Standards GB - Chinese national standards - Page 5749

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GB/T 12667-1990 WITHDRAWN

General specification for excitation assembly with semiconductor for synchronous motor

WITHDRAWN published on 29.12.1990

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GB/T 12668-1990 WITHDRAWN

General specification for speed control assembly with semiconductor adjustable frequency for A. C. motor

WITHDRAWN published on 1.1.1990

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GB 12668.3-2003 WITHDRAWN

Adjustable speed electrical power dive systems—Part 3:EMC product standard including specific test methods

WITHDRAWN published on 9.10.2003

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GB/T 12668.4-2006 WITHDRAWN

Adjustable speed electrical power drive systems - part 4: General requirements - Rating specifications for a.c. power drive systems above 1000V a.c. and not exceeding 35kV

WITHDRAWN published on 14.3.2006

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