Rickyghart
Member
- Location
- Dallas TX USA
I have a situation that I cannot find a definitive answer to but has me a bit worried. The structure is a 1000 car parking garage with a lightning protection system (LPS) - air terminals, bonding of all metal to a designated electrode conductor. I have not seen a UL label/plaque as yet. There is also a designated building electrode conductor to grounding points in numerous the data, communications, phone and electrical distribution equipment rooms on each floor.
The two grounding electrode conductors share the same path to the ground floor, often in contact with each other along the way down until reaching the ground floor where the two are bonded together.
I am uneasy with this arrangement thinking - perhaps too much - that a lighting strike on the LPS will find its way into electrical equipment before being drained to Earth.
I can find a reference that the actual electrodes must be no closer than 6 feet in 780 and understand the reason for this. However, nothing speaking to a requirement for two electrode conductor being separated.
any thoughts, discussion or code reference is appreciated!
Thanks
The two grounding electrode conductors share the same path to the ground floor, often in contact with each other along the way down until reaching the ground floor where the two are bonded together.
I am uneasy with this arrangement thinking - perhaps too much - that a lighting strike on the LPS will find its way into electrical equipment before being drained to Earth.
I can find a reference that the actual electrodes must be no closer than 6 feet in 780 and understand the reason for this. However, nothing speaking to a requirement for two electrode conductor being separated.
any thoughts, discussion or code reference is appreciated!
Thanks