Installing my 240V Electric Vehicle charger and extra 40A breaker

A couple of months ago I bought a Nissan LEAF. It comes with a trickle charger you can connect to your 110V outlet but it takes a bit of time to completely charge your car (over 12 hours). I leased the car with a fast charger pack which makes it possible to charge the car in a couple of hours if you have a 240V charger.


I decided I wanted to install this myself. I bought a Bosch EL-51253 Power Max 30 Amp charging station with 18’ cord. I also bought a NEMA 14-50R outlet I wanted to put in the wall. And I bought a Electric WX9X35 4-wire Range cord to connect to the charger so I could plug it in the wall.

Connecting the range cord to the charger is easy. Open it up on the back and connect 3 wires (you only need 3, the white wire isn’t used because only 3 wires go from the breaker to the NEMA outlet).


The 240v connection wasn’t that hard. Most of the time I used to figure out what the exact rules are here in the US. It’s a bit different compared to the Netherlands (Yes I read the NEN1010 in NL when I was in school). I did a lot of research online to figure out what is allowed or not. I requested a permit (this is different per area, even Redmond and Bothell are different, some areas you go to the power company, some you go to the city. For Bothell I needed to go to the city and pay around $60) and after everything was hooked up, somebody from the city came by and approved the installation. (You don’t want to fight with your insurance when your house burns down because you made a mistake Winking smile)

First I needed an extra breaker in the outlet panel. This house is a new build so the panel is new. I could just add an extra 40A breaker. Here in the US they use 110V outlets although 240V comes into the house. The breaker for your dryer is also 240V.

After I switched of the main breaker I added the new breaker. (btw, although the main breaker is switched off there is still current on the main thick feeder line at the top of your breaker box!). Just make sure you use a breaker which fits on the panels connectors.


Adding the breaker in the panel is easy, just click it in.


That was the easy part


I was lucky I wanted the outlet really close to the breaker panel. I bought some materials at Home Depot and started working. I used this wire which allows 55A and in the wall usage. First I needed to cut out the hole in the wall.


Opened up one of the holes in the panel to feed the wire


Make sure you put in this plastic ring before you feed the wire (you need this if you want to get the permit approved afterwards)


Strip the wire and feed it to your breaker and attach the ground to the ground block


Feed the wire to the outlet (only 2 wires and 1 ground)


Connect the NEMA connector, I connected the ground and the 2 L wires.


Et voila, done


I am happy with the result Smile


Update: Although my charger doesn’t use it, I would recommend adding the extra wire from the breaker to the NEMA plug and just connect it (neutral wire goes into the neutral bar). So for future use the NEMA connector is wired completely and would save some frustration of you use it in the future but forgot 1 wire was missing 🙂