{"id":791,"date":"2023-12-19T16:19:00","date_gmt":"2023-12-19T08:19:00","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&#038;p=791"},"modified":"2024-09-05T16:35:57","modified_gmt":"2024-09-05T08:35:57","slug":"en-62305-protection-against-lightning","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/sv\/blog\/en-62305-protection-against-lightning\/","title":{"rendered":"EN 62305 Skydd mot blixtnedslag"},"content":{"rendered":"The EN 62305 standard series specifically cover the protection against lightning to structures, their contents, persons and livestock.\r\n\r\nEN 62305 accepts that we now live in the electronic age, making LEMP (Lightning Electromagnetic Impulse) protection for electronic and electrical systems an integral part of the standard through EN 62305-4. LEMP is the term given to the overall electromagnetic effects of lightning, including conducted surges (transient overvoltage and currents) and radiated electromagnetic field effects.\r\n\r\nEN 62305 \u2013 4 categorizes the source of damage, type of damage and the type of loss.\r\n\r\n<strong>K\u00e4llor till skada<\/strong>\r\n\r\nSkador som kan orsakas av blixtnedslag \u00e4r indelade i:\r\n<ul>\r\n \t<li>Skador p\u00e5 en struktur (inklusive alla inkommande elektriska luftledningar och nedgr\u00e4vda ledningar anslutna till strukturen)<\/li>\r\n \t<li>Skada p\u00e5 en tj\u00e4nst (tj\u00e4nsten \u00e4r i detta fall en del av telekommunikation, data, elf\u00f6rs\u00f6rjning, vatten, gas och br\u00e4nsledistributionsn\u00e4t).<\/li>\r\n<\/ul>\r\n<img class=\"wp-image-17873 size-medium aligncenter\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/11-400x271.png\" alt=\"\" width=\"400\" height=\"271\" \/>\r\n\r\n<strong>Typer av skador<\/strong>\r\n\r\nVarje skadek\u00e4lla kan resultera i en eller flera av tre typer av skador. De m\u00f6jliga typerna av skador identifieras enligt f\u00f6ljande:\r\n<ul>\r\n \t<li>D1 Skada p\u00e5 personer eller boskap p\u00e5 grund av steg- och ber\u00f6ringssp\u00e4nningar<\/li>\r\n \t<li>D2 Fysisk skada (brand, explosion, mekanisk f\u00f6rst\u00f6relse, kemikalieutsl\u00e4pp) p\u00e5 grund av blixtstr\u00f6mseffekter inklusive gnistor<\/li>\r\n \t<li>D3 Fel i interna system p\u00e5 grund av blixtelektromagnetisk impuls (LEMP).<\/li>\r\n<\/ul>\r\n<strong>Typer av f\u00f6rlust<\/strong>\r\n\r\nF\u00f6ljande typer av f\u00f6rluster kan uppst\u00e5 p\u00e5 grund av skador p\u00e5 grund av blixtnedslag:\r\n<ul>\r\n \t<li>L1 F\u00f6rlust av m\u00e4nniskoliv<\/li>\r\n \t<li>L2 F\u00f6rlust av service till allm\u00e4nheten<\/li>\r\n \t<li>L3 F\u00f6rlust av kulturarv<\/li>\r\n \t<li>L4 F\u00f6rlust av ekonomiskt v\u00e4rde<\/li>\r\n<\/ul>\r\nThe relationships of all of the above parameters:\r\n\r\nThe relationships of all of the above parameters:\r\n<table border=\"1\" cellspacing=\"0\">\r\n<tbody>\r\n<tr class=\"firstRow\">\r\n<td valign=\"top\" width=\"142\">Slagpunkt<\/td>\r\n<td valign=\"top\" width=\"142\">K\u00e4lla till skadan<\/td>\r\n<td valign=\"top\" width=\"142\">Typ av skada<\/td>\r\n<td valign=\"top\" width=\"142\">Typ av f\u00f6rlust<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Strukturera<\/td>\r\n<td valign=\"top\" width=\"142\">S1<\/td>\r\n<td valign=\"top\" width=\"142\">D1&nbsp;\r\n\r\nD2\r\n\r\nD3<\/td>\r\n<td valign=\"top\" width=\"142\">L1, L4**&nbsp;\r\n\r\nL1, L2, L3, L4\r\n\r\nL1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">N\u00e4ra en struktur<\/td>\r\n<td valign=\"top\" width=\"142\">S2<\/td>\r\n<td valign=\"top\" width=\"142\">D3<\/td>\r\n<td valign=\"top\" width=\"142\">L1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Tj\u00e4nst kopplad till strukturen<\/td>\r\n<td valign=\"top\" width=\"142\">S3<\/td>\r\n<td valign=\"top\" width=\"142\">D1&nbsp;\r\n\r\nD2\r\n\r\nD3<\/td>\r\n<td valign=\"top\" width=\"142\">L1,L4**&nbsp;\r\n\r\nL1, L2, L3, L4\r\n\r\nL1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">N\u00e4ra en tj\u00e4nst<\/td>\r\n<td valign=\"top\" width=\"142\">S4<\/td>\r\n<td valign=\"top\" width=\"142\">D3<\/td>\r\n<td valign=\"top\" width=\"142\">L1*, L2, L4<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n* Only for structures with risk of explosion and for hospitals or other structures where failures of internal systems immediately endangers human life.