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GB 4706.1-2005 English PDF (GB4706.1-2005)

GB 4706.1-2005 English PDF (GB4706.1-2005)

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GB 4706.1-2005: Household and similar electrical appliances -- Safety -- Part 1: General requirements

GB 4706.1-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.120
K 09
GB 4706.1-2005 / IEC 60335-1:2004 (Ed4.1)
Replacing GB 4706.1-1998
Household and Similar Electrical Appliances -
Safety - Part 1: General Requirements
(IEC 60335-1:2004 (Ed4.1), IDT)
ISSUED ON: AUGUST 26, 2005
IMPLEMENTED ON: AUGUST 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 6
IEC Foreword ... 9
Introduction ... 16
1 Scope ... 17
2 Normative references ... 18
3 Definitions ... 22
4 General Requirement ... 32
5 General Conditions for the Tests ... 32
6 Classification ... 36
7 Marking and Instructions ... 36
8 Protection against Access to Live Parts ... 44
9 Starting of Motor-Operated Appliances ... 46
10 Power Input and Current ... 46
11 Heating ... 48
12 Void ... 54
13 Leakage Current and Electric Strength at Operating Temperature ... 54 14 Transient Overvoltage ... 57
15 Moisture Resistance ... 58
16 Leakage Current and Electric Strength ... 61
17 Overload Protection of Transformers and Associated Circuits... 63
18 Endurance ... 63
19 Abnormal Operation ... 63
20 Stability and Mechanical Hazards ... 73
21 Mechanical Strength ... 74
22 Construction ... 76
23 Internal Wiring ... 88
24 Components ... 90
25 Supply Connection and External Flexible Cords ... 93
26 Terminals for External Conductors ... 103
27 Provision for Earthing ... 106
28 Screws and Connections ... 109
29 Clearances, Creepage Distances and Solid Insulation ... 112
30 Resistance to Heat and Fire ... 119
31 Resistance to Rusting ... 123
32 Radiation, Toxicity and Similar Hazards ... 123
Appendix A (Informative) Routine Tests ... 133
Appendix B (Normative) Appliances Powered by Rechargeable Batteries .. 136 Appendix C (Normative) Ageing Test on Motors ... 139
Appendix D (Normative) Thermal Motor Protectors ... 141
Appendix E (Normative) Needle Flame Test ... 142
Appendix F (Normative) Capacitors ... 143
Appendix G (Normative) Safety Isolating Transformers ... 145
Appendix H (Normative) Switches ... 146
Appendix I (Normative) Motors Having Basic Insulation That is Inadequate for the Rated Voltage of the Appliance ... 148
Appendix J (Normative) Coated Printed Circuit Boards ... 150
Appendix K (Normative) Overvoltage Categories ... 151
Appendix L (Informative) Guidance for the Measurement of Clearances and Creepage Distances ... 152
Appendix M (Normative) Pollution Degree ... 154
Appendix N (Normative) Proof Tracking Test ... 156
Appendix O (Informative) Selection and Sequence of the Tests of Clause 30 ... 157
Appendix P (Informative) Guidance for the Application of this Part to
Appliances used in warm damp equable climates ... 159
Appendix Q (Informative) Sequence of Tests for the Evaluation of Electronic Circuits ... 161
Appendix R (Normative) Software Evaluation ... 163
Figure 1 -- Circuit Diagram for Leakage Current Measurement ... 124
Figure 2 -- Circuit Diagram for Leakage ... 124
Figure 3 -- Circuit Diagram for Leakage Current Measurement ... 125
Figure 4 -- Circuit Diagram for Leakage Current ... 126
Figure 5 -- Void ... 126
Figure 6 -- Example of An Electronic Circuit with Low-Power Points ... 127 Figure 7 -- Test Finger Nail ... 128
Figure 8 -- Flexing Test Apparatus ... 128
Figure 9 -- Constructions of Cord Anchorages ... 130
Figure 10 -- An Example of Parts of An Earthing Terminal ... 130
Figure 11 -- Examples of Clearances ... 132
Figure I.1 -- Simulation of Faults ... 149
Figure L.1 -- Sequence for the Determination of Clearances ... 153
