The messenger in triplex and quad is already determined by the wire size that is wrapped around it. It is the maximum span distance that you should find for the size of over head cable that is being used.
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Check it with a voltmeter or with a voltage detector.
The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.
Wire size is governed by amperage not voltage. Voltage is an insulation factor when talking about wire. Add up the amperage of fixtures you want in the circuit. Once that is found then the size of the wire can be calculated.
Use what is called bell wire or thermostat wire.
The minimum size wire that engineers spec for industrial and commercial installations is #12 and it usually is stranded not solid wire.