Choosing between a 15-amp and a 20-amp breaker depends entirely on the gauge of the copper wire installed in the wall and the specific electrical load requirements. Under National Electrical Code (NEC) regulations, 15-amp breakers must be paired with 14-gauge wire (typically used for standard lighting and general-purpose bedroom outlets), while 20-amp breakers must be paired with thicker 14- or 12-gauge wire (used for kitchens, bathrooms, and heavy appliances).
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