I use Polywire for dividing paddocks. The perimeter fence measures over 5000 volts and the Polywire measures 900 volts. SIZE DOES MATTERace admirer said:No...its not a current thing,,,,its a voltage thing. at the voltages and currents used on fence chargers, the diameter of wire will have very, very little effect....except the breakage thing others have mentioned.
polywire uses three strands of very small wire,,i would guess it has a diameter of about 0.015 inch diameter.