telephone cable

a Porduct introduction The cables are designed for main communicationlines of mining Wells, streets, etc and connecting cables betwwen connecting box and telephone. b complied standard GH/JT 051-2000 c Type and description of cables TypeDescriptionApplicationHUVVCopper core ,PVC Insulated and sheathed mining telephone cable Laying in mining well, for common occasionHUVV22Copper cor, PVC Insulated and sheathed mining telephone cable with steel tape armor d application Condition The temperature of cable of cables is -40DEGREE?-?+60DEGREE? The lowest installation temperature of cable is -5DEGREE? Permissive bending radius of cable should be no less than 20 times of external diameter of cable. e Main technical Parameter Conductor Conductors construction and DC resistance should be in accordance with the table Following: type of cableSpecification of conductorNom. insulation thicknessMax.DC resistance at 20DEGREE?/td>Min.insulation resistance at 20DEGREE?/td>pairs of cableHUVV HUVV220.80.5440Ω/km40MΩ*km5,7,10,20,30,50,100 Insulation YD/T760-complied low density,middle and high density PE are adopted as insulation. There are 3 colors:red, blue ,and white for insulation ,When can be natural color. Nom.Value of sheath should conform to the stipulation of Table .Allow 10% minus. Tolerance for sheath thickness,but minium thickness should be not less than 85% of nominal value. test Finished cable can withstand AC 50HZ?000V when tested by voltage with standing test. Insulation resistance Min insulation resistance of cable at 20DEGREE?should be in accordance with the stipulation of the Table of conductor. f delivery Length that is to be reeled is no less than 100m.Should two sides agree ,any length is allowed to be in delivery. The tolerance of length should be no more than +-0.5%.