IEC/TR 61000-5-6

Electromagnetic compatibility (EMC) - Part 5-6: Installation and mitigation guidelines - Mitigation of external EM influences

This Technical Report covers guidelines for the mitigation of external electromagnetic influences impinging upon a facility, aimed at ensuring electromagnetic compatibility (EMC) among electrical and electronic apparatus or systems. These influences include lightning, RF transmitters, power-line and telecom transients, high-altitude electromagnetic pulse (HEMP) and other high-power electromagnetic transients. More particularly, this technical report is concerned with the arrangement of shielding and screening against radiated disturbances, and with mitigation of conducted disturbances. These arrangements include appropriate electromagnetic barriers for industrial, commercial, and residential installations.[
]Is intended for use by installers, manufacturers and users of sensitive electrical or electronic installations or systems, and of equipment with emission levels that could degrade the overall electromagnetic (EM) environment. It applies primarily to new installations but, where economically feasible, it may be applied to extensions or modifications to existing facilities.

Electromagnetic compatibility (EMC) - Part 5-6: Installation and mitigation guidelines - Mitigation of external EM influences

General Information

• Status: Not Published
• ICS: 33.100.01 - Electromagnetic compatibility in general
• Technical Committee: SC 77C - High power transient phenomena
• Current Stage: PPUB - Publication issued
• Start Date: 05-Jun-2002
• Ref Project: SIST-TP IEC/TR 61000-5-6:2004 - Electromagnetic compatibility (EMC) - Part 5-6: Installation and mitigation guidelines - Mitigation of external EM influences

Standards Content (Sample)

SLOVENSKI SIST-TP IEC/TR 61000-5-6:2004

STANDARD
april 2004
Electromagnetic compatibility (EMC) - Part 5-6: Installation and mitigation
guidelines - Mitigation of external EM influences
ICS 33.100.01 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

TECHNICAL IEC
REPORT
TR 61000-5-6
First edition
2002-06
PUBLICATION FONDAMENTALE EN CEM
BASIC EMC PUBLICATION
Electromagnetic compatibility (EMC) –
Part 5-6:
Installation and mitigation guidelines –
Mitigation of external EM influences
Compatibilité électromagnétique (CEM) –
Partie 5-6:
Guides d'installation et d'atténuation –
Atténuation des influences électromagnétiques externes
 IEC 2002  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – TR 61000-5-6  IEC:2002(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope and general considerations.6
1.1 Scope.6
1.2 General considerations.6
2 Reference documents.8
3 Terms, definitions and acronyms .10
4 Mitigation of radiated and conducted disturbances .13
4.1 Topological concepts.13
4.2 Mitigation needs .14
4.3 The general concept of enclosure.15
4.4 Interactions at the enclosure boundary.16
5 Shielding .16
5.1 General .16
5.2 Classification of protection zones .18
5.3 Design principles for screening.19
5.4 Implementation of screening.21
6 Filters.26
6.1 General .26
6.2 Fundamental filter characteristics .27
6.3 Functional tasks .29
6.4 Additional filtering concerns .30
6.5 Selection criteria .30
6.6 Filter installation.33
6.7 Filter testing .36
7 Decoupling devices .37
7.1 Isolation transformers.37
7.2 Motor-generator sets .39
7.3 Engine generators .40
7.4 Uninterruptible power supplies (UPS) .40
7.5 Optical links .41
8 Surge-protective devices .41
8.1 General .41
8.2 Direct equipment protection.42
8.3 Installation of multiple SPDs.43
8.4 Side-effects of uncoordinated cascades .44
8.5 Typical protective devices .44
Bibliography.45

