a) Change from mining explosion-proof type (Ex d I Mb) to mining explosion-proof type (Ex db I Mb);

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

c) Explosion proof and intrinsic safety sound and light alarm, explosion-proof and intrinsic safety display screen, and other equipment that have both their own installation and related devices and do not require users to connect to the intrinsic safety partExplosion proof markChange Ex d [ib] I Mb to Ex db ib I Mb;

d) Explosion proof and intrinsic safety power supply, explosion-proof and intrinsic safety substation and other equipment, originalExplosion proof markEx d [ia] I Mb needs to be changed to Ex db [ia Ma] I Mb, and the original explosion-proof mark Ex d [ib] I Mb needs to be changed to Ex db [ib Mb] I Mb

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