electrical - Existing NEMA 10-30R for dryer wired with hot hot

I'd like to change the obsolete unsafe NEMA 10-30R to NEMA 14-30R so that I can safely have a smart splitter switch for dryer and EV charging. Behind the NEMA 10-30R I see 3 wires: black, white (ta

10FT 10/4 SOOW DISASTER RECOVERY <(>&<)> RESTORATION CORD WITH 14-30PAND L14-30R

Wiring 3 wire 220/240 appliance to 4 prong outlet

NemaTech Dryer 3 Prong Splitter, NEMA 10-30P to 10-30R, 10 AWG, 30AMP, 250V and 7,500W Power Splitter for dryer outlet and Tesla Electric Vehicle EV Charging Cable (3 ft) : : Electronics

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POWERFUL DESIGN - GearIT 10 foot, 50A, 125/250V electrical power cord designed specifically to allow you to connect electric vehicle or washer/dryer

GearIT 30 Amp (10 Feet) 3 Prong Dryer Extension Cord NEMA 10-30P to 10-30R STW 10AWG/3 Heavy Duty, RV EV Charging Cable 125/250V

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AC WORKS 1.5ft NEMA 14-30P to NEMA 10-30R 30-Amp 4-wire To 3-wire Grounding Single To Single Black Basic Flexible Adapter in the Adapters & Splitters department at

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20Inch Nema 10-30P to 14-30R Dryer Adapter Cord, STW 10-AWG Heavy Duty 3-Prong Dryer Male to 4-Prong Dryer Female Adapter, 10-30P to 14-30R with Additional Green Ground Wire

🚩【Cord Rating】: 3 prong NEMA 10-30 plug to NEMA 10-30 Receptacle, rated for 125V/250V, 30 amp, support max rate 7500 watt. 🚩【Dryer Power Extension】

RVMATE 3 Prong Dryer/EV Extension Cord 10 Feet, 30 Amp NEMA 10-30P to 10-30R 125V/250V Waterproof PVC Jacket, Perfect for Dryer Power Extension and

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