Standard No.:	GB 14249-2026
English Name:	Safety requirements for electronic weighing instrument
Chinese Name:	电子衡器安全要求
Chinese Classification:	N13    Mechanical quantity instrument, automatic weighing equipment and other measuring instrument
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR;SAC
Issued on:	2026-01-28
Implemented on:	2027-8-1
Status:	to be valid
Superseding:	GB 14249.1-1993 requirements for electronic weighing instruments
Target Language:	English
File Format:	PDF
Word Count:	24500 words
Translation Price(USD):	735.0
Delivery:	via email in 1~8 business day

GB 14249-2026 Safety requirements for electronic weighing instrument English, Anglais, Englisch, Inglés, えいご This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered. 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 nonmetallic 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 Lowvoltage switchgear and controlgear — Part 1: General rules GB/T 14048.3 Lowvoltage switchgear and controlgear — Part 3: Switches, disconnectors, switchdisconnectors and fusecombination units GB/T 14250-2008 Weighing instrument terminology GB/T 15934 Electrical accessories — Cord sets and interconnection cord sets GB/T 16927.1 Highvoltage 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, radiofrequency, 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 radiofrequency 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 nonsupply lines GB/T 23111 Nonautomatic 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 nonautomatic 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 prepackaged 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.