Lightning protection

With AI, An and B-classified installations on electrified railways, spark gaps in the danger zone must be explosion proof [12]. Insulating couplings and spark 

If the protection ground is connected via a breakdown fuse, the insulating unite and spark gap can be disregarded 

With Ain installations, enclosed fireproof spark gaps are sufficient. These must respond before arcing at the insulating eoupling. If a tank installation is near the ground of a mast, it must be carefully investigated to see whether there is a proximity problem in the sense of Ref. 15. 

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Remove/isolate interference sources Periodically test grounding Provide adequate lightning protection... 

NFPA 780 Standard for the Installation of Lightning Protection Systems. National Fire Protection Association, Quincy, MA. 

So that the function of the spark gap isolators is not cancelled, cables with lightning protection must have insulated sleeves installed at their ends, in addition to the spark gap isolators, so that the metal sheathing or the shield that is connected at soldered joints to the lightning reinforcement is also separated from the operational ground of the building (foundation ground) and from the ground at the remote end. 

Lightning. Protection is generally provided by earthing with low resistance, e.g. 7 Q, which should be short and direct. The recommended value for protection of plant is <10 Q. 

Flammable and Combustible Liquids Code Standard for the Installation and Use of Stationary Combustion Engines and Turbines National Electrical Code Recommended Practice on Static Electricity Lightning Protection Code... 

Noncombustible construction and a lightning protection system with aerials and counterpoise. 

Since most storage tanks release flammable vapors at seals and vents, they are susceptible to lightning induced fires. Common European practice is to provide lightning rods on the highest vessel at a facility to provide a cone of protection for the facility. NFPA 780 provides additional guidance for the provisions of lightning protection measures. 

Buildings that are more than 15.2 meters (50 ft.) high, contain combustible liquids in large amounts or store explosive materials should be provided with lightning protection measures according to the requirements of NFPA 780. 

Approved lightning protection systems are the integrally mounted system, the separately mounted shielding system (mast type), and the separately mounted shielding system (overhead ground wire). Details of all of these systems are described in the Ref... 

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