GB 14249-2026 Safety requirements for electronic weighing instrument English, Anglais, Englisch, Inglés, えいご
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ICS
CCS
National Standard of the People's Republic of China
GB 14249-2026
Safety requirements for electronic weighing instrument
电子衡器安全要求
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
3.1 Weighing Instrument Categories
3.2 Components and Accessories
3.3 Safety
3.4 Insulation
4 Protection against Electric Shock
4.1 General Requirements
4.2 Determination of Accessible Parts
4.3 Permissible Limits for Accessible Parts
4.4 Protection under Normal Conditions
4.5 Protection under Single Fault Condition
4.6 Connection to External Circuits
4.7 Clearances and Creepage Distances
4.8 Dielectric Strength Test Procedure
4.9 Constructional Requirements for Protection against Electric Shock
4.10 Connection to the Mains Supply and Connection between Weighing Instrument Components
4.11 Disconnection from the Supply Mains
5 Protection against Mechanical Hazards
5.1 General Requirements
5.2 Moving Parts
5.3 Stability
5.4 Lifting and Carrying Devices
5.5 Flying Parts
5.6 Resistance to Mechanical Impact
6 Prevention of Flame Spread
6.1 General Requirements
6.2 Elimination or Reduction of Ignition Sources within the Weighing Instrument
6.3 Containment of Flame within the Weighing Instrument
6.4 Limited Energy Circuits
6.5 Overcurrent Protection
7 Temperature Limits and Heat Resistance
7.1 Surface Temperature Limits for Protection against Burns (not applicable to weighing instruments specially designed for high temperature applications)
7.2 Winding Temperatures
7.3 Measurement of Other Temperatures
7.4 Conduct of Temperature Tests
7.5 Heat Resistance
8 Electromagnetic Immunity
8.1 General Requirements
8.2 Condition of the Weighing Instrument under Test
8.3 Test Items and Requirements
9 Components
9.1 General Requirements
9.2 Motors
9.3 Over-temperature Protection Devices
9.4 Fuse Holders
9.5 Mains Transformers Tested Outside the Weighing Instrument
9.6 Printed Wiring Boards
9.7 Batteries
10 Protection by Interlocks
10.1 General Requirements
10.2 Prevention of Restarting
10.3 Reliability
11 Tests
11.1 General Requirements
11.2 Test Sequence
11.3 Reference Test Conditions
11.4 Tests under Single Fault Conditions
11.5 Electromagnetic Immunity Performance Test
12 Marking and Documentation
12.1 General Markings
12.2 Warning Markings
12.3 Durability of Markings
12.4 Documentation
Bibliography
Figure 1 Detachable power supply cord and connection
Figure 2 Flowchart illustrating requirements for prevention of flame spread
Table 1 Tightening torques for screw assemblies
Table 2 Clearances and creepage distances for mains supply circuits
Table 3 Clearances for circuits supplied by the mains supply
Table 4 Creepage distances related to working voltage
Table 5 Test voltages for basic insulation
Table 6 Physical tests for power supply cords
Table 7 Permitted openings in the bottom of an enclosure
Table 8 Limits of maximum obtainable current values
Table 9 Overcurrent protection devices
Table 10 Surface temperature limits under normal conditions
Table 11 Insulation materials for windings
Table 12 Symbols
Electronic weighing instrument — Safety requirements
1 Scope
This document specifies the technical requirements for electronic weighing instruments, including protection against electric shock, protection against mechanical hazards, prevention of flame spread, temperature limits and heat resistance, electromagnetic immunity, components, protection by interlocks, and marking and documentation, and describes the corresponding test methods for non-automatic weighing instruments and various types of automatic weighing instruments.
This document applies to weighing instruments that use load cells as force-to-electricity conversion components, electronic weighing indicators for weight indication, and various types of associated electrical control boxes to achieve weighing or automatic control functions for the load being weighed, with electrical safety adopting Class I and Class II safety modes.
This document does not apply to weighing instruments used in explosive atmospheres or in high temperature environments (temperature ≥ 70 °C).
