There are multiple fuses in your car protecting various loads. Wire gauge depends on load. The gauge or wire for the battery might be 8 AWG to handle high cranking currents for starter motor. 14 AWG wire might be employed for loads requiring 15 amps or less and so forth.
Yes, no problem at all going to a larger ampacity of wire. Larger size wire yes, smaller size wire no.
Use 8 gauge wire.
The correct size fuse needed is based on the size wire used in the circuit. The size wire needed is based on the load that will be applied to the circuit. 1. AWG 14/2 wire = 15 amp fuse 2. AWG 12/2 wire = 20 amp fuse 3. AWG 10/2 wire = 30 amp fuse 4. AWG 8/2 wire = 40 amp fuse
4800
It is generally safe to use a 250 volt fuse in a 240 volt air conditioner unit. To properly install the fuse, make sure the power to the unit is turned off, remove the old fuse, replace it with the new one of the same size and rating, and then turn the power back on. Verify that the unit is functioning properly before regular use.
# 3 gauge
As with any electrical installation, the wire size used depends on the expected maximum current the wire will carry. That cannot be determined by voltage alone.
The wire size depends on how much current it will conduct.
Use a 20 amp fuse or breaker.
AWG # 10 wire on 30 amp circuit.
AWG 16
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.