SOCIALIST REPUBLIC OF VIETNAM  
 
 
QCVN XX -ZZ: 2023/BNNPTNT  
 
 
 
 
 
 
 
 
 
NATIONAL TECHNICAL REGULATIONS  
ABOUT SAFETY FOR HAND MOWERS  
USED IN AGRICULTURE AND FORESTRY  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
HA NOI – 2023 
3rd DRAFT  QCVN  XX-ZZ: 2023/BNNPTNT  
2 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 QCVN  XX-ZZ: 2023 /BNNPTNT  
 3 TABLE OF CONTENTS  
First words  ................................ ................................ ..................  Error! Bookmark not defined.  
1. GENERAL RULES  ................................ ................................ ................................ .................  5 
1.1.  Scope  ................................ ................................ ................................ ................................ . 5 
1.2.  Applicable subjects  ................................ ................................ ................................ ............  5 
1.3.  Explanation of words  ................................ ................................ ................................ ..........  5 
2.  TECHNICAL REGULATIONS  ................................ ................................ ...............................  5 
2.1. General requirements  ................................ ................................ ................................ .........  6 
2.2. Vibrate  ................................ ................................ ................................ ................................  6 
2.3. Noise level  ................................ ................................ ................................ ..........................  6 
2.4. Clutch  ................................ ................................ ................................ ................................ .. 6 
2.5. Engine stopping mechanism  ................................ ................................ ...............................  6 
2.6. Cover the cutting part  ................................ ................................ ................................ ..........  6 
2.7.  Protect against contact with hot parts  ................................ ................................ ................  7 
2.8. Impact  ................................ ................................ ................................ ................................ . 7 
2.9. Safety symbol  ................................ ................................ ................................ .....................  7 
3. REGULATIONS ON MANAGEMENT  ................................ ................................ ....................  7 
3.1. Specifies the method of assessing conformity  ................................ ................................ .... 7 
3.2.  Regulations on declaration of conformity  ................................ ................................ ...........  7 
3.3. Methods of inspection and testing ................................ ................................ .......................  7 
3.4. Labeling regulations  ................................ ................................ ................................ ............  8 
3.5. Sampling method  ................................ ................................ ................................ ................  8 
4.  RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS ................................ .........  8 
4.1. Corporate responsibility  ................................ ................................ ................................ ...... 9 
4.2. Responsibilities of the regulation conformity certification organization  ...............................  9 
5.  IMPLEMENTATION ORGANIZATION  ................................ ................................ ..................  9 
APPENDIX 1 General Regulations (Regulations)  .......................  Error! Bookmark not defined.  
APPENDIX 2 Vibration measurement (Regulations)  ..................  Error! Bookmark not defined.  
APPENDIX 3 A -weighted sound pressure level emitt ed at the operator's position (Regulations)
 ................................ ................................ ................................ .... Error! Bookmark not defined.  
APPENDIX 4 Impact Test (Regulations)  ................................ ..... Error! Bookmark not defined.  
 
  QCVN  XX-ZZ: 2023/BNNPTNT  
4 
  
 
 
 
 
First word  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
QCVN XX -ZZ: 2023/BNNPTNT compiled by Machine and Equipment 
Inspection Center - Institute of Agricultural Electromechanics and Post -
harvest Technology; Department of Science, Technology and 
Environment for approval; The Ministry of Science and Technology 
appraised, the Minister of Agriculture and Rural Development issued 
according to Circular No. ...... /........../TT -BNNPTNT da y/month/year . 
 QCVN  XX-ZZ: 2023 /BNNPTNT  
 5 NATIONAL TECHNICAL REGULATIONS ON SAFETY  
FOR HANDHELD GRASS MOWERS USED IN AGRICULTURE AND FORESTRY  
 
