While charging my electric vehicle with this Enel X JuiceBox 40 charger, a burning plastic smell was noted. Upon examining the Enel X charger plug that was attached to my home's NEMA 14-50, it appeared partially melted and very to touch. Using a towel, the plug was removed and a small fire and sparks flew out of the NEMA outlet. The right half of the outlet's plastic shell was melted and the inner metal was charred. Same charring and melting was noted on the corresponding side of the Enel X plug. I turned the circuit breaker off and the sparks and fire subsided. Model of JuiceBox: 2JBO401RNA-PJWX-300