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GB 25034-2020: PDF in English
GB 25034-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.99
P 46
Gas-fired heating and hot water combi-boilers
ISSUED ON. SEPTEMBER 02, 2010
IMPLEMENTED ON. JULY 01, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Classifications and their parameters ... 11
5 Material, construction and safety requirements ... 13
6 Performance requirements ... 23
7 Test methods ... 39
8 Inspection rules ... 92
9 Markings, warnings and instructions ... 94
10 Packaging, transportation and storage ... 100
Annex A (informative) Comparison between the clause number of this
Standard and the clause number of EN 483.1999 and EN 625.1996 ... 101
Annex B (informative) Technical differences between this Standard and EN
483.1999 and EN 625.1996 and their causes ... 102
Annex C (informative) Classification according to air supply and combustion
products evacuation installation method ... 103
Annex D (informative) Composition of gas automatic shut-off valve in gas
system and requirements for sealing force ... 106
Annex E (Informative) NOx pollution ... 108
Annex F (normative) Electrical safety of appliances using AC power supply113
Annex G (normative) Electromagnetic compatibility safety ... 124
Annex H (informative) Test method for the heat losses from the test rig of the
indirect method and the contributions of the circulating pump of the test rig 127
Annex I (informative) Test method for the ignition time at full load ... 128
Bibliography ... 129
Foreword
5.3.8, 5.4.3, 5.5.1, 5.5.2, 6.2.1, 6.3.4, 6.4.4, 6.5.3.2, 6.5.5.1 a), b), c), 6.5.5.2
a), b), c), d), e), 6.5.7.3 a), b), 6.6.2, 6.8.2, 9.1.1 d), 9.1.2, 9.2.1, 9.2.2 and
Annex F of this Standard are mandatory and the rest are recommended.
This Standard modifies EN 483.1999 “Gas-fired central heating boilers - Type
C boilers of nominal heat input not exceeding 70 kW” (English version) and EN
625.1996 “Gas-fired central heating boilers - Specific requirements for the
domestic hot water operation of combination boilers of nominal heat input not
exceeding 70 kw” (English version).
In order to facilitate comparison, a list of the comparison of the clauses of this
Standard and the clauses modified of the European standards is listed in Annex
A.
Due to the legal requirements of China and the special needs of industry, this
Standard was revised when the two European standards were adopted. A list
of technical differences and their causes is given in Annex B for reference.
This Standard deletes the following contents in EN 483.1999.
1) Annex A. Product classification and supply conditions of European
Community countries;
2) Annex B. Particular national conditions;
3) Annex E. Compilation of the test conditions;
4) Annex K. Examples for marking;
5) Annex N. Requirements and test methods for separate air supply and
combustion products evacuation ducts of type C6 boilers;
6) Annex Z. Clauses of this European standard addressing essential
requirements or other provisions of EU Directives;
7) Relevant content that the maximum heating working water pressure of
appliances is 6 kg.
Annexes D, F and G of this standard are normative annexes, Annexes A, B, C,
E, H, and I are informative annexes.
This Standard was proposed by Ministry of Housing and Urban-Rural
Development of the People’s Republic of China.
This Standard shall be under the jurisdiction of Ministry of Housing and Urban-
Gas-fired heating and hot water combi-boilers
1 Scope
This Standard specifies the terms and definitions, classifications and their
parameters, material, construction and safety requirements, performance
requirements, test methods, inspection rules, markings, warnings and
instructions, packaging, transportation and storage of closed gas-fired heating
and hot water combi-boilers (hereinafter referred to as “appliances”).
This Standard applies to heating and hot water combi-appliances of which the
rated heat input is less than or equal to 70 kW, the maximum heating working
water pressure is less than or equal to 0.3 MPa, the water temperature during
work is not greater than 95 °C, using atmospheric burner or fan-assisted burner
or full premix burner. This Standard also applies to single heating appliances.
This Standard does not apply to the following appliances.
