This method which is known as the Franklin rod or catching end systems, is a method of protection from lightning made up of a simple metal end, landing conductor and earthing sections used to protect tower type places from lightning. It is able to protect an area determined with a fixed protection angle. This protection angle is selected from the table below according to the level of protection from lightning required to be calculated for installation. The protection area in this system varies in accordance to this angle and to the height of the catching end off from the ground.
Application Areas
• Tower type constructions with small bases
• Mosque Minaret, Light House, Sentry Box, etc
• Special Point Protection in Faraday Caged constructions
• Chimney projections, equipment especially on flat roofs, elevator towers, etc...
Franklin Rod Protection Cone Top Half Angles
|
|
a Angle
|
H ( Height )
|
|
20 M
|
30 M
|
45 M
|
60 M
|
|
Level-1
|
a
|
25
|
*
|
*
|
*
|
|
Level-2
|
a
|
35
|
25
|
*
|
*
|
|
Level-3
|
a
|
45
|
35
|
25
|
*
|
|
Level-4
|
a
|
55
|
45
|
35
|
25
|
