4/28/2024 0 Comments 2 pole 100 amp breaker wire sizing![]() ![]() What kind of receptacle is it? If it is an ordinary 15- or 20-amp duplex receptacle, then yes, you'll probably find it hard to wire satisfactorily with #8. ![]() But if the distance is 100 feet or more, it is worth considering using a 6 gauge size wire for a 40 amp breaker. Without knowing more of the specifics, you almost certainly need conduit there instead of direct-burial cable. There is no problem using the minimum recommended 40 amp breaker wire size if the circuit line is below 100 feet. If you're only actually drawing 30-amps, then so what?įinally, I doubt seriously that the 8/2UF run near the pool meets code. If minimizing voltage drop was your objective in selecting #6 for a 30-amp feeder, using a larger breaker doesn't affect that. (For aluminum, then 40-amp or 50-amp.) If you want to reduce the amount of available power elsewhere, leave that "job" up to the breakers protecting the branch circuits at the subpanel. If it's copper, a 50-amp or 60-amp double pole breaker is what you want for that purpose. The purpose of the breaker at your main panel is to protect the #6AWG wire. ![]() Unless that panel can't handle more than 30 amps, it'd be better simply to increase size of the breaker. That means that the 12 AWG wire with 25A ampacity won’t be enough any more. Here is how you calculate the ampacity now: 20 Amp Wire (100 ft away) 25A × 1.2 30A Ampacity. It's not a great solution, but it's better than shaving the skinned tails of the conductors. If you want to use those 20 amps 100 feet away, you need to increase the minimum ampacity the wire can handle by 20. Secondly, why 30-amp breaker(s)? Is it because the subpanel is rated for only 30 amps? If so, your best option may be to pigtail a short length of #8 or #10 in the main panel enclosure. (I may have misunderstood what you meant by two breakers, but just wanted to make sure!)Ģ. It is potentially dangerous to use two independent breakers that are not designed to trip simultaneously because one pole will remain hot even after the other trips. Cutler-Hammer 100 Amp 120/240 Volt 2-Pole Residential Circuit Breaker. Why do you have two breakers? If your run is to feed a subpanel, you should have one two-pole breaker, not two separate breakers. A couple of points right out of the chute:ġ. ![]()
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