![]() How to calculate breaker size, wire size and wattages? The corresponding size for 60 amp is a wire gauge size 4, however there are certain important assumptions that that rule of For a 40 amp you need a 8-gauge wire size and for a 20 amp, you will need a 12-gauge wire size. The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right size to go with. What kind of wire do I need for a 30 amp circuit breaker? But it also says maximum draw is 13,200 watts on 120/240, so doesn’t that mean a 40-amp breaker would be inadequate? By my math, max wattage on a 40-amp circuit is 9,600, de-rated to 7,680. My new range says it needs a 40-amp circuit breaker minimum. Is a 40 amp breaker enough for my new range? Good call, since some better stoves/ranges want 50A or even 60A, and #6 is good for all that. 6 AWG is larger than 8 AWG, so you are ducky-doo with the #6. On a 40A circuit you are allowed to use any cable 8 AWG or larger. Can I use 6 gauge wire on a 40 amp breaker? The manufacturer also requires a 30 amp breaker. The receptacle is rated for 30 amps and cannot be protected by a larger amperage breaker. It is not OK to use a 40 amp breaker for a dryer outlet. A 40 Watts bulb is capable of drawing 0.36 Amps to operate. Yours is over this so bumping up to a 50A would be required. According to the NEC, any household cooking appliance rated at 12kW or less can be served by a 40A circuit. ![]() What requires a 40 amp breaker?ģ Answers. What is a 40 amp breaker used for?ĭouble-pole breaker The 15-amp and 20-amp breakers often handle baseboard heaters, 30-amp serve water heaters and electric dryers, 40- and 50-amp are for electric ranges, and the 70-amp could serve a large air conditioner or a subpanel. A 40-amp breaker could potentially allow unsafe levels of electricity to travel through that circuit and never trip until the flow reaches 40 Amps. ”Ĭan I run a 30-amp appliance on a 40-amp breaker?Ī 30-amp circuit uses wiring that can only handle 30 Amps of electricity, which means anything over 30 Amps flowing through that circuit will cause the wires to heat up. Many techs will repeat these rules of thumb and rely on them in all circumstances: “Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor. What size breaker do I need for a 40-amp circuit? How many watts is 40 amps at 120 volts?Įquivalent Amps and Watts at 120V AC Current How many watts is a double pole 40-amp breaker?Ī 40-amp circuit is equivalent to 9,600 watt.
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