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This also depends on whether it is on-site equipment testing or product testing.

If the testing of equipment used in hazardous areas is in accordance with AQ3009-2007 "Electrical Safety and Explosion Protection Code for Hazardous Areas", the testing cycle shall not exceed 3 years.

If it is product testing, it mainly follows the GB/T3836 series 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!