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Standards GB - Chinese national standards - Page 538
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
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GB/T 15540-2006
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EMC specification and test methods for land mobile communication equipment
Standard published on 25.7.2006
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GB/T 15541-1995
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Methods of measurement for transmitting frequency
Standard published on 6.4.1995
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GB/T 15542-1995
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Technical requirements of digital SPC automatic telephone exchange
Standard published on 6.4.1995
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GB/T 15543-2008
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Power quality - Three-phase voltage unbalance
Standard published on 18.6.2008
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GB/T 15544.1-2023
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Short-circuit current calculation in three-phase a.c. systems—Part 1: Calculation of currents
Standard published on 17.3.2023
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GB/T 15544.2-2017
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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
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GB/T 15544.3-2017
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Short-circuit current calculation in three-phase a.c.systems—Part 3:Data of electrical equipment
Standard published on 29.12.2017
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GB/T 15544.4-2017
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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
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GB/T 15544.5-2017
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Short-circuit current calculation in three-phase a.c.systems—Part 5: Examples
Standard published on 29.12.2017
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GB/T 15545-2020
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General rules for packing, marking, transport, storage and quality certificates of unshaped refractory
Standard published on 2.6.2020
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