Repair and design

Potential equalization system

A potential equalization system is necessary in order to fulfill the electrical safety of your home. Many people have probably heard about this, but not everyone knows what it is. In this article, you will learn how to install a potential equalization system.

Potential equalization system

The potential equalization system must not be installed in homes that have a TN-C grounding system. The potential equalization system (CES) can have two types, which include:

  1. Basic Equalization of Potentials (OSUP).
  2. Additional potential equalization system (DCES).

The control system is designed to perform potential equalization for all conductive parts of the building:

  • Elements of the building.
  • The construction of buildings.
  • Network engineering.
  • Lightning protection systems.

All connections must be made using PE protective conductors. These conductors will be able to form a "grid" in the building. This grid should connect all components with grounding devices. In the event voltage gets to the conductive parts of the building, a short circuit current will occur, which will subsequently lead to the shutdown of the damaged area. To secure your home, you can also implement the TT grounding system.

Basic Equalization of Potentials (OSUP)

This potential equalization system consists of the following elements:

  • Ground loop
  • The main grounding bus.
  • Nets of protective conductors.
  • Equalization potential conductors.

The main ground bus must be installed in the inlet switchgear of the building. You will need to connect a steel strip to the main ground bus, which will go from the ground loop.

You will also need to connect to the main ground bus:

  1. PEN lead-in conductor.
  2. PE conductor.

Then, PE conductors of group wiring lines will leave the main ground bus. Also, PE equalization potentials of the conductive parts of the building should move away from it.

It is important to know!!! (OSUP)

  • Do not connect PE conductor and N conductor.

The connection of these conductors is prohibited starting from the main protective bus.

  • Connection diagram for grounding structures.

The connection diagram to grounding structures must be radial. The radial scheme will be performed as follows: the grounding part of the building must have its own potential equalization conductor.

It is important to know! It is forbidden to connect potential equalization conductors with a loop cable.

  • Switching protection devices.

Remember that it is forbidden to install switching devices in protective circuits.

Additional potential equalization system

DCS is necessary in order to provide additional protection in rooms with increased danger. An additional potential equalization system consists of the following elements:

  1. Equalization boxes.
  2. Equalization potential conductors.

In order to carry out the installation of the DCS, you need to determine the place of installation of the potential equalization box.

Now you will need to connect the PE bus of the input electrical panel and the PE bus, which is located in the PMC. This can be done using a copper wire, which has a cross section of 6 mm. If you are interested, then read what IP protection is.

The third step is that you will need to ground all the metal structures in the bathroom:

  1. Heating.
  2. Water pipes.
  3. Hot water supply.
  4. Bathroom.

Protective conductors from earthed structures must also be connected to the PE bus. Fastening to pipes can be done with metal clamps. All sockets in the bathroom will be subject to additional grounding. Protective conductors must have a cable cross-section from 2.5 to 6 mm.

After the installation of the potential equalization system, you must definitely invite specialists who will conduct the following measurements:

  1. Earth resistance measurement.
  2. Checking for continuity between grounding structures.

As you can see, installing the potential equalization system yourself is quite simple.

Read: why the electric shock in the bathroom.