GB 4943.1-2022_English: PDF (GB4943.1-2022)
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Audio/video, information and communication technology equipment - Part 1: Safety requirements
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[Replaced by GB 4943.1-2022] Information technology equipment -- Safety -- Part 1: General requirements
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Safety of information technology equipment
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Safety of information technology equipment including electrical business equipment
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Safety of information technology equipment including electrical business equipment
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| Standard ID | GB 4943.1-2022 (GB4943.1-2022) | | Description (Translated English) | Audio/video, information and communication technology equipment - Part 1: Safety requirements | | Sector / Industry | National Standard | | Classification of Chinese Standard | L09 | | Classification of International Standard | 35.020 | | Word Count Estimation | 346,376 | | Date of Issue | 2022-07-19 | | Date of Implementation | 2023-08-01 | | Older Standard (superseded by this standard) | GB 8898-2011; GB 4943.1-2011 | | Administrative Organization | Ministry of Industry and Information Technology of the People's Republic of China | | Proposing organization | Ministry of Industry and Information Technology of the People's Republic of China | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB 4943.1-2011 (GB4943.1-2011) | | Description (Translated English) | Information technology equipment - Safety - Part 1: General requirements | | Sector / Industry | National Standard | | Classification of Chinese Standard | L09 | | Classification of International Standard | 35.020 | | Word Count Estimation | 236,284 | | Date of Issue | 2011-12-30 | | Date of Implementation | 2012-12-01 | | Older Standard (superseded by this standard) | GB 4943-2001 | | Adopted Standard | IEC 60950-1-2005, MOD | | Drafting Organization | Ministry of Industry and Information Technology Research Institute of Electronics Fourth | | Administrative Organization | Ministry of Industry and Information Technology Research Institute of Electronics Fourth | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 23 of 2011 | | Proposing organization | Ministry of Industry and Information Technology of the People's Republic of China | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This Chinese standard applies to grid -powered or battery -powered, rated voltage not exceeding 600V of information technology equipment, including electrical business equipment and associated equipment. This standard also applies to the following information technology equipment: designed as a communication terminal device and the communication network infrastructure, regardless of the way power supply, designed and intended to be connected directly or as a base apparatus in the cable distribution system, device, without regard to power supply means, design using AC mains power supply as an information transmission medium. This standard also applies to information technology equipment intended to be installed on the internal components and assemblies. If you install these components and components complete IT equipment complies with the requirements of this standard, then do not require these components or components comply with all the requirements of this standard. | | Standard ID | GB 4943-2001 (GB4943-2001) | | Description (Translated English) | Safety of information technology equipment | | Sector / Industry | National Standard | | Classification of Chinese Standard | L09 | | Classification of International Standard | 35.020 | | Word Count Estimation | 166,143 | | Date of Issue | 2001-11-12 | | Date of Implementation | 2002-05-01 | | Older Standard (superseded by this standard) | GB 4943-1995 | | Adopted Standard | IEC 60950-1999, MOD | | Drafting Organization | China Electronics Standardization Institute | | Administrative Organization | China Electronics Standardization Institute | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 23 of 2011 | | Proposing organization | Ministry of Information Industry of the People Republic of China | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China | | Summary | This Chinese standard applies to power supply or battery-powered, rated voltage not exceeding 600V of information technology equipment, including electrical business equipment and associated equipment. This standard is also applicable to the design and reserve directly connected to the communication network information technology equipment, regardless of the way power. |
