BS EN Protection against lightning Part 4: Electrical and electronic systems within structures. BS EN Physical damage to structures and life hazard. Lightning Protection System (LPS). BS EN Electrical and electronic systems within . requirements of BS EN range of standards, the is relatively new and replaced the BS document. Risk Management – Bs EN
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If the actual risk R is lower than the tolerable risk RTthen no protection measures are needed. So there may be a heavy duty lightning current Type I SPD at the service entrance to handle the majority of the surge energy, plus downstream overvoltage SPDs to protect terminal equipment.
Call to action for investment in training. These include risk assessment software to automate the 62035-4 and repetitive risk calculations, new technical literature, training seminars and face-to-face assistance.
Lightning Protection – Out with the old, in with the new StrikeRisk for lightning calculations Overvoltage – When lightning strikes.
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Lightning protection – Mastering the maze of BS EN
Search all products by. Once the applicable types of loss have been identified, a tolerable risk RT for each can 623054- looked up in a table contained in the National Annexes.
Part 3 Physical damage to structures and life hazards The third part of the new standard relates directly to the main body of BSbut there are significant differences between the two. You may experience issues viewing this site in Internet Explorer 9, 10 or SPDs also provide additional protection over bonding and shielding measures through protection in both common and differential modes.
LPZ 1 sees limited induced current and damped magnetic field whilst LPZ 2 has a further reduction of induced current and further damped magnetic field. For new builds, bonding and screening measures can be integrally designed to form part of the complete lightning protection measures system LPMS.
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For example, consider the mesh sizes for an air termination network and spacing of down conductors in BS EN Accept e continue Learn more about the cookies we use and how to change your settings. At the moment, it runs concurrently with BSbut ultimately BS will be withdrawn and BS EN will be the only recognised standard by the end of August This ensures equipment is not only protected from damage but also remains operational during lightning activity.
It includes many fn parameters than BS which devotes 9 pages including figures, whilst BS EN contains some pages. Resources and Waste Strategy release. Structural lightning protection cannot now be considered in isolation from transient overvoltage or surge protection.
BS EN goes further, categorising inspection into visual inspection, complete inspection and critical systems complete inspection, whose frequency depends on the LPL in force.
The BS British Standard on lightning protection has existed for decades. However, for an existing structure, retrofitting a set of co-ordinated SPDs is likely to be the easiest and most cost-effective solution. Switches support high performance. From that risk assessment, a structure may need both a structural LPS and sn fully co-ordinated set of surge protection devices SPDs or just overvoltage protection alone.
You may find similar items within these categories by selecting from the choices below:. The existing fabric and layout of a building may make readily apparent zones, or LPZ techniques may have to be applied to create the required zones. A series of trial and 62350-4 calculations 6230-54 then required in order that a sufficient level of lightning protection can be defined.
Protection levels within a zone must be co-ordinated with the immunity characteristics of the equipment to be protected, ie, the more sensitive ne equipment, the more protected the zone required.
However, the key principles are well established and pretty familiar to all. Debut for hybrid system for automotive 26305-4. In BSa mesh arrangement was the commonly used layout for the air termination network. This simply means a series of SPDs whose locations and LEMP handling attributes are co-ordinated in such a way as to protect the equipment in their environment by reducing the LEMP effects to a safe level.
BS EN 62305-4:2011
Moreover, established suppliers of lightning protection solutions are now offering a wealth of quality support tools.
Part 4 Electrical and electronic systems within structures This part contains one of the most critical differences between the two standards. It requires the bonding of all metallic services to the main equipotential bonding bar. However, BS EN details the use of air rods or finials, catenary or suspended conductors or a meshed conductor network, in any combination. Appropriate SPDs should be fitted wherever services cross from one LPZ to another Conclusion So, this brief overview of the new BS EN lightning protection standard clearly demonstrates how it is more complex and exacting than its predecessor.
BS EN contains a series of National Annexes, from which individual countries, like the UK, have used their own interpretation and perception of risk to compile parameters for certain elements of the risk assessment. Successive zones are therefore characterised by significant reductions in LEMP severity, achieved through a combination of protection measures such as bonding, shielding and the use of SPDs. Part 1 General principles This is an introduction to the other parts of the standard.