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== == There is not enough information given to properly answer this question. We need to know the voltage for the heater. We can then apply ohm's law to find the amperage to find wire size. If the circuit is 120 volts then 1500 watts / 120 volts = 12.5 amps. The National Electric Code requires elecric heating circuits to be considered a continuous load so you must increase the required circuit by 25%. In other words 12.5 amps x 125% =15.625 amps. This would require a 20 amp / 120 volt circuit using #12 copper wire. If the heater requires 240 volts the formula for calculation is the same with a circuit requirement of 15 amps / 240 volts using #14 copper conductor.

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15y ago
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9y ago

A standard 15 amp 2 pole circuit breaker using a feeder of #14 AWG will work fine in this scenario. Amps = Watts/Volts = 1500/230 = 6.5 amps.In a home setting up to two 1500 watt heater can be installed on a two pole 15 amp breaker.

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10y ago

use 20 amp single pole and 10 gauge wire that will give you 2200 watts that will be good

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14y ago

Depends on your supply voltage. I = P/V. Find out your supply voltage and divide it into 1500. This will give you your heater's current draw in amps.

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11y ago

You need 12.5 Amps. For a continuous load you want to only have 80% of the current which would be 12 Amps. Best to go with a 20 Amp breaker.

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9y ago

That is a load of 6½ amps. You should use at least 1 mm2 cable and preferably 1.5 mm2 which is the standard cable for a spur with a 13 amps fuse.

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10y ago

AWG 12/2 with ground on a dedicated circuit with a 20 amp breaker. That will safely supply 1920 watts of continuous power.

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Q: What size wire for 120v 1500 watt heater?
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