{"id":671,"date":"2026-08-26T13:24:41","date_gmt":"2026-08-26T11:24:41","guid":{"rendered":"https:\/\/www.safety-services.at\/?page_id=671"},"modified":"2026-10-01T14:32:49","modified_gmt":"2026-10-01T12:32:49","slug":"sicherheitsabstand-berechnen","status":"publish","type":"page","link":"https:\/\/www.safety-services.at\/en\/sicherheitsabstand-berechnen\/","title":{"rendered":"Safety Distance under EN ISO 13855"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">This calculator determines the required safety distances <a href=\"https:\/\/www.iso.org\/standard\/73728.html\" target=\"_blank\" rel=\"noopener\">EN ISO 13855<\/a> (approach speed and detection capability of protective equipment) sets for the design of safeguarding.<\/p>\n\n\n\n<!-- ============================================================\n     Landingpage-Text: Sicherheitsabstand nach EN ISO 13855\n     Ziel-URL:  https:\/\/www.safety-services.at\/sicherheitsabstand-berechnen\/\n     Einf\u00fcgen in WordPress: Block \"Individuelles HTML\".\n     Der Rechner wird an der markierten Stelle eingebettet.\n     Keine Inline-Styles \u2013 die Formatierung \u00fcbernimmt Ihr Theme.\n     ============================================================ -->\n\n<h2>Calculate Safety Distance under EN ISO 13855<\/h2>\n\n<p>A light curtain only protects if it is positioned far enough from the hazard point.\nThe standard EN&nbsp;ISO&nbsp;13855 specifies how to determine this distance: from the speed at\nwhich a person approaches the hazard point, from the time the safeguard and machine need to come\nto a stop, and from the distance a hand can penetrate into the protective field before it is\ndetected.<\/p>\n\n<p>Using the calculator below, you can determine the required safety distance for vertical and\nhorizontal protective fields, for multi-beam photoelectric safeguards, and for two-hand control\ndevices. You receive the full calculation, automatic notices on reaching over and reaching under,\nand a print-ready calculation sheet for your technical documentation.<\/p>\n\n<iframe id=\"rechner13855\" src=\"https:\/\/www.safety-services.at\/tools\/sicherheitsabstand-rechner.html\" title=\"Calculate safety distance under EN ISO 13855\" loading=\"lazy\" style=\"width:100%;border:0;height:2200px;display:block\"><\/iframe>\n<script>\nwindow.addEventListener(\"message\", function (e) {\n  if (e.data && e.data.type === \"4s-rechner-hoehe\") {\n    var f = document.getElementById(\"rechner13855\");\n    if (f) f.style.height = (e.data.height + 24) + \"px\";\n  }\n});\n<\/script>\n\n\n<h2>What the safety distance is for<\/h2>\n\n<p>Non-contact safeguards do not physically stop anyone. They trigger a stop signal \u2013 and time\npasses before the hazardous movement actually comes to a stop. During that time, the hand keeps\nmoving. The safety distance is precisely the distance that prevents the hand from reaching the\nhazard point before the movement has come to a standstill. It is therefore neither a rule of thumb\nnor a question of available space, but the calculated result of speed and time.<\/p>\n\n<h2>The basic formula: S = K \u00d7 T + C<\/h2>\n\n<p>All application cases of EN&nbsp;ISO&nbsp;13855 follow the same structure:<\/p>\n\n<p><strong>S = K \u00d7 T + C<\/strong><\/p>\n\n<h3>K \u2013 Approach speed<\/h3>\n\n<p>The standard uses two values. <strong>2000&nbsp;mm\/s<\/strong> applies to hand and arm movement\nover short distances, <strong>1600&nbsp;mm\/s<\/strong> to the approach of the whole body. For vertical\nprotective fields with a detection capability of up to 40&nbsp;mm, the calculation is first made with\n2000&nbsp;mm\/s. If this produces a distance above 500&nbsp;mm, it may be recalculated with\n1600&nbsp;mm\/s \u2013 but the result may not fall below 500&nbsp;mm. This switch is regularly overlooked\nin practice and leads to distances that are either unnecessarily large or impermissibly small.