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This also depends on whether it is on-site equipment testing or product testing. If the detection of equipment used in hazardous areas is based onAQ3009-2007According to the Electrical Safety and Explosion Protection Regulations for Hazardous Areas, the testing cycle shall not exceed3Year. If it is product testing, it mainly followsGB3836Series standards. As a professional agency for explosion-proof testing and certification, Zhongnuo Testing can provide regular testing and on-site construction renovation of hazardous equipment, as well as explosion-proof certification and coal safety certification services for products. Welcome to inquire!