IEC TR 62482:2008

Electrical installations in ships - Electromagnetic compatibility - Optimising of cable installations on ships - Testing method of routing distance

This Technical Report defines a test method to determine minimum routing distances in order to avoid crosstalk of fast transients (bursts). The test results may be applied to cable installations according to IEC 60092-352.

General Information

• Status: Published
• Publication Date: 21-Feb-2008
• ICS: 17.220.01 - Electricity. Magnetism. General aspects
• ICS: 47.020.60 - Electrical equipment of ships and of marine structures
• Technical Committee: TC 18 - Electrical installations of ships and of mobile and fixed offshore units
• Current Stage: PPUB - Publication issued
• Start Date: 22-Feb-2008
• Completion Date: 31-May-2008

Overview

IEC TR 62482:2008 - "Electrical installations in ships - Electromagnetic compatibility - Optimising of cable installations on ships - Testing method of routing distance" - is a Technical Report from the IEC that defines a laboratory test method to determine minimum routing distances between different cable categories on ships to avoid crosstalk from fast transients (bursts). Test results are intended for application to shipboard cable installations in accordance with IEC 60092-352 and support EMC planning for marine electrical systems.

Key topics and technical requirements

• Scope: Quantifies sufficient separation (routing distance and routing height) to avoid transient-induced crosstalk into susceptible cables used for control and instrumentation.
• Test principle: Inject fast transient pulses (burst) into an interfering cable and monitor a susceptible cable using a signal detector (SD) that simulates industrial digital equipment (e.g., PLCs).
• Burst source: Bursts generated in accordance with IEC 61000-4-4.
• Cable types:
  • Susceptible (drain) cable - Type 1: two‑wire unshielded; Type 2: four‑wire shielded.
  • Interfering (source) cable - unshielded cable of same length as susceptible cable.
• Reference ground: Simulate ship metallic structure with a metallic ground plane; minimum recommended area 10 m × 10 m for reproducible measurements.
• Test setup and results: Defines how to establish interference thresholds (positive/negative), parallel routing arrangements, routing height above reference ground, and procedures to report minimum safe separation for specific cable categories and installation configurations.

Practical applications

• Optimising cable routing on newbuild ships, retrofits and offshore units to meet EMC requirements.
• Preventing malfunction of sensitive control, automation and communication equipment caused by fast transient crosstalk.
• Supporting ship electrical designers, shipyards and system integrators in choosing routing distances where standards like IEC 60092-352 give general guidance but need substantiation for transient immunity.
• Providing test evidence for classification societies and safety assessments where EMC between power electronics and instrumentation is critical.

Who should use this TR

• Marine electrical and EMC engineers
• Ship designers and naval architects responsible for cable routes
• Shipyards and system integrators performing EMC acceptance testing
• Classification societies and regulatory bodies assessing SOLAS/IMO EMC compliance

Related standards

Normative and related references cited include:

• IEC 60092 series (notably IEC 60092-352)
• IEC 60533 (shipboard EMC)
• IEC 61000-4-4 (fast transient/burst immunity test)
• IEC 61196-1 (coaxial cable transfer impedance)
• Relevant IEC shipboard cable parts (353, 374, 375, 376) and IEC 60092-504

Keywords: IEC TR 62482:2008, routing distance, ship cable routing, electromagnetic compatibility, EMC testing, burst immunity, IEC 60092-352.

Standards Content (Sample)

IEC/TR 62482
Edition 1.0 2008-02
TECHNICAL
REPORT
Electrical installations in ships – Electromagnetic compatibility – Optimising of
cable installations on ships – Testing method of routing distance

IEC/TR 62482:2008(E)
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IEC/TR 62482
Edition 1.0 2008-02
TECHNICAL
REPORT
Electrical installations in ships – Electromagnetic compatibility – Optimising of
cable installations on ships – Testing method of routing distance

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
P
ICS 17.220.01; 47.020.60 ISBN 2-8318-9619-3

– 2 – TR 62482 © IEC:2008(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5

1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Principle .7
4.1 General .7
4.2 Reference ground.8
4.3 Signal detector (SD) .8
4.4 Susceptible (drain) cable.8
4.5 Interfering (source) cable .8
4.6 Burst generator .8
5 Test set-up .8
5.1 Susceptible interference threshold .8
5.2 Cable routing and distances .8
6 Test.9
6.1 General .9
6.2 Test performance .10
6.3 Test result .10

Annex A (informative) Test Report: Performance of a routing optimising test .11

Bibliography.16

Figure 1 – Routing distance and routing height .9
Figure 2 – Test set-up 1: Unshielded susceptible cable.9
Figure 3 – Test set-up 2: Shielded susceptible cable .10
Figure A.1 – Test site with reference ground.12
Figure A.2 – Burst injection into interfering cable .14
Figure A.3 – Signal detector (SD) .14
Figure A.4 – Signal detector (SD), block diagram.15

Table 1 – Cable categories .7
Table A.1 – Examples for test facilities .11
Table A.2 – Measured interference threshold values versus separation, height and type
of susceptible cable .13

TR 62482 © IEC:2008(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL INSTALLATIONS IN SHIPS –
ELECTROMAGNETIC COMPATIBILITY –
OPTIMISING OF CABLE INSTALLATIONS ON SHIPS –
TESTING METHOD OF ROUTING DISTANCE

FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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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".
IEC 62482/TR, which is a technical report, has been prepared by IEC technical committee 18:
Electrical installations of ships and of mobile and fixed offshore units.
The text of this technical report is based on the following documents:
Enquiry draft Report on voting
18/1030/DTR 18/1041A/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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 4 – TR 62482 © IEC:2008(E)
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

TR 62482 © IEC:2008(E) – 5 –
INTRODUCTION
In accordance with IMO-Resolution A.694/6.1: “All reasonable and practicable steps shall be
taken to ensure electromagnetic compatibility between the equipment concerned and other
radio communication and navigational equipment carried on board in compliance with the
relevant requirements of chapters III, IV and V of the SOLAS Convention.”
To fulfil this requirement it is necessary to survey the chosen cables and cable installation
with regard to EMC.
Basic rules for cabling in international shipbuilding are presently specified in the series of
standards given in IEC 60092 [1] , requirements on dimensions of routing distances in cable
systems are given in IEC 60533 and basic requirements on cable routing in IEC 60092-352.
As the requirements differ between the relevant documents, the question of validity has been
discussed internationally. This applies particularly in regard to parallel routing of power
electronics cables on the one hand and measuring and control equipment cables on the other
hand.
General Information about routing distances is mainly based on the German standard
VG 95375-3 [4]. This standard is based on tests performed in 1982 [2].
In those days tests were performed mainly with sinusoidal signals in the frequency range of
0.1 MHz up to > 40 MHz and even today there is no reason to doubt these test results.
However, the question has often been raised whether these results are also adequate for
unacceptable crosstalk into cables for integrated digital circuits. In no case fast transients
may affect the function inadmissibly where interference thresholds should be a maximum. The
measurements were accomplished to investigate this issue.
—————————
Numbers in square brackets refer to the Bibliography.

– 6 – TR 62482 © IEC:2008(E)
ELECTRICAL INSTALLATIONS IN SHIPS –
ELECTROMAGNETIC COMPATIBILITY –
OPTIMISING OF CABLE INSTALLATIONS ON SHIPS –
TESTING METHOD OF ROUTING DISTANCE

1 Scope
This Technical Report describes tests methods carried out to determine minimum routing
distances in order to avoid crosstalk of fast transients (bursts). The test results may be
applied to cable installations according to IEC 60092-352.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, o
...