Site Prep - International Installations Cable Specifications2-7Cable SpecificationsThe cable type tables listed below form part of the individual system ATEX approval.Substitution of cable may impair intrinsic safety and may invalidate system approval.All specifications are in free air at +30°C:Table 2-1. Probe Cable Specification (GVR P/N 222–001–0029) - Maximum Of 305 Metres Per ProbeNumber of Cores 2Conductors Bare copper, 24/0.20mm, diameter 1.1mmInsulation PVC R2 to CEI 20-11, colour black 1/black 2, radial thickness 0.54mm, twisting 1x 2, lay pitch 76mmShielding Aluminium polyester tape, tinned copper drain wire 7/0.30mmSheath PVC RZ FR hydrocarbon resistant, colour blue, radial thickness 0.80mmDiameter 6.10mmConductor Resistance 25 ohm/kmDrain Wire Resistance 15 ohm/kmCapacitance 0.14 F/km (140 pF/m)Inductance 0.65 mH/km (0.65 H/m)LR Ratio 17 H/ohmInsulation Resistance 1050 Mohm/kmVoltage Core to Core 500Voltage Core to Screen 500Voltage Earth to Screen 500Voltage Test 1kV/1 minuteStandard IEC 227-74Table 2-2. Data Transmission Cable Specification (GVR P/N 4034-0147)Cable Type 2 x twisted pair, PVC insulated, foil wrapped, common drainConductor Stranding 7/0.25mmCharacteristic Impedance 58 ohmsCapacitance 203 pF per metreAttenuation 5.6 dB per 100 mOperating Temp. Range –30°C to +70°CInsulation PVCSheath PolyethyleneSheath Colour GreyWARNING