- outdoor appliances with natural combustion products evacuation duct;
- condensing type appliances;
- combination type appliances;
- appliances in which two sets of independent combustion systems are used
for heating and hot water in the same enclosure, including appliances of
which heating and hot water systems have common duct.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For dated references, their
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 191 Packaging - Pictorial marking for handling of goods (GB/T 191-
2008, ISO 780.1997, MOD)
GB/T 1019-2008 General requirements for the package of household and
similar electrical appliances
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection (GB/T 2828.1-2003, ISO 2859-1.1999, IDT)
GB/T 2828.2 Sampling procedures for inspection by attributes - Part 2.
Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
(GB/T 2828.2-2008, ISO 2859-2.1985, NEQ)
GB 4208 Degrees of protection provided by enclosure (IP code) (GB 4208-
2008, IEC 60529.2001, IDT)
GB 4706.1-2005 Household and similar electrical appliances - Safety - Part
1. General requirements (IEC 60335-1.2004 (Ed4.1), IDT)
GB/T 5013.1 Rubber insulated cables of rated voltages up to and including
450/750 V - Part 1. General requirements (GB 5013.1-2008, IEC 60245-
1.2003, IDT)
GB 5023.1 Polyvinyl chloride insulated cables of rated voltages up to and
including 450/750 V - Part 1. General requirements (GB 5023.1-2008, IEC
60227-1.2007, IDT)
GB/T 7306.1 Pipe threads with 55 degree thread angle where pressure-tight
joints are made on the threads - Part 1. Parallel internal and taper external
threads (GB/T 7306.1-2000, eqv ISO 7-1.1994)
GB/T 7306.2 Pipe threads with 55 degree threads angle where pressure-
tight joints are made on the threads - Part 2. Taper internal and threads (GB/T
7306.2-2000, eqv ISO 7-1.1994)
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight
joints are not made on the threads (GB/T 7307-2001, eqv ISO 228-1.1994)
GB/T 12113-2003 Methods of measurement of touch current and protective
conductor current (IEC 60990-1999, IDT)
GB/T 13611 Classification and essential property of city gas
GB 14536.1 Automatic electrical controls for household and similar use - Part
1. General requirements (GB 14536.1-2008, IEC 60730-1.2003, IDT)
GB 14536.6 Automatic electrical controls for household and similar use -
Particular requirements for automatic electrical burner control systems (GB
14536.6-2008, IEC 60730-2-5.2004, IDT)
GB 14536.10 Automatic electrical controls for household and similar use -
Particular requirements for temperature sensing controls (GB 14536.10-
2008, IEC 60730-2-9.2004, IDT)
GB/T 16411 Universal test methods of gas burning appliances for domestic
use
GB/T 17624.1-1998 Electromagnetic compatibility - General - Application
and interpretation of fundamental definitions and terms (idt IEC 61000-1-
1.1992)
GB/T 17626.1 Electromagnetic compatibility - Testing and measurement
techniques - Overview of immunity tests (GB/T 17626.1-2006, IEC 61000-4-
1.2000, IDT)
GB/T 17626.4 Electromagnetic compatibility - Testing and measurement
techniques - Electrical fast transient/burst immunity test (GB/T 17626.4-2008,
IEC 61000-4-4.2004, IDT)
GB/T 17626.5 Electromagnetic compatibility - Testing and measurement
techniques - Surge immunity test (GB/T 17626.5-2008, IEC 61000-4-5.2005,
IDT)
GB/T 17626.11 Electromagnetic compatibility - Testing and measurement
techniques - Voltage dips, short interruptions and voltage variations immunity
tests (GB/T 17626.11-2008, IEC 61000-4-11.2004, IDT)
GB/T 17627.1 High-voltage test techniques for low voltage equipment - Part
1. Definitions, test and procedure requirements (GB 17627.1-1998, eqv IEC
1180-1.1992)
GB/T 17799.1-1999 Electromagnetic compatibility - Generic standards -
Immunity for residential, commercial and light-industrial environments (idt
IEC 61000-6-1.1997)
CJ/T 3074 Electronic controller of domestic gas-fired appliances
3 Terms and definitions
For the purposes of this Standard, the following terms and definitions and those
established in GB 4706.1, GB 14536.1, GB 14536.6, GB 14536.10, GB/T 16411,
GB/T 17624.1 and CJ/T 3074 apply.
