Lightning and electrical contractors follow these rules
when installing a lightning configuration designed to protect individuals, belongings as well as the structure of a residence or home.
1. All structures under 250 ft around should have at least 2 groundings.
2. If the structure is more than 250 ft around please add 1 ground per 100 ft.
3. Treat all structures the same whether they are metal buildings, timber framed barns, residential homes.
4. Cables need to be neatly laid out with no,( I repeat NO), loops, dips, hard 90 degree turns.
5. Do not mix metal types! If you have a copper roof use copper hardware, cable, lightning rods and vice versa Aluminum with aluminum roof applications.
6. Aluminum hardware should never be installed under the ground.
Primary Lightning Protection Components
• Air Terminals (rods)
• Conductor (cable)
• Bonds with metallic bodies
• Ground Terminations
• Surge Arrestors Design Rules
A. Space rods evenly, no more than 20 feet apart.
B. End rods should be no more than than 2 feet from the end (1 foot is typical).
C. Fasten cable every 3 feet.
D. Connect vents and antennas with grounding clamps or lugs if within 6 feet of the lightning wire.
E. For a neat job run the down cables next to down spouts, molding, etc. and connect to ground rods (make connection below ground).
Links to other Lightning Protection Guidelines
UL (Underwriters Laboratories) Installation Guidelines
Arborist (Tree-Top) Protection and Grounding
Barn and Outdoor Structure Lightning Protection and Grounding
|
