Wall charger wiring

Wall charger wiring

I am on the last steps of attaching a wall charger, and I'm having trouble with the screws on the green L1 and L2 terminal block. They tighten just fine, but don't grip onto the wires from the top mount and the wires can slide right out.

I'm shoving the wires in so far that you can only barely see the yellow part of the wires and they still don't stay when the screws are tightened.

Any ideas on what I'm doing wrong?

jlquinn | 27. November 2018

I think you're talking about the wires with square terminals on the ends. With those, I really had to back the screws out far, then shove the wire ends in as far as possible. It took me a couple times to get it right.

jxg3950 | 28. November 2018

I am indeed talking about the square terminal wires. As I mentioned, I shoved them all the way in where the yellow coating at the end was not visible, but it still wasn't enough.

DanFoster1 | 28. November 2018

The back of the saddle moves away from you when you loosen the screw; tightening the screw pulls the back of the saddle towards you and clenches the wire. When the saddle is loose, you can easily miss—especially since the wire is thick and hard to bend.

If you still can’t get it by feel, get a cheap dental mirror from the drug store and use it to watch the saddle move while you turn the screw—you’ll see see where the wire goes for sure. Good luck!

jxg3950 | 29. November 2018

That is some primo advice. Thank you!

bp | 30. November 2018

Tesla provides specifications on the amount of torque to be applied for the posts. When Tesla installed our Gen 2 HPWC, I believe they not only took measurements, they also took photographs of the measurements to document they had made the connections correctly.

Especially if you're going to run high amps through the HPWC, improperly connecting the HPWC to the power cables could pose a safety/fire hazard.

When our first HPWC was installed, the first breaker it was connected to melted, because it had not been properly seated by the electrician during installation...

DanFoster1 | 01. Dezember 2018

@bp: indeed, it is important to seat and torque the connections properly—sounds like your electrician was extremely careless at the breaker side, I wouldn’t hire that guy again!

The Tesla Wall Connector monitors the temperature at the terminal block, and will dial back the charging current if it’s too hot—so not much risk on the wall connector side. Of course there is no such safety on the breaker side, but those connections are made while holding the breaker in your hand, outside the panel where it’s easy to see. It’s surprising and discouraging that an /electrician/ messed this up for you.

mattjurek | 02. März 2019

My terminal block melted so it doesn't measure temperature well!

DanFoster1 | 03. März 2019

@mattjurek, unlikely, since the terminal block is designed to carry more current than necessary. More likely, the wire was under specification for the amperage, so the wire melted. | 04. März 2019

Temperature is measured in the Tesla side of the connector - not the wall connection. I think Dan hit on the issue. Two other reasons - improper mix of aluminum wire and incompatible receptacle, or the connections at the receptacle were not properly torqued. Might be time for a different electrician to fix the problem.