grounding a lightning rod

[wwstrick]

I have thought that the ground terminal provided for a lightning rod should be separate from the grounding system provided for the building wiring. I found a building here where the two are bonded together. Where can I find a rule that would apply to clarify this? I am not installing a lightning rod system but have been asked to comment on an existing installation.

 

[A/A Fuel GTX]

All grounding electrodes must be tied together to keep everything at the same potential.

 

[FionaZuppa]

i think once you get into the volts of lighting, its better to keep that separated from everything else. how you achieve that requires some science & math.

 

[roger]

i think once you get into the volts of lighting, its better to keep that separated from everything else. how you achieve that requires some science & math.

Doesn't matter, lightning protection systems are required to be connected to the NEC electrodes, this can be found in NFPA 780 chapter 4.

Roger

 

[jumper]

Doesn't matter, lightning protection systems are required to be connected to the NEC electrodes, this can be found in NFPA 780 chapter 4.

Roger

I will toss in 250.60 and 250.106 NEC 2014 also.