{"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\/de\/blog\/en-62305-protection-against-lightning\/","title":{"rendered":"EN 62305 Schutz vor Blitzschlag"},"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>Schadensquellen<\/strong>\r\n\r\nSch\u00e4den, die durch Blitzschlag verursacht werden k\u00f6nnen, werden unterteilt in:\r\n<ul>\r\n \t<li>Sch\u00e4den an einem Bauwerk (einschlie\u00dflich aller eingehenden elektrischen Freileitungen und Erdleitungen, die mit dem Bauwerk verbunden sind)<\/li>\r\n \t<li>Sch\u00e4den an einer Dienstleistung (in diesem Fall eine Dienstleistung, die Teil von Telekommunikations-, Daten-, Stromversorgungs-, Wasser-, Gas- und Kraftstoffverteilungsnetzen ist).<\/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>Schadensarten<\/strong>\r\n\r\nJede Schadensquelle kann zu einer oder mehreren von drei Schadensarten f\u00fchren. Die m\u00f6glichen Schadensarten werden wie folgt identifiziert:\r\n<ul>\r\n \t<li>D1 Verletzung von Personen oder Nutztieren durch Tritt- und Ber\u00fchrungsspannungen<\/li>\r\n \t<li>D2 Physischer Schaden (Brand, Explosion, mechanische Zerst\u00f6rung, Freisetzung chemischer Stoffe) durch Blitzstromeinwirkung einschlie\u00dflich Funkenbildung<\/li>\r\n \t<li>D3 Ausfall interner Systeme aufgrund eines elektromagnetischen Blitzimpulses (LEMP).<\/li>\r\n<\/ul>\r\n<strong>Arten von Verlusten<\/strong>\r\n\r\nDurch Blitzsch\u00e4den k\u00f6nnen folgende Schadensarten entstehen:\r\n<ul>\r\n \t<li>L1 Verlust von Menschenleben<\/li>\r\n \t<li>L2 Verlust des Dienstes f\u00fcr die \u00d6ffentlichkeit<\/li>\r\n \t<li>L3 Verlust des kulturellen Erbes<\/li>\r\n \t<li>L4 Verlust des wirtschaftlichen Wertes<\/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\">Angriffspunkt<\/td>\r\n<td valign=\"top\" width=\"142\">Schadensquelle<\/td>\r\n<td valign=\"top\" width=\"142\">Art des Schadens<\/td>\r\n<td valign=\"top\" width=\"142\">Art des Verlusts<\/td>\r\n<\/tr>\r\n<tr>\r\n<td valign=\"top\" width=\"142\">Struktur<\/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\">In der N\u00e4he einer 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\">Mit der Struktur verbundener Dienst<\/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\">In der N\u00e4he eines Gottesdienstes<\/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>Strom- und Spannungswellenformen<\/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>Direkte Schl\u00e4ge<\/strong>\r\n\r\nDirekter Blitz kann Teilblitzstr\u00f6me der Wellenform 10\/350 \u03bcs in ein System einspeisen, in dem eine Struktur mit einem strukturellen Blitzschutzsystem einen direkten Einschlag erh\u00e4lt (Quelle S1) oder in dem ein Blitz direkt in eine Freileitung einschl\u00e4gt (Quelle S3).\r\n\r\n<strong>Indirekte Streiks<\/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>\u00dcberspannungsschutzma\u00dfnahmen (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>Erdung und Verbindung<\/li>\r\n \t<li>Elektromagnetische Abschirmung und Leitungsf\u00fchrung<\/li>\r\n \t<li>Koordinierte \u00dcberspannungsschutzger\u00e4te<\/li>\r\n<\/ul>\r\nWeitere zus\u00e4tzliche Schutzma\u00dfnahmen sind:\r\n<ul>\r\n \t<li>Erweiterungen des strukturellen LPS<\/li>\r\n \t<li>Standort der Ausr\u00fcstung<\/li>\r\n \t<li>Einsatz von Glasfaserkabeln (Schutz durch 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>Das Lightning Protection Zone (LPZ)-Konzept<\/strong>\r\n\r\nDer Schutz vor LEMP basiert auf dem Konzept der Lightning Protection Zone (LPZ), das das betreffende Bauwerk entsprechend der Gef\u00e4hrdungsstufe des LEMP in mehrere Zonen unterteilt. Die allgemeine Idee besteht darin, Zonen innerhalb der Struktur zu identifizieren oder zu schaffen, in denen einige oder alle Auswirkungen von Blitzen weniger stark ausgesetzt sind, und diese mit den Immunit\u00e4tseigenschaften der in der Zone installierten elektrischen oder elektronischen Ger\u00e4te zu koordinieren. Aufeinanderfolgende Zonen sindgekennzeichnet durch eine deutliche Verringerung des LEMP-Schweregrads durch Bonden, Abschirmen oder den Einsatz von SPDs.\r\n\r\n<strong>Externe Zonen:<\/strong>\r\n<ul>\r\n \t<li>LPZ 0A ist der Bereich, der direkten Blitzeinschl\u00e4gen ausgesetzt ist und daher m\u00f6glicherweise den vollen Blitzstrom tragen muss. Dies ist typischerweise die Dachfl\u00e4che eines Bauwerks ohne baulichen Blitzschutz. Hier tritt das gesamte elektromagnetische Feld auf.<\/li>\r\n \t<li>LPZ 0B ist der Bereich, der keinem direkten Blitzeinschlag ausgesetzt ist und typischerweise die Seitenw\u00e4nde einer Struktur oder eines Daches mit baulichem Blitzschutz umfasst. Allerdings tritt hier immer noch das volle elektromagnetische Feld auf und es k\u00f6nnen hier leitungsgebundene partielle oder induzierte Blitzstr\u00f6me und Schalt\u00fcberspannungen auftreten.<\/li>\r\n<\/ul>\r\n<strong>Interne Zonen:<\/strong>\r\n<ul>\r\n \t<li>LPZ 1 ist der interne Bereich, der teilweisen Blitzstr\u00f6men ausgesetzt ist. Im Vergleich zu den Au\u00dfenzonen LPZ 0A, LPZ 0B reduzieren sich die leitungsgebundenen Blitzstr\u00f6me bzw. Schalt\u00fcberspannungen und bei Verwendung geeigneter Abschirmma\u00dfnahmen auch das elektromagnetische Feld. Dies ist in der Regel der Bereich, in dem die Versorgungsleitungen in das Bauwerk eingef\u00fchrt werden oder in dem sich die Hauptstromschalttafel befindet.<\/li>\r\n \t<li>Bei der LPZ 2 handelt es sich um einen Innenbereich, der sich weiter innerhalb der Struktur befindet und in dem die Reste von Blitzsto\u00dfstr\u00f6men und\/oder Schalt\u00fcberspannungen im Vergleich zur LPZ 1 reduziert sind. Ebenso wird das elektromagnetische Feld weiter reduziert, wenn geeignete Abschirmma\u00dfnahmen eingesetzt werden. Dies ist typischerweise ein abgeschirmter Raum oder f\u00fcr die Netzstromversorgung der Unterverteilerbereich.<\/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\/de\/wp-json\/wp\/v2\/blog\/791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/de\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/de\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/de\/wp-json\/wp\/v2\/media\/792"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/de\/wp-json\/wp\/v2\/media?parent=791"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/de\/wp-json\/wp\/v2\/blog_category?post=791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}