A: Special security category. Refers to the use of special facilities, major construction projects involving national public security, and buildings that may have serious secondary disasters and other particularly serious disaster consequences and need special fortification. Class a for short.

B: key safety categories. It refers to lifeline-related buildings whose functions cannot be interrupted or need to be restored as soon as possible during an earthquake, and buildings that may cause a large number of casualties and other major disaster consequences during an earthquake and need to improve their fortification standards. Class b for short.

C: standard fortification category. Refers to a large number of buildings fortified according to the standard requirements except 1, 2 and 4. Referred to as class C.

D: medium safety category. Refers to the building with a small number of users, and the earthquake damage does not produce secondary disasters. Under certain conditions, the requirements are allowed to be moderately reduced. Class d for short.

Classification of building fire protection

Building fire protection facilities are mainly divided into two categories, one is fire extinguishing system, and the other is safe evacuation system.

The operation, control and maintenance are carried out by the fire control room in the building, so that the fire control facilities of the building are always in a good and effective state and the fire safety of the building is guaranteed.