What it is and how to perform the potential equalization system

If you've ever felt easy (and not) tingling shock in the bathroom, you certainly We studied this question, and you know that the reason is the potential difference between the metal structures. A way out of this situation, it is considered the implementation of additional potential equalization system. But as they say, if there is more, it must exist and basic. In this article I will talk about these systems.

Why is this system

To begin, let's find out the purpose for which the system is used. As is well known metal objects are excellent conductors of electricity.

Is in our homes these conductors are cast-iron heating pipes, ducts ventilation shafts, towel, water pipes and sewage pipes. And all of these communication systems are interconnected relationship.

In order to understand how the image of the danger potential, let's consider the following situation on these elements:

We all know you, that the voltage is the voltage difference of the phase and neutral conductor (single phase). From the image above, it follows that the current through the phase conductor enters the motor of the washing machine and again goes to the N wire network. And from the same neutral conductor grounding sold the washing machine. It is necessary that the insulating material is damaged appliance was disconnected circuit breaker.

Now imagine the situation that emerged at zero potential of 20-30 volts. This means that if a person touches both the washing machine and dryer,

it will be struck by the washing machine difference of potentials equal to 20-30 and towel warmer potential equal to zero.

Thus, human strike voltage 30 volts. It is to avoid such a situation and realized the potential equalization system, onaya looks like this:

varieties systems

There is a main potential equalization system (OSUP) And additional equipotential system (PRSPs).

Note. PRSPs It can not be realized if there is or is not OK OSUP.

The main potential equalization system must meet the following requirements:

1. Already with the main ground bus is strictly forbidden to combine PE and N Guides

2. Connection scheme to all structures subject to ground, should be strictly radial.

3. The protection circuit is strictly forbidden to install any switching devices

In OSUP combine the following elements:

1. Earthing.

2. GZSH - the main earthing bar, located at the input of the building.

3. All kinds of fittings of a house.

4. Metal ventilation duct.

5. Water pipes of metal.

6. Lightning.

If all of the above elements have a strong bond, the risk of dangerous potential was zero. But becomes commonplace in connection with heating for embracing the replacement of plastic tubes, the circuit becomes torn, and the occurrence of potential.

Also, despite the robust circuit in large high-rise buildings because of the large extent of communication can be potential for precisely this reason to help the main potential equalization system is used additional.

This system is implemented in the bathroom, where it joins the following elements:

- directly to a bath or shower.

- a heated towel rail.

- water pipes and gas pipes.

- sewerage.

- ventilation ducts.

All these elements are connected to separate the copper conductor, which ends meet in PMC (Box of potential equalization).

If you do not have such a system, and you want to implement it in your bathroom, be sure to consider the following important requirement:

1. Additional system is strictly prohibited to sell, if the house is missing or faulty main potential equalization system.

2. Do not use the train connection.

3. We can not allow breaks protective conductor extending from the terminal box to the ground bus located in the flat panel.

Also make sure that the outlet installed in the bathroom, had the additional grounding.

Incidentally, the ground conductor to secure the metal plumbing pipes and heating can be metal clamps. Also note that the minimum conductor cross-section of the grounding wires should be 2.5 square millimeter.

After the installation was carried out additional system, potential equalization, you need to call an expert who produce measurement of earth resistance.

That's all I wanted to tell you about the system of equalization of potentials. Thank you for your attention.