National Standards in Chinese is 国标 Guobiao so they are commonly referred to as “GB standards”. The standards are developed for technical requirements by the Standardization Administration of China (SAC), the Chinese National Committee of the ISO and IEC, and are uniformly applicable across all of China. Chinese national GB standards can be identified as mandatory or voluntary by their postfix code:
GB Mandatory National Standards
GB/T Recommended National Standards (T from 推荐 tuījiàn, recommended")
GB/Z Voluntary National Standards
GB standards form the basis for the product testing requirements which products must undergo during the China Compulsory Certificate (CCC) certification. If there is no corresponding GB Standard, CCC certification is not required.
The automobile model itself as well as the various individual components are subject to certification. An overall vehicle certification without specific certification of individual components allows for a certain range of parts to be included, but can lead to difficulties later if changes are made to the components or suppliers.
The CNCA is responsible for the implementation of the compulsory product certification system and designating the organizations that issue CCC certification marks. The CNCA has designated two primary government agencies to issue CCC certification for motor vehicles and automotive components: China Center for Automotive Products (CCAP) and China Quality Certification Center (CQC)
Professional Standards are also referred to as “Industry Standards”. They are developed and applied when no National GB Standard exists, but where a unified technical requirement is needed for a specific industry sector in China. Professional standards are coded by industry sector with the code for the Automobile sector being QC. Voluntary standards have "/T" added so the code for voluntary automotive standards is "QC/T".