Lightning Protection Systems.

The current of a massive direct lightning strike to a structure creates a magnetic field extending from the conductors, so any alternate circuit proximate may experience some added voltage through induction. A Wherever practical, connections to grounding electrodes should be made exterior to the foundation wall or far enough away to avoid buried footings, pipe caps, etc. The more paths the more we split the lightning into lower voltage segments, the less potential for arc over through any medium to alternate systems. Incorporating a steel superstructure into the lightning protection system provides columns and beams and intermediate connections to Extension of the lightning protection system to include Lightning protection systems are designed first and foremost as fire protection systems – to stop the building from burning down and losing the people and equipment inside. Lightning flashes to, or nearby, structures (or lines connected to the structures) are hazardous to people, to the structures themselves, their contents and installations need to be considered for protection measures.Depending upon the nature of LPS system and area to be protected the number of air termination will be decided. Generally the architect and engineers involved in the project will make the determination whether lightning protection is required by local building codes.

What are the Code Requirements Codes and Standards •National Electrical Code (NFPA 70) •National Fuel Gas Code (NFPA 54) •International Fuel Gas Code •Lightning Protection Std.

We bond or interconnect grounds and pipes to the lightning protection system to avoid a portion of this problem. Any other independently grounded building system in close proximity to lightning protection components would be at 0 volts, so the natural tendency is for some or all the lightning to leave our current carrying system and flash over to the alternate ground path. The Protecting the highest most prominent building elements with strike termination devices, based on a building’s geometry, also provides some level of protection for lower extensions of the structure, or items in the “shadow” of the higher fully protected areas. NFPA 780 provides the best we know today in theory and technology on protection systems tested by experienced industry professionals in a legally recognized format.Product testing for lightning protection material components in the factory prior to shipment for listing and labeling is handled by Field inspection of completed lightning protection installations may also be arranged with UL through installing contractors listed in their program. The primary reason for a lightning protection system is to route that electrical energy to a less destructive path to ground — instead of traveling through the building’s electrical wiring, water piping, structure, or low-voltage cabling paths where it could create significant chaos inside the building. Aluminum can never come in contact with the earth or soil. The materials used for grounding electrodes must be suitable to any alkaline or acid composition of soils for long life.During a discharge of lightning current on a system of conductors, the grounding electrodes are to be thought of as the points through which the heavy current flows between the strike termination system and the earth about the structure.

In the United States, most industry and the government facilities are protected by NFPA 780 Standard for the Installation of Lightning Protection Systems. Lightning is the direct cause of over 50 deaths and 400 injuries each year, and it is difficult to protect individuals in exposed outdoor areas. (NFPA 780) •ANSI Standards •50 State Fuel Gas Codes No requirements for lightning protection

Contracting with professionals qualified through the LPI process ensures an added level of quality assurance for initial system installation and a resource for future inspection and maintenance of existing systems.Lightning protection systems for structures are typically not a requirement of national building codes, although the Standards may be adopted by the authority having jurisdiction for general construction or specific occupancies. Individuals sit for exams which include the requirements of the above listed lightning protection Standards and application of those principles to design examples. Part 4: Electrical and electronic systems within structures The severest problems are associated with There are also inductive effects possible to internal wiring and equipment with even a well designed lightning protection system.

Since lightning protection may be considered an option, it is crucial that the specifier, construction contractor, and property insurer be familiar with the national Standards to provide the highest level of safety available. Modern techniques for component manufacture and designs incorporating the system on and in a structure have changed the system look, but the philosophy behind strike termination, conduction, and grounding remains similar – accept the lightning and send it to ground. Standard for the Installation of Lightning Protection Systems NFPA 780 provides lightning protection system installation requirements to safeguard people and property from fire risk and related hazards associated with lightning exposure. IEC/BS EN 62305-3 provides the requirements for the protection of a structure against physical damage, by means of a lightning protection system, and for protection against injury to living beings due to touch and step voltages, in the vicinity of an LPS. Bringing metallic services into a structure provides paths for lightning to follow from the outside environment to create hazards within. The 780 document covers many specialty constructions from hazardous materials storage to boats and ships to open picnic structures, and gives recommendations for personal safety outdoors.

All electrical installations shall be carried out in accordance with the best International Standards and Codes of Practice specifically with the current issue of the IEE Regulations (BS 7671) and the requirements of the supply authority.

Re-roofing the building, making additions to the building’s structural frame, or adding vent stacks or antennas for new internal processes are obvious areas needing review and treatment.

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