Size wire for 30 amp breaker9/1/2023 ![]() However, many professionals are recommended to use only 8-gauge wires as it is the maximum wire size for 30 Amp circuit. There is no rule when it comes to using larger wire sizes. If you need a more stable current supply of loads, you can use a thicker wire size. Minimum size means that you can increase the size of your wire. A 10-gauge wire can safely carry the amount of current loads supplied by a 30-amp circuit. If you look into a 30 Amp wire size chart online, the recommended size is a minimum of 10-gauge wire. The wire size needed for every electrical line depends on the current loads you need to run on it. What Is the Recommended Size Wire for 30 Amp Breaker? What Happens if I Used the Wrong Length and Wire Size for 30 Amp Circuit?.Other Things You Need to Consider When Installing a 30 Amp Circuit Breaker.What Is the Recommended Size Wire for 30 Amp Breaker?.That is not true unless you are dealing in 3-phase "delta", but you won't have that in a residence. Some people believe that running /3 lets you carry more power. Therefore running /3 cable is a waste of money unless a) the heater says it requires it, or b) you expect in the future to fit something that would require it. Water heaters, A/C and electric heaters usually do not. 3 cable has an extra conductor, allowing 240V and also a middle neutral, making both 120V and 240V available. You usually don't need /3 cable for heaters Otherwise it depends what your loads can tolerate - resistive heaters are very tolerant of voltage drop for instance motors not so much. So below 120' you never have to worry about it. First, nobody cares about drops less than 3%, and that happens at around 120' length (round trip) on most wire sizes. It may be desirable to limit voltage drop by using larger wire than required. Over long distances, wires can have "voltage drop". But you must stay with the breaker size determined by the need of the heater, as we did above. ![]() There are some good reasons to do this, like the possibility of upgrading heaters later. You can use larger wires if you really want to. The minimum wire size for 50A is 6 AWG copper, or 4 AWG aluminum.The minimum wire size for 40A is 8 AWG.The minimum wire size for 30A is 10 AWG.That will be the size of your circuit and breaker. Take your instructions or derated amps number and round UP to the next larger size of 30, 40 or 50. That is because it is a continuous load and runs the wires pretty hard.įor instance, if the heater was 30 amps, multiply that by 1.25 and get 37.5. Now derate that Amps number by multiplying it by 1.25 or 125%. Again you divide that by 240 to get Amps. VA, which on a resistor based heater will be almost identical to watts.You will need to divide by 240 to get Amps (I gather this is a 240V heater). ![]() ![]()
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