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You need to figure the current circuit load in watts to see if it can handle additional use. The National Electric Code is 20 percent less than maximum. This means a 15-amp circuit has a safe capacity of 1,440 amps. A 20-amp circuit limit is 1,920 amps, a 25-amp circuit’s limit is 2,400 amps and a 30-amp circuit has a safe limit of 2,880 watts.