a minimum, this includes the
top of the duct. In addition to the cable or duct there is a
requirement for 75mm finefill material on all sides. Cable
mark tape or tiels must be installed 150mm above the top of
the apparatus, this needs to have SSEN branding on. This is
available from our approved suppliers. See last page.
Minimum Excavation depth
required = (A) minimum depth
of apparatus + (B) outside
duct/cable size + (C) 75mm of
sand bedding
This table shows the minimum depths to top of
apparatus (A within the diagram above)
Minimum
apparatus
depth
LV cables
11kV cables
33kV cables
Unmade ground,
verges and
Footway (mm)
450
600
800
Carriageway
(Road) (mm)
Agricultural
(mm)
600
750
900
1000
1000
1100
Please note that (M) represents
the cable marker tile (for 33kV
cables) or tape for all other
installations (Please see
TG-PS-881).
Please note: Where there are
sudden changes in surface type
(e.g footway to carriageway),
excavations should always be at
the greater of the depths
required.
New housing service cable installation guide
Experience has shown that by using a service tube the
disturbance to the site is reduced when the supply is
connected. The service tube can be laid in the same
trench as the other services are shown, with an identifying
plastic marker tape installed above, to give advanced
warning of service cable location on private property.
Vector illustration
needed to edit
External meter cabinets
The external meter cabinets must be positioned in
agreement with SSE to provide unrestricted access.
The preformed ‘hockey sticks’ can be installed
either within the cavity or clipped to the outer
surface of the wall below the cabinet. White ‘hockey
sticks’ must be used on the outer surface of walls.
The service tubing must be securely coupled to the
‘hockey sticks’.
Typical cross section
of a service trench
PLASTIC
MARKER
TAPE
300
150
The cabinets are only large enough for our
equipment. You should fit your own main switches
on an inside wall so that the length of
interconnecting cable does not exceed 3m. This
cable must only enter through the bottom of the
cabinet, using the right hand hole, when viewed
from the front.
ELECTRICITY
TELECOM
WATER
GAS
Installation of ducts
For the installation of ducted schemes the use of Black electric
ducts only (see table on last page for approved suppliers) are
permitted for use. You should think about the type of ducts you
plan to use be before ordering as your excavations will be
different depending on which duct supplier you use. You will
also need to review the minimum cable bending radius by
referring to the manufactures specification.
Emtelle supply smooth bore ducts which have rigid preformed
bends at differing angles. It is however important that angles
bends and not placed too close together otherwise pulling
tensions will become greater than the manufactures guidelines
during the installation process.
Bell mouth roller
Winch Cable installation
All cable must be installed not exceeding the manufacture
recommended pulling tensions. You should familiarise
yourself with these loads before hiring the equipment to
ensure that these loads are no exceeded.
For all Cable pull you should have;
•
Winch
•
A display of the pulling tension on the winch
(calibrated)
•
A free moving swivel
•
Rollers (every 4 metres and/or where cable would
come into contact with ground)
•
Cable socking to ensure good grip of cable
In Addition For ducted schemes you will also need;
•
Bell mouth roller
•
Lubricant
•
Cable drum trailer for each drum
For single core cables it’s recommended that you put
colour indicators on each cable.
You will need to securely anchor the drums and the winch
at either end and ensure that the cable does not come into
contact with any thing that can damage the cable sheath.
Approved Suppliers
The following supplier’s materials are approved for use on SSEPD network.
Item
LV Concentric cables
LV Wavecon cables
11kV Three core
cables
Manufacturer
Tratos
Cabelte
Prysmian
Hellenic
Nexans
Prysmian
Manufacturing
location
Notes
UK
Portugal
Wrexham UK
Greece
Hannover,
Germany
Wrexham UK
AL stranded and solid
conductors
Tele-Fonica Kable
Prysmian
Poland
Wrexham UK
Cu or Al Stranded for all
sizes.
Nexans
Hanover, Germany
Solid AL up to and
including 300 mm²
NKT
Tele-Fonica Kable
Prysmian
Cologne, Germany
Nexans
Hanover, Germany
POLYPIPE CIVIL LTD
UK
EMTELLE UK LTD
UK
Cable tile
Cable warning tape
CENTRIFORCE
CENTRIFORCE
UK
Plastic tape tile
CENTRIFORCE
UK
100 mm wide.
when laid by plough
TE Connectivity
UK
Rayflate products
WT Henley
UK
Service ducts (green plastic
compound)
UK
Denso mastic
Denso tape
UK
RISE sealant system
11kV Single core
cables
33kV single core
cables
Cable duct
Duct sealant
Winn & Coates
(Denso)
CSD Sealing System
Poland
Wrexham UK
Cu or Al Stranded for all
sizes or Solid Al up to and
including 300 mm²
UK
Got a question? Contact your Team Manager.
This guide incorporates the NJUG recommendations that Scottish and
Southern Electricity Networks have adopted for ‘Service entries for new
dwellings on residential estates’.
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