![]() Anything over 60A per phase and it should trip in short time. It will hold up to 60A for a period of time, but you do run the risk of tripping the main. That being said, in this application, you could conceivably run 48A constant on either phase of the panel without tripping the main. All breakers are rated to handle 80% of a load consistantly. Try and plan out what loads will be running at the same time frequently and try and get them on opposite phases. This is why trying to balance your panel is important. It is physically impossible therefore to have 120A on your neutral, because your main breaker will only allow 60A to ground/neutral per leg. The neutral picks up the unbalanced load. If they were on the same phase, you would have 26A on the neutral at the panel. If they are on opposite phases, you will only have 2A on the neutral in the panel. At the same time your table saw is running at 12A. Say you have a 120v dustcollector running and is pulling 14A. What I had posted previously touched on this a bit. This is very different than the entire load. I did not read the above article, I hope it did not have the mistake in it. notice how it is the same power capability of the 120V load example above.įor more detail and pictures, visit Cliff Holmes excellent article: ![]() In 240V, current flows from one hot to the other and are necessarily the same, so you are limited to 60A by the panel size.Ĭorrect, you can get 240V x 60 amps = 14,400 watts of power. You can get 120v x 120 amps = 14,400 watts out of the 60 amp panel if only 120V loads are connected. 120/240 is single phase or can be called split phase due to the 180 degree phase shift used. It is incorrectly referred to as two phase usually by industrial types that have always heard it called that. This is the beauty of split phase 120/240 systems. The neutral current on the service cable will be almost zero with 60 amps on each leg. You can load each leg to 60 amps if you want with all 120V loads. No, the neutral current is only the unbalanced amount, for example if you have all 120V loads with 40 amps on leg 1 and 60 amps on leg 2 the neutral current will only be 20 amps. Ideally you want the load balanced between legs. Even though both feeders will be rated for 60A, you can't use 120A since the neutral will only be rated for 60A. For a 60A panel, you are limited to 60A in the neutral, meaning that you could have 60A in one hot leg and 0A in the other, or 30A in both. In 120V, current flows from hot1 (or hot2) to neutral. In a 240V circuit, the device is connected to both hot legs (hot1 = 120V, hot2 = -120V) giving you a voltage difference of 240V. In a 120V circuit, your device is connected to one hot leg (hot1 = 120V) and to neutral (neutral = 0V). In a circuit, the current is the same everywhere.
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