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2.6
Cable Laying and Slot Backfilling Procedures
2.6.1 Loop Cable Laying
The loop cable should be dry. Loops are laid starting at the kerb, running the
tails out winding the loop and returning via the same slot to the kerb. When
winding a multiple diamond loop, the cables must cross at the point where the
diamonds meet. When loops are connected to feeder cable in the crown of
the road, loops are laid starting at and returning to the crown of the road. It is
acceptable to run short lengths of loops cable pairs taped together in the soil
under the pavement or grass verge but the run should be kept as short as
possible and should not exceed 4.5 m. When longer runs are required, feeder
cables part no. 667/4/03082/etc must be used (See Section 2.7).
When a pair of tails run inside the detector pedestal or controller case they
should be taped or tied together at 100 mm spacing.
The free ends should be labelled with the loop identity using Hellerman HC7
sleeving.
2.6.2 Slots Containing Loop Cable
Slots must be backfilled immediately following the laying of cables. The
backfill of loops in the United Kingdom consists of two different techniques:
i)
Complete cover of the loop cable with dry sand to a depth of 6mm to
12mm and backfilling of the slot by hotpour bitumen.
ii)
A 10 mm cover of cables by a two-part epoxy resin, and remaining slot
backfill completed by hotpour bitumen. Note that the loop cable must
be dry as the resin will not bond to wet plastic.
Two part epoxy resins and approved hot pour bitumen are listed in section
2.6.3
Prior to backfill of slots, refer to customer's instructions for preferred backfill.
2.6.3 Suppliers for Resins and Compounds
1) PX212ZE
Robnorganic Systems Ltd.
Highworth Road,
South Marsten,
Swindon,
Wilts.
2) CALKTITE COLDPOUR LSM/3O
(new improved grade)
Sealocrete PLA Ltd.,
Greenfield Lane,
Rochdale,
OL11 2LD
667/HE/20663/000
Epoxy Materials
Issue 13
L
D
H
OOP
ETECTOR
ANDBOOK
Page 15
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