Product review (4 stars): EV Charging in the Mountains
I bought this receptacle to construct a 30-amp extension cord.  It was easy to assemble and has served me well.  With this receptacle and cord I may recharge my electric car using the drier outlet at a relative's remote location in the foothills of the Sierra Nevada mountains.  Note: To handle an 80% load (24 amps), it must be wired using at least wire at least as large as 10 AWG.