<\/p>\n\n<h3>T \u2013 Total time to standstill<\/h3>\n\n<p>T consists of the response time of the safeguard, including the evaluation unit, safety relay\nand control system, plus the machine&#8217;s stopping (overrun) time. The response time is given in the\ndatasheet; the stopping time is not: it must be measured \u2013 at the most unfavourable operating point,\nwith the largest tool mass and at the highest speed.<\/p>\n\n<h3>C \u2013 Penetration depth<\/h3>\n\n<p>The penetration depth describes how far a body part can penetrate the protective field without\nbeing detected. It depends on the detection capability: for a resolution of up to 40&nbsp;mm,\n<strong>C&nbsp;=&nbsp;8&nbsp;\u00d7&nbsp;(d&nbsp;\u2212&nbsp;14&nbsp;mm)<\/strong> applies; for coarser resolutions,\ndetection of the whole body is assumed and <strong>C&nbsp;=&nbsp;850&nbsp;mm<\/strong> is used. A light\ncurtain with a resolution of 30&nbsp;mm therefore already has a penetration depth of 128&nbsp;mm before\ntime even comes into play.<\/p>\n\n<h2>The four application cases at a glance<\/h2>\n\n<ul>\n  <li><strong>Vertical protective field, perpendicular approach<\/strong> \u2013 the classic light curtain on\n      presses, punching machines, loading stations and robot cells.<\/li>\n  <li><strong>Horizontal protective field, parallel approach<\/strong> \u2013 pressure-sensitive mats, low-level\n      protective fields and safety laser scanners. Here,\n      <strong>S&nbsp;=&nbsp;1600&nbsp;\u00d7&nbsp;T&nbsp;+&nbsp;(1200&nbsp;\u2212&nbsp;0.4&nbsp;\u00d7&nbsp;H)<\/strong>\n      applies; the protective field height H must not exceed 1000&nbsp;mm.<\/li>\n  <li><strong>Multi-beam and single-beam safeguards<\/strong> \u2013 access guards with beam heights fixed by\n      the standard: 750&nbsp;mm for a single beam, 400\/900&nbsp;mm for two, 300\/700\/1100&nbsp;mm for\n      three, and 300\/600\/900\/1200&nbsp;mm for four beams.<\/li>\n  <li><strong>Two-hand control device<\/strong> \u2013 <strong>S&nbsp;=&nbsp;1600&nbsp;\u00d7&nbsp;T&nbsp;+&nbsp;250&nbsp;mm<\/strong>,\n      but at least 100&nbsp;mm.<\/li>\n<\/ul>\n\n<h2>Five mistakes that most commonly occur in practice<\/h2>\n\n<ol>\n  <li><strong>The stopping time is estimated instead of measured.<\/strong> A value from the machine&#8217;s\n      manual applies to the as-delivered condition \u2013 not to a brake after five years of operation.<\/li>\n  <li><strong>No allowance for wear.<\/strong> Brakes get slower over time. An allowance added to the\n      measured total time is not a normative value, but in practice it is the difference between a\n      distance that remains correct for years and one that fails the next inspection.<\/li>\n  <li><strong>Reaching over is not assessed.<\/strong> A protective field whose upper edge is below\n      900&nbsp;mm can be reached over. EN&nbsp;ISO&nbsp;13857 must additionally be applied for this.<\/li>\n  <li><strong>Reaching under is not assessed.<\/strong> If the lower edge is above 300&nbsp;mm, there is a\n      path underneath the protective field.<\/li>\n  <li><strong>Presence within the hazard zone is overlooked.<\/strong> Multi-beam safeguards secure\n      access, not presence. Without a start-up and restart interlock that must be acknowledged from\n      outside the hazard zone, the result is a trap rather than a safeguard.<\/li>\n<\/ol>\n\n<h2>Measuring the stopping time correctly<\/h2>\n\n<p>The stopping time is the only variable in the formula that changes over the machine&#8217;s service\nlife. It must therefore not only be determined once at commissioning, but monitored during recurring\ninspections. It is measured with a stopping-time measuring device under the most unfavourable\noperating condition, several times, and the largest measured value is used. If the machine changes \u2013\na new tool, higher speed, a different brake \u2013 the measurement must be repeated and the safety\ndistance reassessed.<\/p>\n\n<h2>Frequently asked questions<\/h2>\n\n<h3>Which version of EN ISO 13855 applies?<\/h3>\n<p>Both: the calculator can be switched between EN&nbsp;ISO&nbsp;13855:2010 and ISO&nbsp;13855:2024.