To maintain proper voltage and prevent excessive line loss, standard 12/2 copper wire on a 20-amp circuit should not exceed a total run length of 50 to 100 feet from the breaker panel to the final load. The National Electrical Code recommends keeping total voltage drop under 3 percent. For runs exceeding 100 feet, electricians typically step up to a thicker 10/2 gauge wire to compensate for electrical resistance over extended distances and prevent overheating.
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