GB 4943.1-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 35.020
CCS L 09
Replacing GB 4943.1-2011, GB 8898-2011
Audio/video, information and communication technology
equipment - Part 1: Safety requirements
(IEC 62368-1:2018, MOD)
ISSUED ON: JULY 19, 2022
IMPLEMENTED ON: AUGUST 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 17
Introduction ... 24
0.1 Objective ... 24
0.2 Persons ... 24
0.2.1 General ... 24
0.2.2 Ordinary person ... 24
0.2.3 Instructed person ... 24
0.2.4 Skilled person ... 25
0.3 Model for pain and injury ... 25
0.4 Energy sources ... 26
0.5 Safeguards ... 27
0.5.1 General ... 27
0.5.2 Equipment safeguard ... 28
0.5.3 Installation safeguard ... 28
0.5.4 Personal safeguard ... 29
0.5.5 Behavioural safeguards ... 29
0.5.6 Safeguards during ordinary or instructed person service conditions ... 30
0.5.7 Equipment safeguards during skilled person service conditions ... 30
0.5.8 Examples of safeguard characteristics ... 31
0.6 Electrically-caused pain or injury (electric shock) ... 31
0.6.1 Models for electrically-caused pain or injury ... 31
0.6.2 Models for protection against electrically-caused pain or injury ... 32
0.7 Electrically-caused fire ... 33
0.7.1 Models for electrically-caused fire ... 33
0.7.2 Models for protection against electrically-caused fire ... 34
0.8 Injury caused by hazardous substances ... 35
0.9 Mechanically-caused injury ... 36
0.10 Thermally-caused injury (skin burn) ... 37
0.10.1 Models for thermally-caused injury ... 37
0.10.2 Models for protection against thermally-caused pain or injury ... 38
0.11 Radiation-caused injury ... 39
0.12 Description of relevant information ... 40
1 Scope ... 41
2 Normative references ... 43
3 Terms, definitions and abbreviated terms ... 54
3.1 Energy source abbreviations ... 54
3.2 Other abbreviations ... 55
3.3 Terms and definitions ... 56
3.3.1 Circuit terms ... 60
3.3.2 Enclosure terms ... 60
3.3.3 Equipment terms ... 61
3.3.4 Flammability terms ... 64
3.3.5 Electrical insulation ... 66
3.3.6 Miscellaneous ... 67
3.3.7 Operating and fault conditions ... 70
3.3.8 Persons ... 72
3.3.9 Potential ignition sources ... 72
3.3.10 Ratings ... 73
3.3.11 Safeguards ... 74
3.3.12 Spacings ... 77
3.3.13 Temperature controls ... 77
3.3.14 Voltages and currents ... 78
3.3.15 Classes of equipment with respect to protection from electric shock ... 79
3.3.16 Chemical terms ... 80
3.3.17 Batteries ... 81
3.3.18 FIW terms ... 82
3.3.19 Sound exposure ... 83
4 General requirements ... 84
4.1 General ... 84
4.1.1 Application of requirements and acceptance of materials, components and
subassemblies ... 84
4.1.2 Use of components ... 84
4.1.3 Equipment design and construction ... 85
4.1.4 Equipment installation ... 85
4.1.5 Constructions and components not specifically covered ... 86
4.1.6 Orientation during transport and use ... 86
4.1.7 Choice of criteria ... 86
4.1.8 Liquids and liquid filled components (LFC) ... 86
4.1.9 Electrical measuring instruments ... 87
4.1.10 Temperature measurements ... 87
4.1.11 Steady state conditions ... 87
4.1.12 Hierarchy of safeguards ... 87
4.1.13 Examples mentioned in this document ... 88
4.1.14 Tests on parts or samples separate from the end-product ... 88
4.1.15 Markings and instructions ... 88
4.2 Energy source classifications ... 88
4.2.1 Class 1 energy source ... 88
4.2.2 Class 2 energy source ... 89
4.2.3 Class 3 energy source ... 89
4.2.4 Energy source classification by declaration ... 89
4.3 Protection against energy sources ... 89
4.3.1 General ... 89
4.3.2 Safeguards for protection of an ordinary person ... 89
4.3.3 Safeguards for protection of an instructed person ... 91
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1: Rules for the structure and drafting of standardizing
documents".
This document is Part 1 of GB 4943. GB 4943 has issued the following part:
- Part 1: Safety requirements.
