In Europe you may find quite often a power outlet (wall outlet) without "earth"
contact, so, this contact is not necessary. You find extension cords with only
two wires. The third ("earth") contact has only the purpose to protect you. In
Germany you find often a particular fuse interrupting the tension, if a current
above 10 mA flows over the earth contact. I'm sure this is also the case in
other countries.
I think that the problem Mats Lewan is talking about is not a big problem.
Because usually one contact is connected to earth. If someone would connect the
two main wires with each other and use the "earth" contact as "return", this
may work, and you may "smuggle" a current if you are checking the current only
in one of the two cables. It would require a hidden modification of the power
outlet, and you would not be able to measure a tension between the two main
contacts. But Lewan was able to measure the tension. The current in the "earth"
cable would then be the sum of the two currents. It would be a massive fraud! I
don't believe that.
No, I think the problem is elsewere: what about the second heating resistor,
Lewan talks in his video? Was it completely disconnected? If not, could it be
used or not?
Did Mats Lewan checked all the time the current? He used no automatic recording
of the current. For instance, when he went in the second room: I think he was
not able to check the current.
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