 
1. GENERAL RULES  
 
1.1.  Scope   
This regulation stipulates technical requirements and management requirements to ensure 
safety for hand -held lawn mowers used in agriculture and forestry (HS Code 84332000).  
This regulation does not apply to hand -held lawn mowers imported or domestically produced 
before the effective date of this regulation.  
1.2.  Applicable subjects  
This regulation applies to organiz ations and individuals that produce, import, distribute and 
trade hand -held lawn mowers used in agriculture and forestry (hereinafter referred to as 
enterprises). State management agencies and other relevant organizations and individuals.  
1.3.  Explanation  of words  
1.3.1. Batch to goods  
Including hand -held lawn mowers with the same name, use, brand, type, technical 
characteristics of the same production facility, origin and same import records.  
1.3.2. Handheld lawn mower  
The machine includes a shoulder -mounted power unit, drive shaft, cutting and shielding parts. 
The machine is used to cut weeds, bushes, small trees and similar plants.  
1.3.2.1 . Bush cutter  
A bush mower is a hand -held lawn mower in which the cutting part is a metal or non -metal 
rotary cutter.  
1.3.2.2 . Lawn  mower  
A lawn mower is a hand -held lawn mower in which the cutting part is a soft, elastic or 
malleable, plastic cord.  
1.3.2.3. Bush saw  
A bush saw is a hand -held lawn mower in which the cutting part is a serrated cutting disc.  
1.3.2 .4. Grass edge trimmer  
A lawn trimmer is a hand -held lawn mower in which the cutting part is a blade that operates in 
a plane perpendicular to the ground.  
1.4. Test conditions and results evaluation  
Conditions when testing technical regulations and ev aluating test results are as 
prescribed in Appendix 1.  
 
 
2.  TECHNICAL REGULATIONS  
 QCVN  XX-ZZ: 2023/BNNPTNT  
6 
 2.1. General requirements  
- The machine must have all parts, structures, and operational details according to function; No 
abnormalities were detected when operating the machine in test modes according to the 
provisions of this Technical Regulation.  
- There is no fluid leakage at joints or connections.  
- Machine parts and details are not cracked, broken, punctured, torn or deformed.  
2.2. Vibrate  
The measured vibration value at each handle is not greater than the level specified in Table 1.  
Table 1 - Achieved vibration (ahv,ed)  values  
Vibration (ahv,ed) Engine combustion chamber 
capacity , cm3 
≤ 35  > 35 
Vibration 
acceleration , m/s2 15 7,5 
Test method according to Appendix 2.  
2.3. Noise level  
Noise level is determined by the sound pressure level emitted not greater than the level 
specified in Table 2.   
Table 2 - Acquired negative pressure values  
Negative pressure 
is achieved  Engine combustion chamber 
capacity , cm3 
≤ 35  > 35 
Negative pressure , 
dB(A) 102 105 
Test method according to Appendix 3.  
2.4. Clutch  
The machine must have a clutch to ensure that power is not transmitted to the cutting part 
when the engine rotates at a speed less than or equal to 1.25 times the engine's lowest idling 
speed (speed without any impact on the engine). throttle valve control structure to adjust 
engine speed).  
2.5. Engine stopping mechanism  
The machine must be equipped with a mechanism that can completely stop the motor without 
maintaining control action.  
2.6. Cover the cutting part  
- Shielding for cutting parts must meet the minimum dimensions specified in TCVN 
10877: 2015.  QCVN  XX-ZZ: 2023 /BNNPTNT  
 7 - The durability of the cutting part guard must comply with TCVN 8747: 2011.  
2.7.  Protect against contact  with hot parts  
- The hot part of a handheld lawn mower must meet the requirements specified in 4.17 in 
TCVN 8746:2011.  
2.8. Impact  
- The lawn mower's engine must be turned off immediately after impact.  
- The cutting part with soft cutting wire must not be  cut or broken.  
- The cutting part must be in solid condition.  
- After impact test, the length of flexible cutting wire must be (25 ±12) mm.  
Test method according to Appendix 4.  
2.9. Safety symbol  
2.9.1 . Safety signs must comply with regulations and must be properly attached to the machine 
to warn users and people around them of the risk of bodily injury during operation, care and 
maintenance. nourishment.  
2.9.2. Safety symbols must be provided on the mach ine at appropriate locations to prevent 
hazards: avoid contact with hot parts, impact and splashing.  
2.9.3.  Safety regulations must comply with the regulations in TCVN 8092:2021 (ISO 
7010:2019) Graphic symbols – Safety colors and safety signs – Registered safety signs.  
 
