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Is it safe to use an extension cord with 220V? - Quora
What are 1-phase and 3-phase AC power connectors & standards?
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AC WORKS 25 ft. SOOW 12/5 NEMA L21-20 20 Amp 3-Phase 120-Volt/208-Volt Industrial Rubber Extension Cord L2120PR-025E - The Home Depot
Step-by-step Guide to Make 220v Extension Cord at Home
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Is it safe to use an extension cord with 220V? - Quora