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GB 4943.1-2011 (GB4943.1-2011)

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GB 4943.1-2011: PDF in English
GB 4943.1-2011
GB
ICS 35.020
L 09
National Standard
of the People’s Republic of China
Replacing GB 4943-2001
Information technology equipment -
Safety - Part1. General requirements
(IEC 60950-1.2005, MOD)
ISSUED ON. DECEMBER 30, 2011
IMPLEMENTED ON. DECEMBER 1, 2012
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee
Table of Contents
Foreword ... 5
Introduction ... 12
0 Principles of safety ... 12
0.1 General principles of safety ... 12
0.2 Hazards... 13
0.3 Materials and components ... 17
1 General ... 18
1.1 Scope ... 18
1.2 Definitions ... 20
1.3 General requirements ... 36
1.4 General conditions for tests ... 38
1.5 Components ... 42
1.6 Power interface ... 49
1.7 Markings and instructions ... 50
2 Protection from hazards ... 58
2.1 Protection from electric shock and energy hazards ... 58
2.2 SELV circuits ... 68
2.3 TNV circuits ... 69
2.4 Limited current circuits ... 74
2.5 Limited power sources ... 76
2.6 Provisions for earthing and bonding ... 77
2.7 Overcurrent and earth fault protection in primary circuits ... 85
2.8 Safety interlocks ... 88
2.9 Electrical insulation ... 91
2.10 Clearances, creepage distances and distances through insulation ... 96
3 Wiring, connections and supply ... 122
3.1 General ... 122
3.2 Connection to a mains supply ... 126
3.3 Wiring terminals for connection of external conductors ... 132
3.4 Disconnection from the mains supply ... 135
3.5 Interconnection of equipment ... 138
4 Physical requirements ... 139
4.1 Stability ... 139
4.2 Mechanical strength ... 140
4.3 Design and construction ... 144
4.4 Protection against hazardous moving parts ... 153
4.5 Thermal requirements ... 154
4.6 Openings in enclosures ... 157
4.7 Resistance to fire ... 164
5 Electrical requirements and simulated abnormal conditions ... 171
5.1 Touch current and protective conductor current ... 171
5.2 Electric strength ... 179
5.3 Abnormal operating and fault conditions ... 183
6 Connection to telecommunication networks ... 187
6.1 Protection of telecommunication network service persons, and users of other equipment
connected to the network, from hazards in the equipment ... 187
6.2 Protection of equipment users from overvoltages on telecommunication networks ... 190
6.3 Protection of the telecommunication wiring system from overheating ... 192
7 Connection to cable distribution systems ... 193
7.1 General ... 193
7.2 Protection of cable distribution system service persons, and users of other equipment
connected to the system, from hazardous voltages in the equipment ... 194
7.3 Protection of equipment users from overvoltages on the cable distribution system ... 194
7.4 Insulation between primary circuits and cable distribution systems ... 195
Annex A ... 197
Annex B ... 200
Annex C ... 206
Annex D ... 210
Annex E ... 212
Annex F ... 213
Annex G ... 221
Annex H ... 229
Annex J ... 230
Annex K ... 231
Annex L ... 233
Annex M ... 235
Annex N ... 240
Annex P ... 242
Annex Q ... 248
Annex R ... 249
Annex S ... 252
Annex T ... 254
Annex U ... 256
Annex V... 260
Annex W ...
......