Control & Instrumention Cables to BS 5308
Multipair and Multicore Instrumentation
Cables - PVC Insulated to BS 5308 : Part 2
Application
This specification covers multicore and multipair cables used in
the provision of communication services and the interconnection
of electrical equipment and instruments, particularly in and around
process plants, where transducer generated signals are transmitted
through marshalled circuits to panels, controllers and associated
devices.
Cables to Part 1 are widely used throughout the petroleum industry,
while Part 2 are more common to the chemical and petrochemical industries.
Type 1 unarmoured cables are generally for indoor applications.
Type 2 armoured cables are suitable for burial underground.
These cables are designed for use in intrinsically safe systems.
However, it must be noted that cables used when installing an intrinsically
safe system are required to conform to any relevant requirement
on the certification documents, either for the system or for the
intrinsically safe and associated apparatus forming parts of the
system. Cables should also be suitable for the environment in which
they are going to be used. This means that for some applications
the cable specified in BS 5308 may not be suitable.
Construction
 |
| 1 |
Plain annealed copper conductors to BS 6360. |
| 2 |
Type TI1 PVC insulation to BS 7655. |
| 3 |
Individual pair screen (optional)-
a) Aluminium/polyester tape, metallic side down, in
contact with minimum 0.5mm2 tinned copper
drain wire.
b) Polyester isolating tape(s) numbered for identification. |
| 4 |
Polyester binder tape. |
| 5 |
Collective screen (optional) -
Aluminium/polyester tape, metallic side down, in contact
with minimum 0.5mm2 tinned copper drain wire. |
| 6 |
Type TM1 or Type 6 PVC sheath to BS 7655. |
|
|
|
 |
| 1 |
Plain annealed copper wire conductors to BS 6360. |
| 2 |
Type TI1 PVC insulation to BS 7655. |
| 3 |
Individual pair screen (optional)-
a) Aluminium/polyester tape, metallic side down, in
contact with minimum 0.5mm2 tinned copper
drain wire.
b) Polyester isolating tape(s) numbered for identification. |
| 4 |
Polyester binder tape. |
| 5 |
Collective screen (optional) -
Aluminium/polyester tape, metallic side down, in contact
with minimum 0.5mm2 tinned copper drain wire. |
| 6 |
Type TM1 PVC bedding to BS 7655. |
| 7 |
Single layer galvanised steel wire armour to BS EN
10257-1. |
| 8 |
Type TM1 PVC sheath to BS 7655. |
|
|
Technical Data
| Maximum conductor
operating temp: |
+ 65°C. |
| Minimum ambient temp: |
-20°C after installation and only when cable is in a fixed
position. |
| Maximum working voltage: |
300/500V r.m.s. |
| Test voltage: |
1000V r.m.s. between conductors and between conductors and
screen/armour. |
| Maximum conductor
d.c. resistance: |
Ω/km at 20°C
| Conductor Size |
Ω /km at 20°C |
| 1/0.80mm (0.5mm2) |
36.8 |
| 16/0.20mm (0.5mm2) |
39.7 |
| 1/1.13mm (1.0mm2) |
18.4 |
| 7/0.53mm (1.5mm2) |
12.3 |
|
| Minimum insulation
resistance: |
Individual conductors - 25 MΩ/km
at 20°C. Between individual screens - 1 MΩ/km
at 20°C. |
| Maximum mutual capacitance
at 1Khz: |
Pair of adjacent cores - 250 pF/m at 1KHz. |
| Maximum capacitance
to screen: |
450pF/m at 1KHz. |
| Maximum
L/R ratio: |
|
Conductor Size
|
µH/Ω
|
|
0.5mm2
|
25
|
|
1.0mm2
|
25
|
|
1.5mm2
|
40
|
|
| Spread
of flame: |
Type 1 complies with BS 4066 : Part 1, EN 50265, IEC 60332-1.
Type 2 complies as type 1, additionally with BS 4066: Part
3, NMV 1.5, EN 50266, NMV 1.5, IEC 60332-3C. |
| Minimum
bending radius : radius: |
Type 1 - 5 x overall diameter.
Type 2 - 6 x overall diameter.
Type 3 - 15 x overall diameter. |
NOTE: These cables are not suitable for direct connection to
a low impedance source e.g. the public mains supply.
Availability
Cables in this range are manufactured to customer order. Alternative
constructions e.g. other conductor sizes or pair/core combinations,
generally to this specification, can also be produced to order.
Specifications to suit individual customer requirements, based on
the BS 5308 specification, can also be manufactured. Our technical
personnel are available to provide information and assistance in
designing cables for your specific installation and operating requirements.
RP, RPLHCL.
For applications where flame spread and the emission of acid gas
is critical, Draka offer a range of bedding and sheathing
compounds with an Oxygen Index between 30 & 35 and, on selected
materials acid gas emission of less than 15% by volume at 800°C.
Customers should specify if they require:
RP - LOI greater than 30.
RPLHCL - LOI greater than 30, acid gas emission less than
15% by volume at 800°C.
Please state a particular LOI if required.
ZERO HALOGEN, LOW SMOKE (OHLS)
For applications where minimal smoke and acid gas emissions are
crititcal, Draka's proprietary OHLS® compounds are rated Zero Halogen,
Low Smoke to BS 6425 (IEC 60754) and BS 7622 (IEC 61034).
When any of these options are ordered, customers should specify
if the compound is required on the bedding (where applicable), the
sheath, or both (where applicable).
Draka offer designs utilising these materials
that can comply with the appropriate category for the cable size
in BS 4066 : Part 3 (IEC 60332-3, EN 50266).
Please contact Draka to discuss your particular
requirements.
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