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You are probably thinking about 1/0 wire (1 ought wire). In copper it is rated at 175 amps and in aluminum 125 amps.
70 amps.
According to NEC, it's max rating in free air is 18 amps.
30 amps
A #8 copper wire with an insulation rating of 90 degrees C is rated at 45 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.
You are probably thinking about 1/0 wire (1 ought wire). In copper it is rated at 175 amps and in aluminum 125 amps.
70 amps.
According to NEC, it's max rating in free air is 18 amps.
140 AMPS
30 amps
Aluminum 4/0 wire car carry 180 amps at at 75 degrees Fahrenheit or 205 amps at 90 degrees. .
A #8 copper wire with an insulation rating of 90 degrees C is rated at 45 amps.
18 amps.
101 amps for chassis wiring and 37 amps for power transmission. This is for short lengths of wire.
Generally 40 amps continuous or 50 amps surge is safe.
To determine how many amps a battery can handle, this information should be on the battery itself. You can also get a battery tester to determine amperage.