This would be a bad idea. If, for example, one of the wires became disconnected or cut by accident then the remaining wires would have to carry the current which could result in a fire.
30 amps
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.
You are probably thinking about 1/0 wire (1 ought wire). In copper it is rated at 175 amps and in aluminum 125 amps.
In the United States this is a violation of code. Of course you can physically do it. But the code does not allow parallel conductors any smaller than 1/0 unless each individual conductor is large enough to handle the entire circuit. Using 14 gauge wire you would have to have a circuit no larger than 15 amps, regardless of how many wires you parallel.
According to NEC, it's max rating in free air is 18 amps.
30 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.
30 amps
To do so LEGALLY, the circuit breaker must not be rated at a capacity (in AMPS) greater than the SMALLEST wire.
10 guage
2 amps
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.
You can bridge the wires from one amp to the other.
Check the number of amps that your circuit can handle. You should not put devices with more than that many amps (total) on that circuit. Most houses are 15 amps and bathrooms 20 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.
It depends on how many amps it was designed for. A 12.5kV/600v 10kVA 3 phase transformer can handle ~.5 amps on the primary and ~10A on the secondary. A 600/120V 10kVA 3 phase transformer can handle ~10A on the primary and ~50 on the secondary.
In the United States this is a violation of code. Of course you can physically do it. But the code does not allow parallel conductors any smaller than 1/0 unless each individual conductor is large enough to handle the entire circuit. Using 14 gauge wire you would have to have a circuit no larger than 15 amps, regardless of how many wires you parallel.