"How many amps can a 6 gauge wire 12v dc carry?"
It all depends. There are several factors. Probably the most important would be the expected length of the wire one way only. Others would include the type of wire insulation it has and the highest expected ambient temperature that the wire will be exposed to.
For example: AWG. #6 THHN copper is rated for 0 to 600 volts (ac or dc) and typically rated for 60 amps BUT! There are several "derating" factor to consider. The biggest one being voltage drop when dealing with low voltage direct currents. AWG. #6 THHN copper at 75*C wire with one set + and - in a steel conduit can carry 60 amps over a 10 foot long wire with a 5% voltage drop. So if you started out with 12.6 volts you'd end up with 11.97 volts or less.
By comparison, using that same scenario but using 120 vac, it could carry 60 amps, 100 foot with a 5% voltage drop which leave you 115 volts which is no big deal BUT!, it is a big deal to lose almost a whole volt at 12 vdc nominal.
Remember - Ohm's law - For a given wattage, if the volts change, the amps change and inversely, if either the volts or amps change, the wattage changes. A lot can depend on the type of load as well. Lights might burn dimmer. motors would run slower, a heater would put out less heat and so on and so forth. Or just not work at all.
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A 6-gauge wire can typically handle up to 55-75 amps of current, depending on the specific type of wire and installation conditions. It is important to always consult the manufacturer's guidelines and local electrical codes to ensure safe usage.
A #6 AWG copper wire with 60 degree Celsius insulation rating can carry 55 amps, 75 degree Celsius insulation rating can carry 65 amps, and a 90 degree Celsius insulation rating can carry 75 amps. If it is aluminum or copper-clad aluminum the ampacity for the three temperature ratings would be 40, 50, and 60 respectively.
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.
According to NEC, it's max rating in free air is 18 amps.
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.
The amp capability of a 600 volt wire depends on its gauge or thickness. For example, a 12-gauge wire can typically handle around 20 amps, while a 10-gauge wire can handle around 30 amps. It is important to consult the wire's specifications or a professional electrician to determine the specific ampacity for your application.
The normal current capacity of 12 AWG copper wire is 20 amps.