\r\n\r\n** Only for properties where animals may be lost.\r\n\r\nLEMP damage is so prevalent that it is identified as one of the specific types (D3) against which protection should be provided and can occur from ALL strike points to the structure or connected services \u2013 direct or indirect. This extended approach also takes into account the danger of fire or explosion associated with services connected to the structure, e.g. power, telecoms and other metallic lines.\r\n\r\nEN 62305 makes it clear that structural lightning protection must no longer be considered in isolation from transient overvoltage\/surge protection and given that lightning from all strikes points, direct or indirect, to the structure or connected services creates a risk from transients, SPDs are a vital means of protection whether structural lightning protection is present or not.\r\n\r\n<strong>Str\u00f6m- och sp\u00e4nningsv\u00e5gformer<\/strong>\r\n\r\nEN 62305 takes account of protection measures on metallic service lines (typically power, signal and telecom lines) using transient overvoltage or Surge Protection Devices (SPDs) against both direct lightning strikes as well as the more common indirect lightning strikes and switching transients. Standards such as the EN 61643 series define the characteristics of lightning currents and voltages to enable reliable and repeatable testing of SPDs (as well as lightning protection components). Although these waveforms may differ from actual transients, the standardized forms are based upon years of observation and measurement (and in some cases simulation). In general they provide a fair approximation of the real world transient.\r\n\r\nTransient waveforms have a fast rising edge and a longer tail. They are described through their peak value (or magnitude), rise time and their duration (or fall time). The duration is measured as the time taken for the test transient to decay to half its peak value.\r\n\r\nThe figures below illustrate the common current and voltage waveforms that are used to test SPDs for mains, signal and telecom lines.\r\n\r\n<img class=\"wp-image-17874 size-medium aligncenter\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-400x239.png\" sizes=\"(max-width: 400px) 100vw, 400px\" srcset=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-400x239.png 400w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-768x459.png 768w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-600x358.png 600w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-150x90.png 150w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12.png 1147w\" alt=\"\" width=\"400\" height=\"239\" \/>\r\n\r\n<strong>Direkta strejker<\/strong>\r\n\r\nDirekt blixt kan injicera partiella blixtstr\u00f6mmar av v\u00e5gformen 10\/350\u03bcs i ett system d\u00e4r en struktur med ett strukturellt \u00e5skskyddssystem f\u00e5r ett direktnedslag (K\u00e4lla S1) eller d\u00e4r blixten direkt tr\u00e4ffar en luftledning (K\u00e4lla S3).\r\n\r\n<strong>Indirekta strejker<\/strong>\r\n\r\nRemote or indirect lightning flashes near the structure (Source S2) or near a connected service to the structure (Source S4) of up to 1km radius away (and hence far more common) are represented by the 8\/20\u03bcs waveform. Induced surges from direct lightning flashes and switching sources are also represented by this waveform. With a much shorter decay or fall time relative to the 10\/350\u03bcs waveform, the 8\/20\u03bcs waveform presents significantly less energy (for an equivalent peak current) but is still devastating enough to damage electrical and electronic equipment.\r\n\r\nEN 62305-1 recognizes that failure of internal systems (Damage Type D3) due to Lightning Electromagnetic Impulse (LEMP) is possible from all points of strike to the structure or service \u2013 direct or indirect (all Sources: S1, S2, S3 and S4).