Board type B class and C class surge arresters must be connected in parallel to the system. In Class B, C class section 16mm2 minimum we have to use a minimum of 6 mm2.
We can use technology protection insurance products in line in front of the product. NH fuse type is presented to the user by the manufacturer to be selected. But usually 125 Amps in class B, class C in 63 amp fuse used. Also cable should be as short as possible. 50 cm rule should be applied, if possible, and should not be circulated in the ground line to the clipboard.