This document replaces GB 4943.1-2011 "Information technology equipment - Safety
- Part 1: General requirements" and GB 8898-2011 "Audio, video and similar electronic
apparatus - Safety requirements". Compared with GB 4943.1-2011 and GB 8898-2011,
in addition to structural adjustment and editorial changes, the main technical changes
are as follows:
- Add energy source classification tests; specify different limits and safeguard
requirements (see 5.2, 6.2, 8.2, 9.2, 10.2);
- Delete the definition of TNV circuit (see 1.2.8.11 of GB 4943.1-2011 and Annex
B of GB 8898-2011);
- Add the definition and requirements of insulating liquid (see 3.3.5.4, 4.4.4, 5.4.12,
6.4.9);
- Add and change the requirements for equipment containing liquid (see 4.1.8, B.3.1,
F.4, G.15, and P.3; 4.3.10, 4.3.11, and 4.3.12 of GB 4943.1-2011);
- Add requirements for equipment containing coin / button cell batteries (see 4.8);
- Change the test requirements or limits of some safety requirements (see Table 4,
5.4.2, 5.4.9, 5.5.2.2, and Table 38, etc.; 5.1, 2.10.3, 5.2, 2.1.1.7, and Table 4C, etc.
of GB 4943.1-2011; 9.1.1.1, 13.3, 10.3, 9.1.6, and Table 3, etc. of GB 8898-2011);
- Add requirements for backfeed (see 5.8);
- Add test requirements for power source circuits (see 6.2);
- Change the requirements and test methods for combustible materials (see 6.4 and
Annex S; 4.7 and Annex A of GB 4943.1-2011; Clause 20 and Annex G of GB
8898-2011);
- Change the requirements for enclosure openings (see 6.4.8.3 and P.2; 4.6 of GB
4943.1-2011; 9.1.3 of GB 8898-2011);
- Add requirements for large equipment (see 8.5.4);
- Change the test method for equipment mounted to a wall or ceiling (see 8.7; 4.2.10
of GB 4943.1-2011; 19.6 of GB 8898-2011);
- Add requirements for slide-rail mounted equipment (see 8.11);
- Add requirements for wireless transmitters (see 9.6);
- Change the requirements for optical radiation (see Table 39, 10.3, and 10.4;
4.3.13.5 of GB 4943.1-2011; 6.2 of GB 8898-2011);
- Add requirements for acoustic radiation (see 10.6);
- Add requirements for the input signal of the display (see B.2.5);
- Add new identification symbols for Class II equipment with a functional earthing
connection (see F.3.6.2);
- Add requirements for transformers using fully insulated winding wire (see G.5.3.4);
- Add requirements for liquid filled components (see G.15);
- Add requirements for integrated circuits and integrated circuits with X-capacitor
function (see G.16);
- Add and change the requirements for equipment containing batteries and their
protection circuits (see Annex M);
- Add the limited short-circuit test (see Annex R);
- Delete the spring impact hammer test (see 12.1.3 of GB 8898-2011);
- Add the children test probe and wedge probe (see Annex V);
- Add requirements for outdoor equipment (see Annex Y).
This document modifies and adopts IEC 62368-1:2018 "Audio/video, information and
communication technology equipment - Part 1: Safety requirements".
Compared with IEC 62368-1:2018, this document has technical differences, which are
marked with a vertical single line (|) in the outer margin of the clauses involved. These
technical differences and their reasons are as follows:
a) Scope of application
IEC 62368-1:2018 applies to equipment intended to be used at an altitude of 2000
m and below. Due to the particularity of China's geographical conditions and the
distribution characteristics of ethnic minority populations, after the revision of
some clauses of IEC 62368-1:2018, this document is applicable to equipment
Audio/video, information and communication technology
equipment - Part 1: Safety requirements
1 Scope
This document specifies the safety requirements of electrical and electronic equipment
within the field of audio, video, information and communication technology, and
business and office machines. It does not include requirements for performance or
functional characteristics of equipment.
This document is applicable to the above electrical and electronic equipment with a
rated voltage not exceeding 600 V.
Note 1: Examples of equipment within the scope of this document are given in Annex A.
