{"id":7602,"date":"2025-10-29T14:53:54","date_gmt":"2025-10-29T13:53:54","guid":{"rendered":"https:\/\/www.voltwork.fr\/?p=7602"},"modified":"2026-03-23T09:21:37","modified_gmt":"2026-03-23T08:21:37","slug":"voltage-absence-test-procedure","status":"publish","type":"post","link":"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/","title":{"rendered":"How to Perform a VAT: Complete Voltage Absence Test Procedure"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The <strong>Voltage Absence Test (VAT)<\/strong> is an essential step for securing any intervention on an electrical installation. It follows 3 steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Initial test of the Voltage Absence Tester<\/strong>: probes in contact \u2192 OK signal<\/li>\n\n\n\n<li><strong>Measurement<\/strong>: 3 checks (phase\/neutral + phase\/earth + neutral\/earth)<\/li>\n\n\n\n<li><strong>Final test of the Voltage Absence Tester<\/strong>: probes in contact \u2192 OK signal<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f <strong>If you are working in a NON-IP2X environment, you must wear your PPE throughout THE ENTIRE procedure<\/strong> (insulating gloves + face shield)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Bernard, a building caretaker, needs to replace a faulty socket.<\/strong>&nbsp;He switches off the corresponding circuit breaker. The lighting stops working. Before intervening, he takes out his Voltage Absence Tester (VAT).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phase\/neutral measurement: no signal. Phase\/earth measurement: audible signal and LED. The VAT detects 230V on the phase.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Returning to the panel, Bernard discovers he switched off the wrong circuit breaker due to incorrect labelling. The VAT identified the error before any contact with the conductors.<\/p>\n\n\n\n<p style=\"background-color: #e8f5e9; padding: 12px; border-left: 4px solid #4caf50; margin: 15px 0;\"><strong>In this article<\/strong>, you will follow the complete VAT procedure compliant with the NF C18-510 standard, from the initial test to the 3 mandatory measurements, following Bernard&#8217;s intervention.<\/p>\n\n\n\n<p style=\"background-color: #e3f2fd; padding: 12px; border-left: 3px solid #2196f3; margin-top: 15px;\"><strong>\ud83d\udca1 To go further:<\/strong> Our <a href=\"https:\/\/www.voltwork.fr\/en\/electrical-authorization-training-center\/bs-be-manoeuvre-training-paris-ile-de-france\/\" target=\"_blank\">BS BE Switching training<\/a> prepares you in 2 days with practical hands-on scenarios.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accidents related to electrical risks constitute a real danger in France (<a href=\"https:\/\/www.inrs.fr\/risques\/electriques\/accidents-origine-electrique.html\" target=\"_blank\" rel=\"noreferrer noopener\">INRS source<\/a>). A tripped circuit breaker \u2260 absence of voltage.<\/p>\n\n\n\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#What_is_a_VAT_and_why_is_it_mandatory\" >What is a VAT and why is it mandatory?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Definition_Voltage_Absence_Test\" >Definition: Voltage Absence Test<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#VAT_in_the_lockout_procedure_step_45\" >VAT in the lockout procedure (step 4\/5)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#VAT_what_does_the_NF_C18-510_standard_require\" >VAT: what does the NF C18-510 standard require?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#What_equipment_to_use_for_a_VAT\" >What equipment to use for a VAT?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#The_risks_of_using_a_multimeter\" >The risks of using a multimeter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#VAT_vs_multimeter_vs_VPD_comparison_table\" >VAT vs multimeter vs VPD: comparison table<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Errors_to_avoid_during_a_VAT\" >Errors to avoid during a VAT<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#What_PPE_is_required_to_perform_a_VAT\" >What PPE is required to perform a VAT?