Foam-skin PE insulated Jelly Filled Local Cables are designed for duct and direct burial installations. Foam-skin insulation – highly expanded foam inner core and solid outer skin – provides the cable with not only compactness but also physical, electrical toughness which yields, combined with the fully filling of cable core with filling compounds, long-term stability after installation. More uniform insulation than conventional ones can be attained by Foam-skin so that electrical couplings will be well reduced. Its construction, physical and electrical characteristics are based on requirements of client’s specification.
Construction & Key Features:
Conductor:Solid annealed copper in size 0.32, 0.4, 0.5, 0.6 and 0.9 mm.
Unit Type: The pairs are stranded to form 25-pair groups (when desired for viagra sans ordonnance lay-up reasons, the 25-pairs groups may be divided into two or more sub-groups), each 25-pair group identified by color coded plastic binders. For large pair count cables, two or more 25-pairs groups are stranded into a super-unit, which is identified by Colored plastic binders. Appropriate number of these groups and/or units are stranded into a Compact and cylindrical cable core.
Core Wrapping:Several layers of plastic tapes completely covering the cable core and also providing sufficient dielectric strength between conductors and shield. Water blocking swell able tape can also be used as require by the customer.
Filling:Interstices in the Core, and between core wraps and shield are filled with petroleum / synthetic compound so as to effectively protect the cable core from water attack. Modified filling compound meeting tropical climate conditions is also available.
Sheath:Laminated Aluminium Polyethylene sheath (LAP sheath). Aluminum tape, tightly boned to the outer polyethylene, acts not only as an electrical screen but as a moisture barrier. The outer polyethylene is black, high molecular weight, one providing the cable with a tough, flexible, protective covering able to withstand exposure to sunlight.
Insulation: Colored, foamed and high density polyethylene meeting physical and electrical Requirements of client’s specification.
Twining:Insulated conductors, color coded as per table 1, are twisted into pairs with varying lays to minimize cross-talk and capacitance unbalance.
Cable Assembly:
Concentric Layer Type:The twisted pairs are stranded together into a compact and concentric cable core atmospheric temperature, ground chemicals, and stresses expected in standard installations.
Pulling Eye:When required by customer, cables can be shipped with pulling eye attached at running end.
Armour:Armouring such as steel tape armour, wire armour and so on, over the LAP sheath, are available upon request.
Solid annealed bare copper, 0.4/0.5/0.63/0.9mm as per ASTM B-3/class1 of IEC 60028
Insulation
Foam Skin which is a composite polyethylene insulation made of an inner cellular layer and an outer solid skin as per ASTM D 1248/IEC 60708
Twisted Pairs
Insulated conductors are twisted into pairs with varying lay length to minimize crosstalk
Cabling Element
Twisted Pairs
Cable Core Assembly
Cables of 25 pairs or less are assembled into cylindrical core. Cables larger than 25 pairs are assembled into units, which are then used to form the core Units are identified by colour coded binders. Standard construction is per RUS(REA) PE-89 given in Cable Make Up Diagram
Core Wrapping
One or more non-hygroscopic polyester tapes are helically or longitudinally laid with an overlap. These tapes furnish thermal, mechanical as well as high dielectric protection between shielding and individual conductors
Moisture Barrier
A corrugated copolymer coated aluminium tape (0.2mm/8mil) is applied directly over the cable core to provide 100% electrical shielding coverage and ensure a barrier against water vapor
Filling
The cable core interstices are filled with petroleum jelly to avoid longitudinal water penetration within the cable.The water resistant filling compound is applied to the air space between non-hygroscopic tape and shield, shield and sheath within the cable core
Sheath
Black low density polyethylene as per ASTM D 1248/IEC 60708, being able to withstand exposure to sunlight,temperature variations, ground chemicals and other environmental contaminants
Armoured Cable
Corrugated copolymer coated steel tape armour (0.15mm/6mil) is applied with an overlap over an optional inner polyethylene sheath. An outer polyethylene sheath is applied over the armour
Self-Support Cables
A 7-strand galvanized steel strand is used as support wire. Black polyethylene sheath covers both core and support wire in a figure-8 construction
Mechanical and Thermal Properties
Temperature range during operation (fixed state): -30°C – +70°C
Temperature range during installation (mobile state): -20°C – +50°C
Minimum bending radius: 10 x Overall Diameter (unarmoured cables);15 x Overall Diameter (armoured cables)
Dimensions And Weight
Foam Skin Insulated and LAP Sheathed Jelly Filled Cable to RUS(REA) PE-89
