If the light switch connected on the classical scheme, the zero should go directly to the lamp. Wherein the switch interrupts phase. The Russian power grids have zero there is always grounded. Therefore, when the power grid operates in the conventional mode, the potential of a dangerous she is absent.
It has been said that the switch always has to break off during installation phase. When the light is turned off, the voltage in the lamp is lost. Why do it?
Firstly, in the RB has the appropriate item under the number 6.6.28. And there can be read, that should be mounted electric switch in this and only this phase!
What terrible can happen when you install the switch to zero?
Now it should be noted that the circuit in any case would operate regardless of the installation place of the electric switch. But we must remember that incorrect installation threatens the health and even the lives of people who in the future will be to repair the lighting elements to change a light bulb in them.
Many electricians are accustomed to working "in the old way." They suggest that phase switch is broken, as it should be, therefore, they are not afraid to get under high tension. In fact, it can often result in the following: an electrical shut off switch and climb up to get a cartridge that was stuck in the socket. Here is his and waits shock! It is necessary to check if there is power, not relying on the case. We can not exclude the fact that the installer has set all wrong.
If some people still have not understood why the light will be under dangerous voltage is below scheme. It shows how you can install the switch in the neutral conductor.
But the correct diagram:
Should pay attention to the following points:
1. When the switch disconnected phase immediately goes to the lighting element. Then it goes through the bulb to zero. Then comes to the terminal. A zero, that comes to the switch from the junction box is not energized.
2. When properly installed, switch voltage goes on one of the wires. Because he is disabled, it can not go any further. In such a case, the wires connected to the light source, completely safe (provided the OFF switch).
There is one more trouble, which arises due to improper installation. LED lamps and lamp flashing after shutdown. Moreover it is observed in the breakers, which have no lights. To explain this phenomenon can be as follows: the current from the light bulb goes into the ground, passing through the wall.
The problem grows when there is high humidity or inadequate electrical wiring is in good condition.
conclusion
First correct installation mounting boxes, switches and electrical circuits affects human security. In addition, it affects the normal operation of electrical equipment.
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