Technical Specification - UNDP

Fifteen)
Sealing & Drumming of Cables
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Before dispatch, the manufacturer shall cap the ends of all cables so as to form
a seal to prevent the ingress of water during transportation and installation.
All cables shall be delivered to site with the manufacturer's seals, labels or
other proof of origin intact.The labels and seals shall be retained for inspection
by the Engineer.
Each drum length of cable shall be allotted a distinctive and separate reference
number. This number shall appear on the Test Sheets covering the respective
length of cable and shall also be clearly marked on the cable drum. All cables
shall be capped on the drum to prevent the ingress of water.
16.3 Cable Installation
1- General
One) The arrangements of cables and all methods of installation shall be subject to
approval by the Engineer.
Two) Cables shall be installed in one length from terminal point to terminal point.
The radius of each bend or change in direction of the route of any cable shall
not be less than the IEE Regulations, the relevant BS specifications, or the
cable manufacturer's recommendations, whichever is the greater.
Three) Multi-core cables carrying alternating current for three phase working shall be
laid strictly in accordance with the IEE Regulations.
Four) The Contractor shall lay in the trench along with the power cable a single core
copper earthing cable of not less than 16 sq.mm diameter for 4x16, 4x25 and
4x35 sq.mm dia, 25 sq.mm for 4x50 sq.mm dia and 35 sq.mm for 4x70 sq.mm
dia power cables respectively. The earthing cable shall run all the way from
the feeder pillar to the last column on each circuit. Looping of the earthing
cable shall be made inside each column.
2- Cables Laid Directly in the Ground
One)
Two)
Three)
Four)
The Contractor shall excavate trenches along approved cable routes to the
minimum depths shown on the detailed drawings.
All loose rock, stones and other sharp materials shall be removed from the
trench.
The Contractor shall supply washed sieved sand and cable warning tapes. He
shall supply and lay these materials along the trench route as specified in the
drawings.
The Contractor shall lay, level and compact clean sand in the bottom of the
trench to a depth of 75 mm before laying the cables. After laying the cables he
shall then cover them with a further 75 mm of clean sand, level and compact.
The backfilling of the trench, including the laying of PVC warning tape, shall
then be completed in accordance with the specifications.
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