A Solid Bare Copper
Conductors
B Color Coded Insulation
C Filling Compound
D Non-hygroscopic Core Tape
E Flooding Compound
F Inner Polyethylene Jacket
G Gopher Resistant Bi-Metallic
Shield
H Outer Polyethylene Jacket
Insulation
Polyolefin compound color coded per U.S. telephone industry standards
with color concentrates chosen permanency and electrical balance of
individual circuits.
Pairs, Assembly and Fill
Pairs: Insulated conductors twisted into pairs of specified color
combinations to provide pair identification as well as low susceptibility to
noice pick-up, and with varying lay lengths to minimize crosstalk. The
average pair lay length is limited to 6 inches (15cm) to avoid split pairs
in field splicing or circuit rearrangements.
Core Assembly: Pairs assembled, as required by pair count and
geometry, into concentric sub-units of less than 25 pairs, concentric 25
pair units, and 50 or 100 pair super-units, which are then formed into cable
core in such a manner as to avoid parallelism of like twist pairs in outside
layers of adjacent units for control of unit to unit crosstalk and to ensure
cable flexibility as well as circular core with uniform distribution of
pairs. Each 25-pair group in the cable core is identified by color coded
non-hygroscopic binders.
Cable Core Fill: A petroleum jelly base multi-component filling
compound completely fills the cable core space between insulated conductors
and between the core and the core wrap including the core wrap tape overlap.
The filling compound is especially designed to prevent moisture or water
entry and migration transversely and longitudinally in the cable core. High
immunity to moisture and water penetration is enhanced through high adhesion
and cohesive properties of the compound.
Core Wrap: A non-hygroscopic polymeric tape applied with overlap over
the cable core to ensure high dielectric strength from cable core to shield,
enhance mechanical properties of the cable, and provide thermal barrier for
cable jacket extrusion operation. The space between the core tape and the
inner jacket, is filled with specially formulated flooding compound which is
designed to prevent moisture and/or water entry and migration.
Inner Jacket: Virgin. black, high molecular weight polyethylene
copolymer jacket provides additional mechanical properties and dielectric
strength between the cable core and the shield. The inner jacket also
provides additional provides additional moisture or water ingress protection
in case of outer jacket damage during cable installation or service.
Shield/Armor: (KTTG-F-B) 0.005 inch thick, corrugated bimetal tape,
consisting of metallurgically bonded 0.8 mils Cu, 3.4 mils Fe and 0.8 mils
Cu, applied longitudinally with overlap. Corrugations designed to enhance
cable flexibility and to minimize shield/armor metal fatigue.
Outer Jacket: Virgin black, high molecular weight polyethylene
copolymer jacket extruded overall. The jacket compound is selected for high
resistance to abrasion, weathering, exposure to sunlight, temperature
extremes, environmental stress cracking, and mechanical stresses encountered
during cable installation and service. The jacket outer surface is
sequentially marked at two-foot intervals with cable type, year of
manufacture, footage, pair count, size, and manufacturer.
Shield/Armor: The bi-metallic shield/armor design makes the cables
especially suitable for direct burial installations in gopher infested areas
or in rocky terrain. The cables are totally filled to prevent moisture
and/or water entry and migration during service life of the cables, and
consequently assuring little, if any, change in transmission characteristics
of Okonite’s filled cables. All cable components including insulation and
filling compound are highly compatible with each other, assuring stability
of electrical and physical properties of the cables within their expected
40-year service life.
Applications
Type KTTG-F-B filled cables are designed for exchange area or trunk service
and are primarily intended for direct burial installation. These cables may
also be used in underground duct installations.
Specifications
Conductors: Solid bare copper per ASTM B-3.
Insulation: ICEA, REA PE-39. REA designation BFCY.
Jacket: Meets or exceeds requirements of ICEA S-95-658, Part 4.1.6
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709-07-3025
709-07-4050