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 29.1.1~2...