2 Normative References
The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 4208 Degrees of protection provided by enclosure (IP code)
GB/T 4776-2017 Electrical safety terminology
GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use — Part 1: General requirements
GB/T 5013.1 Rubber insulated cables of rated voltages up to and including 450/750 V — Part 1: General requirements
GB/T 5023.1 Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V — Part 1: General requirements
GB/T 7721 Continuous totalizing automatic weighing instrument (belt weigher)
GB/T 9969 General principles for preparation of instructions for use of industrial products
GB/T 11020 List of test methods for flammability of solid non metallic materials when exposed to a flame source
GB/T 11021 Electrical insulation — Thermal evaluation and designation
GB/T 11885 Automatic rail weighing instrument
GB/T 11918.1-2025 Plugs, fixed or mobile sockets and appliance inlets for industrial purposes — Part 1: General requirements
GB/T 11918.2 Plugs, fixed or mobile sockets and appliance inlets for industrial purposes — Part 2: Dimensional compatibility requirements for accessory with pins and sleeves
GB/T 14048.1 Low voltage switchgear and controlgear — Part 1: General rules
GB/T 14048.3 Low voltage switchgear and controlgear — Part 3: Switches, disconnectors, switch disconnectors and fuse combination units
GB/T 14250-2008 Weighing instrument terminology
GB/T 15934 Electrical accessories — Cord sets and interconnection cord sets
GB/T 16927.1 High voltage test techniques — Part 1: General definitions and test requirements
GB/T 17465.1 Couplers for household and similar general purposes — Part 1: General requirements
GB/T 17626.2 Electromagnetic compatibility — Testing and measurement techniques — Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility — Testing and measurement techniques — Part 3: Radiated, radio frequency, electromagnetic field immunity test
GB/T 17626.4 Electromagnetic compatibility — Testing and measurement techniques — Electrical fast transient/burst immunity test
GB/T 17626.5 Electromagnetic compatibility — Testing and measurement techniques — Surge (impact) immunity test
GB/T 17626.6 Electromagnetic compatibility — Testing and measurement techniques — Immunity to conducted disturbances induced by radio frequency fields
GB/T 17626.11 Electromagnetic compatibility — Testing and measurement techniques — Part 11: Voltage dips, short interruptions and voltage variations immunity tests for equipment with input current up to and including 16 A per phase
GB 19517-2023 National technical specification for safety of electrical equipment
GB/T 21296.1 Automatic instruments for weighing road vehicles in motion — Part 1: General technical specifications
GB/T 21473.2 Road vehicles — Test method for electrical/electronic components to electrical disturbances caused by conduction and coupling — Part 2: Electrical transient conduction along supply lines only
GB/T 21473.3 Road vehicles — Test method for electrical/electronic components to electrical disturbances caused by conduction and coupling — Part 3: Immunity to electrical transients coupled to non supply lines
GB/T 23111 Non automatic weighing instrument
GB/T 27738 Automatic gravimetric filling instrument
GB/T 27739 Automatic catch weighing instrument
GB/T 28013 Discontinuous totalizing automatic weighing instrument
GB/T 30174-2025 Mechanical safety — Terminology
QB/T 2065-2023 Electronic personal weighing scale
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 4776, GB 4793.1-2007, GB/T 14250-2008, GB/T 30174-2025 and the following apply.
3.1 Weighing instrument categories
3.1.1 electronic weighing instrument
A weighing instrument equipped with electronic devices.
[SOURCE: GB/T 14250-2008, 3.3.3]
3.1.2 non automatic weighing instrument
A weighing instrument that requires operator intervention during the weighing process to determine whether the weighing result is acceptable.
[SOURCE: GB/T 14250-2008, 3.3.4]
3.1.3 automatic weighing instrument
A weighing instrument that does not require operator intervention during the weighing process and can operate automatically according to a predetermined processing procedure.
[SOURCE: GB/T 14250-2008, 3.3.5]
3.1.4 continuous totalizing automatic weighing instrument (belt weigher)
An automatic weighing instrument that continuously weighs bulk material on a conveyor belt without the need to subdivide the material or interrupt the movement of the conveyor belt.
[SOURCE: GB/T 14250-2008, 3.3.5.1]
3.1.5 discontinuous totalizing automatic weighing instrument (totalizing hopper weigher)
An automatic weighing instrument that divides a batch of bulk material into discrete loads, weighs each discrete load in sequence, totalizes the weighing results, and discharges the discrete loads.
[SOURCE: GB/T 14250-2008, 3.3.5.14]
3.1.6 automatic catch weighing instrument
An automatic weighing instrument that weighs pre packaged discrete loads or single loads of bulk items.
[SOURCE: GB/T 14250-2008, 3.3.5.15]
3.1.7 automatic gravimetric filling instrument
An automatic weighing instrument that divides bulk material into predetermined and substantially constant masses of fill and discharges these fills into containers. It consists essentially of an automatic feeding device associated with a weighing unit and corresponding control and discharge devices.
