NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Premoulded refers to moulded Ethylene Propylene Diene monomer rubber components.
Sealing between the pre-moulded
moulded push on material and cable surface shall be achieved by
semi conducting pad which has cold fflow
properties.
Cable trays
All the cable trays shall be prefabricated hot dip galvanised sheet steel trays.
Prefabricated GI ladder type / perforated type cable racks/trays shall be used for laying of
cables in cable trenches, cable spreader floors, cable cellers, through piping and while routing
cables along technological structures etc. The factory made system of cable trays shall be
complete in all respects with all standard accessories like reducers, bends, tees, risers etc. and
shall be suitable for bolted type assembly at site so as to avoid any welding.
The GI ladder type factory fabricated cable trays mmade
ade from 2.5 mm thick hot welded steel
sheets grade ‘o’ shall be provided as per IS : 2062. Hot dip galvanizing of 86 micron thick as per
IS-2629, IS-4759 and IS- 209. Trays shall be of standard length of 3 M / 2.5 M with max
deflection not exceeding 1/400 of span with sufficient load bearing capacity.
Sheet steel thickness shall be minimum 2.5 mm. Rung hall be provided at every 250 mm. At
one meter interval two rungs shall be provided side by side to facilitate clamping. Beside,
Bidder shall also provide suitable pre pre-fabricated fabricated bends of cable trays at all the bending points
as per actual site requirement.
Horizontal tees and 900 bends shall be provided for each size of cable trays as per actual
requirement at site.
Lugs/connectors
Cable termination shall hall be made with aluminium / tinned copper crimped type solderless lugs
of approved make for all aluminium conductor and stud type terminals. The lugs shall be
tinned copper compression type.
Glands
Cable glands to be supplied shall be nickel plated br brass ass double compression type. Glands for
classified hazardous areas shall be certified by CMRS and approved by CCE, Nagpur.
Cable glands for terminating PVC insulated armoured/unarmoured cables (as applicable) shall
be made of brass and shall be of double compression type with necessary provision for armour
earthing.
Cable clamps
All cables shall be clamped with GI (minimum size of 25x3mm) / Al (minimum size of 25x4)
clamps and single core cables shall be clamped with trefoil clamps made of non non-magnetic
materials.
Technical Specification:Sec-6, Electrical
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