Quick Answer
An air terminal, also known as a lightning rod, is installed on a metal roof using a specialized mounting system that ensures proper grounding and electrical conductivity. The installation typically involves screwing the air terminal to a mounting bracket, which is then attached to a grounding rod. This setup protects the structure from lightning strikes.
Choosing the Right Air Terminal and Mounting Bracket
When selecting an air terminal for a metal roof, consider the National Fire Protection Association (NFPA) standards for lightning protection systems. The air terminal should be designed for outdoor use and made from a conductive material such as copper or aluminum. A mounting bracket specifically designed for metal roofs is essential to ensure a secure connection. Some popular types of mounting brackets include the “U” bracket and the “J” bracket, which provide a sturdy attachment point for the air terminal.
Installing the Air Terminal and Grounding Rod
To install the air terminal on a metal roof, follow these steps: (1) locate the best point on the roof for the air terminal, taking into account wind direction and roof pitch; (2) screw the air terminal to the mounting bracket using a minimum of three screws; (3) attach the mounting bracket to the grounding rod, using a conductor such as 6 AWG or 4 AWG wire; (4) drive the grounding rod into the earth to a depth of at least 10 feet. This setup provides a secure path to ground for lightning strikes, protecting the structure from damage.
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