\r\n\r\n<strong>\u00d6versp\u00e4nningsskydds\u00e5tg\u00e4rder (SPM)<\/strong>\r\n\r\nEN 62305-4 describes a number of measures to minimize the severity of transient overvoltage caused by lightning and electrical switching.\r\n\r\nKey and basic protection measures are:\r\n<ul>\r\n \t<li>Jordning och bindning<\/li>\r\n \t<li>Elektromagnetisk sk\u00e4rmning och linjedragning<\/li>\r\n \t<li>Koordinerade \u00f6versp\u00e4nningsskyddsanordningar<\/li>\r\n<\/ul>\r\nYtterligare ytterligare skydds\u00e5tg\u00e4rder inkluderar:\r\n<ul>\r\n \t<li>F\u00f6rl\u00e4ngningar av den strukturella LPS<\/li>\r\n \t<li>Utrustningsplats<\/li>\r\n \t<li>Anv\u00e4ndning av fiberoptiska kablar (skydd genom isolering)<\/li>\r\n<\/ul>\r\nSPMs also have to operate within and withstand the environment in which they are located considering factors such as temperature, humidity, vibration, voltage and current.\r\n\r\nSelection of the most suitable SPM is made using the risk assessment in accordance with EN 62305-2 taking into account both technical and economic factors. For example, it may not be practical or cost effective to implement electromagnetic shielding measures in an existing structure so the use of coordinated SPDs may be more suitable. Ideally SPDs are best incorporated at the project design stage, although they can also be readily installed in existing installations.\r\n\r\nTo ensure continuous operation of critical systems even in the event of a direct strike, SPDs are essential and these must be suitably deployed, based on the source of surge and its intensity using the Lightning Protection Zones (LPZ) concept within EN 62305-4.\r\n\r\n<strong>Konceptet Lightning Protection Zone (LPZ).<\/strong>\r\n\r\nSkydd mot LEMP bygger p\u00e5 ett koncept av Lightning Protection Zone (LPZ) som delar upp strukturen i fr\u00e5ga i ett antal zoner beroende p\u00e5 vilken hotniv\u00e5 som LEMP utg\u00f6r. Den allm\u00e4nna id\u00e9n \u00e4r att identifiera eller skapa zoner inom strukturen d\u00e4r det \u00e4r mindre exponering f\u00f6r vissa eller alla effekter av blixtnedslag och att samordna dessa med immunitetsegenskaperna hos den elektriska eller elektroniska utrustningen som \u00e4r installerad inom zonen. Successiva zoner \u00e4rk\u00e4nnetecknas av betydande minskningar av LEMP-sv\u00e5righet som ett resultat av bindning, avsk\u00e4rmning eller anv\u00e4ndning av SPD.\r\n\r\n<strong>Externa zoner:<\/strong>\r\n<ul>\r\n \t<li>LPZ 0A \u00e4r det omr\u00e5de som uts\u00e4tts f\u00f6r direkta blixtnedslag och kan d\u00e4rf\u00f6r beh\u00f6va b\u00e4ra upp till full blixtstr\u00f6m. Detta \u00e4r vanligtvis takytan p\u00e5 en struktur utan strukturellt \u00e5skskydd. Hela det elektromagnetiska f\u00e4ltet uppst\u00e5r h\u00e4r.<\/li>\r\n \t<li>LPZ 0B \u00e4r det omr\u00e5de som inte uts\u00e4tts f\u00f6r direkta blixtnedslag och \u00e4r vanligtvis sidov\u00e4ggarna p\u00e5 en struktur eller ett tak med strukturellt \u00e5skskydd. Men det fulla elektromagnetiska f\u00e4ltet upptr\u00e4der fortfarande h\u00e4r och ledda partiella eller inducerade blixtstr\u00f6mmar och kopplingsst\u00f6tar kan uppst\u00e5 h\u00e4r.<\/li>\r\n<\/ul>\r\n<strong>Inre zoner:<\/strong>\r\n<ul>\r\n \t<li>LPZ 1 \u00e4r det inre omr\u00e5de som uts\u00e4tts f\u00f6r partiella blixtstr\u00f6mmar. De ledande \u00e5skstr\u00f6mmarna och\/eller kopplingsst\u00f6tarna reduceras j\u00e4mf\u00f6rt med de yttre zonerna LPZ 0A, LPZ 0B liksom det elektromagnetiska f\u00e4ltet om l\u00e4mpliga sk\u00e4rmnings\u00e5tg\u00e4rder anv\u00e4nds. Detta \u00e4r vanligtvis det omr\u00e5de d\u00e4r tj\u00e4nster kommer in i strukturen eller d\u00e4r huvudstr\u00f6mst\u00e4llverket \u00e4r placerat.<\/li>\r\n \t<li>LPZ 2 \u00e4r ett inre omr\u00e5de som \u00e4r ytterligare placerat inuti strukturen d\u00e4r resterna av blixtimpulsstr\u00f6mmar och\/eller kopplingsst\u00f6tar reduceras j\u00e4mf\u00f6rt med LPZ 1. P\u00e5 samma s\u00e4tt reduceras det elektromagnetiska f\u00e4ltet ytterligare om l\u00e4mpliga sk\u00e4rmnings\u00e5tg\u00e4rder anv\u00e4nds. Detta \u00e4r vanligtvis ett avsk\u00e4rmat rum eller, f\u00f6r n\u00e4tstr\u00f6m vid undercentralen.