BS EN 62305-4 PDF
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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A series of trial and error calculations is then required in order that a sufficient level of lightning protection can be defined. Part 1 General principles This is an introduction to the other parts of the standard.
In BSthe protection of electronic equipment is only bz in an informative annex. However, BS EN details the use of air rods or finials, catenary or suspended conductors or a meshed conductor network, in any combination. The first stage of the risk assessment is to identify the types of loss that a structure and its contents can incur.
SPDs also provide additional protection over bonding and shielding measures through protection in both common and differential modes. So there may be a heavy duty lightning current Type I SPD 26305-4 the service entrance to handle the majority of the surge energy, plus downstream overvoltage SPDs to protect terminal equipment.
If the actual risk R is lower than the tolerable risk Bxthen no protection measures are needed. Customers who bought this product also bought BS EN Maintenance, Inspection, Building services, Electromagnetic fields, Test methods, Hazard prevention in buildings, Lightning protection, Electrical equipment, Lightning, Structures, Damage, Electrical protection equipment, Earthing, Electronic equipment and components, Electrical installations, Climatic protection, Lightning conductors, Electrical safety, Telecommunication systems, Buildings, Surge protection, Installation.
It includes many more parameters than BS which e 9 pages including figures, whilst BS EN contains some pages. BS EN contains extensive sections, with detailed explanations on the reasons for, and methodology of, equipotential bonding. This simply means a series of SPDs whose locations and LEMP handling attributes are co-ordinated in such a way 62305–4 to protect the equipment in their environment by reducing the LEMP effects to a safe level. Accept and continue Learn more about the cookies we use and how to change your settings.
LPZ 1 sees limited induced current and damped magnetic field whilst LPZ 2 has a further reduction of induced current and further damped magnetic enn. This website is best viewed with browser version of up to Microsoft Internet Explorer 8 or Firefox 3. Lightning and surge protection. 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.
Moreover, established suppliers of lightning protection solutions are now offering a wealth of quality support tools.
BS EN 62305-4:2011
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.
For example, consider the mesh sizes for an air termination network and spacing of down conductors in BS EN Expanding on an article in the May issue of Electrical 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.
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.
Most read Latest news. If R is greater than RT, then protection measures, as determined from the tables given in the standard, are required.
Lightning protection – Mastering the maze of BS EN
From that risk assessment, a structure may need sb a structural LPS and a fully co-ordinated set of surge protection devices SPDs or just overvoltage protection alone. Debut for hybrid system for automotive connectivity. 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. When applying bonding, shielding and SPDs, technical excellence must be balanced with economic necessity.
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Take the smart route to manage medical device compliance. BS EN will take some time for people to fully interpret and comprehend, but by using the resources available, the issues they may initially encounter certainly can be mastered.
These include risk assessment software to automate the complex and repetitive risk calculations, new technical literature, training seminars and face-to-face assistance. The actual risk R is then arrived at through a series of calculations, using formulae in the standard and including various weighting factors. However, for an existing structure, retrofitting a set of co-ordinated SPDs is likely to be the easiest and most cost-effective solution. Search all products by. Structural lightning protection cannot now be considered in isolation from transient overvoltage or surge protection.
Protection levels within bd 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. Call to action for 62035-4 in training. The new standard also includes three methods for determining the position of the air termination system: BS EN came 623054- force on 1 September Related Articles Be prepared for lightning Lightning Protection – Combined lightning and surge arresters: