Both the installation of an effective transient overvoltage protection components in industrial foundations, business and residential environment, and The installation of Class B products which are located in building’s main panel for the protection against all electromagnetic interference requires coordinated involvement of Class C Surge protection devices which are used for the protection of secondary panel. In this way, the effectiveness of protection and the resistance of products could be provided by the protection of main and secondary panels.
If you have any kind of buildings are shown above and if the length between main panel and secondary panel is more than 10 meters then you need the C class surge protection devices, Unless there is no B+C class protection devices.
Especially In your Building and establishment
If there is an Outdoor lightning protection system
