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Lightning protection for an isolated metal structure

Lightning protection for an isolated metal structure

Lightning protection for an isolated metal structure

(OP)
I work at a coal fired power plant that recently installed a truck sampling station in an outlying area remote from anything by over 1000 feet. It's about 20' tall made of  heavy structural steel on a concrete foundation. The purpose is to safely get to the top of the coal truck. There are no electrical parts on it nor are any in the vicinity.  Would there be any reason to install a ground rod for lightning protection? Reference?
 

RE: Lightning protection for an isolated metal structure

There is an NFPA standard for evaluation of risk from lightning.

RE: Lightning protection for an isolated metal structure

1. Look at NFPA 780 as davidbeach said.
2. LP system is not normally required by code, but recommended. Look up applicable fire safety codes to your region.

3. Lighting risk is independent of electrical installation in the building. The electrical equipment, if installed, only increases the potential losses from the equipment damage. But risk to personnel does not change.

4. Review with your insurance carriers. They may have some say.

5. If it is a steel structure, installing a LP system would be relatively inexpensive. Buying peace of mind is also important.

6. You do not want the person on top of the structure to become the lightning rod either. So the rods should be installed accordingly.



 

RE: Lightning protection for an isolated metal structure

What is your location? One of the major factors in the calculation is the number of lightning days per year. And that is wholly dependant on location.  It is a fairly simple calculation.  You can also look it up at Thompson Lightning Protection's website. There is a complete risk evaluation guide and calculation procedure. go to www.tlpinc.com You can get the information on the system components there as well if you end up needing it.

EEJaime

RE: Lightning protection for an isolated metal structure

If the station is made of heavy structural steel, and nothing is combustible, then you don't need air terminals and downleads.  The structure serves this purpose.  The only question is grounding.  If the anchor bolts are tied to the rebar, you have a good ufer ground.  If not, you might want to drive a ground rod at each corner and bond to the steel column.  I don't think any amount of air terminals and downleads would get me up on top of the structure during a lightning storm.
 

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