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Multi-Level Building Earthing Guide

This document discusses guidelines for earthing principles and structures in buildings. It recommends a two or three dimensional earthing network configuration using multiple interconnected earth electrodes. For multi-level buildings, each level should have its own earthing mesh network interconnected to the other levels and earth electrodes. This provides redundancy and improves current flow symmetry to reduce impedance and voltage differences between levels. The multiple parallel paths have different resonance frequencies, so if one path has high impedance, others can shunt it, resulting in a low-impedance system overall.

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88 views1 page

Multi-Level Building Earthing Guide

This document discusses guidelines for earthing principles and structures in buildings. It recommends a two or three dimensional earthing network configuration using multiple interconnected earth electrodes. For multi-level buildings, each level should have its own earthing mesh network interconnected to the other levels and earth electrodes. This provides redundancy and improves current flow symmetry to reduce impedance and voltage differences between levels. The multiple parallel paths have different resonance frequencies, so if one path has high impedance, others can shunt it, resulting in a low-impedance system overall.

Uploaded by

mahmoud12122012
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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R - EMC guidelines

2 Earthing principles and


structures

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three dimensional (see Fig. R5). This approach is advised for general use, both
in terms of safety and EMC. This recommendation does not exclude other special
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Equipotential bonding required for


multi-level buildings
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"Electrical" and "communication"


earthing as needed

Multiple interconnected earth electrodes

Fig. R5 : Installation with multiple earth electrodes

In a typical installation for a multi-level building, each level should have its
own earthing network (generally a mesh) and all the networks must be both
interconnected and connected to the earth electrode. At least two connections are
required (built in redundancy) to ensure that, if one conductor breaks, no section of
the earthing network is isolated.
Practically speaking, more than two connections are made to obtain better symmetry
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between the various levels in the building.
The many parallel paths have different resonance frequencies. If one path has a high
impedance, it is most probably shunted by another path with a different resonance
frequency. On the whole, over a wide frequency spectrum (dozens of Hz and MHz),
a large number of paths results in a low-impedance system (see Fig. R6).
Each room in the building should have earthing-network conductors for equipotential
Fig. R6 : Each level has a mesh and the meshes are bonding of devices and systems, cableways, trunking systems and structures. This
interconnected at several points between levels. Certain system can be reinforced by connecting metal pipes, gutters, supports, frames, etc.
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certain areas ground reference plane or earthing strips in areas for electronic systems can be used
to improve earthing of sensitive devices and protection interconnection cables.

R4
Schneider Electric
ll rights reserved

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