TR 61000-5-6  IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 5-6: Installation and mitigation guidelines –
Mitigation of external EM influences
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this technical report may be the subject of
patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
The main task of IEC technical committees is to prepare International Standards. However,
a technical committee may propose the publication of a technical report when it has collected
data of a different kind from that which is normally published as an International Standard, for
example “state of the art”.
Technical reports do not necessarily have to be reviewed until the data they provide are
considered to be no longer valid or useful by the maintenance team.
IEC 61000-5-6, which is a technical report, has been prepared by subcommittee 77C: High
power transient phenomena, of IEC technical committee 77: Electromagnetic compatibility.
It has the status of a basic EMC publication in accordance with IEC Guide 107.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
77C/110/CDV 77C/122/RVC
Full information on the voting for the approval of this technical report can be found in the
report on voting indicated in the above table.
This document, which is purely informative, is not to be regarded as an International
Standard.
– 4 – TR 61000-5-6  IEC:2002(E)
The committee has decided that the contents of this publication will remain unchanged until
2007. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this technical report may be issued at a later date.

TR 61000-5-6  IEC:2002(E) – 5 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts published either as International Standards
or as technical specifications or technical reports, some of which have already been published
as sections. Others will be published with the part number followed by a dash and a second
number identifying the subdivision (example: IEC 61000-6-1).
This part of IEC 61000 gives guidelines for the mitigation of external electromagnetic
influences.
– 6 – TR 61000-5-6  IEC:2002(E)
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 5-6: Installation and mitigation guidelines –
Mitigation of external EM influences
1 Scope and general considerations
1.1 Scope
This part of IEC 61000 covers guidelines for the mitigation of external electromagnetic
influences impinging upon a facility, aimed at ensuring electromagnetic compatibility (EMC)
among electrical and electronic apparatus or systems. These influences include lightning,
RF transmitters, power-line and telecom transients, high-altitude electromagnetic pulse
(HEMP) and other high-power electromagnetic transients. More particularly, this technical
report is concerned with the arrangement of shielding and screening against radiated
disturbances, and with mitigation of conducted disturbances. These arrangements include
appropriate electromagnetic barriers for industrial, commercial, and residential installations.
The concept of barriers installed for mitigating potentially penetrating and unwanted
electromagnetic noise is applicable even when there is no designed-in electromagnetic shield.
The enclosure through which power and signal (communications, control, etc.) cables must
enter or exit may be considered as a potential electromagnetic barrier that will provide some
level of protection. The concept of enclosure can be understood as the perimeter walls of a
building, the walls of a single room, or the housing of an apparatus, with protection installed
at all points of electromagnetic penetration into the enclosure.
This technical report is intended for use by installers, manufacturers and users of sensitive
electrical or electronic installations or systems, and of equipment with emission levels that
could degrade the overall electromagnetic (EM) environment. It applies primarily to new
installations but, where economically feasible, it may be applied to extensions or
modifications to existing facilities. While the technical principles are applicable to individual
equipment or apparatus, such application is not included in the scope of this technical report.
1.2 General considerations
1.2.1 Elementary interference control
In its simplest form, the interference problem consists of a source of disturbance, a victim and
the medium between the two. Interference control consists of suppressing the disturbance
source, strengthening the victim, or impeding the source-victim interaction through the
medium. When the source is not controllable (for example, lightning, portable transmitters,
HEMP, etc.), and the inherent strength of the victim is dictated by other considerations (for
example, circuit density and operating power), interference control is relegated to the
intervening medium. Furthermore, for interference control oriented toward victim protection,
control measures tend to be applied fairly close to the susceptible circuits (at the system or
subsystem levels).
Increasing the separation between them, enclosing one or the other in a shield or ortho-
gonalizing them (for example, rejecting common-mode interference on differential-mode
signalling lines) can reduce the interaction between source and victim. All three techniques
can be combined to form a closed electromagnetic barrier between the source and the victim.
For sources outside the system, the barrier may be applied at the system level. For sources
inside the system, electromagnetic compatibility requires two barriers: one at the source to
control emissions, and one at the victim to control susceptibility. This concept is illustrated in
figure 1. In this technical report, we will concentrate on sources outside the system.

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