What is the purpose of ground wire
Main equipotential bonding
To DIN VDE 0100-410 Construction of low-voltage systems: Protective measures - protection against electric shock A main equipotential bonding must be carried out in every building. With the help of equipotential bonding conductors (at least 6 mm² Cu) and an equipotential bonding rail, which is expediently arranged in the house connection room, electrically conductive connections must be established between the following parts of the system:
- Main protective conductor (from house connection box)
- Main earthing conductor (connection to the foundation earth)
- Main water pipe (behind the water meter in the house)
- Main gas pipe (behind the main shut-off device)
- other metal pipe systems (heating pipes, sewage pipes, guide rails for elevators, etc.)
- Telecommunication system.
Additional local equipotential bonding
An additional equipotential bonding is required after DIN VDE 0100Erection of low-voltage systems required for
- Rooms with particular electrical hazard due to the ambient conditions, e.g. in bathrooms, showers, swimming facilities, etc.
- in IT systems with insulation monitoring, and
- if the specified conditions for the automatic shutdown of the power supply for protection against indirect contact cannot be met.
The systems must be connected to one another with equipotential bonding conductors (at least 4 mm² Cu).
Expertise on the subject
Construction and laying of the foundation earth electrode
A foundation earth consists of non-insulated conductors, usually made of strip or round steel, which are inserted into the foundations of the outer walls or ...
House connection box
House connection boxes (HAK) must be attached in easily accessible places so that in the event of damage, e.g. the fire brigade ...
House connection room, wall, niche
In order to be able to install and maintain all connection devices of a building clearly and properly, the ...
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