3.1
gas restrictor
Key.
a - Air supply and combustion products evacuation installation method code;
b - Heating system construction code.
5 Material, construction and safety requirements
5.1 General
Except where otherwise stated, the requirements are verified by visual
inspection of the appliance and its relevant technical documents.
5.2 Materials
5.2.1 General requirements for materials
a) During a reasonable life stated by the manufacture and under normal
conditions of installation and use, changes in its material and construction
shall not impair the safety of the appliance;
b) Materials that are in contact with gas and combustion products shall be
resistant to corrosion or subjected to corrosion resistance treatment;
c) Domestic hot water pipes shall be made of corrosion-resistant materials
and materials that do not pollute domestic hot water.
d) The thermal insulation material shall not contain asbestos, shall be of non-
combustible material, and shall withstand the expected thermal and
mechanical stresses;
e) The solder of appliances shall not contain hexavalent cadmium;
f) The enclosure of the combustion chamber shall be made of metallic
materials;
g) The important materials related to safety, the characteristics of which shall
be guaranteed by the manufacturer of the appliances and the supplier of
the materials, e.g. by providing the necessary written certification.
5.2.2 Thermal insulation materials
a) The thermal insulation material of appliances shall withstand a
temperature of at least 120 °C without deformation and shall retain its
insulating properties under the influences of heat and ageing.
b) The thermal insulation material shall withstand the expected thermal and
mechanical stresses.
f) A filter mesh shall be fitted at the gas inlet, and the grid does not allow a 1
mm pin gauge to pass through. If the gas circuit contains a class D or D'
automatic valve, the maximum diameter of the pin gauge shall be 0.2 mm.
5.3.3.2 Soundness of combustion system
a) Parts which have to be removed during routine service and affect the
soundness of the appliance’s combustion system, shall be sealed by
mechanical means.
b) Where the boiler case forms part of the combustion system, there shall be
no leakage of combustion products into the room where the appliance is
installed.
5.3.4 Air supply and combustion products evacuation system
5.3.4.1 General
a) Appliances shall be designed so that there is an adequate supply of
combustion air during ignition and over the whole range of possible heat
inputs stated by the manufacturer.
b) Fan-assisted appliances may be fitted with an adjustment device in the
combustion system, either by restrictors or by setting the adjustment
device to predetermined positions in accordance with instructions from the
manufacturer, intended to adapt the appliance to the pressure losses in
the combustion products evacuation system.
5.3.4.2 Air supply and combustion products evacuation ducts
During installation of air supply and combustion products evacuation ducts, no
work is necessary other than adjusting the length (possibly by cutting them).
Such adaptation shall not impair the correct operation of the appliance.
5.3.4.3 Wind protection device
When pressing a steel ball with a diameter of 16 mm with a force of 5 N, the
ball shall not enter the wind protection device.
5.3.4.4 Fan
a) Direct access to the rotating parts of a fan shall be prevented.
b) The parts of a fan in contact with combustion products shall be able to
withstand the high temperatures of the combustion products; The parts of
a fan in contact with combustion products shall be made of corrosion
resistant material, or subjected to corrosion resistance treatment.
c) The positions of the temperature selector shall be recognizable and it shall
be possible to ascertain in which direction the water temperature rises or
falls. If numbers are used for this purpose, the highest number shall
correspond to the highest temperature.
d) At its maximum setting, it shall cause at least controlled off before the
water flow temperature exceeds 95 °C.
5.5.4 Limit thermostat
a) The limit thermostat shall comply with the requirements of GB 14536.1 for
type I devices.
b) It shall not be possible to alter the maximum set point of the limit
thermostat.
c) When the water temperature falls below its set point, the appliance shall
restart the ignition process and resume normal operation.
d) The limit thermostat shall cause at least safety shutdown before the water
flow temperature exceeds 110 °C.
