Site Prep - International Installations
Cable Specifications
2-7
Cable Specifications
The 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 Probe
Number of Cores
2
Conductors
Bare copper, 24/0.20mm, diameter 1.1mm
Insulation
PVC R2 to CEI 20-11, colour black 1/black 2, radial thickness 0.54mm, twisting 1x 2, lay pitch 76mm
Shielding
Aluminium polyester tape, tinned copper drain wire 7/0.30mm
Sheath
PVC RZ FR hydrocarbon resistant, colour blue, radial thickness 0.80mm
Diameter
6.10mm
Conductor Resistance
25 ohm/km
Drain Wire Resistance
15 ohm/km
Capacitance
0.14
F/km (140 pF/m)
Inductance
0.65 mH/km (0.65
H/m)
LR Ratio
17
H/ohm
Insulation Resistance
1050 Mohm/km
Voltage Core to Core
500
Voltage Core to Screen
500
Voltage Earth to Screen
500
Voltage Test
1kV/1 minute
Standard
IEC 227-74
Table 2-2. Data Transmission Cable Specification (GVR P/N 4034-0147)
Cable Type
2 x twisted pair, PVC insulated, foil wrapped, common drain
Conductor Stranding
7/0.25mm
Characteristic Impedance
58 ohms
Capacitance
203 pF per metre
Attenuation
5.6 dB per 100 m
Operating Temp. Range
–30°C to +70°C
Insulation
PVC
Sheath
Polyethylene
Sheath Colour
Grey
WARNING
