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How to properly connect wires

Discussion in 'General Electronics Discussion' started by DiodeDave, Sep 15, 2015.

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  1. DiodeDave


    Dec 7, 2011
    I need to connect wires from the controller on my locomotive to the 2 motors wired parallel. There is one lead from the controller going to each of the motors.

    The circuit is protected with a 30a fuse and the motors are 7.5a each. The system is 24vdc.

    The wires are subject to movement as the truck containing the motors moves around the track.

    The wire from the controller is 10awg and the motor wires are 12awg.
    One 10awg wire is presently connected to 2 12awg wires with a wire nut.

    During my testing, the 30a fulse blew when one motor malfunctioned (as noted in another thread). So I'm guessing the wire and fuse size are proper.

    Would there be any harm in soldering the wires? Wouldn't the fuse blow or insulation melt before the solder?

    Or, what is the best way to make the connection?

    Thanks in advance.
  2. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Hello Dave
    Yes you can solder the wires together. In a fault condition the fuse should blow before the solder melts. Another option is you could use a terminal block with a suitable current rating. It's like a shorting block with screw terminals which makes it a bit more convenient to extend, or replace the wires if they get damaged.
    Martaine2005 likes this.
  3. duke37


    Jan 9, 2011
    If you use a terminal block where the wires go in from opposite sides, then make the wires overlap so you connect directly from one wire to the other and have two clamping screws on both wires.
    If the connection is not good, the heat will cause the screws to loosen and even more heat will be generated.
    Arouse1973 likes this.
  4. Minder


    Apr 24, 2015
    Arouse1973 likes this.
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