5.5.5 Overheat cut-off device
a) The overheat cut-off device shall comply with the requirement of GB
14536.1 for type II devices.
b) This device shall cause non-volatile lockout before the appliance is
damaged or before a dangerous situation for the user occurs.
c) This device shall not be adjustable and normal operation of the appliance
shall not give rise to a change in its set point temperature.
d) Interruption of the link between the sensor and the device responding to
its signal shall cause at least safety shutdown.
5.5.6 Safety temperature limiter
a) The safety temperature limiter shall comply with the requirements of GB
14536.1 for type II devices.
b) In addition to the requirements stated in 5.5.5, the safety temperature
limiter shall cause non-volatile lockout before the water flow temperature
exceeds 110 °C.
5.5.6 Temperature sensors
Thermostats, limit thermostats, overheat cut-off devices and safety temperature
input less than the rated heat input, the ignition heat input shall not exceed the
rated value specified by the manufacturer.
6.3.4 Heating rated heat output
Under the test conditions of 7.3.4, the heating heat output shall be greater than
or equal to the heating rated heat output.
6.3.5 Hot water rated heat input
Under the test conditions of 7.3.5, the rated hot water heat input shall be
reached, or it may be adjusted to be within ±10 % of the rated hot water heat
input.
6.3.6 Hot water production rate
Under the test conditions of 7.3.6, the measured value of the hot water
production rate shall not be lower than 95 % of the nominal value of the
manufacture.
6.4 Safety of operation
6.4.1 Surface temperature rise
6.4.1.1 Surface temperature rise of adjusting, control and safety devices
Under the test conditions of 7.4.1.1, the surface temperature rise of adjusting,
control and safety devices shall not exceed the value specified by the
manufacturer and their operation shall remain satisfactory. For the control
knobs and all the parts that have to be touched during normal use, the surface
temperature rise of metal parts shall be less than or equal to 35 K; the surface
temperature rise of porcelain parts shall be less than or equal to 45 K; the
surface temperature rise of plastic parts shall be less than or equal to 60 K.
6.4.1.2 Surface temperature rise of side, front and top of appliances
Under the test conditions of 7.4.1.2, the surface temperature rise of side, front,
and top of appliances, other than parts of the case within 5 cm of the edge of
the sight glass, and within 15 cm of the combustion products evacuation duct,
shall be less than or equal to 80 K.
6.4.1.3 Surface temperature rise of test panel and installation base panel
Under the test conditions of 7.4.1.3, the surface temperature rise of test panels
and installation base panels shall be less than or equal to 80 K. When the
installation base panel and the wall body are composed of flammable materials,
and the surface temperature rises to 60 K to 80 K, the manufacture shall provide
correctly when the fan stops during the standby time.
6.5 Adjusting, control and safety devices
6.5.1 Basic requirements
Under the test conditions of 7.5.1, the devices shall operate correctly at the
maximum temperature and when the voltage is varied between 0.85 times and
1.1 times the rated voltage. For voltages below 0.85 times the rated voltage,
the devices shall either continue to assure safety or cause safety shutdown.
6.5.2 Control devices
6.5.2.1 Rotary knob
Under the test conditions of 7.5.2.1, the torque of a rotary knob shall be less
than or equal to 0.6 N • m.
6.5.2.2 Push-button
Under the test conditions of 7.5.2.2, the force required to open and/or close the
push-button shall be less than or equal to 45 N.
6.5.3 Automatic valves
6.5.3.1 Sealing force
Under the test conditions of 7.5.3.1, the leakage rate of class B and class C
valves shall meet the requirements of Table D.1 in Annex D.
6.5.3.2 Closing function
Under the test conditions of 7.5.3.2, the closing function of valves shall meet
the following requirements.
a) The valves shall close automatically before the voltage reaches 0.15 times
the minimum rated voltage.
b) The valves shall close automatically on interruption of the electricity supply
when the electrical supply voltage is between 0.15 times the minimum
rated voltage and 1.1 times the maximum rated voltage.
c) For pneumatic or hydraulic valves, the valves shall close automatically
when the actuating pressure is reduced to 0.15 times the maximum rated
actuating pressure specified by the manufacturer.
