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Cable Ratings

Standard Wire Sizes and Current Capacities

The std EU method of defining a wire is based on the number of conductors and their diameter in milllimetres. Thus a (1/1) cable is one conductor of 1mm diameter, whilst a (10/0.1) cable would be ten conductors of 0.1mm diameter

TypeCurrentDia mm12V24V
(1/0.6)0.5A1.26W12W
(10/0.1)0.5A0.96W12W
(7/0.2)1.4A1.216.8W33.6W
(16/0.2)3.0A1.636W72W
(24/0.2)6.0A2.0572W144W
(32/0.2)10.0A2.5120W240W
(50/0.25)30.0A3.81360W720W
(30/0.1)1.5A2.018W36W
(55/0.1)2.5A2.830W60W

Worked Example:

An A1A-A1A locomotive has four RE-385 motors (two in each bogie).

Each motor draws 0.857 Amps at 12 Volts thus the continuous draw on the battery is 3.428 Amps. At 41 Watts, this would indicate that a cable type (24/0.2) would be needed for all connections from the battery to the ESC. This would of course need to be fused, to calculate the fuse rating multiply the constant load drawn by the devices by 1.4 for a SLOW BLOW fuse -or 0.9 times the cable rating for a FAST BLOW fuse.

Thus a 5 Amp rated fuse would be suitable in either version.

From the ESC power is fed to each bogie, assuming a perfect split, then 1.714 Amps is carried to each bogie. This indicates either (16/0.2) or (55/0.1) as a choice of cable. However there is a greater need for flexibility in a moving bogie so the thinner cored cable wins out -this is (55/0.1).

Each motor is then fed from its own cable within the fixed rigid confines of the bogie -thus flexibility is not a requirement. In this case (7/0.2) would be used as it is more rugged due to its thicker conductors and thinner in diameter.


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Page last modified on July 23, 2017, at 02:46 AM