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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The risk assessment calculator is a simplified tool for the more common structure types. The remaining steps are referred to in the design rules and their application is referred to in subsequent sections. Tall trees and surrounding buildings may shield a structure from lightning strikes. The selection of the most suitable protection measures shall be made by the designer according to the contribution of each risk component to the total risk, and according to the technical and economic aspects of the different protection measures available.
You may require this Standard if you are an electricity network operator 7168 electrical contractor and intend to:.
For most structures, only Aas and L4 will need to be considered. It may be composed of one or more simple probabilities of damage. In general, it is not economically possible to provide total protection against all the possible damaging effects of lightning, but the recommendations in this Standard will reduce the probability of damage to a calculated acceptable level, and will minimize any lightning damage that does occur.
However, the modern approach is that of risk management, which integrates the determination of the need for protection with the selection of adequate protection measures to reduce the risk to a tolerable level. Technical considerations include addressing the highest risk components while economic considerations involve minimizing the total cost to achieve a suitable level of protection.
Persons within a substantial structure are normally protected from direct strikes, but may be exposed to a hazard from conductive electrical services entering the structure or from conductive objects within the structure that may attain different potentials. This process is also known as risk management. Any decision not to provide lightning protection should only be made after considering the advice provided in this Standard.
This figure has been derived from ground flash density data obtained from the Lightning Detection Network of New Zealand for the period January 1, through February 9, The pool should be evacuated in a time interval of less than 30 s and people should be directed to a safe shelter nearby. The appendices form an integral part of this Standard unless specifically stated otherwise.
Consequential effects of lightning damage may extend to the surroundings of a structure. If unavoidable, keep az brief and try not to touch electrical appliances, personal computers, metal pipes, stoves, sinks, and any other metallic objects at the same time. 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.
For certificates to be issued, the small generation unit must meet certain conditions and guidelines. You may require this Standard if aa are an electricity network operator or electrical contractor and intend to: This Standard was issued in draft form for comment as DR 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.
Where danger from other causes such as toxicity, asphyxiation, and radioactivity may arise this is specifically mentioned.
This front page presents all of the inputs and final calculation outputs required in the risk management process. Compliance with the recommendations of this Standard will not necessarily prevent damage or personal injury due to lightning but will reduce the probability of such damage or injury occurring.
A code of practice can be defined as a result of legislation or by industry regulators and bodies.
AS / NZS Lightning Protection
Museums and heritage listed buildings have a cultural value. The surge protection options offered are for: The possible input options are explained in a comment box, which is displayed when the cursor is positioned over the input cell. For example, the nature of the burns and the extent of damage to underlying muscle tissue tend to be severe with electric power current, but mild with lightning current.
Where specific information is known regarding the function or use of a particular structure, alternative damage jzs values may be selected based on 17768 relations. Mobile and cordless telephones are safe to use indoors.
AS1768-2007 – Lightning Protection
Conventional 168 tents offer no protection; small sheds offer uncertain protection. Between editions, amendments may be issued. If surrounded by trees, seek a position outside the foliage and crouch, keeping the feet together.
For each protection level, a set of maximum sizing criteria and minimum interception criteria lightning current parameters is fixed, together with the corresponding rolling sphere radius.
It consists of both external and internal LPSs and nxs defined as a set of construction rules, based on corresponding protection level. When moderate to loud thunder is heard, persons out of doors should avoid exposed locations and should seek adequate shelter. Please help us to share our service with your friends. Some special hazard factors also need to be considered. In this case, the jzs does not require any specific protection against direct lightning strikes or against overvoltages due to nearby strikes or transmitted through the incoming conductive electrical service lines.
Section 2 provides guidance to assist in this decision. It should also be noted that the usual neurological criteria for death may be unreliable in this situation. It ass also be important to specify other protection measures such as SPDs on incoming conductive electrical service lines and internal equipment.
AS/NZS – Standards Australia
The TP for incoming services includes the use of isolation devices, the shielding of cables and the installation and coordination of SPDs. This standard provides guidelines for the protection of people and property from lightning. Standards may also be withdrawn.
In such a case the tolerable risk, R a for loss of economic value would be set at 10 We need your help! A person touching or close to an object struck by lightning may be affected by a side-flash, or receive a shock due to step, touch or transferred potentials.
Avoid driving the car as a strike to the car may blow out the tyres. This includes information on the size, material, and form of conductors, the positioning of air terminals and downconductors, and the requirements for earth terminations. The following are represented on Committee EL Nzz unnecessary contacts with communication or navigation equipment. Where doubt exists as to the need for lightning protection, further advice should be sought from a lightning protection designer or installer.
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. nzss