{"id":8685,"date":"2024-11-05T08:55:00","date_gmt":"2024-11-05T07:55:00","guid":{"rendered":"https:\/\/www.idro-elettrica.it\/esperto-risponde\/firebox-confined-conductive-areas-doubts-resolved\/"},"modified":"2026-07-01T09:46:57","modified_gmt":"2026-07-01T07:46:57","slug":"firebox-confined-conductive-areas-doubts-resolved","status":"publish","type":"esperto-risponde","link":"https:\/\/www.idro-elettrica.it\/en\/esperto-risponde\/firebox-confined-conductive-areas-doubts-resolved\/","title":{"rendered":"FIREBOX: Confined Conductive Areas\u2014Doubts Resolved"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>FIREBOX: Confined Spaces<\/em> is a question that often comes up when discussing fire-rated compartments with metal load-bearing structures. Here you\u2019ll find a clear and practical answer, including the criteria and practical implications for those working inside. <\/p>\n\n<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>Table of Contents<\/h2><nav><ul><li class=\"\"><a href=\"#che-cosa-sono-i-luoghi-conduttori-ristretti-lcr\">What Are \u201cRestricted Conductive Regions\u201d (LCR)?<\/a><\/li><li class=\"\"><a href=\"#quando-un-luogo-e-conduttore-ristretto-i-criteri\">When a Place Is a \u201cHigh-Risk Venue\u201d: The Criteria<\/a><\/li><li class=\"\"><a href=\"#esempi-tipici-di-luoghi-conduttori-ristretti\">Typical examples of narrow conductive areas<\/a><\/li><li class=\"\"><a href=\"#firebox-e-luoghi-conduttori-ristretti-quando-non-si-parla-di-lcr\">FIREBOX and \u201crestricted conductive areas\u201d: when we\u2019re NOT talking about LCR<\/a><\/li><li class=\"\"><a href=\"#cosa-cambia-per-la-sicurezza-elettrica-regole-generali-vs-misure-specifiche\">What&#8217;s Changing in Electrical Safety: General Rules vs. Specific Measures<\/a><\/li><li class=\"\"><a href=\"#quali-misure-sono-previste-negli-lcr-selv-e-separazione-elettrica\">What measures are specified in the LCR (SELV and electrical isolation)?<\/a><\/li><li class=\"\"><a href=\"#conclusione-tecnica-i-firebox-non-sono-lcr-e-cosa-comporta\">Technical Conclusion: FIREBOX devices are not LCR (and what that means)<\/a><\/li><li class=\"\"><a href=\"#formazione-e-qualifiche-per-operare-in-un-firebox-pes-pav-pei\">Training and Qualifications for Operating a FIREBOX (PES, PAV, PEI)<\/a><\/li><li class=\"\"><a href=\"#conclusione\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2 id=\"che-cosa-sono-i-luoghi-conduttori-ristretti-lcr\" class=\"wp-block-heading\">What Are \u201cRestricted Conductive Areas\u201d (RCA)?<\/h2>\n\n<p class=\"wp-block-paragraph\">\u201cConfined conductive areas\u201d (LCR) are addressed in <strong>CEI 64-8\/7, Section 706<\/strong>, and are referenced in <strong>the CEI 64-17 Guide<\/strong> on the installation of electrical systems at construction sites.<\/p>\n\n<p class=\"wp-block-paragraph\">In practice, the term \u201cLCR\u201d is used when the environment\u2014due to its materials and dimensions\u2014increases the likelihood and duration of bodily contact with conductive parts, thereby making the electrical hazard more critical.<\/p>\n\n<h2 id=\"quando-un-luogo-e-conduttore-ristretto-i-criteri\" class=\"wp-block-heading\">When a Place Is a \u201cHigh-Risk Venue\u201d: The Criteria<\/h2>\n\n<p class=\"wp-block-paragraph\">A place is defined as a confined space when the following conditions are met:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>It is bounded by metal or conductive surfaces<\/strong>.<\/li>\n\n\n\n<li><strong>Its size is such that it restricts the operator&#8217;s movement<\/strong> and is likely to come into contact with large parts of the body (other than the hands and feet).<\/li>\n\n\n\n<li><strong>The ability to interrupt such contact is limited<\/strong>.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">These three elements must be considered together: it is not enough for there to simply \u201cbe metal present\u201d; it also matters how much the space constrains the operator and how realistic it is that the contact would be prolonged and difficult to break.