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The danger when using dangerous voltages in domestic equipment is that accidental malfunctions will result in users being elecrocuted.

The process of electrocution is that a person who is connected to ground by simply standing on a sufficiently conductive floor becomes connected to the "hot" side of the supply. As most people exhibit approximately 5,000 to 10,000 ohms resistance, a current of 23 to 46 milliamperes will flow through the person if the voltage is 115 volts. This is not enough to kill a healthy person, but:

*The resistance is highly variable.

*Most countries use much higher voltages.

*The floor resistance is highly variable.

*A lot of people are not healthy.

The third wire concept is that the outer shell or case of the domestic device should be made of metal, and it is connected to a ground wire so that if an accidental internal short occurs such that the case gets connected to the hot side of the supply, it will rupture the fuse (or trip the circuit breaker) and disconnect the supply.

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