Delivery date is coming. I am currently installing the Nema 14-50 receptacle with 40 amps breaker. The UMC should just connect. Right? Looks like you are in SoCal perhaps you are with So Cal Edison. I am searching to see if there's any rebate or discount on charging.
I think there's some rebate for that. The question here is if you get the tesla wall connector, you can't just plug the wall charger to the Nema 14-50 receptacle. Anyone have any suggestion? Perhaps go with some other wall charger and just be able to plug it into the Nema 14-50 receptacle.
While it is code compliant to install a NEMA 14-50 on a 40 amp breaker (if you are only planning on using a 32 amp UMC Gen 2), I would generally not recommend this unless you already have the wire in place that you are trying to re-use. I generally recommend installing wire capable of 50 amps and a 50 amp breaker.
If you get a Wall Connector, I would recommend just hard wiring it in per the instructions. I don't understand the desire to plug them in?
The NEMA 14-50 outlet should be installed with a 50A breaker, not 40A. Here is Tesla’s installation guide:
https://www.tesla.com/sites/default.../NEMA_14-50_installation_guide_NA_US_2017.pdf
It is within code to install a NEMA 14-50 receptacle intended to be used with a UMC Gen 2 (32 amps continuous) on a 40 amp rated wire and breaker. Though I generally would not recommend going that route (I would future proof with a full 50 amps).
Though now that I think of it more, NEC also says you must follow manufacturers installation requirements and so the question is: Does the doc linked to above apply and mean you have to install 6 AWG and a 50 amp breaker? I think the answer is no since the UMC is not a device that falls under NEC since it is not hard wired in. It falls under UL rules. If we were talking about a Wall Connector that might be different.
The wall connector is not UL listed for adding a pigtail to plug into a 14-50. Sure, it can be done and some do. Be absolutely sure to use the correct wire gauge pigtail and keep it as short as possible. Insurance isn't always happy if things aren't all done to code and UL listed as applicable.
If your putting in a 14-50, why not just use the included portable connector?
I don't understand the desire to put Wall Connectors on pigtails here on the forums. To the point
@brkaus made, yes, the Wall Connector is NOT LISTED for adding a pigtail. NEC says you need to follow manufacturers instructions and this is deviating from this. It also says pigtails are not allowed on permanently installed devices. Furthermore, even for devices they are allowed on, they can't be more than 12 inches long.
On the comment about using the UMC Gen 2: The downside of that is that it only goes to 32 amps where the Wall Connector can do more.
And finally, if installed with a pigtail into a 14-50 then the max output of the Wall Connector must be 40 amps or less. In my case, I ran #6 wire in conduit and so by hard wiring that into my Wall Connector I was able to put it on a 60 amp circuit and charge at up to 48 amps which is the max my Model 3 can take.