Many of you are probably familiar with the situation, when I come home at night, you go into a dark corridor and turn on the light. Including lighting in the room, you need to go back to the entrance to turn off the lights in the hallway. A small inconvenience, but it can be eliminated.
And if a long corridor? And if you have to get up at night on the second floor, and the switch only on the first floor? The choice is limited: either to go in the dark, or leave the standby light on all night.
There is a third option - install light switches at the beginning and end of your journey. How do you learn from this article.
Straight-through or crossover switch
Neutral switch can only make or break an electrical circuit. But this is not enough for arranging the lighting control of two or more different points.
For these purposes, communicating circuit breakers, which are also called switches. With their help not only break the electrical circuit, but also current consumers are switched from one line to another.
The flow switch design provides two fixed contact and one movable, which commutes your guide with one of the contacts. To understand the principle of operation and the device can switch from Figure 1. Communicating switches always work in pairs.
This scheme perfectly illustrates the principle of operation of the switches. They have a short circuit only when the both contacts are in the same position - connects either the upper (in the scheme) or bottom conductor.
To turn off the light - enough to rewire any of the switches. When the contacts will be in different positions - the connection is broken. Enabling beam also performed by any switch.
Thus, if the bushing switches spread to different parts of the corridor, you can control the lighting, no matter in which part of the room you are in.
The considered scheme operates efficiently, but in terms of saving the wiring, it is not rational, since it is necessary to lay a further two-core cable for connection contacts switch. In the long corridor such extravagance can be substantial. Below I will give you a more cost-effective, simple circuit.
cross-switch
What if your room is in the middle of a long hallway?
It turns out that such a possibility exists. To do this, you must purchase a cross (reverse) switch. Its working principle is clear from the diagram in Figure 2. This device is not one, but two movable contacts which commute between the through line switches. They are connected to each other.
Setting the cross switch to the desired point, for example, at the door of her room, you can control the lighting of this third point. There is a circuit of the lighting with four or more points (Fig. 3).
This scheme is useful for arranging the lighting:
- long corridors, with which there are separate entrances to the rooms;
- for propulsion spans between floors;
- in cots in children's bedrooms, which will allow children to independently turn on / off the light;
- in private homes, for street lighting control amenities, etc.
A simple economical circuit
Please note that the transitional switch connected little unusual (Fig. 4). In the span between them there are no connecting wires. Each switch is powered from a separate junction box. Number of bulbs is not limited.
This connection method is useful in the following cases:
- If the ends of the corridor on cruise spans, and so on. Are boxes (usually the case).
- When the already installed conventional lighting, and you need to convert it to the control of the two points.
When redeveloping you do not need dismantling the wiring between the bulbs. Suffice phase wire from the nearest bulbs extend to a switch transition, and the cable from the last zero bulb connected to another switch (according to the diagram).
The fixed contacts are connected to the phase and neutral, taken from the junction boxes. The sequence does not matter - the main thing that one wire from light bulbs do not connect the terminals of the moving contacts.
If the insulation is marked with color, different switches (the movable contact) connect different colors. In the absence of the color marking is necessary to determine each wire with a tester.