Figure L.2 -- Sequence for the Determination of Creepage Distance ... 153 Figure O.1 -- Tests for Resistance to Heat ... 157
Figure O.2 -- Tests for Resistance to Fire ... 158
Table 1 -- Power Input Deviation ... 47
Table 2 -- Current Deviation ... 48
Table 3 -- Maximum Normal Temperature Rise ... 52
Table 4 -- Voltage for Electric Strength Test ... 56
Table 5 -- Characteristics of High-Voltage Sources ... 57
Table 6 -- Impulse Test Voltage ... 57
Table 7 -- Test Voltage ... 62
Table 8 -- Maximum Winding Temperature ... 66
Table 9 -- Maximum Abnormal Temperature Rise ... 72
Table 10 -- Dimensions of Cables and Conduits ... 95
Table 11 -- Minimum Cross-Sectional Area of Conductors ... 97
Table 12 -- Pull Force and Torque ... 99
Table 13 -- Nominal Cross-Sectional Area of Conductors ... 105
Table 14 -- Torque for Testing Screws and Nuts ... 110
Table 15 -- Rated Impulse Voltage ... 113
Table 16 -- Minimum Clearance ... 113
Table 17 -- Minimum Creepage Distance for Basic Insulation ... 117
Table 18 -- Minimum Creepage Distance for Functional Insulation ... 118 Table A.1 -- Test Voltage ... 134
Table C.1 -- Test Conditions ... 139
Bibliography ... 165
Foreword
All technical contents in this Part are mandatory.
GB 4706 is the serial standards for Safety of Household and Similar Electrical Appliances; which can be divided into the following parts:
Part 1: General Requirements;
Part 2: Particular Requirements.
This Part belongs to Part 1 of GB 4706.
This Part equivalently adopted IEC 60335-1 Household and Similar Electrical Appliances – Safety – General Requirements (Ed4.1) (2004). If there are corresponding national standards in this Part, then refer and quote the national standards; if there are no corresponding national standards, then refer the listed IEC standards.
The arranging order for Clause 2 Normative References in this Part is different from the IEC 60335-1.
This Part replaced GB 4706.1-1998 Safety of Household and Similar Electrical Appliances – Part 1: General Requirements. The major differences between this Part and GB 4706.1-1998 are as follows:
1) This Part’s Clause 14 is Transient Overvoltage. The Clause 14 in GB 4706.1- 1998 is void.
2) Add NOTE 5 to 19.1.
3) Add NOTE to 19.2, 19.3: the active controller in the test is allowed to act in Clause 11.
4) Delete NOTE 2 from 19.9.
5) Cancel NOTE1 and NOTE 3 from 19.11. Modify NOTE 2 into: generally, the inspection of appliances and circuit diagram reveals the fault situation that must be simulated; so that the test can be limited to those situations with the worst expected possible outcome.
6) Add 19.11.3~19.11.4.7 to Clause 19; while Clause 19 in GB 4706.1-1998 has no such sub-clauses.
7) Add the following content to 19.13:
If the appliance is still runnable, the appliance shall not go through the hazardous function failure; and protect the electronic circuit against the failure. GB 4706.1- 1998 has no such requirement.
8) Add the instructions to Clause 29:
The appliance structure can ensure the clearance, creepage distance and solid insulation are sufficient to withstand the electrical stress that the appliance may withstand.
It can be confirmed whether qualified through the requirements and tests from 29.1 to 29.3.
If using coating protection microenvironment (Type-A coating) or providing basic insulation (Type-B coating) on the printed circuit board; then Appendix J applies. In the microenvironment using the Type-A coating, Class-1 contamination deposits. If Type-B coating is used, then no requirements are provided against the clearance and creepage distance. GB 4706.1-1998 has no such instructions. 9) Add 29.1.1~29.1.5 to Clause 29; GB 4706.1-1998 has no requirements for the former sub-clauses.
10) Add 29.2.3~29.3.3 to Clause 29; GB 4706.1-1998 doesn’t have the former sub- clauses.
