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By John Joyce


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.

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