GB/T 41349-2022 English PDF (GBT41349-2022)

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GB/T 41349-2022: Safety of machinery - Specification for emergency stop devices
GB/T 41349-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.110
CCS J 09
Safety of machinery - Specification for emergency stop
devices
ISSUED ON: MARCH 09, 2022
IMPLEMENTED ON: OCTOBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
Introduction ... 5 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 8 
4 Technical requirements ... 9 
4.1 General requirements ... 9 
4.2 Structural requirements ... 9 
4.3 Safety requirements ... 10 
4.4 Environmental adaptability ... 11 
4.5 Mechanical properties ... 11 
4.6 Electrical properties ... 11 
5 Tests ... 12 
5.1 Test for structural requirements ... 12 
5.2 Test for safety requirements ... 12 
5.3 Test for environmental adaptability ... 13 
5.4 Test for mechanical properties ... 13 
5.5 Test for electrical properties ... 14 
6 Information for use ... 15 
6.1 General requirements ... 15 
6.2 Enclosure identification ... 15 
6.3 Instructions for use ... 15 
Appendix A (Informative) Calculation or estimation of element’s B10 and B10D values
... 17 
Bibliography ... 20 
Safety of machinery - Specification for emergency stop
devices
1 Scope
This document specifies the technical requirements, tests, and information for use, etc.
of emergency stop devices that realize emergency stop function.
This document applies to emergency stop devices that trigger the emergency stop
function by pressing a button.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 2423.7 Environmental testing - Part 2: Test methods - Test Ec: Rough handling
shocks, primarily for equipment-type specimens
GB/T 2423.22 Environmental testing - Part 2: Test methods - Test N: Change of
temperature
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 14048.1-2012 Low-voltage switchgear and controlgear - Part 1: General rules
GB/T 14048.5-2017 Low-voltage switchgear and controlgear - Part 5-1: Control
circuit devices and switching element - Electromechanical control circuit devices
GB/T 14048.14-2019 Low-voltage switchgear and controlgear - Part 5-5: Control
circuit devices and switching elements - Electrical emergency stop device with
mechanical latching function
GB/T 15706-2012 Safety of machinery - General principles for design - Risk
assessment and risk reduction
GB/T 16754-2021 Safety of machinery - Emergency stop function - Principles for
design
3 Terms and definitions
The terms and definitions defined in GB/T 15706-2012 and GB/T 16754-2021 and the
following ones apply to this document.
3.1
Emergency stop
Emergency stop function
A function triggered by a single person action to prevent an ongoing or reduce an
existing danger to personnel, damage to machinery or work in progress.
[Source: GB/T 15706-2012, 3.40, modified]
3.2
Emergency stop device
The control device for artificially triggering the emergency stop function.
[Source: GB/T 16754-2021, 3.3]
3.3
Mean cycles to dangerous failure
B10D
The average number of cycles until 10% of the elements fail dangerously.
Note: The element can be a mechanical element, an electromechanical element, a pneumatic
element, or a hydraulic element.
3.4
Direct opening
The specified action of contact unit in which the contact separation is directly realized
by an inelastic part (e.g., no spring is used).
[Source: GB/T 14048.5-2017, K.2.2, modified]
3.5
Force of direct opening
4.3.6 Prevent accidental triggering
To prevent accidental triggering, a protective ring can be added. The structure of the
protective ring shall not cause damage to the hand that triggers the emergency stop
function; nor shall it weaken the triggering ability of emergency stop function.
4.4 Environmental adaptability
The parts, devices, and elements of emergency stop device shall be selected, assembled,
connected and guarded so that they can operate correctly under the expected operating
conditions and environmental influences.
The emergency stop device shall be able to work normally under the following
conditions:
- Temperature: -10 ℃~55 ℃;
- When the maximum temperature is 40 °C, the relative humidity of air does not
exceed 50%. A higher relative humidity can be allowed at lower temperatures, such
as 90% at 20 °C. Special measures shall be taken for occasional condensation due
to temperature changes.
4.5 Mechanical properties
During the intended use, the emergency stop device shall have sufficient anti-vibration,
anti-shock and anti-drop properties, to prevent the loss of safety functions due to
vibration, shock and drop.
4.6 Electrical properties
4.6.1 Withstand voltage
After the emergency stop device is subjected to the withstand voltage test according to
8.3.3.4 in GB/T 14048.1-2012, there shall be no breakdown and no arcing.
4.6.2 Clearance and creepage distance
Pollution degree 3.
The minimum value of clearance and creepage distance shall meet the requirements
given in Table 13 and Table 15 in GB/T 14048.1-2012.
4.6.3 Degree of protection provided by enclosure
The degree of protection provided by enclosure of emergency stop device shall be at
least IP65.
5 Tests
5.1 Test for structural requirements
Check the electrical symbol identification and structural schematic diagram. The
structure shall meet the requirements of 4.2.
5.2 Test for safety requirements
5.2.1 Force and stroke of direct opening
Apply force along the axial direction of the button, until the contact of emergency stop
device is disconnected. Record the force value at this time (force of direct opening) and
the displacement of the button (stroke of direct opening). Continue to apply force, to
verify whether the further displacement of the button is not less than 0.5 mm.
The force of direct opening shall meet the requirements of 4.3.1.
5.2.2 Mean cycles to dangerous failure (B10D)
Randomly select no less than 10 test objects. According to the requirements of
Appendix C in GB/T 14048.5-2017, do the durability test, until 10% of the test objects
fail. The number of cycles at this time is B10. The calculation of B10 value is shown in
Appendix A.
The B10D value can be determined in the following ways:
a) Assume the rate of dangerous failure is 50%. Then the B10 value can be doubled
to get the B10D value: B10D=2B10;
b) By analyzing objects that fail the test and determining the percentage of
potentially dangerous failure, determine the B10D value.
The B10D value shall meet the requirements of 4.3.2.
5.2.3 Mechanical latching function
Test and verify in accordance with 7.5, 7.6, 7.7 in GB/T 14048.14-2019. The
mechanical latching function shall meet the requirements of 4.3.3.
5.2.4 Contact unit
According to 7.5 and 7.6 in GB/T 14048.14-2019, carry out the shock test and vibration
test, respectively.
Visually observe whether the contact unit comes off.
The testing device shall be able to detect any opening or closing of contact greater than
0.2 ms.
5.4.2 Shock test
The eme...