For preservationists contemplating some rewiring, the following notes may be of some use. mohm should of course be m(Omega).
Cable Sizes and Railpart Part No's
Current cable types - Polyrad. Can also be ordered from Anixter.
Railpart cat. no.
Strands
mm2
Approx resistance
mohm / m (pair of cables)
006/110950
37/0.2
1.16
38
006/110960
37/0.25
1.82
24
006/110970
37/0.3
2.62
17
006/110980
37/0.4
4.65
9.5
006/110990
61/0.4
7.67
5.7
006/111000
80/0.4
10.1
4.4
006/111010
126/0.4
15.8
2.8
006/111020
196/0.4
24.6
1.8
006/111030
276/0.4
34.7
1.3
006/111040
396/0.4
49.8
0.93
006/111050
360/0.5
70.7
0.62
006/111060
475/0.5
93.3
0.47
006/111070
608/0.5
119
0.36
0006/155020
27-core jumper cable
Original cable types
Also showing where these wire types would likely be used.
Strands
mm2
Replacement
Typical Uses
3/0.036"
1.97
37/0.3
Some heater circuits
7/0.029"
2.98
37/0.3
Most control circuits
110/0.0076"
3.22
37/0.3
A few control circuits - use 37/0.3
7/0.036"
4.60
37/0.4
Heater power circuits (motor, glow plug)
7/0.044"
6.9
7/0.052"
9.59
80/0.4
Power supplies, lights, train wires 33 and 34
19/0.52
26
163/0.018"
26.8
196/0.4
Charge sockets
248/0.018"
40
61/0.044
60
416/0.018"
68.3
360/0.5
Engine start
235/0.029"
100
475/0.5
Dynamo, main battery
A note on the use of 7/0.052" for some circuits where it seems excessive. Whilst a
smaller cable would be sufficient to carry the required current, the voltage drop becomes
unacceptable over lengthy runs.
