The normal current capacity of 12 AWG copper wire is 20 amps.
The amps that a four gauge wire will handle will depend with the thickness of the wire. If the wire is thin, the four gauge will handle 95 amps.
140 AMPS
10 gauge wire will only run up to 30 amps
Generally 40 amps continuous or 50 amps surge is safe.
15 amps
To carry 300 amps of current, you would need a very large wire size, likely in the range of 3/0 or 4/0 gauge wire. It's important to consult with an electrician to ensure the wire size meets building codes and safety standards for such high amperage.
3/0 gauge
5000 watts
A zero gauge wire can typically handle up to 300 amps of current. However, the exact capacity may vary depending on the specific wire material and insulation used in the wire. It is important to consult the manufacturer's specifications for the wire you are using to determine the exact ampacity.
A 14-gauge wire can typically carry up to 15 amps of current, while a 12-gauge wire can handle up to 20 amps. It's important to follow the manufacturer's guidelines and electrical codes when determining the maximum current for a specific wire size.
34.539 miliamps is only 0.034539 amps. A 16 gauge wire will handle that.