General

NEMA 14-50 Failure

I have a new construction home (3 years old) that I had the contractor install a NEMA 14-50. In the middle of the night I was notified that my car (Model 3) had stopped charging. I didn't know what the issue was as that is not presented through the mobile app. I tried to restart the charging process through the app, but it kept shutting off. The next morning I went into the garage to investigate and found that the receptacle on the NEMA 14-50 was charred. I switched off the double pole switch adjacent to the outlet and then flipped the breaker. Once I took apart the outlet, the extent of the damage was made fully aware. One of the poles did not have a solid contact and caused excessive heat to build up inside the receptacle. Luckily the charger was a Gen 2 Mobile Connector which has a built in temperature probe on the plug. This stopped a potential fire as neither the breaker or fuses tripped.

Comments

  • I meant to add a picture to the post but can't seem to edit the OP
    <img src="https://i.imgur.com/HjSCZ2g.png" width="100%" />
  • @jdelmore,
    This is a fairly common problem with using traditional electrical outlets for EV charging. Folks who install the traditional outlets often do a poor job at tightening the screws. I've the same thing you report happen to standard 5-20 120v electrical outlets as well.
  • perhaps the best review on youtube for 14-50 receptacles

    https://www.youtube.com/watch?v=xRcDUZgeuGs

    you get what you pay for
  • Spoiler alert for above mentioned review video....

    Hubbell
    https://www.amazon.com/Hubbell-Wiring-Systems-HBL9450A-Specification/dp/B00IPBMUKY/ref=as_li_ss_tl?crid=3FICM4GPEPF5O&dchild=1&keywords=nema+14-50+outlet&qid=1585055540&sprefix=nema+14-50,aps,137&sr=8-7&linkCode=sl1&tag=ha0d9f-20&linkId=062b6d1453cd80d205ac0ddea9cf87a7&language=en_US

    it will cost you, but your catastrophic failure could have easily resulted in a fire - you can imagine the rest from there.
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