Instrumentation Cables
>> Technical Data

Application:
Instrumentation Cables are designed for use in the provision of voice and data services and the interconnection of electrical equipment and instruments especially in and around process plants.

Standard:
BS 5308 PART 2

Construction
1. Conductors :
 Plain annealed copper wires to BS 6360
2. Insulation : PVC
3. Pairs: Insulated cores are twisted to form a pair, and the length of lay of any pair shall not exceed 100mm
4. Colour Code: Black/White with pair number printed on white core
5. Individual Screen (IS) (optional): Aluminium / Polyester tape, with tinned copper drain wire 0.5mm²
6. Cabling: The required number of pairs shall be assembled in concentric layers
7. Wrapping: Polyester Binder tape
8. Collective Screen (OS): Aluminium / Polyester tape, with tinned copper drain wire 0.5mm²
9. Nylon Yarn: For easy stripping
10. Bedding (optional): PVC
11. Armouring (optional): Galvanized steel wires to BS 1442
12. Outer sheath: PVC

Technical Information
1. Maximum Operating Temperature : 70°C to 105°C
2. Maximum Working Voltage : 300 / 500 V r.m.s
3. Test Voltage : 1000V r.m.s. for 1 min between conductor, and between conductors and screen / armour
4. Minimum Insulation Resistance at 20°C Indivudual Conductor (between each conductor and remaining bunched conductors / screens and / or armour) : 25 Mohm/km
5. Maximum Mutual Capacitance of pairs or adjacent cores at 1 KHz : 200 pf/m
6. Maximum Capacitance between any core and screen : 400 pF/m
7.
Conductor Size (mm²)
0.5
0.75
1.5
2.5
Max DC Conductor Resistance (Ohm/km)
39
26
12.1
7.41
Max L/R Ration (For Adjacent Cores µH/Ohm
25
25
40
50
8. Cable Marking: : Sigma Cable 300 / 500V to BS 5308
 
 
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