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

If it is the testing of equipment used in hazardous areas, it is in accordance with AQ3009-2007 "Electrical Safety and Explosion Prevention Code for Hazardous Areas", and 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 equipment in hazardous areas, as well as explosion-proof certification and coal safety certification services for products. Welcome to consult!