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Understanding_the_Low_Voltage_reinforced_vicinity_zone_Zone_4\" >Understanding the Low Voltage reinforced vicinity zone (Zone 4)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Insulating_gloves_inspection_and_required_class\" >Insulating gloves: inspection and required class<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Face_shield\" >Face shield<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#The_3-step_VAT_procedure\" >The 3-step VAT procedure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Step_1_%E2%80%93_Test_the_VAT_before_use_continuity_self-test\" >Step 1 &#8211; Test the VAT before use (continuity self-test)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Step_2_%E2%80%93_Verify_absence_of_voltage_on_all_conductors\" >Step 2 &#8211; Verify absence of voltage on all conductors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Step_3_%E2%80%93_Re-test_the_VAT_after_use_final_safety_check\" >Step 3 &#8211; Re-test the VAT after use (final safety check)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Practical_case_performing_a_de-energization_procedure_per_NF_C18-510\" >Practical case: performing a de-energization procedure per NF C18-510<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Validating_BS_intervention_conditions\" >Validating BS intervention conditions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Separation_locking_and_identification\" >Separation, locking and identification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Performing_the_VAT_the_3_mandatory_measurements\" >Performing the VAT: the 3 mandatory measurements<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#Interpreting_results_and_next_steps\" >Interpreting results and next steps<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/#5_questions_about_the_Voltage_Absence_Test\" >5 questions about the Voltage Absence Test<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_VAT_and_why_is_it_mandatory\"><\/span>What is a VAT and why is it mandatory?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Definition_Voltage_Absence_Test\"><\/span>Definition: Voltage Absence Test<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"gb-element-2645e56a\">\n<img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"512\" class=\"gb-media-25a09a7c\" alt=\"Voltage Absence Test definition\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/definition_la_vat.png\" title=\"definition_la_vat\" srcset=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/definition_la_vat.png 512w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/definition_la_vat-300x300.png 300w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/definition_la_vat-150x150.png 150w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The VAT is a procedure that confirms no dangerous voltage remains on an installation. Unlike a multimeter which measures a potential difference between two points, the Voltage Absence Tester detects the presence of voltage on each conductor independently.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VAT answers a binary question: voltage present (beep + LED) or voltage absent (no signal). This dual indication maximizes alert chances even in difficult conditions (noise, low light, confined space).<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"VAT_in_the_lockout_procedure_step_45\"><\/span>VAT in the lockout procedure (step 4\/5)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The Voltage Absence Test is never performed in isolation. It is part of an <strong><a href=\"https:\/\/www.voltwork.fr\/en\/electrical-authorization-guides\/electrical-lockout-steps\/\">electrical lockout<\/a><\/strong> or de-energization procedure, which comprises 5 successive steps:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Step<\/th><th>Action<\/th><th>Why<\/th><\/tr><\/thead><tbody><tr><td><strong>1. Separation<\/strong><\/td><td>Switch off the circuit breaker or disconnector<\/td><td>Physical disconnection from the electrical network<\/td><\/tr><tr><td><strong>2. Locking<\/strong><\/td><td>Apply padlock + circuit breaker lockout device<\/td><td>Prevents accidental re-energization<\/td><\/tr><tr><td><strong>3. Identification<\/strong><\/td><td>Identify the circuit as close as possible to the work zone<\/td><td>Avoid any confusion about the equipment involved<\/td><\/tr><tr><td><strong>4. VAT<\/strong><\/td><td>Verify absence of voltage with a compliant VAT<\/td><td>Confirm no dangerous voltage remains<\/td><\/tr><tr><td><strong>5. MALT<\/strong><br>(Optional in LV)<\/td><td>Grounding and short-circuiting<\/td><td>Mandatory only in High Voltage or specific risks<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p style=\"margin-top: 10px;padding: 12px;background-color: #fff3cd;border-left: 4px solid #ffc107;font-size: 0.95em;\"><strong>\ud83d\udca1 In Bernard&#8217;s case:<\/strong> for a simple intervention such as replacing a domestic socket, you follow steps 1 to 4. Step 5 (MALT) is not required in Low Voltage (230V), except in certain specific cases.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The VAT confirms that the first three actions (separation, locking, identification) have been correctly carried out and that no dangerous voltage remains. Without this verification, you cannot guarantee your electrical safety.