4.4　Other Facilities

4.4.1　If industrial buildings and outdoor units are in a mixed arrangement，lightning protection design shall be in accordance with the following principles:

1　If the superstructure is framework and substructure is industrial building，lightning protection requirements for outdoor unit shall be met.

2　If the superstructure is industrial building and substructure is framework，lightning protection requirements for industrial building shall be met.

3　If industrial buildings and structures are adjacent，their respective lightning protection requirements shall be met.

4.4.2　Control room and indoor substation and so on for petrochemical plant shall be assumed as industrial buildings，and lightning protection design for them shall comply with the current national standard GB 50057 Design Code for Protection of Structures against Lightning.