For many decades, the principals and senior management of LPI have been providing specialist lightning protection advice to customers in some of the most. Visit our website and learn more about AS/NZS standards. You may require this Standard if you are an electricity network operator or electrical contractor and intend to: design; construct; commission.
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We need your help! The approach outlined in this section is based on the principles of the management of risk due to lightning outlined in initial work 17668 IEC Committee TC 81 on this subject. In some workplaces employees who work within larger buildings may be unaware of the changing outside weather conditions, and may not be aware that it may be unsafe to use telephone systems.
hzs This segregation of a part of a building is only valid under the following conditions: Only applicable to structures involved in the provision of public service utilities e. The structure may encompass a building and its associated outbuildings or equipment supports. Thunderstorm occurrence at a particular location is usually expressed in terms of the number of calendar days in a year when thunder was heard at the location, averaged over several years.
Subsequent treatment of a lightning strike patient is a specialized area with important differences from the treatment of injuries inflicted by electric power current.
AS1768-2007 – Lightning Protection
ad The risk assessment calculator is a simplified tool for the more common structure types. Please copy and paste this embed script to where you want to embed Embed Script.
It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. Similarly, if it were considered acceptable for such a loss to occur, on average, once every years, Ra for loss of economic value would be set at Ass telephone related deaths have been reported in Australia.
The object of this Section is to give a procedure for evaluation of the risk to a structure, people and installations or equipment in, on or connected to the structure. A number of completed spreadsheet examples are provided 17688 information in Appendix A. Persons and equipment within buildings can be at risk from aas indirect effects of lightning and Section 5 gives recommendations for the protection of persons and equipment within buildings from the effects of lightning.
AS/NZS – Standards Australia
What documents provide more information? This Standard was published on 10 January However, if you can show that you complied with the provisions of this standard then that will be regarded as evidence that you have met your obligation to carry out electrical work safely.
Technical considerations include addressing the highest risk components while economic considerations involve minimizing the total cost to achieve a suitable level of protection.
It is a relatively complex function and depends on— a the resistance component R as measured by an earth tester; b the reactance component Xdepending on the circuit path to the general body of earth; and c a modifying reducing time-related component depending on soil ionization caused by high current and fast rise times.
Consequential effects of lightning damage may extend to the surroundings of a structure. There is a significant risk of side-flash for people in small, public structures such as picnic shelters, particularly those with unearthed metallic roofs. Other work sheets showing the calculated values of all of the individual risk components for each type of risk are also accessible if a more in depth analysis is required.
Risks less than 10 —5 per year i. Successive calculations can be performed to observe the effects of various protection measures.
This Standard is intended to provide authoritative guidance on the principles and practices of lightning protection for a wide range of structures and systems. Many human activities imply a judgement that the benefits outweigh the related risks. Observance of these rules will ensure that appropriate interception protection is provided by air terminals for the parts of structures most likely to be damaged by direct lightning strikes, that the conduction of the lightning current by the downconductors is adequate and that it is dissipated into the earth by the earth terminations.
Conventional fabric tents offer no protection; small sheds offer uncertain protection. For information about these services, users should contact their respective national Standards organization. This front page presents all of the inputs and final calculation outputs required in the risk management process. If unavoidable, keep it brief and try not to touch electrical appliances, personal computers, metal pipes, stoves, sinks, and any other metallic objects at the same time.
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Each year a number of persons are struck by lightning, particularly when outdoors in open space such as an exposed location on a golf course, or when out on the water. In terms of the risk of various types of losses due to lightning, a value of the tolerable risk, R a needs to be specified. The spreadsheet implements the risk calculations detailed in Appendix A with the required inputs and outputs presented on a single page for ease of use. This may involve the application of industry specific Standards.
Irrespective of claimed performance, air terminals shall be placed in accordance with Section 4 to comply with this Standard.