NFPA 780-Grounding

[alixenos]

Hi,

4.13.1.1 of NFPA 780:

"Each down conductor shall terminate to one of the
following:
(1)A grounding electrode dedicated to the lightning protection system
(2)A grounding electrode system of a building, structure, or
facility that has multiple grounding electrodes bonded
together with a ground ring electrode meeting the
requirements of 4.13.4"

what determines the choice of selecting where the down conductors will terminate?

thanks

 

[CoolWill]

I don't really know, but it seems to me that if you don't have #2, it has to be #1. And if you do have #2, it can be either #1 or #2. And if you have #2, but choose to use #1, you still have to bond them together.

 

[tom baker]

We see very few 780 questions here. It’s very specialized work.

 

[ron]

Hi,

4.13.1.1 of NFPA 780:

"Each down conductor shall terminate to one of the
following:
(1)A grounding electrode dedicated to the lightning protection system
(2)A grounding electrode system of a building, structure, or
facility that has multiple grounding electrodes bonded
together with a ground ring electrode meeting the
requirements of 4.13.4"

what determines the choice of selecting where the down conductors will terminate?

thanks

We do (2). We put in a robust Grounding Electrode System then we bond the lightning protection down conductors to it. 2 birds with 1 stone