GB 4706.12-2006 English PDF

GB 4706.12-2006: Safety of household and similar electrical appliances -- Particular requirements for storage water heaters
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GB 4706.12-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.100
Y 63
Replacing GB 4706.12-1995
Safety of household and similar electrical appliances -
Particular requirements for storage water heaters
(IEC 60335-2-21:1997, MOD)
ISSUED ON: AUGUST 30, 2006
IMPLEMENTED ON: JULY 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
IEC foreword ... 6 
1 Scope ... 10 
2 Definitions ... 11 
3 General requirements ... 13 
4 General conditions of test ... 13 
5 Empty chapters ... 13 
6 Categories ... 13 
7 Signs and instructions ... 14 
8 Protection against touching live parts ... 15 
9 Start of electric appliances ... 15 
10 Input power and current ... 15 
11 Heating ... 15 
12 Empty chapter ... 16 
13 Leakage current and electrical strength at working temperature ... 16 
14 Empty chapter ... 16 
15 Moisture resistance ... 16 
16 Leakage current and electrical strength ... 16 
17 Overload protection of transformers and related circuits ... 16 
18 Durability ... 16 
19 Abnormal work ... 17 
20 Stability and mechanical hazards ... 18 
21 Mechanical strength ... 18 
22 Structure ... 18 
23 Internal wiring ... 21 
25 Power connection and external flexible cord ... 22 
26 Wiring terminals for external conductors ... 23 
27 Grounding measures ... 23 
28 Screws and connections ... 23 
29 Creepage distance, electrical clearance, penetrated insulation distance .. 23 
30 Heat resistance, flame resistance, tracking resistance ... 23 
31 Rust prevention ... 24 
32 Radiation, toxicity and similar hazards ... 24 
Appendix ... 26 
Appendix AA (Normative) Additional requirements for category I water heaters
that provide emergency protection in the event of an abnormal grounding
system ... 26 
Foreword
All contents of this part of GB 4706 are mandatory.
GB 4706 " Safety of household and similar electrical appliances" is divided into
the following parts:
- Part I: General requirements;
- Part II: Particular requirements.
This part is the particular requirements for storage water heaters.
This part replaces GB 4706.12-1995 "Safety of household and similar electrical
appliances - Particular requirements for storage water heaters".
This part modifies and adopts IEC 60335-2-21:1997. This part shall be used in
conjunction with GB 4706.1-1998.
This part is formed by adding or modifying GB 4706.1. The specific provisions
in GB 4706.1 are not mentioned in this part, which means that the
corresponding provisions in GB 4706.1 apply to this part. In this part, the portion
indicated as “applicable” means that the corresponding provisions in GB 4706.1
are applicable to this part. In this part, the portion indicated as “replaced” means
that the provisions of this part shall prevail. In this part, the portion indicated as
“added” means that in addition to the corresponding provisions of GB 4706.1,
it must also comply with the provisions added in this part.
The main difference between this part and IEC 60335-2-21:1997 is the addition
of Appendix AA (normative).
Appendix AA to this part is a normative appendix.
This part was proposed by China Light Industry Federation.
This part shall be under the jurisdiction and interpretation of the National
Household Appliance Standardization Technical Committee (SAC/TC 46).
Drafting organizations of this part: China Household Electrical Appliances
Research Institute, Haier Water Heater Co., Ltd., Aio Smith (China) Water
Heater Co., Ltd., Shuaikang Water Heater Co., Ltd., Kangquan Water Heater
Co., Ltd., Meroni Sanitary Ware (China) Co., Ltd., Shenzhen Entry and Exit
Inspection and Quarantine Bureau.
The main drafters of this part: Ma Dejun, Hou Quanduo, Wan Huaxin, Li Yi,
Zhang Huibao, Xu Zhong, Xie Jinxiong, Ji Bing.
Safety of household and similar electrical appliances -
Particular requirements for storage water heaters
1 Scope
This chapter of GB 4706.1-1998 is replaced by the following:
This part of GB 4706 relates to the safety of storage water heaters whose
single-phase appliances have a rated voltage not exceeding 250 V, and other
appliances whose rated voltage does not exceed 480 V for domestic and similar
purposes.
