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Types Of Voltage Cable Supply Outdoor low-voltage lines have several distinct characteristics: It is basically supported by cement poles, and the cement poles are relatively short, generally no more than 5 meters. The thickness of the wires is the same, and the number of wires is a multiple of 4. This is because low-voltage wires generally use a three-phase four-wire system. If these characteristics are present, it can be determined that the line voltage of the wire is 380 volts and the phase voltage is 220 volts.