Siemens BH17 7ER - Feeder Cable Slot Details and Backfilling

LOOP DETECTOR HANDBOOK
667/HE/20663/000 Issue 13 Page 17
The feeder cable is supplied with 1.5 mm
2
or 2.5 mm
2
copper conductors and
may be manufactured with or without steel wire armour to meet customer
specification. The referred types are 1 or 2 pair non-armoured cables with 1.5
mm
2
conductors and an orange coloured outer covering. Armoured cable, also
orange coloured and with 1.5 mm
2
conductors, is recommended where the
joint between loop tails and feeder cable is made in the road, or where ducts
do not protect cables.
It is most important that the 2 cores of each pair are identified and correctly
connected. With 2 pair Quad cable, opposite cores always form a pair. (Red is
opposite blue and yellow is opposite black). With 3 and 4 pair cable the pairs
are twisted and it is not possible to identify pairs by colours alone.
The feeder must be joined to the loop ends using crimp connectors encased
in an appropriate joint box. The crimp connectors must be suitable for joining
1.5 mm
2
/ 2.5 mm
2
solid copper feeder cable conductors to 1.5 mm
2
/ 2.5 mm
2
stranded loop conductors.
The feeder cable codes are as follows:
1.5 mm
2
Plain cable 1.5 mm
2
Armoured cable
1 pair 998/4/85263/900 998/4/85263/000
2 pairs 998/4/85263/901 998/4/85263/001
The following 2.5 mm
2
cables are no longer recommended but are listed here
for completeness:
2.5 mm
2
Plain cable 2.5 mm
2
Armoured cable
1 pair 667/4/03082/900 667/4/03082/000
2 pairs 667/4/03082/901 667/4/03082/001
3 pairs 667/4/03082/902 667/4/03082/002
4 pairs 667/4/03082/903 667/4/03082/003
2.8 Feeder Cable Slot Details and Backfilling
Feeder cable slots will be cut in the surface of the roadway using a motor
driven saw.
Slots must be cut at least 2 mm wider than the cable being installed and deep
enough to allow 65 mm of cover.
The minimum slot widths are as follows:
1.5 mm
2
plain cable 1.5 mm
2
armoured cable
1 pair 10mm 14mm
2 pairs 12mm 16mm
2.5 mm
2
plain cable 2.5 mm
2
armoured cable
1 pair 12mm 16mm
2 pairs 14mm 18mm
3 pairs 18mm 22mm
4 pairs 20mm 24mm