turtlepokerman
Electrical
- Jan 7, 2015
- 7
Greetings,
I have a NFPA 780 question on antenna support lightning protection. Currently I have a building with a lightning protection ring and air terminals mounted 2' from the edge of the ridge line of the building with 20' horizontal spacing. Antennas and their supports were added after the original design. The top of new pipe mount antenna supports sit 3-4" below the tips of the strike termination devices (a.k.a. Air Terminals). The contractor ran a single ended Class I main conductor cable out to each antenna mount. The sidewall thickness of the pipe that supports the antenna is greater than 3/16".
My question is if the antenna mount is considered a strike termination device and if it needs to be double ended bonded to the lightning protection ring on the roof or if single ended bonding to the lightning protection ring on the roof is considered acceptable?
All help is appreciated!
I have a NFPA 780 question on antenna support lightning protection. Currently I have a building with a lightning protection ring and air terminals mounted 2' from the edge of the ridge line of the building with 20' horizontal spacing. Antennas and their supports were added after the original design. The top of new pipe mount antenna supports sit 3-4" below the tips of the strike termination devices (a.k.a. Air Terminals). The contractor ran a single ended Class I main conductor cable out to each antenna mount. The sidewall thickness of the pipe that supports the antenna is greater than 3/16".
My question is if the antenna mount is considered a strike termination device and if it needs to be double ended bonded to the lightning protection ring on the roof or if single ended bonding to the lightning protection ring on the roof is considered acceptable?
All help is appreciated!