Pa še razlaga, zakaj dela probleme samo Volt in ne recimo Ampera:
The USA 240 VAC comes out of either end of a transformer secondary (the output of the transformer). The secondary is centre tapped and that is grounded (somewhere). So the two 240 VAC wires have the same potential with respect to ground as each other but they are 180 degrees out of phase - this is sometimes called balanced.
They get 120 VAC by using either end of the 240 VAC secondary and grounding the neutral somewhere (at the switchboard?) - but that's not important here.
Australian 240 VAC comes out of a transformer the same as the USA BUT there is no centre tap. In Australia the neutral side is grounded at the switchboard.
So....
In both countries, the two 240 VAC wires go through an RCD. It measures the difference in current between the two wires. If there is no path to ground then all is well - well almost...
In the USA you could apply a load from either wire to ground without tripping the RCD BUT the load would have to be the same. If you try that in Australia the RCD would trip because there would be very little current to ground from the neutral wire (if any) and a lot from the active wire because it is 240 VAC above ground.
This might be why GM Volts trip RCDs. The input EMI filter in the car probably assumes it will be fed with balanced 240 VAC and it's designed accordingly.
The USA 240 VAC comes out of either end of a transformer secondary (the output of the transformer). The secondary is centre tapped and that is grounded (somewhere). So the two 240 VAC wires have the same potential with respect to ground as each other but they are 180 degrees out of phase - this is sometimes called balanced.
They get 120 VAC by using either end of the 240 VAC secondary and grounding the neutral somewhere (at the switchboard?) - but that's not important here.
Australian 240 VAC comes out of a transformer the same as the USA BUT there is no centre tap. In Australia the neutral side is grounded at the switchboard.
So....
In both countries, the two 240 VAC wires go through an RCD. It measures the difference in current between the two wires. If there is no path to ground then all is well - well almost...
In the USA you could apply a load from either wire to ground without tripping the RCD BUT the load would have to be the same. If you try that in Australia the RCD would trip because there would be very little current to ground from the neutral wire (if any) and a lot from the active wire because it is 240 VAC above ground.
This might be why GM Volts trip RCDs. The input EMI filter in the car probably assumes it will be fed with balanced 240 VAC and it's designed accordingly.