<\/p>\n\n<h2 id=\"esempi-tipici-di-luoghi-conduttori-ristretti\" class=\"wp-block-heading\">Typical examples of narrow conductive areas<\/h2>\n\n<p class=\"wp-block-paragraph\">The following are considered confined conductive spaces, for example:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>cisterns or small metal tanks<\/strong>;<\/li>\n\n\n\n<li><strong>inside metal pipes<\/strong>;<\/li>\n\n\n\n<li><strong>metal or damp tunnels<\/strong>;<\/li>\n\n\n\n<li><strong>limited excavation of the ground<\/strong>;<\/li>\n\n\n\n<li><strong>cavities within non-insulated structures<\/strong>, large enough that anyone entering them to work is <strong>in constant contact<\/strong> with the walls.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">These examples help illustrate the logic: the operator is \u201cconfined\u201d in the space, and contact with conductive surfaces is likely, extensive, and prolonged.<\/p>\n\n<h2 id=\"firebox-e-luoghi-conduttori-ristretti-quando-non-si-parla-di-lcr\" class=\"wp-block-heading\">FIREBOX and \u201crestricted conductive areas\u201d: when we\u2019re NOT talking about LCR<\/h2>\n\n<p class=\"wp-block-paragraph\">In general, the following are <strong>NOT<\/strong> considered confined spaces:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>FIREBOX-type prefabricated structures<\/strong>;<\/li>\n\n\n\n<li><strong>metal scaffolding<\/strong>;<\/li>\n\n\n\n<li><strong>the major platforms<\/strong>;<\/li>\n\n\n\n<li><strong>the large metal silos<\/strong>.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">This point is at the heart of the matter: even if a space contains metal elements, that does not automatically make it an LCR. If the conditions of a \u201cconfined space\u201d and extended, difficult-to-interrupt contact are not met, the space does not fall under the definition of a confined conductive space. <\/p>\n\n<h2 id=\"cosa-cambia-per-la-sicurezza-elettrica-regole-generali-vs-misure-specifiche\" class=\"wp-block-heading\">What&#8217;s Changing in Electrical Safety: General Rules vs. Specific Measures<\/h2>\n\n<p class=\"wp-block-paragraph\">When you are <strong>not<\/strong> in an LCR (for example, in <strong>FIREBOX units<\/strong>), simply follow <strong>the general rules for electrical safety<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">The practical consequence, put simply, is this: if FIREBOX units are not \u201cconfined conductive spaces,\u201d <strong>it is not necessary to follow the specific protective measures against direct and indirect electrical contact required for LCRs<\/strong>.<\/p>\n\n<h2 id=\"quali-misure-sono-previste-negli-lcr-selv-e-separazione-elettrica\" class=\"wp-block-heading\">What measures are specified in the LCR (SELV and electrical isolation)?<\/h2>\n\n<p class=\"wp-block-paragraph\">Specific protective measures against direct and indirect contact are provided for LCRs in the circuits they power:<\/p>\n\n<p class=\"wp-block-paragraph\">a) <strong>portable tools<\/strong> and measuring instruments or other transportable or movable components<br\/>b) <strong>portable lamps<\/strong><br\/>c) <strong>fixed electrical components<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">In LCR circuits, protection against direct and indirect contact can be achieved by means of:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>SELV (Safety Extra-Low Voltage) circuits<\/strong>: circuits operating at a supply voltage (between phase and ground) <strong>of less than 50 V AC<\/strong> or <strong>less than 120 V DC<\/strong>;<\/li>\n\n\n\n<li><strong>Electrical isolation<\/strong>: achieved by using <strong>an isolation transformer<\/strong> between the power grid and the electrical appliance.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">If, on the other hand, you are in a FIREBOX (which, as noted above, is <strong>not<\/strong> an LCR), the operational conclusion is that <strong>neither safety transformers nor isolation transformers are necessary,<\/strong> as these are \u201cLCR-specific\u201d measures.