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The maximum wattage that a 30 amp breaker can handle is 30 x 230 = 6900 watts. Other variables come into play and this number will decrease depending on the load, duty time, and difference in voltage fluctuation.

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The connected load in watts to a single pole 30 amp breaker is calculated by the following equation. W = I x E. Watts = Amps x Volts. A higher wattage than what you calculate will trip the breaker.

Also another equation you should be familiar with, for breaker sizing if only the wattage is given on the nameplate, is that for amperage from watts. I = W/E. Amps = Watts/ Volts.

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Q: How many watts can a double 30 amp breaker switch handle?
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What is the wire size required for 1800 watts for lamps?

14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.


What amp breaker should you use with 3700 watt element?

To determine the appropriate amp breaker for a 3700-watt element, you can use the formula: Amps = Watts / Volts. Assuming a standard voltage of 240 volts, the calculation would be 3700 watts / 240 volts = approximately 15.4 amps. It is advisable to use a 20-amp breaker for safety and to accommodate any inrush current, ensuring the breaker can handle the load without tripping.


Can you use 14 wire for a light off a 20 amp circuit?

Yes, in home wiring as long as it is protected by a 15 amp breaker. Remember this circuit will only handle 1800 watts and cannot be loaded to any more than 1440 watts. So if each light is 75 watts then the maximum you can install is 19.


Should a hot water heater be put on a 30 single or 30 double amp breaker?

What governs the type of breaker is the voltage and wattage of the heater elements. If the tank is 120V then you would only use one breaker. The size of the breaker you use will depend on the watts of the element. Watts = amps x volts, Amps = Watts/ volts. Once you establish the amperage then size the wire and the breaker to fit. If the tank is 240V the same rules apply only you would use a 2 pole breaker. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS. If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicatorto insure the circuit is, in fact, de-energized.


Will 20 amps handle 3500 watts?

No. 20 amps at 120 volts will handle a maximum of 2400 watts. And you should never continuously load a 20 amp 120 volt circuit to no more than 1920 watts.