The grounding ring for electrical testing has protective devices to prevent overhead insulated wires from lightning strikes and breakage, as well as for electrical testing and temporary grounding during maintenance and construction. FDL type lightning protection and grounding ring is a two in one product installed on the load side of the line insulator, specifically designed to prevent lightning strikes and wire breakage of 10-20KV overhead wires, as well as to serve as a testing and grounding device during maintenance and construction. The lightning resistance level of overhead insulated power lines is also troublesome.