Standards
• CW 1109 (PVC T2)
• CW 1257 (Cross linked PVC)
• CW 1423 (PVC BT M154)
Construction
Conductors
Solid annealed tinned copper 0.32/0.4/0.5/0.6/0.8/1.0mm as per class 1 of BS 6360/IEC 60228
Insulation
PVC Type 2 to BS 6746 (CW 1109); Cross-linked PVC (CW 1257) & PVC (CW 1423)
Twisted Pairs
For CW 1109 & CW 1257, two insulated conductors are twisted into pairs with varying lays to minimize crosstalk. For CW 1423, one, two, three, four or five insulated conductors are twisted together with a right hand lay
Electrical Properties
CW 1109
Nominal Conductor Diameter |
mm |
0.32 |
0.4 |
0.5 |
0.6 |
0.8 |
1.0 |
7/0.2 |
Conductor Size |
mm2 |
0.08 |
0.126 |
0.196 |
0.283 |
0.5 |
0.785 |
0.22 |
Maximum Conductor Resistance @20°C |
Ω/km |
234 |
148 |
95 |
65.9 |
36.7 |
23.3 |
89.9 |
Minimum Insulation Resistance @500V DC |
MΩ.km |
50 |
50 |
50 |
50 |
50 |
50 |
50 |
Minimum Insulation Thickness |
mm |
0.12 |
0.15 |
0.15 |
0.15 |
0.25 |
0.25 |
0.15 |
Maximum Insulated Conductor Diameter |
mm |
0.7 |
0.85 |
0.95 |
1.05 |
1.5 |
1.7 |
1.05 |
CW 1257
Nominal Conductor Diameter |
mm |
0.4 |
0.5 |
0.6 |
Conductor Size |
mm2 |
0.126 |
0.196 |
0.283 |
Maximum Conductor Resistance @20°C |
Ω/km |
153 |
98 |
68.9 |
Minimum Insulation Resistance @500V DC |
MΩ.km |
50 |
50 |
50 |
Minimum Insulation Thickness |
mm |
0.25 |
0.25 |
0.25 |
Maximum Insulated Conductor Diameter |
mm |
1.0 |
1.10 |
1.20 |
CW 1423
Nominal Conductor Diameter |
mm |
0.5 |
Conductor Size |
mm2 |
0.196 |
Maximum Conductor Resistance @20°C |
Ω/km |
98 |
Minimum Insulation Resistance @500V DC |
MΩ.km |
50 |
Minimum Insulation Thickness |
mm |
0.25 |
Maximum Insulated Conductor Diameter |
mm |
1.10 |
| 
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