As a combined explosion-proof device, a chemical storage cabinet is generally composed of explosion-proof distribution devices, explosion-proof lamps, explosion-proof buttons, smoke detectors, audible and visual alarms, air conditioners, flexible connecting pipes and other components. The basic requirement for a combined device to obtain the Ex Certificate for the complete machine is that all electrical components must be procured and installed with valid Ex Certificates, and the explosion protection rating of each electrical component shall not be lower than that of the complete machine. The Ex marking of the overall Ex Certificate is a combination of the Ex markings of all individual electrical components.

Given the large size and inconvenient transportation of such equipment, Zhongnuo Testing generally adopts the on-site testing method for certification.

Below are the successful certification acquisition cases of STS.