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"VAT_what_does_the_NF_C18-510_standard_require\"><\/span>VAT: what does the NF C18-510 standard require?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The NF C18-510 standard is the French regulatory reference for safety during operations on electrical facilities and installations. It precisely defines what a VAT is and how it must be performed.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Requirement<\/th><th>What this means<\/th><\/tr><\/thead><tbody><tr><td><strong>\u274c Multimeter prohibited<\/strong><\/td><td><em>&#8220;Under no circumstances may a MEASURING device be used to perform a VAT&#8221;<\/em> (NF C18-510, page 74).<br>A multimeter measures a potential difference, not the presence of voltage on each conductor.<\/td><\/tr><tr><td><strong>\u2705 Compliant VAT mandatory<\/strong><\/td><td>The tester must comply with the&nbsp;<strong>NF EN 61243-3 standard<\/strong>.<br>It must provide &#8220;indisputable proof of the absence of nominal voltage&#8221;.<\/td><\/tr><tr><td><strong>\ud83d\udd04 Test before AND after<\/strong><\/td><td>The VAT must be checked <strong>immediately before<\/strong> and&nbsp;<strong>immediately after<\/strong> each verification.<br>This ensures it is functioning correctly and has not been damaged during the operation.<\/td><\/tr><tr><td><strong>\ud83e\udde4 <a href=\"https:\/\/www.voltwork.fr\/en\/electrical-authorization-guides\/ppe-electrical-authorization\/\">Mandatory PPE<\/a> in NON-IP2X environments<\/strong><\/td><td><strong>Insulating gloves + face shield minimum<\/strong> throughout the entire VAT when working in a non-IP2X environment.<\/td><\/tr><tr><td><strong>\ud83d\udccc IP2X probes only<\/strong><\/td><td>Mandatory since the standard was published. These probes have an insulating sleeve that limits the exposed metal part to&nbsp;<strong>4mm<\/strong> (instead of 2cm).<br>This prevents accidentally touching two terminals simultaneously in an electrical panel where conductors are closely spaced.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_equipment_to_use_for_a_VAT\"><\/span>What equipment to use for a VAT?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"512\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/image-1.png\" alt=\"Voltage Absence Tester\" class=\"wp-image-5010\" style=\"width:129px;height:auto\" srcset=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/image-1.png 512w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/image-1-300x300.png 300w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/image-1-150x150.png 150w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_risks_of_using_a_multimeter\"><\/span>The risks of using a multimeter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Scenario<\/strong>: Bernard wants to replace a faulty socket. He switches off what he thinks is the correct circuit breaker. To check, he takes out his multimeter and measures between the phase and neutral of the socket: <strong>0 volts displayed<\/strong>. He thinks he is safe and touches the wires with bare hands.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Result: electrification at 230V.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What happened?<\/strong> Bernard cut the neutral instead of the phase (identification error or mislabelled circuit breaker). The multimeter measures a <strong>potential difference<\/strong> between two points. Phase cut + neutral cut = open circuit = 0V difference. The device displays zero.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>But the phase remains energized at 230V relative to earth.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The multimeter does not lie: it does exactly what it is designed for (measuring a difference). But it cannot tell you whether an individual conductor is dangerous.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>With a Voltage Absence Tester, this trap does not exist.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Voltage Absence Tester detects the <strong>potential of each conductor independently<\/strong>, not a difference between two points. If Bernard had used a VAT:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Phase\/neutral measurement<\/strong>: No signal (both are cut)<\/li>\n\n\n\n<li><strong>Phase\/earth measurement<\/strong>: <strong>BEEP + LED<\/strong> \u2192 The phase is still energized at 230V!