Submitted by MuirWoods on Fri, 2018-01-19 06:32
I'm (im)patiently awaiting delivery of my Model S having suffered two delays. In preparation, I had a Tesla Wall Charger installed yesterday and thought I should pass on the installer's warning. I'm sure this will be known and understood, but better safe...
I'm in the UK, but the same principle will likely apply elsewhere. I'm on a single-phase rural electricity supply which has the earth derived from neutral. There's no separate earth. The installer put in an RCCD so that power to the charger will trip if a leakage to earth is detected. However, he was concerned that, in certain fault situations, the power will attempt to make an earth connection through the car and/or anyone touching it. He decided that it would probably be necessary to fit an earth rod, but checked with the UK electrical standards body to be sure. They agreed with his assessment. He suggested that I make others aware of the need for this earth connection when the incoming supply is live and neutral only.
I'm sure there are many of you are far more expert than me on the subject - that wouldn't be difficult - and I hope you'll correct me if I'm not entirely accurate with my explanation. But the installer didn't want any harm coming to me or the car. I'm not sure what his order of importance was.
So now I have a shiny new wall charger with a nice green light on it, but the space beside it is curiously still empty. I'm counting the minutes.