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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However, BS EN details the use of air rods or finials, catenary or suspended conductors or a meshed conductor network, in any combination.
It includes many more parameters than BS which devotes 9 pages including figures, whilst BS EN contains some pages. If the actual risk R is lower than the tolerable risk RTthen no protection measures are needed.
Most read Latest news. BS EN goes further, categorising inspection into visual inspection, complete inspection and critical systems complete inspection, whose frequency depends on the LPL in force. 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 623005-4 parameters for certain elements of the risk assessment.
Structural lightning protection cannot now be considered in isolation from transient overvoltage or surge protection. Once the applicable types of loss have been identified, a tolerable risk RT for each can be looked up in a table contained in the National Annexes.
Lightning and surge protection. 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.
Accept and continue Learn more about the cookies we use and how to change your settings. 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.
Click to learn more. Learn more about the cookies we use and how to change your settings. Related Articles Be prepared for lightning Lightning Protection – Combined lightning and surge arresters: It requires the bonding of all metallic services to the main equipotential bonding bar.
BS EN 62305-4:2011
Expanding on an article in the May issue of 6230-54 Review John Sherlock of Furse pictured rightoffers an overview of the new standard and the consolation that, complex as the new standard may be, its key concepts are not alien, and, with relevant technical advice and support, it can be mastered. You may find similar items within these categories by selecting from the choices below:.
In BSthe protection of electronic equipment is only included in an informative annex. Moreover, established suppliers of lightning protection solutions are now offering a wealth of quality support tools. Protection levels within a zone must be co-ordinated with the immunity characteristics of the equipment to be protected, ie, the more sensitive the equipment, the more protected the zone required.
Lightning protection – Mastering the maze of BS EN
These include risk assessment software to automate the complex and repetitive risk calculations, new technical literature, training seminars and face-to-face assistance. Switches support high performance. The new standard consists of four parts: It does not, however, take into account the economic value of consequential losses from system downtime.
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 For example, consider the mesh sizes for an air termination network and spacing of down conductors in BS EN Your basket is empty.
The first stage of the risk assessment is to identify the types of loss that a structure and its contents can incur.
BS EN came into force on 1 September From that risk assessment, a structure may need both a structural LPS and a fully co-ordinated set of surge protection devices SPDs or just overvoltage protection alone. When applying bonding, shielding and SPDs, technical excellence must be balanced with economic necessity.
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. 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.
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.