<\/li>\r\n<\/ul>","protected":false},"featured_media":792,"parent":0,"menu_order":180,"template":"","meta":{"_acf_changed":false},"blog_category":[8],"class_list":["post-791","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-company-news"],"acf":{"des":"The EN 62305 standard series specifically cover the protection against lightning to structures, their contents, persons and livestock.","txt":"The EN 62305 standard series specifically cover the protection against lightning to structures, their contents, persons and livestock.\r\n\r\nEN 62305 accepts that we now live in the electronic age, making LEMP (Lightning Electromagnetic Impulse) protection for electronic and electrical systems an integral part of the standard through EN 62305-4. LEMP is the term given to the overall electromagnetic effects of lightning, including conducted surges (transient overvoltage and currents) and radiated electromagnetic field effects.\r\n\r\nEN 62305 \u2013 4 categorizes the source of damage, type of damage and the type of loss.\r\n\r\n<strong>Sources of damage<\/strong>\r\n\r\nDamage that can be caused by lightning is sub-divided into:\r\n<ul>\r\n \t<li>Damage to a structure (including all incoming electrical overhead and buried lines connected to the structure)<\/li>\r\n \t<li>Damage to a service (service in this instance being part of telecommunication, data, electrical supply, water, gas and fuel distribution networks).<\/li>\r\n<\/ul>\r\n<img class=\"wp-image-17873 size-medium aligncenter\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/11-400x271.png\" alt=\"\" width=\"400\" height=\"271\" \/>\r\n\r\n<strong>Types of damage<\/strong>\r\n\r\nEach source of damage may result in one or more of three types of damage. The possible types of damage are identified as follows:\r\n<ul>\r\n \t<li>D1 Injury of persons or livestock due to step and touch voltages<\/li>\r\n \t<li>D2 Physical damage (fire, explosion, mechanical destruction, chemical release) due to lightning current effects including sparking<\/li>\r\n \t<li>D3 Failure of internal systems due to Lightning Electromagnetic Impulse (LEMP).<\/li>\r\n<\/ul>\r\n<strong>Types of loss<\/strong>\r\n\r\nThe following types of loss may result from damage due to lightning:\r\n<ul>\r\n \t<li>L1 Loss of human life<\/li>\r\n \t<li>L2 Loss of service to the public<\/li>\r\n \t<li>L3 Loss of cultural heritage<\/li>\r\n \t<li>L4 Loss of economic value<\/li>\r\n<\/ul>\r\nThe relationships of all of the above parameters:\r\n\r\nThe relationships of all of the above parameters:\r\n<table border=\"1\" cellspacing=\"0\">\r\n<tbody>\r\n<tr class=\"firstRow\">\r\n<td valign=\"top\" width=\"142\">Point of strike<\/td>\r\n<td valign=\"top\" width=\"142\">Source of\u00a0damage<\/td>\r\n<td valign=\"top\" width=\"142\">Type of\u00a0damage<\/td>\r\n<td valign=\"top\" width=\"142\">Type of\u00a0loss<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Structure<\/td>\r\n<td valign=\"top\" width=\"142\">S1<\/td>\r\n<td valign=\"top\" width=\"142\">D1&nbsp;\r\n\r\nD2\r\n\r\nD3<\/td>\r\n<td valign=\"top\" width=\"142\">L1, L4**&nbsp;\r\n\r\nL1, L2, L3, L4\r\n\r\nL1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Near a\u00a0Structure<\/td>\r\n<td valign=\"top\" width=\"142\">S2<\/td>\r\n<td valign=\"top\" width=\"142\">D3<\/td>\r\n<td valign=\"top\" width=\"142\">L1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Service connected\u00a0to the structure<\/td>\r\n<td valign=\"top\" width=\"142\">S3<\/td>\r\n<td valign=\"top\" width=\"142\">D1&nbsp;\r\n\r\nD2\r\n\r\nD3<\/td>\r\n<td valign=\"top\" width=\"142\">L1,L4**&nbsp;\r\n\r\nL1, L2, L3, L4\r\n\r\nL1*, L2, L4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Near a service<\/td>\r\n<td valign=\"top\" width=\"142\">S4<\/td>\r\n<td valign=\"top\" width=\"142\">D3<\/td>\r\n<td valign=\"top\" width=\"142\">L1*, L2, L4<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n* Only for structures with risk of explosion and for hospitals or other structures where failures of internal systems immediately endangers human life.