CABLES AND WIRES - Novkabel

Properties of materials used for cables productionProperties of metalsProperty Unit Al Cu Fe Sn Pb AlMgSi BronzeBZ IISpecific electrical conductivity at20 o CSpecific electrical resistance at20 o CSm/mm 2 36 58 7,2-1,4 8,4 4,8 30,5 36Ωmm 2 /m 0,028264 0,017241 0,14-0,72 0,119 0,21 0,0328 0,02773Temperature resistance coefficient 10 -3 /K 4,0 3,9 4,5 4,4 4,2 3,6 3,8Density g/cm 3 2,7 8,9 7,8 7,3 11,34 2,7 8,9Tensile strength N/mm 2 65-130 200-370 330-850 28 15 294 608-618Thermal conductivity W/Km 220 385 46 67 34 188 -Coefficient of linear expansion 10 -5 /K 2,31 1,7 1,15 2,7 2,8 2,3 1,7Melting pointO C 660 1083 1350 232 327 645 -The properties of some metals used for the manufacturing of certain construction cable elements:Aluminium (Al)Copper (Cu)Steel (Fe)Tin (Sn)Lead (Pb)Aldrey (AlMgSi)– conductor, armour (with single-core cables for electricity transmission via ACpower), metal sheath– conductor, electrical protection– armour– metal sheath for copper wires within the conductor– metal sheat– conductorProperties of most commonly used insulating materialsProperty Unit EPR FEP PVC PE Si XLPEWorking temperature ofconductors, maximumTemperature in short-circuit,maximumO C 90 200 70 70 180 90O C 250 200 160 150 350 250209Environment temperatureO C-30+135-100+200-30+70-50+70-60+180-60+115Specific volume resistance at 20O C, minimumΩ cm 10 15 10 16 10 13 10 16 10 12 10 15Dielectric constant at 20 O C 2,7 2,2 4 - 8 2,3 3,2 2,3Properties of most common sheathing materialsProperty Unit CR HDPE LDPE PVC SiWorking temperature of conductors,maximumEnvironment temperatureSurface electrical resistance at 20 O C,minimumO C 90 90 90 70 180O C-40+90-60+110-60+70-30+70-60+180Ω 10 9 - - - 10 9Dielectric constant at 20 O C 6 - 9 2,3 2,3 4 - 8 3,2