1, wires and cables when used with a communication system, the rated voltage should be at least equal to the nominal voltage of the system; in DC systems, the nominal voltage of the system shall not be more than 1.5 times of rated voltage; operating voltages exceeding the nominal voltage of the system 10%.
2, wire and cable long-term allowable working temperature does not exceed 70℃, BV-90 should not exceed 90 ℃; laying temperature should not be less than 0℃.
3, wire and cable bending radius: cable outer diameter of less than 25 mm shall be not less than 4 times the cable diameter, 25 mm or more, the cable bend radiusshould not be less than 6 times the cable diameter.
4, wires and cables into a circle or disk is 100 metres in length, error of ± 0.5 m inlength.