I am installing a conventional copper rod on the top of a metal roof top.
I am concerned whether the roof top and the spike rod base are to be insulated with porcelain insulator?
Scenario: When lightning strikes the spiked air rod, part of the electricity is conducted by the GI roof top which is in turn connected to concrete terrace of the house AND also the electricity is conducted to the ground via copper strip cable.
I am worried, how would I connect the spike rod to the GI roof sheet. Whether any isolation/insulation is needed? My poor electrician says, it can be connected with a iron stand (he would screw iron stand between GI sheets and the copper spike rod) and would pose no problems since the lightning bolt is transferred to the ground.
In the second rod image I can see the 4 screws, since screws conduct lightning I am just assuming its not a good option.
Any help is greatly appreciated.
