Is the third type of lightning protection building mandatory?

The third type of lightning protection buildings do not necessarily need compulsory testing.

This depends on whether your third-level lightning protection building has been included in the management of key lightning protection units, such as a school house, which has been included in the management of key lightning protection units, so lightning protection safety testing is needed. An ordinary residential building is not included in the management of key lightning protection units, and the property or residents do not need to carry out lightning protection safety testing, so it is not compulsory testing.

In a word, the difference between the third type of lightning protection buildings and the first and second types depends on the situation, and compulsory testing is not necessary.