\r\n\r\n** Only for properties where animals may be lost.\r\n\r\nLEMP damage is so prevalent that it is identified as one of the specific types (D3) against which protection should be provided and can occur from ALL strike points to the structure or connected services \u2013 direct or indirect. This extended approach also takes into account the danger of fire or explosion associated with services connected to the structure, e.g. power, telecoms and other metallic lines.\r\n\r\nEN 62305 makes it clear that structural lightning protection must no longer be considered in isolation from transient overvoltage\/surge protection and given that lightning from all strikes points, direct or indirect, to the structure or connected services creates a risk from transients, SPDs are a vital means of protection whether structural lightning protection is present or not.\r\n\r\n<strong>Current and voltage waveforms<\/strong>\r\n\r\nEN 62305 takes account of protection measures on metallic service lines (typically power, signal and telecom lines) using transient overvoltage or Surge Protection Devices (SPDs) against both direct lightning strikes as well as the more common indirect lightning strikes and switching transients. Standards such as the EN 61643 series define the characteristics of lightning currents and voltages to enable reliable and repeatable testing of SPDs (as well as lightning protection components). Although these waveforms may differ from actual transients, the standardized forms are based upon years of observation and measurement (and in some cases simulation). In general they provide a fair approximation of the real world transient.\r\n\r\nTransient waveforms have a fast rising edge and a longer tail. They are described through their peak value (or magnitude), rise time and their duration (or fall time). The duration is measured as the time taken for the test transient to decay to half its peak value.\r\n\r\nThe figures below illustrate the common current and voltage waveforms that are used to test SPDs for mains, signal and telecom lines.\r\n\r\n<img class=\"wp-image-17874 size-medium aligncenter\" src=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-400x239.png\" sizes=\"(max-width: 400px) 100vw, 400px\" srcset=\"https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-400x239.png 400w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-768x459.png 768w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-600x358.png 600w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12-150x90.png 150w, https:\/\/www.britecelectric.com\/wp-content\/uploads\/2023\/12\/12.png 1147w\" alt=\"\" width=\"400\" height=\"239\" \/>\r\n\r\n<strong>Direct strikes<\/strong>\r\n\r\nDirect lightning can inject partial lightning currents of the 10\/350\u03bcs waveform into a system where a structure with a structural Lightning Protection System receives a direct strike (Source S1) or where lightning directly strikes an overhead service line (Source S3).\r\n\r\n<strong>Indirect strikes<\/strong>\r\n\r\nRemote or indirect lightning flashes near the structure (Source S2) or near a connected service to the structure (Source S4) of up to 1km radius away (and hence far more common) are represented by the 8\/20\u03bcs waveform. Induced surges from direct lightning flashes and switching sources are also represented by this waveform. With a much shorter decay or fall time relative to the 10\/350\u03bcs waveform, the 8\/20\u03bcs waveform presents significantly less energy (for an equivalent peak current) but is still devastating enough to damage electrical and electronic equipment.\r\n\r\nEN 62305-1 recognizes that failure of internal systems (Damage Type D3) due to Lightning Electromagnetic Impulse (LEMP) is possible from all points of strike to the structure or service \u2013 direct or indirect (all Sources: S1, S2, S3 and S4).