POLYETHYLENE INSULATED CABLES (BS 5308 Part 1: 1986)
Suitable for operation at voltages up to and including 300V r.m.s. core to earth and 500V r.m.s. core to core and at maximum of 70°C.
Categories of Cable
Cables are categorized into 3 types as follows:
Type 1: Polyethylene insulated and PVC sheathed
Type 2: Polyethylene insulated, Polyethylene bedded, single wire armoured and PVC oversheathed
Type 3: Polyethylene insulated, PVC bedded, lead alloy sheathed, PVC bedded, single wire, single, wire a rmoured and PVC oversheathed.
Performance data
Conductor resistances & L/R ratio
Nominal conductor area
mm2 |
Nos. & nominal diameter of wires
#/mm
|
Maximum conductor d.c. resistance
@20ºC - Ω/km |
|
0.5
|
1/0.8 |
36.8 |
25 |
0.5 |
16/0.2 |
39.7 |
25 |
1.0 |
1/1.13 |
18.4 |
25 |
1.5 |
7/0.53 |
12.3 |
40 |
Maximum mutual capacitance
Nominal conductor area
mm2 |
|
Collective screened cable (except 1 & 2 pairs) at 1kHz
pF/m |
Individual pair screened and 1 & 2 pairs collective screen cable at 1kHz pF/m
|
0.5 |
75 |
75 |
115 |
1.0 |
75 |
75 |
115 |
1.5 |
85 |
85 |
120 |
Capacitance unbalance
The Maximum pair to pair capacitance unbalance values at 1kHz shall be 250 pF/250m.
Colour Indentification
The standard colour of sheath shall be black, other colours available (eg. Blue for intrisically safe-circuit).
|
