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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
Electrical relays—Part 15:Endurance tests for electrical relay contacts—Specification for the characteristics of test equipment
WITHDRAWN published on 5.9.1993
Selected format:Electrical relays—Part 3:Single input energizing quantity measuring relays with dependent or independent time
WITHDRAWN published on 2.6.1995
Selected format:Electrical relays—Part 20:Protection (protective)systems
WITHDRAWN published on 24.7.1995
Selected format:Electrical relays - Part 20: Protection systems
WITHDRAWN published on 18.6.2008
Selected format:Electrical relays. Part 22: Electrical disturbance tests for measuring relays and protection equipment. Section three--Radiated electromagnetic field disturbance tests
WITHDRAWN published on 24.7.1995
Selected format:Electrical relays—Part 22-3:Electrical disturbance tests for measuring relays and protection equipment—Radiated electromagnetic field disturbance tests
WITHDRAWN published on 8.10.2002
Selected format:Measuring relays and protection equipment—Part 22-3:Electrical disturbance tests—Radiated electromagnetic field immunity
WITHDRAWN published on 10.11.2010
Selected format:High purity oxygen
WITHDRAWN published on 26.8.1993
Selected format:Pure oxygen and high purity oxygen and ultra pure oxygen
WITHDRAWN published on 15.5.2008
Selected format:Technical code for application of fly ash concrete
WITHDRAWN published on 1.1.1990
Selected format:Latest update: 2026-06-10 (Number of items: 2 281 585)
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