Appliances that are not intended for general household use but still pose a
danger to the public, such as appliances intended for use by persons without
knowledge of electricity in shops, light industries, and farms are also within the
scope of this part.
As a practical matter, this part deals with general hazards that arise from
appliances that can be encountered by everyone in the home and surrounding
environment.
This part generally does not consider the following situations:
- Appliances used by children, old, young, sick, and weak without care;
- Children playing with appliances.
Note 1: Attention is drawn to the following:
- Additional requirements may be required for appliances intended for use on
plateaus;
- Additional requirements may be required for appliances intended for use on a
vehicle, ship or aircraft;
- Additional requirements may be required for appliances intended for use in tropical
countries;
- Additional requirements have been developed by health, labor protection, water
and similar authorities in many countries;
- In many countries there are also installation regulations for appliances connected
to water.
Note 2: This part does not apply to:
- Appliances for boiling water (IEC 60335-2-15);
- Fast-heating water heater (IEC 60335-2-35);
- Commercial electric hot water boilers and liquid heaters (IEC 60335-2-63);
- Commercial vending machines (IEC 60335-2-75);
- Appliances intended for industrial use;
- Equipment intended for use in special places, such as places with corrosive and
explosive gases (dust, steam or gas).
Note 3: Category I water heaters that provide emergency protection when the
grounding system is abnormal shall meet the requirements of Appendix AA.
2 Definitions
This chapter of GB 4706.1-1998 applies except for the following:
2.2.9 Replacement:
Normal operation
The work of appliance after installation and filling with cold water according
to the instructions.
2.101
Storage water heater
A fixed appliance that heats and stores water in a container and is equipped
with a water temperature control device.
Note: The container can be insulated or uninsulated.
2.102
Closed water heater
The water storage heater that does not communicates with the atmosphere
and is designed to work under the pressure of the water supply system,
whose water flow is controlled by one or more valves in the water outlet
system.
Note 1: A simplified diagram of a closed water heater is as shown in Figure 101a).
GB 4706.12-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.100
Y 63
Replacing GB 4706.12-1995
Safety of household and similar electrical appliances -
Particular requirements for storage water heaters
(IEC 60335-2-21:1997, MOD)
ISSUED ON: AUGUST 30, 2006
IMPLEMENTED ON: JULY 01, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4 
IEC foreword ... 6 
1 Scope ... 10 
2 Definitions ... 11 
3 General requirements ... 13 
4 General conditions of test ... 13 
5 Empty chapters ... 13 
6 Categories ... 13 
7 Signs and instructions ... 14 
8 Protection against touching live parts ... 15 
9 Start of electric appliances ... 15 
10 Input power and current ... 15 
11 Heating ... 15 
12 Empty chapter ... 16 
13 Leakage current and electrical strength at working temperature ... 16 
14 Empty chapter ... 16 
15 Moisture resistance ... 16 
16 Leakage current and electrical strength ... 16 
17 Overload protection of transformers and related circuits ... 16 
18 Durability ... 16 
19 Abnormal work ... 17 
20 Stability and mechanical hazards ... 18 
21 Mechanical strength ... 18 
22 Structure ... 18 
23 Internal wiring ... 21 
25 Power connection and external flexible cord ... 22 
26 Wiring terminals for external conductors ... 23 
27 Grounding measures ... 23 
28 Screws and connections ... 23 
29 Creepage distance, electrical clearance, penetrated insulation distance .. 23 
30 Heat resistance, flame resistance, tracking resistance ... 23 
31 Rust prevention ... 24 
32 Radiation, toxicity and similar hazards ... 24 
Appendix ... 26 
Appendix AA (Normative) Additional requirements for category I water heaters
that provide emergency protection in the event of an abnormal grounding
system ... 26 
Foreword
All contents of this part of GB 4706 are mandatory.
GB 4706 " Safety of household and similar electrical appliances" is divided into
the following parts:
- Part I: General requirements;
- Part II: Particular requirements.
