IEC 60092-201:2019

IEC 60092-201 ®
Edition 5.0 2019-09
INTERNATIONAL
STANDARD
Electrical installations in ships –
Part 201: System design – General

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IEC 60092-201 ®
Edition 5.0 2019-09
INTERNATIONAL
STANDARD
Electrical installations in ships –

Part 201: System design – General

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.60 ISBN 978-2-8322-7201-5

– 2 – IEC 60092-201:2019 © IEC 2019
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
3.1 General . 8
3.2 Distribution system . 10
3.3 DC systems of distribution . 11
3.4 AC systems of distribution. 11
3.5 Sources of electrical power . 12
4 Safety aspects . 12
4.1 General . 12
4.2 Degrees of protection . 13
5 System design . 14
5.1 General . 14
5.2 System study and calculations . 15
5.2.1 General . 15
5.2.2 Electrical load study . 15
5.2.3 Short-circuit calculations . 15
5.2.4 Protection and discrimination study . 15
5.2.5 Load flow calculations . 16
5.2.6 Harmonic currents and voltage calculations . 16
5.3 Documentation . 16
5.3.1 General . 16
5.3.2 Apparatus description . 16
5.3.3 Principle single line diagram electrical power system . 17
5.3.4 Overview diagram . 17
5.3.5 List of protection and fault discrimination settings . 17
5.3.6 Circuit diagrams . 17
5.3.7 FAT, HAT and SAT reports . 17
6 Distribution systems . 17
6.1 General . 17
6.2 DC distribution systems . 18
6.2.1 Types of distribution systems . 18
6.2.2 TN-S DC systems . 19
6.2.3 IT DC systems . 20
6.2.4 DC voltages . 20
6.3 AC distribution systems . 21
6.3.1 Primary AC distribution systems . 21
6.3.2 Secondary AC distribution systems . 22
6.3.3 AC voltages and frequencies . 22
6.3.4 Control voltage . 24
7 System earthing . 24
7.1 General . 24
7.2 Neutral earthing methods . 25
7.3 Generators and/or main distribution transformers operated in parallel . 25

7.4 Earthing resistors, connection to hull/structure . 26
8 Sources of electrical power . 27
8.1 Sources of electrical power for auxiliary services . 27
8.1.1 General . 27
8.1.2 Arrangement . 29
8.1.3 Operability . 29
8.1.4 Load shedding and automatic restoration of power . 30
8.2 Bus-tie breakers. 30
8.3 Starting from a dead ship condition . 31
8.4 Consequences of a busbar failure or a control system failure . 31
8.5 Additional source of electrical power . 32
8.6 Emergency source of electrical power . 32
9 Distribution system requirements . 32
9.1 General . 32
9.2 Distribution systems for electrically powered containers or temporary loads . 32
9.3 Methods of distribution . 33
9.4 Balance of loads . 33
9.4.1 Balance of load on three-wire DC systems . 33
9.4.2 Balance of loads in three- or four-wire AC systems . 33
9.5 Final sub-circuits . 33
9.5.1 General . 33
9.5.2 Final sub-circuits for lighting . 33
9.5.3 Final sub-circuits for heating . 34
9.5.4 Control circuits . 34
9.6 Socket-outlets . 35
9.7 Lighting circuits . 35
9.8 Shore connections . 36
9.8.1 Shore connection during docking . 36
9.8.2 Shore connections during port . 36
9.9 Electric and electrohydraulic steering gear . 36
9.9.1 General . 36
9.9.2 Motors . 37
9.9.3 Circuit design . 37
9.9.4 Controls and indications . 38
9.9.5 Separation . 39
9.9.6 Communication . 39
9.10 Navigation lights . 39
9.11 Navigation installations . 39
9.12 Radio installations . 39
9.13 Permanently installed bilge-pumps . 40
9.14 Motor circuits . 40
9.14.1 Starting of motors . 40
9.14.2 Means of disconnection . 40
9.14.3 Motor starters . 40
9.15 Luminaries . 41
9.15.1 Discharge lamp luminaries of voltages above 250 V . 41
9.15.2 Searchlights and arc lamps . 41
9.16 Internal communication circuits . 41
9.16.1 Voice communication . 41

– 4 – IEC 60092-201:2019 © IEC 2019
9.16.2 General emergency alarm system .
...