At 120 volts a 15 amp circuit wired with #14 wire used for a dedicated light circuit do not install any more than 1400 total watts in lighting. If used for an dedicated outlet circuit do not install more than 8 outlets.
AWG # 4 copper.
A #3 copper conductor will do the job.
AWG # 14 copper.
For a 220 volt 100 amp breaker, you would typically need a wire gauge of 2/0 AWG (American Wire Gauge) or larger. It is recommended to consult with a professional electrician to ensure the proper gauge is used for your specific installation.
#14 copper wire is rated for 15 amps.
30 amp breaker with #10 gauge copper wire
A 100 amp residential service requires a size #8 copper wire, it should be insulated in green.
#4 thhn copper or # 2 aluminum
2 AWG.
#6 wire is good for 65 Amps as long as it is type THHN.
3 AWG in copper and 2 AWG in Aluminum.
2 copper