Tesla Wall Charger.
My client, the CEO of a fitness and health food company, wanted a Tesla wall charger installed at his industrial unit. Simple, you might think? Bit of wire, bolt it to the wall, nice and tidy.
Except, the new 18th edition amendment 1 regulations for BS7671 have quite a lot to say about electric vehicle chargers. Such as, you must have the device separated from the main building earth. And you must install a separate earth rod. And you must have a special ‘Type B’ Residual Current Device (RCD).
Also, the client wanted a fast charger, which means 3 phase wiring. And he wanted the charger on the wall at the furthest point in the building from the incoming supply and fuse board.
So, here’s what we did:
This is the wall where the cable run would be - charger to be on the left hand side.
Checking the services, as the earth rod goes down 1.5 metres
And the water...
And the gas. Definitely don't want to hit the gas with the earth rod.
The water incomer to the building handily has a wooden cover on it already, otherwise it would have had to be insulated.
There's plenty of room for the 32A 3 phase breaker.
The cable will run in the existing air conditioning cable tray
along here...
and around here
The 3 phase breaker is fitted - Schneider Square D, special order.
And the Type B RCD in a separate box.
Cable wrangling, in a hollow wall - 45 metres of cable were pulled through.
More cable pulled through...
The labourer starts to dig the earth rod hole...
And we're on the last bit of laying in the cable to the tray...
Measured resistance R1+R2 is 0.33 ohms. All good!
Setting the Tesla wall box to 32 amps.
Testing the 3 phases of the charge point with a special meter adapter.
Testing the earth rod impedance - 59 ohms is within spec.
Wiring in the earth rod.
Making good the hole for the earth rod.
Finished isolator and rod.
And the CEO's Tesla, ready to go!
Tidy.
Not forgetting the labels! I love labels.