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a) The mining explosion-proof type (Ex d I Mb) has been changed to the mining explosion-proof type (Ex db I Mb);

b) The mining explosion-proof and pouring sealing type (Ex d mb I Mb) has been changed to the mining explosion-proof and pouring sealing type (Ex db mb I Mb);

c) Devices such as explosion-proof and intrinsically safe sound and light alarms, explosion-proof and intrinsically safe display screens, which have both built-in installation and associated devices and do not require users to connect to the intrinsically safe part, are originalExplosion proof signsChange Ex d [ib] I Mb to Ex db ib I Mb;

d) Explosion proof and intrinsically safe power supply, explosion-proof and intrinsically safe substation and other equipment, originalExplosion proof signsEx d [ia] I Mb needs to be changed to Ex db [ia Ma] I Mb, and the original explosion-proof symbol Ex d [ib] I Mb needs to be changed to Ex db [ib Mb] I Mb

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