After the implementation of this Part, it shall gradually replace GB 4706.1-1998, because the particular requirements for various household appliances combined use with this Part need a very long time to be completely amended. Before the complete amendment, this Part is only applicable to the particular requirements for newly- amended household appliance combined use with this Part.
This Part’s Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Appendix G, Appendix H, Appendix I, Appendix J, Appendix K, Appendix M, Appendix N and Appendix R are normative; Appendix A, Appendix L, Appendix O, Appendix P and Appendix Q are informative; in which, the Appendix I, Appendix Q and Appendix R are newly-added.
This Part was proposed by China Light Industry Council.
This Part shall be under the jurisdiction of and interpreted by National Technical Committee for Standardization of Household Appliances.
Drafting organizations of this Part: China Household Electrical Appliances Research Institute, Guangzhou Research Institute of Electric Appliance Science.
Participating drafting organizations of this Part: Haier Group, Jiangsu Chunlan Refrigerating Equipment Stock Co., Ltd., China Quality Certification Center, Shanghai Entry-Exit Inspection and Quarantine Bureau, Guangzhou Electric Safety Testing Household and Similar Electrical Appliances –
Safety – Part 1: General Requirements
1 Scope
This Part deals with the safety of electrical appliances for household and similar purposes, their rated voltage being not more than 250V for single-phase appliances and 480V for other appliances.
Appliances not intended for normal household use but which nevertheless may be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this Part. NOTE 1: Examples of such appliances are catering equipment, cleaning appliances for industrial and commercial use, and appliances for hairdressers.
As far as is practicable, this Part deals with the common hazards presented by appliances that are encountered by all persons in and around the home.
However, in general, it does not take into account:
- The use of appliances by young children or infirm persons without supervision, - Playing with the appliance by young children.
NOTE 2: Attention is drawn to the fact that:
- for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements may be necessary;
- In many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labor, the national water supply authorities and similar authorities.
NOTE 3: This Part does not apply to:
- Appliances intended exclusively for industrial purposes;
- Appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
- Audio, video and similar electronic apparatus (GB 8898);
NOTE 3: If an appliance has to be dismantled in order to carry out a test, care is to be taken to insure that it is reassembled as originally supplied. In case of doubt, subsequent tests may be carried out on a separate sample.
5.3 The tests are carried out in the order of the clauses. However, the test of 22.11 on the appliance at room temperature is carried out before the tests of Clause 8. The tests of Clause 14 and 21.2 and 22.24 are carried out after the tests of Clause 29. If it is evident from the construction of the appliance that a particular test is not applicable, the test is not carried out.
5.4 When testing appliances that are also supplied by other energies such as gas, the influence of their consumption has to be taken into account.
5.5 The tests are carried out with the appliance or any movable part of it placed in the most unfavorable position that may occur in normal use.
5.6 Appliances provided with controls or switching devices are tested with these controls or devices adjusted to their most unfavorable setting, if the setting can be altered by the user.
NOTE 1: If the adjusting means of the control is accessible without the aid of a tool, this sub- clause applies whether the setting can be altered by hand or with the aid of a tool. If the adjusting means is not accessible without the aid of a tool and if the setting is not intended to be altered by the user, this sub-clause does not apply.
NOTE 2: Adequate sealing is regarded as preventing alteration of the setting by the user. 5.7 The tests are carried out in a draught-free location at an ambient temperature of 20°C±5°C.
If the temperature attained by any part is limited by a temperature sensitive device or is influenced by the temperature at which a change of state occurs, for example when water boils, the ambient temperature is maintained at 23°C±2°C in case of doubt. 5.8.1 Appliances for a.c. only are tested with a.c. at rated frequency, and those for a.c. and d.c. are tested at the more unfavorable supply.
Appliances for a.c. that are not marked with rated frequency or are marked with a frequency range of 50 Hz to 60 Hz are tested with either 50 Hz or 60 Hz, whichever is the more unfavorable.
5.8.2 Appliances having more than one rated voltage are tested on the basis of the most unfavorable voltage .
For motor-operated appliances, and combined appliances, marked with a rated voltage range, when it is specified that the supply voltage is equal to the rated voltage

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