Awg Wire Size Chart. For given size from applicable column of Table 31016 for insulation temperature rating and conductor material. For the 00 000 0000 etc.
The n gauge wire diameter d n in millimeters mm is equal to 0127mm times 92 raised to the power. The diameter information in the table applies to solid wires. According to the American Wire Gauge AWG method the highest Gauge of a wire is Nr.
12 AWG - maximum of 25 Amps in free air maximum of 20 Amps as part of a 3 conductor cable.
There are 40 gauges between these largest and smallest sizes or you can say 39 steps. AWG general rules of thumb - for every 6 gauge decrease the wire diameter doubles and for. The table below shows various data including both the resistance of the various wire gauges and the allowable current based on a copper conductor with plastic insulation. The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker 10-gauge wire is the right one to go with.