Note 2: A rated voltage of 600 V is considered to include equipment rated 400/690 V.
This document is also applicable to:
- components and subassemblies intended for incorporation in this equipment. Such
components and subassemblies need not comply with every requirement of this
document, provided that the complete equipment, incorporating such components
and subassemblies, does comply;
- external power supply units intended to supply other equipment within the scope
of this document;
- accessories intended to be used with equipment within the scope of this document;
- large equipment installed in restricted access areas. For equipment having large
machinery aspects, additional requirements may apply; and
- equipment to be used in tropical regions.
This document also includes requirements for audio/video, information and
communication technology equipment intended to be installed in an outdoor location.
The requirements for outdoor equipment also apply, where relevant, to outdoor
enclosures suitable for direct installation in the field and supplied for housing
audio/video, information and communication technology equipment to be installed in
an outdoor location. See Annex Y for specific construction requirements.
Each installation may have particular requirements. In addition, requirements for
protection of the outdoor equipment against the effects of direct lightning strikes are
not covered by this document.
Note 3: For information on this subject, see GB/T 21714.1.
This document assumes a maximum altitude of 5000 m unless otherwise specified by
the manufacturer.
Additional requirements for equipment having the capability to supply DC power over
commonly used communication cables, such as USB or Ethernet (PoE), are given in
IEC 62368-3. IEC 62368-3 does not apply to:
- equipment supplying power using proprietary connectors; or
- equipment using a proprietary protocol for power selection.
This document specifies safeguards for ordinary persons, instructed persons, and skilled
persons. Additional requirements may apply for equipment that is clearly designed or
intended for use by children or specifically attractive to children.
Note 4: In Australia, the work conducted by an instructed person or a skilled person may require
formal licensing from regulatory authorities.
Note 5: In Germany, in many cases a person may only be regarded as an instructed person or a
skilled person if certain legal requirements are fulfilled.
This document does not apply to:
- equipment with non-self-contained hazardous moving parts, such as robotic
equipment; and
Note 6: For requirements related to robotic equipment in an industrial environment, see GB/T
5226.1, GB 5226.3, GB 11291.1 and GB 11291.2.
- personal care robots, including mobile servant robots, physical assistant robots, and
person carrier robots; and
Note 7: For requirements related to personal care robots, see GB/T 36530.
- power supply systems that are not an integral part of the equipment, such as motor-
generator sets, battery backup systems and distribution transformers.
This document does not address:
- manufacturing processes except for routine tests;
- injurious effects of gases released by thermal decomposition or combustion;
- disposal processes;
- effects of transport (other than as specified in this document);
......
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
Foreword
All technical content in this Part of GB 4943 is mandatory.
GB 4943 Safety of Information Technology Equipment is currently divided into 4
parts:
— Part 1: general requirements;
— Part 21: remote feeding;
— Part 22: equipment installed outdoors;
— Part 23: large data storage equipment.
This part is Part1 of GB 4943.
This part was drafted according to the given rules of GB/T 1.1-2009.
This part uses redrafting rules to modify and adopt the second edition (English
edition) of international standard IEC 609501:2005 Safety of Information Technology
Equipment Part 1: General Requirements.
The technical differences between this part and IEC 60950-1:2005 are:
[Translator: The major differences between GB 4943.1-2011 and IEC 60950-1:2005
are highlighted in BLUE color].
a) Power tolerance
Provision 1.4.5 in IEC 60950-1:2005 specifies that the tolerance of rated voltage
is +6% and -10%. According to the real situation of Chinese power supply
voltage, GB 4943.1-2001 specifies the tolerance to be +10% and -10%.
DELETE the content of the first dash.
b) Marking of power rated value
Provision 1.7.1 in IEC 60950-1:2005 does not clearly specify a specific values
for rated voltage and frequency. It only expresses in example. And the voltage in
the example does not include the Chinese power supply voltage. According to
the requirements of Chinese mains power supply voltage, the supply voltage is
220V, 50Hz or the 3-phase 380V, 50Hz. So this Part clearly specifies the rated
value of the mains. For the range of rated voltage, it shall include 220V or
3-phase 380V. For multiple rated voltages, one of them must be 220V or
3-phase 380V. And it must be set as 220V or 3-phase 380V when leaving factory.
