Why can not install a separate circuit breaker at zero

Since Soviet times, the counter on the dashboard were two "plugs" over time people began to fuse, and change to single-pole machines, then declined and this is the cause of such a practice, which is and face it. But, so far I have found single-phase and automatic zero.

What is the danger

The fact is that in this connection, in case of short circuit or overload, the home network may operate a machine that is set to zero, and the machine on stage will remain active. In this case, the phase included in the devices through a network (Rn1) gets broken at the neutral wire.

And if at the same time there was a breakdown of the insulation on the metal housing of the device, it will be under tension, that creates a risk to health and even life.

Devices with a metal housing

Back in his apartment counted four instruments, which could pose a potential danger in this connection.

Output

To avoid this situation, it is necessary to use a two-pole machine, which will shut off once the two wires or one single-pole phase and zero connect directly, without the machine. I think many, it is already known, but experience has shown that no harm will be recalled.

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