Single-pair distributing telephone wires are designed for concealed and open fixed wiringof telephone distribution circuit(ТРП model) and structure wall wiring (ТРВ model).
CONDUCTOR: copper, soft, single.
INSULATION: polyethylenefor ТРП, PVC compound forТРВ. Two parallel laid conductors are insulated and separated from each other with flat base of the same material.
NUMBER OF CONDUCTORS: 2
CONDUCTORDIAMETER, mm: 0.4; 0.5.
Conductor direct-current resistance for a length of 1 km at a temperature of +20°С shall be not less than:
- for conductor with 0.4 mm diameter - 148Ω;
- for conductor with 0.5 mm diameter - 94Ω.
Operation temperature: from -60°С to +65°С (for ТРП model); from -40°С to +65°С(for ТРВ model)
ТРВ model wires shall not spread combustion when single laid.
Wiring shall be performed at ambient temperature not lower than -30°Сfor polyethylene insulated wires and not lower than -15°Сfor polyvinylchloride insulated wires
ТРВmodel insulation shall be resistant to deformation and cracking at a temperature of +65°С.
Insulation can be of any color. The wire designed for structure wall wiring shall have light-stabilized black insulation.
Factorylength - not less than 400 m.
Operational life of wires in case of outer wiring - not less than 12 years; for inner wiring - not less than 25 years.
