Sunday, 15 September 2013

cable route marker


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.

·         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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