\nFor the presumption of conformity with the Machinery Directive, the 2010 version listed in the EU\nOfficial Journal is authoritative; at ISO level, however, it has been withdrawn since the 2024\nedition was published.<\/p>\n\n<p>The 2024 edition calculates according to <strong>S&nbsp;=&nbsp;(K&nbsp;\u00d7&nbsp;T)&nbsp;+&nbsp;D_DS&nbsp;+&nbsp;Z<\/strong>\nand considers reaching over, reaching through and the newly introduced reaching under separately;\nthe largest of the three values is authoritative. Three changes have the strongest practical impact:\nfor two-hand control devices, the reach distance increases from 250 to 550&nbsp;mm. For the horizontal\nprotective field, the height-dependent deduction is dropped, and the value is now uniformly\n1,200&nbsp;mm. And reaching under is practically never included in existing calculations. Anyone\nplanning today should cross-check both versions \u2013 that is exactly what the switch is for.<\/p>\n\n<h3>Does the calculated distance still apply after a modification?<\/h3>\n<p>No. Any intervention in the drive, brake, control system or tool changes the stopping time and\ntherefore the required distance. In the case of a substantial modification, it must additionally be\nchecked whether new CE marking is required.<\/p>\n\n<h3>What to do if the required distance cannot be implemented?<\/h3>\n<p>There are usually three options: shorten the stopping time (faster brake, direct shutdown),\nimprove the resolution of the safeguard, or change the protection concept \u2013 for example with an\ninterlocked guard or a combination of a protective field and an access guard. Which approach makes\neconomic sense is usually only revealed by the risk assessment.<\/p>\n\n<h3>Is the calculation sufficient as evidence?<\/h3>\n<p>It is one building block. Also to be demonstrated are the required Performance Level under\nEN&nbsp;ISO&nbsp;13849-1, validation of the measures implemented, and inclusion in the technical\ndocumentation. The calculator&#8217;s calculation sheet provides a traceable record of the calculation for\nthis purpose.<\/p>\n\n<h2>Support with implementation<\/h2>\n\n<p>If the calculated distance cannot be achieved by design, if the stopping time needs to be\nmeasured, or if it is unclear after a modification whether a new conformity assessment is required,\n4S&nbsp;\u2013&nbsp;Safety Services can support you. We prepare\n<a href=\"https:\/\/www.safety-services.at\/en\/risikobeurteilung\/\">risk assessments<\/a>, support\n<a href=\"https:\/\/www.safety-services.at\/ce-beratung\/\">CE conformity<\/a>, carry out\n<a href=\"https:\/\/www.safety-services.at\/validierung\/\">validation<\/a> after measures have been implemented, and\nprepare the <a href=\"https:\/\/www.safety-services.at\/dokumentation\/\">technical documentation<\/a>.<\/p>\n\n<p><a href=\"https:\/\/www.safety-services.at\/kontakt\/\"><strong>Have your situation reviewed \u2013 get in touch<\/strong><\/a><\/p>\n\n<p>4S \u2013 Sascha Steinkrau\u00df Safety Services e.U., 1230 Vienna \u00b7 <a href=\"mailto:4S@4S.at\">4S@4S.at<\/a> \u00b7 <a href=\"tel:+436649123780\">+43 664 9123780<\/a><\/p>\n\n<p><em>Note: The calculator supports the application of EN ISO 13855 and replaces neither the risk\nassessment nor case-by-case verification. Only the wording of the standard is authoritative.<\/em><\/p>\n\n\n<!-- ============================================================\n     Optional: strukturierte Daten f\u00fcr die Google-FAQ-Darstellung.\n     Nur einf\u00fcgen, wenn die Fragen oben unver\u00e4ndert auf der Seite stehen.\n     ============================================================ -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which version of EN ISO 13855 applies?