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| cable route marker |
Cable route
Before the cable
laying work is undertaken, the route of the cable shall be decided by site/project
Engineer considering the following-
(i) While the
shortest practicable route should be preferred, the cable route shall generally
follow fixed developments such as roads, foot paths etc. with proper offsets so
that future maintenance, identification etc. are rendered easy. Cross country
run merely to shorten the route length shall not be adopted.
(ii) Cable route
shall be planned away from drains and near the property, especially in the case
of LV/MV cables, subject to any special local requirements that may have to be
necessarily complied with.
(iii) As far as
possible, the alignment of the cable route shall be decided after taking into
consideration the present and likely future requirements of other services including
cables in route, possibility of widening of roads/lanes etc.
(iv) Corrosive
soils, ground surrounding sewage effluent etc. shall be avoided for the routes.
Route of cables
of different voltages.
(a) Whenever
cables are laid along well demarcated or established roads, the LV/MV cables shall
be laid farther from the kerb line than HV cables.
(b) Cables of
different voltages, and also power and control cables shall be kept in
different trenches with adequate separation. Where available space is
restricted such that this requirement cannot be met, LV/MV cables shall
be laid above HV cables.
(c) Where cables
cross one another, the cable of higher voltage shall be laid at a lower level
than the cable of lower voltage.
(d) Cable Route Marker
shall be min 0.5meter away from cable trench
Route markers
Location:
Route markers should be provided along with the runs of cable allocations
approved by the site Engineer and generally at intervals not exceeding 30m.
Markers shall also be provided to identify change in the direction of the cable
route and locations of underground joints.
MATERIAL
·
Aluminium
·
Cast Iron Material with Standard or
Custom design
·
Fibreglass Reinforced Plastic [FRP]
GREADE : Fire Retardant
COLOUR : Red/yellow /white
Typical
Size:
Dia
150mm, thick -8mm, length 0.6m -1.5m
Dimensions:
150mm x 100mm x 1.5m long
Dimensions:
150mm x 75mm x 1.3m long
a) Plate type marker: Route markers shall be made out of
100 mm x 5 mm G.I./aluminium plate welded / bolted on 35 mm x 35 mm x 6 mm
angel iron, 60 cm long. Such plate markers shall be mounted parallel to and at
about 0.5 m away from the edge of the trench.
c) CC marker: Alternatively, cement
concrete 1:2:4 (1 cement: 2 coarse sand: 4 graded stone aggregate of 20 mm in
size) shall be laid flat and cantered over the cable. The concrete markers,
unless otherwise instructed by the site engineer, shall project over the
surrounding surface so as to make the cable route easily identifiable.
d) Inscription: The LT / HV CABLE as the
case may be shall be inscribed on the marker.
Precast Concrete Markers and Protection Slabs
Precast Concrete
Protectors are used on top of vulnerable cables, conduits, ducts and pipes to
protect them against accidental mechanical damage. Concrete is maintenance
free, inexpensive and strong, save the frustration of locating underground
services or worse, accidental damage to service.
Book reference :A practical guide to cable installation and tool box talk
Available with book shop and -
Price: Rs. 375/- excluding delivery charges
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