Original answer: Square-D, QO style, 100 amp, 2 pole breakers are “listed” for #4 to 2/0 copper or aluminum wire. You will find the approved (listed) wire sizes for ALL Square-D QO breakers molded directly into the plastic case of the breaker.
Will #3 wire fit in a 100 amp breaker?
You need to hire a licensed electrician for this job. A 100 Amp branch circuit would require #3 AWG Cu or #1 AWG Al wire. A single phase circuit would have 3 conductors, a 3 phase circuit would have 4 wires. If using PVC conduit add a minimum #8 AWG Cu ground wire.
Will #1 wire fit in a 100 amp breaker?
Yes, 1/0 aluminum wire is rated for 100 amps & fits just fine into the terminals of 100-amp breakers rated for aluminum conductors.
2 AWG will handle around 94 Amps, while 2/0 AWG will handle around 190 Amps. For a 3% drop where the load is less than 20 feet from the battery and you are drawing 100 Amps, you would need 2/0.
Which is bigger 2 AWG or 4 AWG?
Diameter. A 2 gauge wire is thicker than a 4 gauge wire. In simple terms, the thicker the cable, the higher the current it can transfer. The American Wire Gauge (AWG) is used to describe the thickness of wires.
What is 2 aluminum wire rated for?
USE- 2 is approved for direct burial and for service entrance below ground. USE-2 cables may be used in wet or dry locations, with conductor temperatures not exceeding 90°C. Voltage rating for USE-2 cable is 600V.