3. REGULATIONS ON MANAGEMENT  
 
3.1.  Specifies the method of assessing conformity  
3.1.1. Hand -held lawn mowers used in agriculture and forestry that are new and unused, 
manufactured or assembled domestically or imported must be certified according to method 5 
(testing typical samples combined with process assessment). production; monitoring through 
testing samples taken at the production site or on the market combined with assessment of the 
production process) or according to method 7 (tes ting and evaluating batches of products and 
goods) specified in Appendix 2 issued together with Circular No. 28/2012/TT -BKHCN December 
12, 2012 of the Minister of Science and Technology.  
3.1.2. For imported used hand -held lawn mowers, all products and good s must be inspected 
according to method 8 specified in Appendix 2 issued with Circular No. 28/2012/TT -BKHCN 
December 12. /December 2012 of the Minister of Science and Technology.  
3.2.  Regulations on declaration of conformity  
3.2.1. The declaration of conformity to regulations is made on the basis of the results of 
conformity assessment by certification organizations, inspection organizations, and testing 
laboratories that have registered to operate, are designated or recognized.  
3.2.2. Certification of  conformity by a designated certification organization or a foreign 
certification organization is mutually recognized for the results of conformity assessment.  
3.3. Methods of inspection and testing  
Handheld lawn mowers manufactured, assembled and imported  must be inspected and 
tested according to:  QCVN  XX-ZZ: 2023/BNNPTNT  
8 
 - ISO 22867:2021  Forestry and gardening machinery . Vibration test code for portable 
hand -held machines with internal combustion engine . Vibration at the handles ;  
- ISO 22868:2021 Forestry and gardening machinery . Noise test code for portable hand -
held machines with internal combustion engine . Engineering method (Grade 2 accuracy) ;  
- TCVN 8746:2011  Agricultural and forestry machines - Handheld brush cutters and grass 
trimmers driven by internal combustion engines  - Safety ;  
- ISO 11806 -1:2022 Agricultural and forestry machinery – Safety and testing 
requirements for hand -held brush cutters and grass trimmers – Part 1: Machines using internal 
combustion engines . 
3.4. Labeling regulations  
3.4.1. Request  
- Handheld lawn mowers must have a label attached to the machine in a prominent position, 
easy to read, indelible and not blurred or damaged by fuel, grease, friction, temperature and 
humidity. school.  
- The label must be clearly written in Vietnamese and must have a n additional label for 
imported handheld lawn mowers.  
3.4.2. Labeling  
The label must have the following minimum information:  
- Name of handheld lawn mower;  
- Manufacturer's name and address;  
- Year of manufacture;  
- Handheld lawn mower symbol or type;  
- Production series number, if any;  
- Dry mass of complete handheld lawn mower, in kg;  
3.5. Sampling method  
The number of test samples depends on the number of machines in a shipment and is 
specified in Table 3.  
Table 3 – Number of test samples  
TT Number of machines in the shipment  
(pcs)  Number of test samples  
(pcs)  
1 From  1 to 100 03 
2 Over  100 to 500 06 
3 Over  500 10 
 
4.  RESPONSIBILITIES OF ORGANIZATIONS AND INDIVIDUALS  
 QCVN  XX-ZZ: 2023 /BNNPTNT  
 9 4.1. Corporate responsibility  
4.1.1. Enterprises manufacturing, importing, distributing and trading hand -held lawn mowers 
must ensure the technical regulations in section 2 and implement the management regulations 
in section 3 of this Technical Regulation.  
4.1.2. Before putting hand -held lawn mowers into circulation on the market , businesses must 
be responsible for affixing the conformity mark to hand -held lawn mowers that have been 
certified as conformable according to the provisions of this Technical Regulation.  
4.2. Responsibilities of the regulation conformity certification or ganization  
Regulation conformity certification organizations must carry out the responsibilities specified in 
Decree No. 107/2016/ND -CP. 
 
5.  IMPLEMENTATION ORGANIZATION  
 
5.1. Department of cooperatives and rural development  is responsible for coordinating  with 
relevant authorities to guide and inspect the implementation of this Regulation.  
5.2. Based on management requirements , Department of cooperatives and rural development  
responsible for making recommendations The Ministry of Agriculture and Rural Development 
amends and supplements this Regulation.  
5.3. In case the documents cited in this regulation are replaced or amended or supplemented, 
the replaced or amended or supplemented documents shall apply./.  
 QCVN  XX-ZZ: 2023/BNNPTNT  
10 
 APPENDIX 1  
General rules  
(Regulations ) 
 
1. Test conditions  
Measuring and testing equipment must be periodically inspected and calibrated according to 
the provisions of the law on measurement.  
2. Evaluate the test  
The test is considered satisfactory when all test results are passed, when tested on a  hand -
held lawn mower sample of the batch of goods Table 3.QCVN  XX-ZZ: 2023 /BNNPTNT  
 11 APPENDIX 2  
Vibration measurement  
(Regulations ) 
 