<\/li>\n\n\n\n<li><strong>Bernard stops immediately<\/strong> and returns to the panel to switch off the correct circuit breaker<\/li>\n<\/ol>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"VAT_vs_multimeter_vs_VPD_comparison_table\"><\/span>VAT vs multimeter vs VPD: comparison table<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">There are three types of devices that workers use (sometimes incorrectly) to check for the presence or absence of voltage. Here are their fundamental differences:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Criterion<\/th><th>VAT (Voltage Absence Tester)<\/th><th>Multimeter<\/th><th>VPD (Voltage Presence Detector)<\/th><\/tr><\/thead><tbody><tr><td><strong>Primary function<\/strong><\/td><td>Certify total absence of voltage<\/td><td>Measure a potential difference<\/td><td>Signal voltage presence<\/td><\/tr><tr><td><strong>Device type<\/strong><\/td><td>Safety device<\/td><td>Measuring device<\/td><td>Detection device<\/td><\/tr><tr><td><strong>NF C18-510 compliance<\/strong><\/td><td>\u2705 Mandatory for VAT<\/td><td>\u274c Prohibited for VAT<\/td><td>\u274c Insufficient for VAT<\/td><\/tr><tr><td><strong>Potential detection<\/strong><\/td><td>Yes, with a single probe<\/td><td>No, requires two points<\/td><td>Yes, contactless detection possible<\/td><\/tr><tr><td><strong>Self-test function<\/strong><\/td><td>\u2705 Mandatory before\/after use<\/td><td>\u274c No built-in self-test<\/td><td>Varies by model<\/td><\/tr><tr><td><strong>Battery-free operation<\/strong><\/td><td>\u2705 Yes, powered by the circuit under test<\/td><td>\u274c No, requires batteries<\/td><td>\u274c No, requires batteries<\/td><\/tr><tr><td><strong>Calibration error risk<\/strong><\/td><td>\u2705 None (no adjustment needed)<\/td><td>\u274c Yes (AC\/DC selection, range)<\/td><td>\u2705 None<\/td><\/tr><tr><td><strong>Warning signal<\/strong><\/td><td>Dual: audible + visual<\/td><td>Digital display only<\/td><td>Varies (audible, visual)<\/td><\/tr><tr><td><strong>Average price<\/strong><\/td><td>\u20ac100 to \u20ac300<\/td><td>\u20ac30 to \u20ac200<\/td><td>\u20ac20 to \u20ac80<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Errors_to_avoid_during_a_VAT\"><\/span>Errors to avoid during a VAT<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"max-width: 900px; margin: 30px auto; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;\">\n\n\t<!-- Error 1 -->\n\t<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n\t\t<details style=\"cursor: pointer;\">\n\t\t\t<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\">\u274c Error 1: Forgetting the self-test after measurement<\/summary>\n\t\t\t<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n\n\t\t\t\t<p><strong>The danger:<\/strong> Your VAT can fail during the test without you knowing. Overvoltage, accidental short circuit, mechanical shock: several causes can damage the device at the exact moment you are using it.<\/p>\n\n\t\t\t\t<p><strong>Consequence:<\/strong> A non-functional VAT that will never emit a signal again, even in the presence of voltage. You will continue to use it thinking it works.<\/p>\n\n\t\t\t\t<p style=\"background-color: #e8f5e9; padding: 10px; border-left: 3px solid #4caf50; margin-top: 10px;\"><strong>\u2705 Solution:<\/strong> Systematic self-test after each series of measurements.<\/p>\n\t\t\t<\/div>\n\t\t<\/details>\n\t<\/div>\n\n\t<!-- Error 2 -->\n\t<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n\t\t<details style=\"cursor: pointer;\">\n\t\t\t<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\">\u274c Error 2: Trusting the multimeter<\/summary>\n\t\t\t<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n\n\t\t\t\t<p><strong>The danger:<\/strong> A multimeter displaying 0V does not guarantee the absence of voltage.<\/p>\n\n\t\t\t\t<p><strong>Why it is dangerous:<\/strong><\/p>\n\n\t\t\t\t<ul style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n\t\t\t\t\t<li>It may measure two conductors at the same potential (230V each relative to earth = 0V difference)<\/li>\n\t\t\t\t\t<li>It may be faulty without you detecting it (low batteries, incorrect range, damaged device)<\/li>\n\t\t\t\t\t<li>It measures a difference between two points, not the potential of each conductor<\/li>\n\t\t\t\t<\/ul>\n\n\t\t\t\t<p style=\"background-color: #e8f5e9; padding: 10px; border-left: 3px solid #4caf50; margin-top: 10px;\"><strong>\u2705 Solution:<\/strong> Use exclusively a Voltage Absence Tester compliant with NF EN 61243-3 to certify absence of voltage.<\/p>\n\t\t\t<\/div>\n\t\t<\/details>\n\t<\/div>\n\n\t<!-- Error 3 -->\n\t<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n\t\t<details style=\"cursor: pointer;\">\n\t\t\t<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\">\u274c Error 3: Not wearing PPE during the VAT<\/summary>\n\t\t\t<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n\n\t\t\t\t<p><strong>The danger:<\/strong> &#8220;I switched off the circuit breaker, I&#8217;m safe.