6.5.3.3 Closing time
concentration in the combustion products shall not exceed 0.10 %.
c) Under the test conditions of 7.5.8.3 c), the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
0.20 %.
d) Under the test conditions of 7.5.8.3 d), at thermal equilibrium, the COα-1
concentration in the combustion products shall not exceed 0.10 %.
6.5.8.4 Gas/air ratio controls
6.5.8.4.1 Endurance of gas/air ratio controls
Under the test conditions of 7.5.8.4.1, gas/air ratio controls are subjected to an
endurance test of 250000 cycles with full diaphragm travel in each cycle. After
the endurance test, the gas/air ratio control shall operate correctly.
6.5.8.4.2 Leakage of non-metallic control tubes
Under the test conditions of 7.5.8.4.2, use control tubes that are not made of
metal or of other materials with at least equivalent properties, their breakage or
leakage shall not lead to an unsafe situation.
6.5.8.4.3 Adjustability of air/gas or gas/air ratio controllers
Under the test condition of 7.5.8.4.3, the adjustable device shall work normally
under the extreme pressure and within the adjustable ratio range.
6.5.8.4.4 Safety of operation
The appliance shall meet one of the following requirements.
a) Under the test conditions of 7.5.8.4.4 a), it shall meet the following
requirements.
1) when the heat input is higher than the maximum value of the adjustment
range specified by the manufacturer, the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
0.20 %;
2) When the heat input is below than the minimum value of the adjustment
range specified by the manufacturer, the gas supply shall be shut off
before the COα-1 concentration in the combustion products exceeds
థౣ ൈ CO୫ୣୱ ≤ 0.20 %.
where. Φ is the instantaneous heat input, Φmin is the minimum heat
input, COmes is the measured CO concentration.
a) Test 1. CLOSE the first valve of the gas circuit, OPEN all downstream
valves for soundness, APPLY air of 15 kPa to the gas inlet, CHECK
whether the requirement of 6.2.1 is met.
b) Test 2. OPEN the first valve of the gas circuit, CLOSE the second valve
for soundness of the gas circuit, BLOCK the ignition burner gas circuit.
APPLY air of 5 kPa (not using liquefied petroleum gas) or 15 kPa (using
liquefied petroleum gas) to the gas inlet. CHECK whether the requirement
of 6.2.1 is met. All the closing devices of the ignition burner are subjected
to the same test.
c) Test 3. OPEN the first valve of the gas circuit, CLOSE the second valve of
the gas circuit, CLOSE or BLOCK the ignition burner gas circuit. The
pressure of the gas inlet is 0.6 kPa. CHECK whether the requirement of
6.2.1 is met.
d) Test 4. OPEN all valves for soundness, REPLACE the injectors with the
appropriate parts provided by the manufacturer to block the gas circuit.
CHECK the leakage or CHECK whether the requirements of 6.2.1 is met
with 0-1 gas flame.
7.2.2 Soundness of combustion system
7.2.2.1 General
The test uses all the joints specified by the manufacturer under air at room
temperature. The tests are carried out with the maximum possible leakage of
the appliance.
7.2.2.2 Air supply and combustion products evacuation system
The body and the air supply and combustion products evacuation duct of the
appliance shall be tested separately, or the air supply and combustion products
evacuation duct shall be mounted on the appliance for overall test.
One end of the gas circuit of the test appliance is connected to the pressure
source and the other end is blocked. The test pressure shall be as specified by
the supplier but not less than 50 Pa. For appliances with fans and separate air
supply and combustion products evacuation ducts, the test pressure is the
pressure difference between the internal pressure of the combustion products
evacuation duct and the atmospheric pressure at thermal equilibrium of the
appliance (fitted with the longest air supply and combustion products
evacuation duct specified by the manufacturer). It is checked that the
requirements of 6.2.2.2 are met.
7.2.2.3 Combustion products evacuation duct for indirect control method
According to the test method of 7.3.1. MEASURE the total heat input during the
ignition safety time, CALCULATE the heat input per unit time. It is checked that
the requirements of 6.3.3 are met.
7.3.4 Heating rated heat output
The thermal efficiency of the test method in 7.7.1 is multiplied by the rated heat
input as the heating heat output. It is checked that the requirements of 6.3.4
are met.
