EVSE NEMA 10-30 plug and cable getting pretty hot - is this normal?

Discussion in 'Hyundai Kona Electric' started by BlueKonaEV, Aug 22, 2019.

  1. BlueKonaEV

    BlueKonaEV Active Member

    If I have the option to return for a refund, I'll probably do that and get a hard wired Juice Box
     
  2. BlueKonaEV

    BlueKonaEV Active Member

    I'm in contact with Mustart right now. They are very responsive. They are asking many questions..
     
  3. BlueKonaEV

    BlueKonaEV Active Member

    UPDATE: I've been in communication with Mustart and last night, the cable exiting the 10-30 plug went up to 95.5 C. They asked me to send the EVSE back to them and they will replace it. They are going to send me a shipping label, so I won't have to pay for the shipping back to them.. Glad that they stand behind their product.. Now, the question is on how will I charge while I'm waiting for the new EVSE?? I guess I will have to rely on the free chargers in downtown..
    The 120 Volt EVSE that came with the car won't cut it as I drive more per day than the EVSE can replenish.
     
  4. electriceddy

    electriceddy Well-Known Member

    Sounds like a bad crimp (if they use them) hopefully the replacement will be better.
     
  5. BlueKonaEV

    BlueKonaEV Active Member

    I sent them another e-mail if they can exchange it for the 32 amp version with the 14-50 plug as it is a "safer" plug due to the ground wire.. The 32 amp version of the EVSE is actually cheaper on Amazon than the 26 amp NEMA 10-30 version.
    Changing the outlet to 14-50 is fairly simple.. probably $20 in materials and 30 mins of work.. I believe that #8 wire is still fine for the 32 amp EVSE.. However, I believe that by code I'm required to go with a 50 amp breaker on a NEMA 14-50 outlet even though 40 amp would be sufficient for the 32 AMP continuous load.
     
    electriceddy likes this.
  6. victor_2019

    victor_2019 Active Member

    at 50-55 C you should not be able to hold your hand on the connector for very long without actually burning your hand. you would get a 2nd degree burn in 17 seconds at 55 deg C and a third degree in 30 seconds.

    http://antiscald.com/index.php?route=information/information&information_id=15

    are you sure it's that hot?

    it's definitely not normal.

    I've never had any plug designed for an appliance get even warm to the touch.
     
  7. electriceddy

    electriceddy Well-Known Member

    Code is minimum protection, 40 amp is fine.
     
  8. BlueKonaEV

    BlueKonaEV Active Member

    Actually, the 10-30 plug went all the way to 65 C and the cable exiting the plug went to 95 C.. Returning the EVSE tonight and they will send me a replacement.. Would be nice if they can exchange it for the 32 amp unit with the 14-50 plug.
     
  9. BlueKonaEV

    BlueKonaEV Active Member

    Well, considering that the 14-50 outlet is rated 50 amps, other devices could be plugged in to that outlet and if any of those devices pulls more than 40 amps, it would trip the breaker..
     
  10. BlueKonaEV

    BlueKonaEV Active Member

    Got the return label and will return the EVSE in the morning.. Looks like they will try to get me an 32 amp EVSE with the 14-50 plug but they can't guarantee it but it doesn't matter. A replacement 26 amp for the 10-30 plug would be just fine as long as it does not get as hot.
     
    Bugblndr likes this.
  11. BlueKonaEV

    BlueKonaEV Active Member

    Sent my EVSE to Mustart yesterday and they are sending out a new one with 32 AMP/NEMA 14-50 today.. Hopefully I'll get it on Saturday...
    I'll change my outlet to 14-50 tonight. May also rewire with #6 or #4 wire instead of #8, just to be safe..
     
    Last edited: Aug 29, 2019
  12. R P

    R P Active Member

    Sounds good. I would go with a 40 amp breaker (OK with #8) for safety. And changing to #4 wouldn't be easy as it is quite a job to install (does not bend easily).
     
  13. BlueKonaEV

    BlueKonaEV Active Member

    #4 is a pain but #6 isn't much different than #8.. I'll probably leave #8 wire for now as I have no intention of exceeding 32 amps but I may upgrade in the near future as I could use the outlet for my welder too. Currently, I'm using my welder on 120 volt and it doesn't have a lot of power... I can change it to 240 Volt when I need to weld thicker materials.. I don't really weld too much but I do have damage to my riding mower's deck and I need to weld it and with 120 Volt, it doesn't work too well..
     
  14. R P

    R P Active Member

    I could be wrong, but doesn't the use of a 32A EVSE require a 40A breaker (instead of 50)? I also have a welder but have it wired on a separate 50A circuit. It uses a different outlet, 3 wire, no neutral.
     
  15. BlueKonaEV

    BlueKonaEV Active Member

    I'm not sure. The NEMA 14-50 really is a 50 amp outlet and I'd think that a 14-50 outlet would have a 50 amp breaker. It's just like a regular 120 volt outlet.. You don't use a 5 amp breaker if your cell phone charger is only 3 amp maximum.. You'll still leave the 15 or 20 amp breaker. In my house, all 120 Volt outlets are actually on 20 amp breakers. I wonder if there is a different rule for EVSE's that you require a breaker specific to what you connect to the outlet. The danger I see is in case you sell the home and someone plugs in something with a higher load, it will trip the breaker. I'm not sure what the requirements for that are.
    For now, I'll leave the #8 wire and 40 amp breaker.. All I need to change is to wire the ground and run it through the conduit to the new 14-50 outlet.
     
    Bugblndr likes this.
  16. apu

    apu Active Member

    The minimum building code places limits on circuit breaker current rating according to the conductor size being used and not based on the max capacity rating of end receptacle(at least as far as I appreciate). So yes theoretically #6 or 8 copper wire, especially short of a run as you have would be fine with a 50 amp breaker. That said when a circuit breaker is installed you should also give consideration and size that breaker so it will protect both the equipment (EVSE) in the circuit and wire. Unless you really think you will be using 50 amps you should probably size down to the 40 amp breaker.
     
  17. electriceddy

    electriceddy Well-Known Member

    I always size the breaker for the load offering best o/c protection for the equipment, the minimum protection as per code is to protect the wire.
    What does the installation instructions from the manufacturer quote for Min/Max circuit ampacity- this takes priority;)
     
    apu likes this.
  18. BlueKonaEV

    BlueKonaEV Active Member

    So, I left the 40 amp breaker and ran the ground wire to the new NEMA 14-50 outlet. Had to increase the size of the conduit to 3/4 as I couldn't fit the ground wire through the 1/2 inch..

    20190829_182409.jpg 20190829_183953.jpg
     
    Bugblndr, KiwiME and electriceddy like this.
  19. BlueKonaEV

    BlueKonaEV Active Member

    Got my replacement 32 Amp EVSE and tried it for a minute.. Dash shows 7.5 kw speed.. Awesome. Hopefully, this one won't heat up like the 26 amp version. 20190905_160629.jpg
     
    Bugblndr likes this.
  20. electriceddy

    electriceddy Well-Known Member

    That's excellent news, no more having to charge at local machines. Is it the same manufacture as before?
    As you are aware it will take more than 1 minute to show signs of heat
     

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