Why do we need grounding in the house

Electricity - it is associated with all the modern life of all humanity, and without it we are trite not be able to live comfortably. But in addition to all kinds of goods, electricity, carries a lot of dangers and may even cause irreparable harm to the human body. That is why it was invented many remedies, one of which is called grounding. In this article we'll look at what it is and how to implement it in my house.

In simple terms, grounding - a deliberate electrical connection through a special wire to ground, intended to protect a human from possible electric shock when damage to the main isolation. This special cable (or bus) should have a good contact with the ground.

In most cases the ground is as follows: three rod (you can use the corner), length not less than 1.5 meters are driven vertically into the ground at an equal distance from each other so as to form an isosceles triangle. The upper part of these rods connected to the metal strip, joints carefully boil. In a "top" is welded bolt.

By this bolt then joins flexible copper wire (it is desirable that its cross section is not less than 10 squares), a second end which is put on the switchboard in the building.

Also, you may be paying attention to that on the buildings of the outer wall is a metal rail, which may have the coloring in yellow-green range. This strip also has a rigid connection with hammered pins. This bus is configured to save, in order not to pull away from each appliance to the electrical ground wire, and connect these wires directly to the bus.

What are the requirements to ground in the house

Ground loop must meet the following criteria:

1. Earthed should absolutely all appliances, as well as a bathtub, sink, steel, etc.

2. The total resistance of the grounding loop parameter should not exceed 4 Ohm.

3. We need to use the potential equalization system.

Here are the main three criteria of good ground.

Because of what has current

Let's still will understand the reason why you can "tryahanut" shock. To do this, consider the following situation:

The washing machine has completed its cycle, and you decide to get clean linen. At the same time they touched her body and felt a slight tingling or fairly severe blow.

Or, for example, you bathe, and decided to add a little hot (cold) water. When this took up metal tap and the same felt tingling or shock.

This is very unpleasant situation is solved by connecting the ground to the washing machine, bath and mixer. As well as installing the RCDs in the switchboard.

The operating principle of the ground

Let's first understand, from what "machine bites." It's very simple: in the process of internal wire insulation may be damaged, and the bare part will deal with the case. As long as you do not touch her nothing bad will happen. But as soon as you touch the body creates a chain due to the fact that you're standing on the floor, which still has a connection to the land, and you are currently a "zero wire". And the current, flowing through you into the earth.

Important. For the organism may be harmful, even such a small amount of current as a 50 milliamp. It may cause a malfunction of the heart muscle.

A ground works on the following principle: the grounding loop join absolutely all housing units and metal structures. Also in the electrical installed additional RCD.

And now in the case, if the insulation is damaged appliance, the current will be "dragged" ground and it will flow through it to the ground, and if it value exceeds the danger value, the RCD will disable the network, and you will know that you have a device with faulty insulation, requiring urgent mended.

Dear Reader, my article was useful and interesting?! Then be sure to Put thumbs up, subscribe to my RSS feed ENERGOFIKSIK and share articles to social services. networks. It is very important to feel your support. After all, it will create even more high-quality materials. If you have any questions or suggestions, here is my email: [email protected]