1. Measurement conditions  
This test applies to all hand -held lawn mowers.  
- Measurements are performed on machines with fuel tanks at least half full. 
- The engine must be run -in before testing according to the manufacturer's recommendations. 
Engine temperature must be stable.  
- Set the carburetor mode according to the manufacturer's instructions.  
- The number of engine revolutions in all test mode s is kept constant within the range of ± 3.5 
rpm throughout the test; changes to the initial adjustments are not allowed. If adjustments are 
necessary, repeat the test after each adjustment.  
- The operator has an influence on the vibration value of the mac hine. Therefore, it is required 
that the operator must have skills and operate the machine properly.  
- The machine must be held by hand so that it does not come into contact with the operator's 
body during the test.  
- Each test mode requires a minimum of 4  measurements, varying the number of engine 
revolutions (between idle mode, full load mode and full speed mode) between measurements. 
A stable number of revolutions within ± 3.5 revolutions/sec must be achieved before the test is 
continued.  
- The total of 4 time intervals corresponding to 4 independent trials is 20 s.  
2. Instrumentation  
The measuring device is capable of measuring three directions x, y and z simultaneously.  
3. Measurement methods  
3.1. Measurement location and direction  
- Measurement location at each handle of the handheld lawn mower, while the operator holds 
the machine normally. Measurements are performed simultaneously in three directions x, y 
and z.  
- The center of gravity of the vibration probe must be located at the closest posit ion, a 
maximum of 20 mm from the edge of the handle.  
3.2. Measure and calculate  
- Measure vibration acceleration in three directions x, y and z is ahwx,J,  ahwy,J,  a hwz,J, at the left 
handle and right handle; in 3 operating modes (J) : idle mode (Id), full load mode (FI) and full 
speed mode (Ra).  
- Calculate the combined acceleration of the three directions x, y and z is ahvJ with each 
operating mode.  
- Repeat at least 4 times.  
- Calculate the average value of at least 4 trials , ahvJ. 

n
ihvJihvJ ana
11
 QCVN  XX-ZZ: 2023/BNNPTNT  
12 
 In there:  
n – number of attempts . 
- Calculate the equivalent total vibration value ahv,ed for each handle. The data are recorded in 
Table 4.   
- Calculate the standard deviation Sn-1 and the coefficient of variation Cv.  

 n
ihvJhvJi n a ans
12
1 ) (11
 
hvJn
vasC1
 
Table 4 – Measured vibration values in each mode and handle  
Operation 
mode  Measurement and 
calculation 
parameters  Number of 
operating 
engine 
revolutions, rpm  Handle  
Numerical measurement  
1 2 3 4 n 
 
Idle mode 
(Id) ahv,Id (m/s2)       
ahv,Id (m/s2)       
Sn-1 (m/s2)       
Cv       
 
 
Full load 
mode  ahv,Id (m/s2)       
ahv,Id (m/s2)       
Sn-1 (m/s2)       
Cv       
 
 
Full speed 
mode  ahv,Id (m/s2)       
ahv,Id (m/s2)       
Sn-1 (m/s2)       
Cv       
4. Number of measurement data 
Measurements are considered valid when:  
a) Variation coefficient Cv  0,3 or 
b) Standard deviation Sn-1  0,4 m/s2. 
- If Cv  0,15 or if Sn-1  0,3 m/s2 then must check for errors in measurements before 
accepting the measurement data.  
- If the measured values at each handle and operating mode do not satisfy condition a) or b), 
repeat the measurements and calculations until one of the two conditions is satisfied.  QCVN  XX-ZZ: 2023 /BNNPTNT  
 13 APPENDIX 3  
The A -weighted sound pressure level emitted at the operator's ear  
(Regulations ) 
 
