FOREWORD
INTRODUCTION
1 Scope
2 Reference documents
3 Definitions
4 General EMC considerations on installation of earthing
and cabling systems
5 Earthing and bonding
6 bonding
7 Cables and wires
8 Additional interference mitigation methods
9 Measuring and testing methods
Figures
1 Demonstration of the fallacy of te "equipotentiality"
concept as a universal rule
2 Schematic plan view of a typical earth electrode
3 Misconception of "dedicated", independent", or "isolated"
earth electrodes
4 The concept of a single earth electrode
5 Recommended configuration for the earth electrodes and
earthing network
6 Loops involving signal cables and earthing network
7 A three-dimensional schematic of the recommended approach
for the earthing network
8 General principles for bonding of various apparatus or
systems to the earthing network
9 Simplified representation of a bonding strap
10 A more realistic representation of an installed bonding
strap
11 Typical bonding straps
12 Relative inductance of flat and round conductors
13 Relative inductance of round, flat and double bonding
straps
14 Example of protected removable connection of a bonding strap
15 Example of optimal bonding of a shielded cable to the
enclosure
16 Schematic of interconnected chassis
17 Differential mode and common mode circuits with bonding
strips and signal cables
18 Effect of the configuration of a parallel-earthing
conductor on the transfer impedance
19 Slits in conduits and cable trays
20 Recommended configuration for cable trays with branches
21 Recommended cable positions parallel to an H-shaped
beam from the EMC point of view
22 Penetration of a shielded cable through an enclosure wall
23 Tray with partition
24 Example of stacking for conduits or trays
25 Topology of circuits containing switches
26 Undesirable connection of a coaxial cable
27 Typical implementations of common-mode ferrite chokes
28 Limitations in the effectiveness of an isolation transformer
29 Parasitic coupling at high frequencies
Annexes
A Examples of earthing systems and cable implementation
B Applying cable theory to enhance EMC
C Benefits of additional conductors parallel to a cable
D Bibliography
Annex figures
A.1 Example of topology for a hybrid earthing system
A.2 EMC cabinet for the protection of sensitive electronics
A.3 Earthing system for a drive with converter and
associated electronics
A.4 Earthing configuration for a power supply system with
associated electronics
A.5 Initial arrangement of the power and control cables
A.6 Improved design with appropriate shield connections
B.1 Unbalanced transport of signals
B.2 Behaviour of Zt as function of frequency for several
coaxial cable configurations
B.3 Unbalanced transmission system connected to earth at one
end
B.4 Balanced transmission system
B.5 Current paths in a coaxial cable
B.6 Differential-mode voltage induced by a magnetic field
in a cable with braided shield
B.7 Currents in the outer conductor of a coaxial cable
B.8 A two-lead cable perturbed by a nearby lead at the voltage
Uext
C.1 Coaxial cables with parallel-earthing conductors
C.2 A coaxial cable with two outer conductors
C.3 Transfer impedances in a shielded balanced pair
C.4 Example of transfer impedance for an aluminium conduit as
a function of frequency
C.5 Mutual inductance and magnetic field for a conduit or
cable tray
C.6 Insulated covers over a conduit