{"id":3354,"date":"2023-01-04T16:36:56","date_gmt":"2023-01-04T15:36:56","guid":{"rendered":"https:\/\/www.gt-engineering.it\/normative-tecniche\/%tipologia_normativa%\/6-detection-zone-orthogonal-to-the-direction-of-approach\/"},"modified":"2025-07-18T11:12:36","modified_gmt":"2025-07-18T10:12:36","slug":"6-detection-zone-orthogonal-to-the-direction-of-approach","status":"publish","type":"normativa_tecnica","link":"https:\/\/www.gt-engineering.it\/en\/technical-standards\/en-iso-standards\/en-iso-13855\/6-detection-zone-orthogonal-to-the-direction-of-approach\/","title":{"rendered":"8 – Orthogonal approach to a detection zone"},"content":{"rendered":"\n\n \n \n \n
\n\n \n \n \n
\n \n
\n

The standard refers to two different situations regarding the detection zone orthogonal to the approach zone:<\/p>\n

    \n
  • Reaching into a safeguarded space toward a hazard zone<\/li>\n
  • Reaching out of a safeguarded space toward an SRMCD<\/li>\n<\/ul>\n<\/div> <\/div>\n \n \n
    <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
    \n\n \n
    \n \n
    \n \n \n

    \n Reaching Over <\/h2>\n <\/div>\n <\/div>\n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
    \n \n
    \n

    In the first case, an additional distance DDO<\/sub><\/strong> is used to prevent undetected access, and the equation for calculating the minimum separation distance between the barrier and the hazardous zone becomes:<\/p>\n

    S = (K \u00d7 T) + DDO<\/sub> + Z<\/strong><\/p>\n

    \u00a0<\/strong><\/p>\n

    The value of DDO<\/sub><\/strong> can be obtained from the Table 2<\/strong> when the height of the electrosensitive safeguard is fixed and the height of the hazard with respect to the reference plane is known.<\/p>\n<\/div> <\/div>\n \n \n

    <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n\n\n\n\n \n \n \n
    \n\n \n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
    \n \n
    \n

    In the second case, it can be possible to gain support on the protective structure when reaching over the detection zone. The separation distance S shall not be less than the reaching distance over a protective structure DGO<\/sub><\/strong> determined according to the standard ISO 13857:2019<\/strong>, 4.2.2, Table 2.<\/p>\n<\/div> <\/div>\n \n \n

    <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
    \n\n \n
    \n \n
    \n \n \n

    \n Reaching Through <\/h2>\n <\/div>\n <\/div>\n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
    \n \n
    \n

    The separation distance is calculated with the following equation:<\/p>\n

    S <\/em>= (K <\/em>\u00d7 T<\/em>) + D<\/em>DT<\/sub> + Z\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/em><\/strong><\/p>\n<\/div> <\/div>\n \n \n

    <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
    \n\n \n \n \n
    \n \n
    \n
    Case: de<\/sub> \u2264 40 [mm]<\/strong><\/em><\/div>\n
      \n
    • K=2000 [mm\/s] \u00a0 \u00a0&\u00a0 \u00a0 DDT<\/sub>=8\u2219(de<\/sub>-14)<\/li>\n<\/ul>\n
      If the calculation results in S > 500 [mm], then:<\/div>\n
        \n
      • K=1600 [mm\/s] \u00a0 \u00a0&\u00a0 \u00a0 DDT<\/sub>=8\u2219(de<\/sub>-14)<\/li>\n<\/ul>\n
        And the separation distance must be at least S \u2265 100 [mm].<\/div>\n<\/div> <\/div>\n \n \n
        <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
        \n\n \n \n \n
        \n \n
        \n
        Case: 40 [mm] \u2264 de<\/sub> \u2264 55 [mm]<\/strong><\/em><\/div>\n
          \n
        • K=2000 [mm\/s] \u00a0 \u00a0&\u00a0 \u00a0 DDT<\/sub>=208+12\u2219(de<\/sub>-40)<\/li>\n<\/ul>\n
          If the calculation results in S > 500 [mm], then:<\/div>\n
            \n
          • K=1600 [mm\/s] \u00a0 \u00a0&\u00a0 \u00a0 DDT<\/sub>=208+12\u2219(de<\/sub>-40)<\/li>\n<\/ul>\n
            And the separation distance must be at least S \u2265 500 [mm].<\/div>\n<\/div> <\/div>\n \n \n
            <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
            \n\n \n \n \n \n \n
            <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
            \n\n \n \n \n
            \n \n
            \n
            Case: 55 [mm] \u2264 de<\/sub> \u2264 120 [mm]<\/strong><\/em><\/div>\n
              \n
            • K=1600 [mm\/s] \u00a0 \u00a0&\u00a0 \u00a0 DDT<\/sub>=850 [mm]<\/li>\n<\/ul>\n<\/div> <\/div>\n \n \n
              <\/div>\n \n\n <\/div>\n <\/section>\n\n \n\n\n\n\n \n \n \n
              \n\n \n
              \n \n
              \n \n \n

              \n Reaching Under <\/h2>\n <\/div>\n <\/div>\n \n \n \r\n\r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n \r\n <\/picture>\r\n\r\n \r\n\r\n \r\n \r\n <\/div>\n \n
              \n \n
              \n

              The following values are considered to prevent inadvertent undetected access to hazard zones when reaching under a detection zone in an orthogonal approach. These values cannot always prevent intentional undetected access.
              \nThe maximum height of the lower edge of the detection zone from the reference plane HDB<\/sub> shall not exceed 300 [mm], HDB <\/sub>\u2264 300 [mm]<\/strong>. Instead, the separation distance S from the detection zone to the hazard zone shall be calculated according to the following equation:<\/p>\n

              S <\/em>= (K <\/em>\u00d7 T<\/em>) + D<\/em>DU<\/sub> + Z\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/em><\/strong><\/p>\n

              Where:
              \nK=1600 [mm\/s]
              \nDDU<\/sub>=8\u2219(de<\/sub>+HDB<\/sub>-14)+Z<\/em>\u00a0 and never < 0 [mm]<\/p>\n<\/div> <\/div>\n \n \n

              <\/div>\n \n\n <\/div>\n <\/section>\n\n \n","protected":false},"excerpt":{"rendered":"

              The minimum distance to the hazard zone shall be calculated by using the general Equation: 
              \n                  …<\/p>\n","protected":false},"author":1,"featured_media":48601,"parent":3218,"menu_order":2,"template":"","meta":{"_acf_changed":false,"footnotes":""},"normative-tecniche":[57],"class_list":["post-3354","normativa_tecnica","type-normativa_tecnica","status-publish","has-post-thumbnail","hentry","tipologia_normativa-en-iso-standards"],"acf":{"sottotitolo":"","allegati":null},"yoast_head":"\n6.2 - Detection zone orthogonal to the direction of approach<\/title>\n<meta name=\"description\" content=\"The minimum distance to the hazard zone shall be calculated by using the general Equation:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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