1. Measurement conditions  
This test applies to all hand -held lawn mowers.  
- Environmental temperature conditions must be within the limits of ( -10÷30) 0C. Wind speed 
must be less than 5 m/s. There must be a windscreen for the mic when testing  outdoors. The 
wind speed when tested in the room must not exceed 1 m/s.  
- If testing outdoors, there should be a diagram of the machine's location with surrounding 
objects, including a description of the physical characteristics of the ground surface.  
- If testing in a room, there should be a diagram of the machine's location with surrounding 
objects, describing the physical characteristics of the walls, ceiling and floor.  
- The support frame material must satisfy the acoustic properties, avoiding compress ion of the 
absorbing material.  
- When using artificial substrate:  
+ The artificial ground surface must have a sound absorption coefficient (ISO 354:2003) in 
accordance with Table 5.  
Table 5 – Absorption coefficient  
Frequency , Hz The absorbance  Tolerance  
125 0,1  0,1 
250 0,3  0,1 
500 0,5  0,1 
1000  0,7  0,1 
2000  0,8  0,1 
4000  0,9  0,1 
+ The artificial base surface must be placed on a hard, reflective surface, in the center of the 
test area, with dimensions of at least 3.6 m x 3.6 m.  
- When using  natural substrate:  
+ The ground surface in the center of the test area must be flat and have good sound 
absorption properties. The surface must be grass or other organic material, with a height of 
(50±20) mm.  
- Measurements are performed on a normal machi ne, equipped in accordance with the user 
manual.  
- The engine must be run -in before testing according to the manufacturer's recommendations. 
Engine temperature must be stable.  
- Set the carburetor mode according to the manufacturer's instructions.  QCVN  XX-ZZ: 2023/BNNPTNT  
14 
 - The lawn mower must be lubricated according to the instructions in the user manual.  
2. Instrumentation  
- Sound pressure level measuring equipment with “slow” time -weighting characteristics as 
defined in TCVN 12527 -1:2018 must be used.  
- The device for measurin g the number of engine revolutions must have an accuracy of ± 1.0% 
of the reading value. This device does not affect operation during the test.  
3. Method for measuring sound pressure level  
a) Perform at least 4 measurements in each measurement mode (idle mode, full load mode 
and full speed mode). After changing the engine rpm, make sure the rpm is stable before 
continuing the test.  
- The sum of 4 measurement intervals corresponding to 4 measurements must be at least 20 
s. 
- The signal duration of each meas urement period must be at least 2 s, the number of 
oscillating motor revolutions is within ± 3.5 revolutions/second.  
- Measurement data corresponding to different operating modes of the machine do not 
necessarily need to be performed sequentially.  
b) The m easured value fluctuation for each measurement in operating mode does not exceed 
2 dB. If exceeded, the test shall be repeated until the result is within 2 dB. The final value is the 
average value of 4 measurements that satisfy the condition.  
4. Measuremen t data  
A pAX pAX K L L1'
 
In there : 
LpAX - A-weighted sound pressure level , dB; 
K1A - Adjustment coefficient , dB (ISO 11201);  
L’
pAX - Average value of measurements , dB.  
Table  6 – A-weighted sound pressure level  
Operation 
mode  Number of 
engine 
revolutions, 
rpm A-weighted sound 
pressure level , L’
pA, 
dB The 
average 
value , L’
pAX 
dB Adjustment 
coefficient , 
K1A 
dB A-
weighted 
sound 
pressure 
level , 
LpAX 
dB Phép đo số  
1 2 3 4 n 
Idle mode 
(Id)          
Full load 
mode (FI)          
Full speed 
mode (Ra)          QCVN  XX-ZZ: 2023 /BNNPTNT  
 15 APPENDIX 4  
Test for impact  
(Regulations ) 
 
1. Test conditions  
This test applies to lawn mowers only.  
- The machine must be hung freely in the operating position (Figure 1).  
- For machines using soft metal cutting wire, the cutting wire has the maximum length 
recommended by the manufacturer).  
- For machines using soft non -metallic cutting wire, the cutting wire must have a length of 
(51±13) mm from the exit position. The coil must be full according to the manufacturer's 
recom mendations.  
2. Impact testing equipment  
- Machine hanger.  
- 9S20 steel pipe has a diameter of (25 ±1) mm, fixedly installed vertically.  
 
a) The machine uses a rigid transmission  
QCVN  XX-ZZ: 2023/BNNPTNT  
16 
  
b) The machine uses soft transmission  
NOTES:  
1 Steel bar  
2 Direction of rotation  
3 Soft shafts  
4 Motivation cluster  
Figure  1 – Test for impact  
 
3. Impact test method  
- The number of rotations of the cutting part corresponds to the rated number of revolutions of 
the engine.  
- Impact testing is performed only once.  
- The cutting  part hits the steel pipe horizontally with an approaching speed of (1 ±0.1) m/s.  
- After impact, let the cutting unit continue to rotate for 5 minutes at a speed equal to 1.33 
times the rated number of revolutions.