For multiple ranges of rated voltage, they must include 220V or 3-phase 380V.
And the range must be set as 220V or 3-phase 380V when leaving factory.
Rated frequency or range of rated frequency shall be 50Hz or include 50Hz.
c) Safety instructions
It clearly specifies the safety instructions in words. ADD a paragraph to 1.7: If
there is no other provision, all the required marks and the words in the
instructions shall use normative Chinese.
In 1.7.2.1, ADD the safety warning requirements and warning marks of using
conditions related to altitude and tropical climate.
For equipment which only apply to the area at altitude below 2 000 meter, they
shall be marked with “only apply to the area at altitude below 2 000 meter”, or
similar warning sentences, or identification symbols at obvious position.
For equipment which only apply to the condition of non-tropical climate, they
shall be marked with “only apply to the condition of non-tropical climate”, or
similar warning sentences, or identification symbols at obvious position.
If using the mark alone, it shall provide the content explanation of the mark in the
instructions.
Safety warning sentences (for example, warning sentences of USE under the
conditions of altitude below 2000 meter and USE in non-tropical climate) shall
use the acceptable language at where the equipment is prescribed for
marketing.
ADD normative annex DD. PROVIDE the instructions of new safety warning
mark. ADD informative annex EE. PROVIDE the comparison table in Chinese,
Tibetan, Mongolian, Zhuang and Uyghur which are related to safety in this Part.
d) Power plugs
According to Chinese dedicated standard of power plugs, ADD “The plug
connecting the equipment with AC mains supply shall comply with the
requirements of GB 1002 or GB 1003 or GB/T 11918”.
e) Scope
IEC 60959-1:2005 applies to the equipment which is prescribed to use under the
condition of altitude below 2000 meter and non-tropical climate. And the
equipment which are used under the condition of altitude above 2000 meter or
tropical climate REQUIRE additional requirements, as defined in provision 1.1.2.
Due to the particularity of geographical and climatic conditions of China, and the
minority population distribution, after revising some clauses in IEC
60950-1:2005, this Part applies to the equipment which can be used under the
conditions of altitude below 5000 meter (including 5000 meter) and tropical
climate. For the equipment which is prescribed to only use at the altitude below
2000 meter and only use in non-tropical climate, the requirements may be
reduced correspondingly, however, it shall have warning description.
The third item of 1.1.2 in GB 4943 is modified as:
— equipment intended to be used in vehicles, on board ships or aircraft, at the
plateau of altitude greater than 5000 m;
f) Required value of electric clearance
At different altitude, there is different required value of clearance. To the
INFORMATION TECHNOLOGY EQUIPMENT - SAFETY
- Part 1: General requirements
1 General
1.1 Scope
1.1.1 Equipment covered by this Part
This part of GB 4943 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 Part 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 and intended to be connected directly to, or used as infrastructure
equipment in, a CABLE DISTRIBUTION SYSTEM, regardless of the source of
power;
− designed to use the AC MAINS SUPPLY as a communication transmission
medium (see Clause 6, Note 4 and 7.1, Note 4).
This Part is also applicable to components and subassemblies intended for
incorporation in information technology equipment. It is not expected that such
components and subassemblies comply with every aspect of the standard, provided
that the complete information technology equipment, incorporating such components
and subassemblies, does comply.
2.9 Electrical insulation
2.9.2 Humidity conditioning
If there are requirements by 2.9.1, 2.10.8.3, 2.10.10 or 2.10.11, humidity and heat
treatment shall be done indoor or in humidity-heat box with air temperature of
(40±2)°C, relative humidity of (93±3)％ for 120 h. During the humidity and heat
treatment, components or modules are not powered.