\r\n\r\n<strong>Surge Protection Measures (SPM)<\/strong>\r\n\r\nEN 62305-4 describes a number of measures to minimize the severity of transient overvoltage caused by lightning and electrical switching.\r\n\r\nKey and basic protection measures are:\r\n<ul>\r\n \t<li>Earthing and bonding<\/li>\r\n \t<li>Electromagnetic shielding and line routing<\/li>\r\n \t<li>Coordinated Surge Protective Devices<\/li>\r\n<\/ul>\r\nFurther additional protection measures include:\r\n<ul>\r\n \t<li>Extensions to the structural LPS<\/li>\r\n \t<li>Equipment location<\/li>\r\n \t<li>Use of fiber optic cables (protection by isolation)<\/li>\r\n<\/ul>\r\nSPMs also have to operate within and withstand the environment in which they are located considering factors such as temperature, humidity, vibration, voltage and current.\r\n\r\nSelection of the most suitable SPM is made using the risk assessment in accordance with EN 62305-2 taking into account both technical and economic factors. For example, it may not be practical or cost effective to implement electromagnetic shielding measures in an existing structure so the use of coordinated SPDs may be more suitable. Ideally SPDs are best incorporated at the project design stage, although they can also be readily installed in existing installations.\r\n\r\nTo ensure continuous operation of critical systems even in the event of a direct strike, SPDs are essential and these must be suitably deployed, based on the source of surge and its intensity using the Lightning Protection Zones (LPZ) concept within EN 62305-4.\r\n\r\n<strong>The Lightning Protection Zone (LPZ) concept<\/strong>\r\n\r\nProtection against LEMP is based on a concept of the Lightning Protection Zone (LPZ) that divides the structure in question into a number of zones according to the level of threat posed by the LEMP. The general idea is to identify or create zones within the structure where there is less exposure to some or all of the effects of lightning and to coordinate these with the immunity characteristics of the electrical or electronic equipment installed within the zone. Successive zones are characterized by significant reductions in LEMP severity as a result of bonding, shielding or the use of SPDs.\r\n\r\n<strong>External zones:<\/strong>\r\n<ul>\r\n \t<li>LPZ 0A is the area subject to direct lightning strokes and therefore may have to carry up to the full lightning current. This is typically the roof area of a structure without structural lightning protection. The full electromagnetic field occurs here.<\/li>\r\n \t<li>LPZ 0B is the area not subject to direct lightning strokes and is typically the sidewalls of a structure or a roof with structural lightning protection. However the full electromagnetic field still occurs here and conducted partial or induced lightning currents and switching surges can occur here.<\/li>\r\n<\/ul>\r\n<strong>Internal zones:<\/strong>\r\n<ul>\r\n \t<li>LPZ 1 is the internal area that is subject to partial lightning currents. The conducted lightning currents and\/or switching surges are reduced compared with the external zones LPZ 0A, LPZ 0B as is the electromagnetic field if suitable shielding measures are employed. This is typically the area where services enter the structure or where the main power switchboard is located.<\/li>\r\n \t<li>LPZ 2 is an internal area that is further located inside the structure where the remnants of lightning impulse currents and\/or switching surges are reduced compared with LPZ 1. Similarly the electromagnetic field is further reduced if suitable shielding measures are employed. This is typically a screened room or, for mains power at the sub-distribution board area.<\/li>\r\n<\/ul>"},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog\/791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/media\/792"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/media?parent=791"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/sv\/wp-json\/wp\/v2\/blog_category?post=791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}