Control & Instrumention Cables to BS 5308
Multipair and Multicore Instrumentation
Cables -
Polyethylene Insulated to BS 5308 : Part 1
Application
This specification covers multipair cables used in the provision
of voice and data 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.
Type 3 lead sheathed cables are recommended for burial underground
where there is a high concentration of hydrocarbons in the soil.
These cables are designed for use in Group II 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 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 wire conductors to BS 6360. |
| 2 |
Type 03 polyethylene insulation to BS 6234. |
| 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 03 polyethylene insulation to BS 6234. |
| 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 03C black polyethylene bedding to BS 6234. |
| 7 |
Single layer galvanized steel wire armour to BS EN
10257-1. |
| 8 |
Type TM1 PVC sheath to BS 7655. |
|
|
 |
| 1 |
Plain annealed copper wire conductors to BS 6360. |
| 2 |
Type 03 polyethylene insulation to BS 6234. |
| 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 |
Lead alloy sheath to BS 801. |
| 8 |
Type TM1 PVC bedding to BS 7655. |
| 9 |
Single layer galvanised steel wire armour to BS EN
10257-1. |
| 10 |
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 |
| 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 - 5000 MΩ.km at 20°C. Between individual
screens - 1 MΩ/km at 20°C |
| Maximum
mutual capacitance at kHz: |
Cables without individual pair
screens, 0.5mm2 and 1.0mm2 - 75 pF/m,
1.5mm2 - 85 pF/m. All cables with individual pair
screens and 1 or 2 pair cables collectively screened, 115
pF/m for 0.5mm2 and 1.0mm2 ,120 pF/m for 1.5mm2 |
| Maximum capacitance
unbalance |
250pF/250m 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 332-3C.
Type 3 complies as Type 2 |
| |
|
| Minimum bending 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 combinations, generally
to this specification, can also be produced to order, as can a range
of thermocouple, extension and compensating cables. 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
critical, 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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