7.3.5 Hot water rated heat input
USE 0-2 gas. For rapid heat exchange appliances, the gas rate can be adjusted
according to the manufacturer's instructions. When the rated hot water heat
input is in equilibrium state, the gas rate is measured and calculated according
to formulae (1) and (2). It is checked that the requirements of 6.3.5 are met.
7.3.6 Hot water production rate
USE 0-2 gas. ADJUST the temperature of hot water to 30 K ± 1 K. When it
cannot be adjusted to this temperature, adjust it to the nearest temperature.
The appliance with automatic thermostatic function shall set the temperature at
the maximum temperature; by means of increasing the inlet water pressure,
make the appliance operate at rated heat input or maximum heat input. When
the rated hot water heat input is in equilibrium state, the test is started. For
volumetric appliances, make the appliance operate in hot water mode, adjust
the thermostat to the temperature of 65 °C or the nearest temperature. When it
cannot be adjusted to this temperature, adjust it to the nearest temperature.
When the burner is extinguished, start draining the water, and the end of the
first drainage cannot be earlier than the second extinction of the burner and
shall last for 10 min. The test shall be conducted twice in a row. Record cold,
hot water temperature and water rate. After the appliance is operating for 20
min, a second 10-min water drainage is performed, and the temperature and
water rate are recorded. Calculate each drainage according to formula (3).
where.
Di - the value of the effective rate at a temperature rise of 30 K per
measurement, in liters per minute (L/min);
Mi(10) - the value of the amount of water measured each time during the test,
in liters (L);
Figure 7 -- Test rig with horizontal duct installed on a vertical wall
7.4.2.3 Ignition stability of ignition burner at low rate
Use reference gas for test.
a) For appliances without a governor or with a gas/air ratio control, the gas
inlet is set to the minimum pressure.
b) For appliances equipped with a governor, the outlet pressure is adjusted
to.
- Artificial gas. the corresponding value of 90 % of the rated heat input;
- Natural gas. the corresponding value of 92.5 % of the rated heat input;
- Liquefied petroleum gas. the corresponding value of 95 % of the rated
heat input.
Reduce the gas rate of the ignition burner to the minimum gas rate that
maintains its normal operation. It is check that the requirements of 6.4.2.3 are
met.
If ignition is possible under the above conditions, the test is repeated with the
minimum heat input allowed by the controller.
7.4.3 Reduction of gas pressure
With the boiler installed as stated in 7.1.3, the gas supply pressure is reduced,
in 100 Pa steps, from 70 % of the rated pressure to 0 mbar. At each step it is
checked that the requirements of 6.4.3 are met or that at least safety shutdown
occurs.
7.4.4 Failure of the gas shut-off valve near the main burner
If the gas supply to the ignition burner is taken between the two automatic
valves of the main burner, the gas shut-off valve near the main burner is kept
open artificially. Use 0-2 gas or the actual gas at the rated pressure to ignite the
small fire burner. It is checked that the requirements of 6.4.4 are met.
7.4.5 Pre-purge
7.4.5.1 Pre-purge volume and pre-purge time
According to the option chosen by the manufacturer, the pre-purge volume or
the pre-purge time are tested according to the following methods.
The composition and sealing force requirements of automatic gas valves are
given in Annex D.
7.5.3.1 Sealing force
The valves are first opened and closed twice. After turning off the power, apply
air under the press......
......
| Standard ID | GB 25034-2020 (GB25034-2020) | | Description (Translated English) | Gas-fired heating and hot water combi-boiler | | Sector / Industry | National Standard | | Classification of Chinese Standard | P45 | | Classification of International Standard | 91.140 | | Word Count Estimation | 102,171 | | Date of Issue | 2020-10-11 | | Date of Implementation | 2021-11-01 | | Older Standard (superseded by this standard) | GB 25034-2010 | | Administrative Organization | Ministry of Housing and Urban-Rural Development of the People's Republic of China | | Regulation (derived from) | National Standard Announcement No. 21 of 2020 | | Proposing organization | Ministry of Housing and Urban-Rural Development of the People's Republic of China | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
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