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Is there is a Standard on how much main service panel / main circuit breaker amps should be? - Home Improvement Stack Exchange
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Siemens QT 30-amp/30-amp 4-Pole Quad Circuit Breaker in the Circuit Breakers department at Lowes.com
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Square D Homeline 20-amp/20-amp 1-Pole Tandem Circuit Breaker in the Circuit Breakers department at Lowes.com
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Eaton Cutler-Hammer - 100 Amp, 250 VDC, 480 VAC, 3 Pole, Molded Case Circuit Breaker - 04883112 - MSC Industrial Supply
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Schneider Electric - 40 Amp, 440 VAC, 2 Pole, DIN Rail Mounted Miniature Circuit Breaker - 56838287 - MSC Industrial Supply
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Paneltronics 'A' Frame Magnetic Circuit Breaker - 30 Amps - Double Pole: Amazon.com: Tools & Home Improvement
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