<\/p>\n\n<h2 id=\"conclusione-tecnica-i-firebox-non-sono-lcr-e-cosa-comporta\" class=\"wp-block-heading\">Technical Conclusion: FIREBOX devices are not LCR (and what that means)<\/h2>\n\n<p class=\"wp-block-paragraph\">To summarize the key points:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>The definition of LCR requires <strong>a confined space + probable or prolonged contact + difficulty in breaking off contact<\/strong>;<\/li>\n\n\n\n<li>Examples of environments that are <strong>generally not<\/strong> LCR include <strong>prefabricated structures such as FIREBOX<\/strong>;<\/li>\n\n\n\n<li>Therefore, <strong>FIREBOXes<\/strong> are <strong>not<\/strong> \u201cconfined conductive spaces\u201d (LCR);<\/li>\n\n\n\n<li>Consequently, <strong>it is not necessary<\/strong> to implement specific LCR measures (such as safety or isolation transformers) simply because the equipment is operating in a FIREBOX.<\/li>\n<\/ul>\n\n<h2 id=\"formazione-e-qualifiche-per-operare-in-un-firebox-pes-pav-pei\" class=\"wp-block-heading\">Training and Qualifications for Operating a FIREBOX (PES, PAV, PEI)<\/h2>\n\n<p class=\"wp-block-paragraph\">However, there is one aspect that should not be overlooked: the FIREBOX contains <strong>electrical systems and electromechanical components<\/strong> that must be connected to the power grid in order to function.<\/p>\n\n<p class=\"wp-block-paragraph\">Operators assigned to work inside the FIREBOX, <strong>in presence or absence of power<\/strong>, must be properly trained. Please note that: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>The employer is required to provide all workers with adequate training to ensure full compliance with safety rules and to prevent serious or fatal accidents;<\/li>\n\n\n\n<li><strong>CEI 11-27<\/strong> defines the minimum training requirements for various roles.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">The figures shown are:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Qualified Person (PES):<\/strong> capable of performing electrical work on live circuits.<\/li>\n\n\n\n<li><strong>Trained Person (PAV):<\/strong> May perform work near live parts.<\/li>\n\n\n\n<li><strong>Qualified Person (PEI):<\/strong> performs work on de-energized equipment and in the vicinity of electrical hazards.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">In addition,  <strong>Legislative Decree 81\/08<\/strong> <strong>CEI 11-27<\/strong> stipulates that electrical work on live parts or parts that are temporarily de-energized must be performed by qualified personnel who are aware of the hazards associated with electrical risks and who meet the requirements for working on live parts.<\/p>\n\n<h2 id=\"conclusione\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n<p class=\"wp-block-paragraph\">FIREBOX units generally do not fall under the definition of \u201cconfined conductive spaces\u201d; this means that the general electrical safety rules apply, rather than the specific measures required for confined conductive spaces. In any case, the <strong>training and qualification<\/strong> of personnel working inside these units remain essential. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>FIREBOX Confined Spaces: A Practical Guide to Determining When an Area Falls Under the Definition of a Confined Space and When It Does Not. Let\u2019s examine the criteria, examples, and implications for safety measures and staff training. <\/p>\n","protected":false},"featured_media":8687,"parent":0,"template":"","meta":{"_acf_changed":false,"_angie_page":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"tags":[1099,580,1102,1098,858,1097,1101,1100,1096,1103],"class_list":["post-8685","esperto-risponde","type-esperto-risponde","status-publish","has-post-thumbnail","hentry","tag-cei-11-27","tag-cei-64-8","tag-electrical-construction-sites","tag-electrical-safety","tag-firebox","tag-lcr","tag-legislative-decree-81-08","tag-pes-pav-pei","tag-restricted-conductive-areas","tag-workplace-safety-training"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde\/8685","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde"}],"about":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/types\/esperto-risponde"}],"version-history":[{"count":0,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/esperto-risponde\/8685\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/media\/8687"}],"wp:attachment":[{"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/media?parent=8685"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.idro-elettrica.it\/en\/wp-json\/wp\/v2\/tags?post=8685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}