So if you divide the available watts by 120V you get 110 amps on a perfectly balanced Panel. I talked to an electrician about it and suggest you do the same. Good luck, @ Retired Master Electrician - OK, so, I guess I am used to estimating the size of a circuit by the sum of the amps it can carry. 6 AWG NM-B is rated 55 Amp @ 60 degree C (most conservative). When used in home wiring a double pole breaker is used when a 240 volt service is needed (for a high draw appliance like a range or dryer). _____ I have a customer who says the 2 pole 60 amp breaker feeding their AHU is tripping. Heat comes on breaker trips. For a better experience, please enable JavaScript in your browser before proceeding. @Ecnerwal Haha, yup, my bad 120v/240v... Don't know why I keep that in my head... https://diy.stackexchange.com/questions/132996/60a-two-pole-breaker-supplying-a-sub-panel-220v-how-many-amps-for-separate-1/132999#132999. RATE. Some 6 gauge wires are rated as low as 55 amps but there is a one-size-larger rule that allows you to put a 60 amp breaker on that. This amp circuit accompanies a voltage requirement of 240 V. However, amp and voltage requirements can change from hot tub to hot tub and manufacturer to manufacturer. This allows the breaker to handle the temporary surge that happens when an appliance such as a … There is the sound of a high amp load starting when the AHU fan kicks on (yes I made sure it was the AHU fan, and not the CU). See the data sheet for details. The voltages keep moving up. A typical house has all breakers summing up to more than the main breaker), Click here to upload your image However, circuits should not be loaded to greater than 80 percent of their maximum capacity for long periods, which makes 1,920 watts the safe maximum for a 20-amp circuit. Circuit 40 amp 240 volt 40 amp x 240 volt 9,600 watt. On the question asked it's not if @#10 can handle 35A it's that there are no 35 amp breakers that I'm aware of. Example: Bigger multi-zone mini-split units usually need amp breakers. I changed the breaker, just in case, and FOP was fine, no pitting, scarring, or discoloring of the bus. For instance, some hot tubs require 60 amps while others only require 30 or 40 amps. Follow the code and you are safe. Member. The amperage is the maximum you can use at any one time. If an appliance attached to a 120V energy source requires 1200 watts to run, it will automatically pull 10 amps of current through the line. So yes, a 14 gauge wire will safely carry 20 amps, no problem.You get 50% more current capacity with 12 gauge wire compared to 14 gauge wire.So the 12 gauge wiring would trip immediately if there was a dead short. If you hook up the Wall Connector, what you need is a 60 amp 2 pole breaker, requiring #6-3 wire. Click to see full answer. It's a 60 because the ahu has 10 kw of backup heat. A 100-amp service is good for a home of less than 3,000 square feet that does not have central air-conditioning or electric heat. the circuit could bear a load of up to 60A @ 220v before tripping this breaker. Similarly, can 10 gauge wire handle 35 amps? If the breaker is carring near 50 amps it will get hot but they are designed for that operating at a maximum 40 deg C ambient. You can use the 100 amp panel off a 60 amp breaker if you determine that it is adequate, but I would suggest that in sizing your feeder wires and conduit it would be a good idea to size them to accomodate 100 amps. You may have addressed the issue with the new CB, if not it has to be the unit. ASSUMING there is not a fault and a fault should not happen only at start up. i.e. However, a double pole breaker is essentially two breakers tied together with a handle tie, so it can … Still, that will not go over 60amps. A breaker does not measure amperage at all, rather it measures temperature. This is the new millennium, this ain't 1984. By this standard, the total current draw on a 20-amp circuit shouldn't exceed 16 amps. Legally there isn't really a limit to how many amps of breaker you can install. A home larger than 2,000 square feet that has central air-conditioning or electric heat probably needs a 200-amp service. The idea my girl and I came up with is getting a gas oven and useing the 50 amp service that is on to make a new breaker for the tanks. As to the use of single pole breakers for a multiwire branch circuit, that is a code violation unless the breakers are tied together with a handle tie from the manufacturer. Click to see full answer Herein, can a 14 gauge wire handle 20 amps? The magnetic protection of a thermal magnetic breaker will trip very rapidly with very high current as in a fault condition, but the thermal protection will trip very slowly with a slight overload. How many amps can a 40 amp breaker handle? The 80% you mention is a calculation for continuous circuits and is not used for panel loading. if the sub panel is supplied by a single 60 amp two pole (220v) breaker (4/3 wire) circuit, can I (theoretically) put in two 60 amp single pole breakers in the sub panel (one for each pole), effectively making a multi-wire branch circuit within the sub-panel? Also, handle-ties are not an option if you need AFCI or GFCI. A forum community dedicated to professional electricians, contractors, and apprentices for residential and commercial work. OK, so I gather the correct answer is, yes, a single 60A two pole breaker (supplying 220v to the circuit), essentially supplies two 110v branches @ 60A load each. NM-b works on 60 amp breaker if the operating load falls over 50 but not over 55 amps. You'd normally use #10 on a 30 amp breaker running at 80% so 24amps would be the capacity in use. If it falls on 56 amps you cannot use 6/3 G nm-b and a 60 amp breaker. A 14 gauge wire would not trip the breaker and it could smolder for a while. Similarly, you may ask, how many amps can 6 AWG carry? As to the use of single pole breakers for a multiwire branch circuit, that is a code violation unless the breakers are tied together with a handle tie from the manufacturer. Actual load is 48 Amps… The 50 amp receptacle will supply 50 amps forever. The larger current rating is for surges. Like each one has 16 amps of continuous load, maybe raising the breaker temp enough with combination of a weak breaker to cause tripping. Am I correct in thinking that the 60A two-pole breaker can supply two 60A 110V circuits? If the load truly is 1200 amps, then a 1500 amp capacity service is needed. What it can handle is however much it takes to produce 60 Amps output. You can check 2-zone , 3-zone , 4-zone , and 5-zone mini-split system to see how many amps they run on. (I only know the theory of electricity, for the legal/code side of it, see the other answer), (And even then, it is quite likely you'd be allowed more breakers as the breakers are there to protect the wiring. Late to the game here, but 50-amp and 60-amp breakers can take the same wire gauge. In almost any breaker made, the handle-tie will also have the effect of common trip. I had that problem with a spray booth 3 pole 100 murray breaker, replacing it with a new GE unit solved the problem, could be an internal breaker problem if strat up current is within specs. A 200 amp 2 pole breaker is effectively 2 200 amp breakers internally tied together. Come join the discussion about trade knowledge, tools, certifications, wiring, builds, scales, reviews, accessories, classifieds, and more! Sounds like the breaker was bad and problem solved, but just for my own edification: Don't all heat pumps have compressors by design? That depends on the amount of current. 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