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GB 4943-2001 English PDF (GB4943-2001)

GB 4943-2001 English PDF (GB4943-2001)

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GB 4943-2001: Safety of information technology equipment

This Standard is applicable to mains-powered or battery-powered information technology equipment, including electrical business equipment and associated equipment, with a RATED VOLTAGE not exceeding 600 V. This Standard is also applicable to such information technology equipment: designed for use as telecommunication terminal equipment and TELECOMMUNICATION NETWORK infrastructure equipment, regardless of the source of power; designed to use the AC MAINS SUPPLY as a communication transmission medium. This Standard specifies requirements intended to reduce risks of fire, electric shock or injury for the OPERATOR and layman who may come into contact with the equipment and, where specifically stated, for a SERVICE PERSON. This Standard is intended to reduce such risks with respect to installed equipment, whether it consists of a system of interconnected units or independent units, subject to installing, operating and maintaining the equipment in the manner prescribed by the manufacturer.
GB 4943-2001 (Replaced by GB 4943.1-2011)
GB4943-2001 (Replaced by GB4943.1-2011)
ICS 35.020
L 09
GB
National Standard
of The PEOPLE Republic of China
GB 4943-2001 (Replaced by. GB 4943.1-2011)
Eqv. IEC 60950. 1999
Safety of Information Technology
Equipment
ISSUED ON. NOVEMBER 12, 2001
IMPLEMENTED ON. MAY 1, 2002
Issued by. State Administration of Quality Supervision, Inspection and
Quarantine, PRC
Table of Contents
Preface ... 14
IEC Foreword ... 15
INTRODUCTION ... 16
0 Principles of safety ... 16
0.1 General principles of safety ... 16
0.2 Hazards ... 18
0.2.1 Electric shock ... 18
0.2.2 Energy related hazards ... 20
0.2.3 Fire ... 21
0.2.4 Heat related hazards ... 21
0.2.5 Mechanical hazards ... 22
0.2.6 Radiation ... 22
0.2.7 Chemical hazards ... 23
0.3 Materials and components ... 23
1 General ... 24
1.1 Scope ... 24
1.1.1 Equipment covered by this Standard ... 24
1.1.2 Additional requirements ... 25
1.1.3 Exclusions ... 26
1.2 Definitions ... 26
1.2.1 Equipment electrical ratings ... 26
1.2.2 Operating conditions ... 27
1.2.3 Equipment mobility ... 28
1.2.3.2 HAND-HELD EQUIPMENT ... 28
1.2.4 Classes of equipment ?€? Protection against electric shock ... 29
1.2.5 Connection to the supply ... 30
1.2.6 Enclosures ... 31
1.2.7 Accessibility ... 32
1.2.8 Circuits and circuit characteristics ... 33
1.2.9 Insulation ... 37
1.2.10 CLEARANCE and CREEPAGE DISTANCE ... 38
1.2.11 Components ... 39
1.2.12 Flammability ... 40
1.2.13 Miscellaneous ... 42
1.3 General requirements ... 44
1.3.1 Application of requirements ... 44
1.3.2 Equipment design and construction ... 45
1.3.3 Supply voltage ... 45
1.3.4 Constructions not specifically covered ... 45
1.3.5 Equivalent materials ... 45
1.3.6 Orientation during transport and use ... 46
1.3.7 Choice of criteria ... 46
1.3.8 Examples mentioned in this Standard ... 46
1.3.9 Conductive liquids ... 46
1.4 General conditions for tests ... 46
1.4.1 Application of tests ... 46
1.4.2 Type tests ... 47
1.4.3 Test samples... 47
1.4.4 Operating parameters for tests ... 48
1.4.5 Supply voltage for tests ... 48
1.4.6 Supply frequency for tests ... 49
1.4.7 Electrical measuring instruments... 49
1.4.8 Normal operating voltages ... 49
1.4.9 Measurement of voltage to earth ... 50
1.4.10 Loading configuration of the EUT ... 50
1.4.11 Power from a telecommunication network ... 51
1.4.12 Temperature measurement conditions ... 51
1.4.13 Temperature measurement methods ... 51
1.4.14 Simulated faults and abnormal conditions ... 52
1.5 Components... 53
1.5.1 General ... 53
1.5.2 Evaluation and testing of components ... 53
1.5.3 Thermal controls ... 54
1.5.4 Transformers ... 54
1.5.5 Interconnecting cables ... 54
1.5.6 Capacitor of PRIMARY CIRCUIT ... 54
1.5.7 Components bridging double insulation or reinforced insulation ... 55 1.5.7.1 Bridging Capacitor ...

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