What gauge extension cord do I need for a 240V dust collector?

Stick with 10-gauge (10/3) cord with NEMA 6-50 connectors for runs under 50 feet. Your dust collector pulls serious amperage at 240V, and 10-gauge handles 40+ amps without voltage drop or overheating. For longer runs, step up to 8-gauge. Don’t use 12-gauge cords meant for 120V tools — that risks a melted plug or a hot, slow motor.