Will 10-50P Plug work with Tesla Wall Charger?

[Mrbrock]

What are you seeking to gain by using the wall connector wired to a plug vs using the UMC? It would seem if you are set on doing this, you should install the wall connector in place of the 10-50R receptacle and hard wire it instead of adding a pigtail and 10-50P plug to the wall connector and plugging it in. As far as basic charging functionality, they are the same and you are paying $200 more to use the WC vs the UMC. And if you want to keep the functionality of your outlet, the UMC is design to be plugged in. And you have been using it for 20 months so you know it works.

 

[wws]

The neutral from the 10-50 will only "look like a ground" if it is in fact connected to the HPWC ground lug. Since the HPWC does not actually connect to neutral, connecting the 10-50 neutral to the HPWC ground does look like a legit 240V with ground connection to the HPWC. AS LONG AS THE NEUTRAL IS IN FACT GROUNDED AT THE PANEL. It's extremely important that you verify the 10-50 neutral is in fact grounded, and there are no 120V loads or connections on this circuit, otherwise an electrical fault could result in your Tesla becoming electrically hot, with the obvious very bad potential consequences.

More specifically: The only time the neutral should be bonded to the safety ground is at the main panel. If there are any sub-panels between the main panel and the receptacle, the neutral should NOT be bonded to ground.

Typically a 10-series receptacle was installed where BOTH 120 and 240V were needed. For example in a kitchen range or clothes dryer where the heat coils run at 240V and the timer controls, lights, and whatnot run at 120V. Since the 1996 NEC, all new construction is supposed to use 14-series receptacles for such uses - which include a properly wired safety ground.

If you are re-purposing an old 10-series receptacle and 120V is no longer needed, the easiest thing to do is replace the receptacle with a 6-series (hot/hot/safety ground). In the breaker panel, move the white (neutral) wire to the safety ground bus. Then wrap both ends of the white wire with green tape to indicate its new role.

 

[rrolsbe]

Just wanted to report back to this thread to confirm the Gen 3 Connector works fine attached to a 10-30 circuit via two 6AWG wires attached to the L1/L2 lugs and 8 AWG wire to the Gnd lug. I configured it to a max charging current of 24A and attached it to the wall using the supplied screws. I drilled out the mounting plate so the screw heads just clear and made a notch above each opening to allow the mounting bracket to be slide down. Mounting it this way makes the unit somewhat portable might come in handy if I ever need to level 2 charge to the max 48A (This would require direct wiring or a 60A receptacle like a 14-60R)

I hope more features become available later via future firmware updates. The wand side cable on the Gen 1 and Gen 2 Wall connectors are field serviceable and Tesla shipped many with a J1772 connector/cables attached; likewise, many vendors sell them with the J1772 interface. Does anyone know if the Gen 3 is field serviceable and could utilize the J1772 interface? I searched the internet for a someone that might of opened up the Gen 3 unit but did not find anything. Any info regarding field servicing or the internals of the Gen 3 unit would be greatly appreciated.

Thanks to all for your thread responses!
Regards, Ron

 

[Mrbrock]

Just wanted to report back to this thread to confirm the Gen 3 Connector works fine attached to a 10-30 circuit via two 6AWG wires attached to the L1/L2 lugs and 8 AWG wire to the Gnd lug. I configured it to a max charging current of 24A and attached it to the wall using the supplied screws. I drilled out the mounting plate so the screw heads just clear and made a notch above each opening to allow the mounting bracket to be slide down. Mounting it this way makes the unit somewhat portable might come in handy if I ever need to level 2 charge to the max 48A (This would require direct wiring or a 60A receptacle like a 14-60R)

I hope more features become available later via future firmware updates. The wand side cable on the Gen 1 and Gen 2 Wall connectors are field serviceable and Tesla shipped many with a J1772 connector/cables attached; likewise, many vendors sell them with the J1772 interface. Does anyone know if the Gen 3 is field serviceable and could utilize the J1772 interface? I searched the internet for a someone that might of opened up the Gen 3 unit but did not find anything. Any info regarding field servicing or the internals of the Gen 3 unit would be greatly appreciated.

Thanks to all for your thread responses!
Regards, Ron

Sounds great that it’s working for you. I guess I am still confused as to whether you direct wired to a circuit that had a 10-30R outlet or if you wired a pigtail with a 10-30P and plugged that into the receptacle.

A couple things to note. You only need 10ga for 30 amp. That is likely what is in the wall to the receptacle (if that’s what you did). It is doubtful you could swap a 60amp receptacle for your 30amp one as you would likely need to rewire all the way back to your panel with larger wire and proper L1/L2/N/G that 14 series receptacles require.