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

HOT-1.5FT 3 To 4 Dryer Adapter Cord,N10-30P Male To 14-30R Female,250V 30 Amp 10-AWG Dryer Outlet Plug Power Cord US Plug - AliExpress

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

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NEMA L14-30p to NEMA L6-30r 30-AMP 4-Wire to 3-Wire Grounding Adapter - China NEMA L14-30p to L6-30r Plug and NEMA L14-30p to L6-30r Adapter

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NOMA 4-ft 10-in 30-Amp 4-Wire Dryer Power Cord, Black

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Eaton Wiring 30 Amp NEMA 10-30R 125V/250V Dryer Flush Power

ELEGRP 30 Amp125V, NEMA 10-30R Surface Mount Power Outlet, Single Straight Blade Range and Dryer Outlet Non-Grounding, Black 2203 - The Home Depot

Shop Cable Matters 4 Prong Dryer Cord 10 ft 30 AMP Appliance Power Cord with Dryer Plug, Dryer Power Cord - 10 Feet NEMA 14-30P to 4-Wire online at a

High-Quality 10 ft 30 Amp Dryer Cord | NEMA 14-30P to 4-Wire Connection | Heavy Duty & Safe | Easy Installation & Strain Relief

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thinkstar 3 Prong Srdt Dryer Cord 10 Feet, 30 Amp Appliance Power Cord (Nema 10-30P To 3-Wire), 3 Wires With O Ring Terminal Connect…