Why did they set the plug to zero before. Abnormal or something

A common story

The neighbor lost his "light", he called me to look. I come, and he still weighs an old metal plate, on which the meter used to hang, it has already been moved, but the protection of two "plugs" remained. It is clear that such new fuses cannot be found, and everything works on "bugs" (thin wire jumpers). The contacts burnt from time to time and went into a cliff, I decided temporarily, until the two-pole machine buys, directly connect zero, especially since according to modern requirements, a separate zero fuse is prohibited.

Two days later, a neighbor bought a box and an automatic machine, which he installed instead of the old devices, it remains to tidy up the wall.

Why is it now forbidden, but before it was

In principle, even now there is a situation where people, instead of traffic jams, put two separate machines. What can this lead to?

In short, then in the event of a short circuit, only the "zero" automatic machine can work, while loss of insulation is possible, and the phase hits the instrument cases

, which creates a danger to life.

Why is there such an inheritance in the form of two fuses?

The thing is that now to our home (primarily) the phase voltage comes (phase-zero), forming 220 V, and before it was linear (phase-phase), therefore, a fuse was installed on each phase. The situation has changed, the lines were switched in the dashboards, and the separate protection in the housing remained, and there were no bipolar machines before.

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