This part is the particular requirements for storage water heaters.
This part replaces GB 4706.12-1995 "Safety of household and similar electrical
appliances - Particular requirements for storage water heaters".
This part modifies and adopts IEC 60335-2-21:1997. This part shall be used in
conjunction with GB 4706.1-1998.
This part is formed by adding or modifying GB 4706.1. The specific provisions
in GB 4706.1 are not mentioned in this part, which means that the
corresponding provisions in GB 4706.1 apply to this part. In this part, the portion
indicated as “applicable” means that the corresponding provisions in GB 4706.1
are applicable to this part. In this part, the portion indicated as “replaced” means
that the provisions of this part shall prevail. In this part, the portion indicated as
“added” means that in addition to the corresponding provisions of GB 4706.1,
it must also comply with the provisions added in this part.
The main difference between this part and IEC 60335-2-21:1997 is the addition
of Appendix AA (normative).
Appendix AA to this part is a normative appendix.
This part was proposed by China Light Industry Federation.
This part shall be under the jurisdiction and interpretation of the National
Household Appliance Standardization Technical Committee (SAC/TC 46).
Drafting organizations of this part: China Household Electrical Appliances
Research Institute, Haier Water Heater Co., Ltd., Aio Smith (China) Water
Heater Co., Ltd., Shuaikang Water Heater Co., Ltd., Kangquan Water Heater
Co., Ltd., Meroni Sanitary Ware (China) Co., Ltd., Shenzhen Entry and Exit
Inspection and Quarantine Bureau.
The main drafters of this part: Ma Dejun, Hou Quanduo, Wan Huaxin, Li Yi,
Zhang Huibao, Xu Zhong, Xie Jinxiong, Ji Bing.
Safety of household and similar electrical appliances -
Particular requirements for storage water heaters
1 Scope
This chapter of GB 4706.1-1998 is replaced by the following:
This part of GB 4706 relates to the safety of storage water heaters whose
single-phase appliances have a rated voltage not exceeding 250 V, and other
appliances whose rated voltage does not exceed 480 V for domestic and similar
purposes.
Appliances that are not intended for general household use but still pose a
danger to the public, such as appliances intended for use by persons without
knowledge of electricity in shops, light industries, and farms are also within the
scope of this part.
As a practical matter, this part deals with general hazards that arise from
appliances that can be encountered by everyone in the home and surrounding
environment.
This part generally does not consider the following situations:
- Appliances used by children, old, young, sick, and weak without care;
- Children playing with appliances.
Note 1: Attention is drawn to the following:
- Additional requirements may be required for appliances intended for use on
plateaus;
- Additional requirements may be required for appliances intended for use on a
vehicle, ship or aircraft;
- Additional requirements may be required for appliances intended for use in tropical
countries;
- Additional requirements have been developed by health, labor protection, water
and similar authorities in many countries;
- In many countries there are also installation regulations for appliances connected
to water.
Note 2: This part does not apply to:
- Appliances for boiling water (IEC 60335-2-15);
- Fast-heating water heater (IEC 60335-2-35);
- Commercial electric hot water boilers and liquid heaters (IEC 60335-2-63);
- Commercial vending machines (IEC 60335-2-75);
- Appliances intended for industrial use;
- Equipment intended for use in special places, such as places with corrosive and
explosive gases (dust, steam or gas).
Note 3: Category I water heaters that provide emergency protection when the
grounding system is abnormal shall meet the requirements of Appendix AA.
2 Definitions
This chapter of GB 4706.1-1998 applies except for the following:
2.2.9 Replacement:
Normal operation
The work of appliance after installation and filling with cold water according
to the instructions.
2.101
Storage water heater
A fixed appliance that heats and stores water in a container and is equipped
with a water temperature control device.
Note: The container can be insulated or uninsulated.
2.102
Closed water heater
The water storage heater that does not communicates with the atmosphere
and is designed to work under the pressure of the water supply system,
whose water flow is controlled by one or more valves in the water outlet
system.
Note 1: A simplified diagram of a closed water heater is as shown in Figure 101a).