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The calculator can be switched between EN ISO 13855:2010 and ISO 13855:2024. For the presumption of conformity with the Machinery Directive, the 2010 version listed in the EU Official Journal is authoritative; at ISO level it has been withdrawn since the 2024 edition was published. The 2024 edition calculates according to S = (K \u00d7 T) + D_DS + Z and considers reaching over, reaching through and the newly introduced reaching under separately. The strongest effects are: two-hand control devices increasing from 250 to 550 mm, the removal of the height-dependent deduction for the horizontal protective field, and reaching under, which was previously missing.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the calculated safety distance still apply after a modification?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. Any intervention in the drive, brake, control system or tool changes the stopping time and therefore the required distance. In the case of a substantial modification, it must additionally be checked whether new CE marking is required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What to do if the required safety distance cannot be implemented?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Possible options are a shorter stopping time, a finer resolution of the safeguard, or a modified protection concept, such as an interlocked guard or a combination of a protective field and an access guard. Which approach makes sense is shown by the risk assessment.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the calculation of the safety distance sufficient as evidence?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"It is one building block. Also to be demonstrated are the required Performance Level under EN ISO 13849-1, validation of the measures implemented, and inclusion in the technical documentation.\"\n      }\n    }\n  ]\n}\n<\/script>\n\n\n\n<p class=\"wp-block-paragraph\">Are you delivering machinery into German-speaking markets (Germany, Austria, Switzerland)? 4S can also act as your German-speaking point of contact on site and support the entire project from a safety-engineering perspective. Technical documents are prepared directly in German or English; a Spanish or Swedish version is translated on request.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This calculator determines the required safety distances EN ISO 13855 (approach speed and detection capability of protective equipment) sets for the design of safeguarding. Calculate Safety Distance under EN ISO 13855 A light curtain only protects if it is positioned far enough from the hazard point. The standard EN&nbsp;ISO&nbsp;13855 specifies how to determine this distance:&hellip;<\/p>\n<p class=\"more-link-wrapper\"><a class=\"more-link\" href=\"https:\/\/www.safety-services.at\/en\/sicherheitsabstand-berechnen\/\">Continue<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-671","page","type-page","status-publish","hentry"],"translation":{"provider":"WPGlobus","version":"3.0.6","language":"en","enabled_languages":["de","en","sv","es"],"languages":{"de":{"title":true,"content":true,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false},"sv":{"title":true,"content":true,"excerpt":false},"es":{"title":true,"content":true,"excerpt":false}}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Safety Distance to Guards: Free Calculator | 4S<\/title>\n<meta name=\"description\" content=\"Calculate safety distances to guards and light curtains under EN ISO 13855 free of charge \u2013 stopping time, approach speed, full calculation and a print-ready worksheet.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.safety-services.at\/sicherheitsabstand-berechnen\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Safety Distance to Guards: Free Calculator | 4S\" \/>\n<meta property=\"og:description\" content=\"Calculate safety distances to guards and light curtains under EN ISO 13855 free of charge \u2013 stopping time, approach speed, full calculation and a print-ready worksheet.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.safety-services.at\/sicherheitsabstand-berechnen\/\" \/>\n<meta property=\"og:site_name\" content=\"4S - 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