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Leaving car while charging in public places of NEMA 14-50

SigNC

Active Member
Aug 23, 2017
1,591
1,504
NC
Yes, the public part can be disconnected, however, the adapter is locked (if the car is locked). I was also worried, so I bought this:

CapturePro J1772 Lock
CapturePro Charging Lock for Tesla Model 3
This collar locks the public end to your adapter and cannot be removed unless you unlock the car, or use a strong cutting device.

I believe he's referring to using the UMC on a 14-50, not a public charger with the j1772 adapter.
 

Snow Drift

[Off-Road Assist] Activated
Feb 10, 2016
1,996
1,611
Long Island
I believe he's referring to using the UMC on a 14-50, not a public charger with the j1772 adapter.
Oops, you are correct.

So, basically it is not secure. This adapter cost about $59-79, not huge, but not too cheap to lose it too often...
The CapturePro is for J1772 plug for a public charger like Chargepoint, it is NOT for a Tesla UMC adapter. I misread your OP.

I am talking about using UMC with NEMA 14-50 outlets.
I don't know of a way to secure a UMC adapter. The main device/cord would be locked to the car, but the pigtail adapter could be stolen.
 

eprosenx

Active Member
May 30, 2018
2,076
2,542
Beaverton, OR
Is it dangerous? Can somebody disconnect NEMA 14-50 adapter from the cable while other end of the cable plugged in the charging port?

Unplugging a UMC gen 1 with 40 amps of load or a UMC gen 2 with 32 amps of load would likely result in a decent size arc. It would not be good for the plug or receptacle. I am not sure how dangerous that size of arc would be at 208v / 240v, but it would not be great.

Have you ever unplugged even a 120v plug from say a dryer while it was running? This would be a much bigger arc than that.

But to answer your question, I would not be too worried about charging in public off a 14-50 unless it was a high traffic / high crime area. As others have mentioned, the UMC is locked into the car by its connector. People could always steal the $35 Tesla adapter, but then again, the meth heads can also cut the wire at the car end and strip the copper from the wire to sell...
 
Unplugging a UMC gen 1 with 40 amps of load or a UMC gen 2 with 32 amps of load would likely result in a decent size arc. It would not be good for the plug or receptacle. I am not sure how dangerous that size of arc would be at 208v / 240v, but it would not be great.

Have you ever unplugged even a 120v plug from say a dryer while it was running? This would be a much bigger arc than that.

But to answer your question, I would not be too worried about charging in public off a 14-50 unless it was a high traffic / high crime area. As others have mentioned, the UMC is locked into the car by its connector. People could always steal the $35 Tesla adapter, but then again, the meth heads can also cut the wire at the car end and strip the copper from the wire to sell...
I asked my question wrong. It should be "Is it secure...". I am myself electrical engineer by education, and played with an arc when I was a 13-14 years old at home (in my country voltage was 220V, I limit the current to about 5A including iron or other powerful device in a circuit).
 
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