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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Short-circuit current calculation in three-phase a.c. systems—Part 1: Calculation of currents
Standard published on 17.3.2023
Selected format:Short-circuit current calculation in three-phase a.c. systems—Part 2: Factors for the calculation of short-circuit currents
Standard published on 29.12.2017
Selected format:Short-circuit current calculation in three-phase a.c.systems—Part 3:Data of electrical equipment
Standard published on 29.12.2017
Selected format:Short-circuit current calculation in three-phase a.c.systems—Part 4: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
Standard published on 29.12.2017
Selected format:Short-circuit current calculation in three-phase a.c.systems—Part 5: Examples
Standard published on 29.12.2017
Selected format:General rules for packing, marking, transport, storage and quality certificates of unshaped refractory
Standard published on 2.6.2020
Selected format:Terms of mill rolls
Standard published on 12.10.2022
Selected format:Blanks of forged steel rolls for cold rolling mill
Standard published on 31.10.2025
Selected format:General specification for three-phase synchronous generators driven by reciprocating internal combustion engine
Standard published on 27.11.2023
Selected format:Sensory analysis—Methodology— Initiation and training of assessors in the detection and recognition of odours
Standard published on 12.10.2022
Selected format:Latest update: 2026-06-12 (Number of items: 2 281 969)
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