Using a temporary flexible extension cord as a permanent substitute for professional in-wall Romex wiring is strictly prohibited by the National Electrical Code and constitutes a severe fire hazard. Extension cords are engineered exclusively for temporary, intermittent power delivery and lack the thermal insulation, mechanical protection, and secure anchoring required for permanent building wiring. Running extension cords behind drywall, under rugs, or through doorways creates hidden friction, trapped heat, and dangerous electrical arc-flash risks.
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