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IEC 61892-1
Edition 4.0 2019-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Mobile and fixed offshore units – Electrical installations –
Part 1: General requirements and conditions
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IEC 61892-1
Edition 4.0 2019-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Mobile and fixed offshore units – Electrical installations –
Part 1: General requirements and conditions
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.60 ISBN 978-2-8322-6822-3
– 2 – IEC 61892-1:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General requirements and conditions . 14
4.1 General . 14
4.2 Acceptance of substitutes or alternatives . 14
4.3 Additions and alterations . 14
4.4 Environmental conditions . 14
4.4.1 General . 14
Design parameters .
4.4.2 Ambient temperature . 16
Materials .
4.5 Power supply system characteristics . 16
4.5.1 General . 16
4.5.2 AC distribution systems . 17
4.5.3 DC distribution systems . 20
Manual disconnection .
Electrical apparatus for explosive gas atmospheres .
4.6 Clearance and creepage distances . 21
4.7 Insulation . 22
Maintenance and inspection .
Cable entries .
4.8 Precautions against vibration and mechanical shock . 22
4.9 Location of electrical equipment in units. 22
4.10 Mechanical protection . 23
4.11 Protection from against heat, water, steam and oil . 24
4.12 Protection against electrical shock . 24
4.13 Enclosures . 24
4.14 Ignition source control . 24
4.14.1 General . 24
4.14.2 Emergency shutdown (ESD) – General . 25
4.14.3 Emergency conditions due to drilling operations – Mobile drilling units . 26
4.14.4 Manual electrical shutdown . 26
4.15 Degree of protection of equipment by enclosures . 26
4.16 Environmental impact. 29
Annex A (informative) Degree of protection . 30
Annex B (informative) Cold climate precautions . 32
B.1 General . 32
B.2 Emergency power source . 32
B.3 Equipment – General . 32
B.4 Cables and cable installations . 33
B.5 Electrical trace heating systems . 33
B.6 Lighting systems . 33
B.6.1 General . 33
B.6.2 Emergency lights . 33
B.7 Electrical rotating machines . 33
B.8 Explosion protected equipment . 33
Annex C (informative) Specification of surface treatment and protective painting
system . 34
C.1 Objectives . 34
C.2 General and specification. 34
C.2.1 General . 34
C.2.2 Atmospheric corrosivity categories for protective painting systems . 34
C.2.3 Durability performance of a protective painting system . 35
Annex D (informative) DC distribution systems.
D.1 DC distribution systems .
Bibliography . 38
Figure D.1 – Typical configuration of DC distribution system .
Table – Operational design parameters – Ambient temperature .
Table – Design parameters – Relative humidity .
Table 1 – Voltage characteristics . 17
Table 2 – Frequency characteristics . 19
Table 3 – Tolerances for DC system . 20
Table 4 – Fast transients . 21
Table 5 – Minimum requirements for the degree of protection for mobile and fixed
offshore units . 27
Table A.1 – Degrees of protection against foreign objects indicated by the first
characteristic numeral . 30
Table A.2 – Degrees of protection against water indicated by the second characteristic
numeral . 31
Table C.1 – Description of typical atmospheric environments related to the estimation
of corrosivity categories . 35
– 4 – IEC 61892-1:2019 RLV © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MOBILE AND FIXED OFFSHORE UNITS –
ELECTRICAL INSTALLATIONS –
Part 1: General requirements and conditions
FOREWORD
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