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Guidelines for the Grounding System in Buildings
Guidelines for the Grounding System in Buildings
Grounding systems for expanded systems We differentiate between a main grounding system that incorporates the entire plant and the local equipotential bonding for expanded systems: Main system grounding system: Grounding system that incorporates the entire building Local grounding system: Grounding system on the local level (device, machine, cabinet)
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Guidelines for a building grounding system EMC guidelines must be followed for the main grounding system in an expanded system within a building: Each floor must have an earth plane as well as a surrounding grounding strip. This includes the following: welded, steel mats in the concrete bed, hollow floors with copper wire grids etc. The distance between earth conductors must be greater than the following values: Production hall: 3 ... 5 m Areas with computers and sensitive measuring devices: < 2 m All metallic structures within a building should be connected to the network. Metallic framework Concrete reinforcements welded together Metal piping Cable ducts Conveyor belts Metal door frames Grids ...
NOTE: Earth cables may not be longer than 10/(frequency in MHz). Earth cables that are too long cause undefined potentials in the system, unavoidably lead to potential differences between devices and allow undesired currents.
Example: Earth plane in a building The following illustration shows an example of EMC compatible installation of a grounding system in an industrial building