For equipment which are not prescribed to use under the condition of tropical climate,
if there are requirements by 2.9.1, 2.10.8.3, 2.10.10 or 2.10.11, humidity and heat
treatment shall be done indoor or in humidity-heat box with relative humidity of
(93±3)％ for 48 h. At all positions where can place samples, the air temperature
shall be maintained in any convenient range of temperature values (t±2)°C in
between 20°C and 30°C which will not produce condensation.
With the concurrence of the manufacturer, it is permitted to increase the 48 h time
duration.
2.10.3 Clearances
2.10.3.1 General
CLEARANCES shall be so dimensioned that overvoltages, including transients
that may enter the equipment, and peak voltages that may be generated
within the equipment, do not break down the CLEARANCE.
It is permitted to use either the requirements of 2.10.3 for Overvoltage Category I
or Overvoltage Category II, using the PEAK WORKING VOLTAGE; or the
requirements in Annex G for Overvoltage Category I, Overvoltage Category
II, Overvoltage Category III or Overvoltage Category IV, using the
REQUIRED WITHSTAND VOLTAGE, for a particular component or subassembly
or for the whole equipment. These requirements apply for equipment to be
operated up to 2 000 m above sea
These requirements apply to those equipment which are used at altitude below 2000
meter. For equipment which are prescribed to use at altitude between 2000-5000
meter, their minimum clearance shall multiply the multiplication factor 1.48 of
corresponding altitude of 5000 meter as given by Table A.2 in GB/T 16935.1*. For
equipment which are prescribed to use at altitude above 5000 meter, their minimum
clearance shall multiply the multiplication factor as given by Table A.2 in GB/T
16935.1. And it allows to use linear interpolation between the nearest adjacent 2
points in the Table A.2. The clearance value obtained by using multiplication factor to
calculate shall be rounded to one decimal place.
For equipment which are prescribed to use at altitude between 2000-5000 meter,
their minimum electrical clearance shall multiply the multiplication factor 1.48 of
corresponding altitude of 5000 meter as given by Table A.2 in GB/T 16935.1. For
equipment which are prescribed to use at altitude above 5000 meter, their minimum
clearance shall multiply the multiplication factor as given by Table A.2 table in GB/T
16935.1. And it allows to use linear interpolation between the nearest adjacent 2
points in the Table A.2. The clearance value obtained by using multiplication factor to
calculate shall be rounded to one decimal place.
......
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’s 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 & 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
Preface
All technical content in this Standard is compulsory.
This Standard is equivalent to IEC 60950: 1999 Safety of information technology equipment
Edition 3.
This is the second revision of GB 4943. GB 4943-1990 is equivalent to IEC 950-1986; GB
4943-1995 is equivalent to IEC 950-1991 Ed. 2. This Standard is equivalent to IEC 60950 Ed. 3.
Section 6 “connection to telecommunication network” is added in Edition 2. IEC 60950 Edition 3
has the following modification: the security requirement for connection to telecommunication
network” is incorporated in the topics of this Standard, and the content of this Standard is also
re-arranged by combining related topics for easy use. Technical update is also made according to
the issues proposed by Certification Bodies.
This Standard is intended to provide guideline for the design, manufacturing and use of
information technology products in China and allow manufacturers to implement product safety
certification for safety compliance.
This specification is in lieu of GB 4943-1995 since its enforcement.
Annex A, B, C, D, E, F, G, H, J, K, L, M, N, P, U, and V are normative annexes.
Annex Q, R, S, T, W and X are informative annex.
This Standard is proposed by PRC MII.
This Standard is managed by China Electronics Standardization Institute.
This Standard is developed by China Electronics Standardization Institute.
This Standard is written by: Li Lanfang, Wang Ying, Jiazhen.
This Standard was initially released on Dec. 28 1990.
This Standard was initially revised on Dec. 21 1995.
GB
P R C N a t i o n a l S t a n d a r d
GB 4943-2001
Eqv. IEC 60950: 1999
Safety of information technology equipment
1 General
1.1 Scope
1.1.1 Equipment covered by this Standard
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 (see
Clause 6, Note 4).
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.
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