LIGHTNING PROTECTION
LIGHTNING PROTECTION
(OP)
Steel Structure Telecommunication Tower is provided to be protected from the Lightning.
Is it true that Lightning Rod ( Air Terminal) is not necessary to be specified because Telecommunication Tower is Air Terminal ? Where to install a ground wire connected to the Grounding ?
Is there any Article describing that problem ?
Is it true that Lightning Rod ( Air Terminal) is not necessary to be specified because Telecommunication Tower is Air Terminal ? Where to install a ground wire connected to the Grounding ?
Is there any Article describing that problem ?






RE: LIGHTNING PROTECTION
A telecom tower (5/16" thick steel) will provide protection for the building if the tower is large and the building is small and close by, but it is of any real size, then you need additional air terminals.
The tower gets bonded per to the lightning protection system per the standards listed at the top.
RE: LIGHTNING PROTECTION
RE: LIGHTNING PROTECTION
RE: LIGHTNING PROTECTION
No need to have an air termination if the top of the tower is high enough to shield the uppermost antennae or they are a type that have integral lightning conductors.
Connect the very bottom of the tower to the lightning ground e.g. where the holding-down bolts fix the plates at the concrete.
Route the coax cables off a sharp right angles some distance up from grond level e.g. 2.5 meters. this si so that stroke current will proceed down tower and not tend to turn the sharp bend with the coaxial cables.
You must bond the outer screen conductor of the coax cables at the top and at the lower point where they depart the tower. Otherwise you can have a side flash that will damage the cables.
RE: LIGHTNING PROTECTION
Coaxial surge protection may be applicable in this situation. Although written to promote their own products, there may be some more universal information at URLs like www.polyphaser.com/ppc_technical.asp
RE: LIGHTNING PROTECTION
RE: LIGHTNING PROTECTION
Bonding to prevent side flashing is important (as previously mentioned), similarly care must also be taken to prevent re-entrant loops.
You may find IEC 1024 useful, though in my experience (back in 2000) it is not as comprehensive as the BS.
_______________________________________
Regards -
Colin J Flatters
Consulting Engineer & Project Manager
RE: LIGHTNING PROTECTION
http://www.sundayobserver.lk/2003/05/18/new25.html
however, if the transmitter is supposed to be in service, lightning arresters will be needed. Therefore, there is a need for the lightning protection system of the tower. The article also states that some "ball" falling away from the lightning strike to the tower may materialize.