&#8221; This is exactly the reasoning that causes accidents.<\/p>\n\n\t\t\t\t<p><strong>Why PPE is mandatory DURING the VAT:<\/strong><\/p>\n\n\t\t\t\t<ul style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n\t\t\t\t\t<li>It is during the VAT that you confirm whether there is danger or not<\/li>\n\t\t\t\t\t<li>You cannot assume the installation is safe until the test is complete<\/li>\n\t\t\t\t\t<li>If your VAT detects voltage, you are already in contact with the installation<\/li>\n\t\t\t\t<\/ul>\n\n\t\t\t\t<p style=\"background-color: #e8f5e9; padding: 10px; border-left: 3px solid #4caf50; margin-top: 10px;\"><strong>\u2705 Solution:<\/strong> Insulating gloves + face shield BEFORE touching anything. Always.<\/p>\n\t\t\t<\/div>\n\t\t<\/details>\n\t<\/div>\n<\/div>\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_PPE_is_required_to_perform_a_VAT\"><\/span>What PPE is required to perform a VAT?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Understanding_the_Low_Voltage_reinforced_vicinity_zone_Zone_4\"><\/span>Understanding the Low Voltage reinforced vicinity zone (Zone 4)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>reinforced vicinity zone<\/strong> is a safety perimeter of <strong>30 cm around any live bare part<\/strong> in Low Voltage. If you enter this zone, you are exposed to electrification and PPE becomes mandatory.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Switchboard type<\/th><th>Is there a Zone 4?<\/th><th>PPE upon opening?<\/th><\/tr><\/thead><tbody><tr><td><strong>IP2X Switchboard<\/strong><br>Conductors protected by covers<\/td><td>\u274c No<br>Live parts are not accessible<\/td><td>\u274c No<br>PPE optional<\/td><\/tr><tr><td><strong>NON-IP2X Switchboard<\/strong><br>Visible bare conductors<\/td><td>\u2705 Yes<br>As soon as you are within 30 cm<\/td><td>\u2705 Yes<br>Gloves + face shield mandatory<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\ud83d\udca1 Simple test:<\/strong> Can you touch a bare conductor by reaching out from where you are standing? If yes \u2192 you are in Zone 4 \u2192 PPE mandatory.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Insulating_gloves_inspection_and_required_class\"><\/span>Insulating gloves: inspection and required class<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Insulating gloves are the first barrier of protection against electrical risk during a Voltage Absence Test. Even if you think you have correctly de-energized the installation, you must wear your insulating gloves throughout the entire VAT. Why? Because this is precisely the moment when you will confirm whether or not there is voltage. Until the test is complete, you are potentially in the danger zone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a Low Voltage intervention (up to 1,000V AC), you must use <strong>class 0<\/strong> insulating gloves (working voltage up to 500V AC) or <strong>class 00<\/strong> (working voltage up to 1,000V AC).<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Face_shield\"><\/span>Face shield<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The face shield<\/strong> (or protective visor) protects your face and eyes against the risk of electric arc. During a Voltage Absence Test, even though the risk is limited, an accidental short circuit or mishandling can cause an arc. This full protection is mandatory for any intervention in the reinforced vicinity zone or during a VAT on a non-IP2X switchboard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For Bernard, who is working on a Low Voltage socket, <strong>insulating gloves and the face shield are essential<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here is a summary table to help you identify when to wear your PPE:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Situation<\/th><th>IP2X Switchboard<\/th><th>NON-IP2X Switchboard<\/th><\/tr><\/thead><tbody><tr><td><strong>Opening the switchboard<\/strong><\/td><td>Without PPE<\/td><td>With gloves + face shield<\/td><\/tr><tr><td><strong>Identifying the circuit breaker<\/strong><\/td><td>Without PPE<\/td><td>With gloves + face shield<\/td><\/tr><tr><td><strong>Separation (disconnection)<\/strong><\/td><td>Without PPE<\/td><td>With gloves + face shield<\/td><\/tr><tr><td><strong>Locking<\/strong><\/td><td>Without PPE<\/td><td>With gloves + face shield<\/td><\/tr><tr><td><strong>VAT (verification)<\/strong><\/td><td><strong>With gloves + face shield<\/strong><\/td><td><strong>With gloves + face shield<\/strong><\/td><\/tr><tr><td><strong>Re-energization<\/strong><\/td><td>Without PPE (optional)<\/td><td>With gloves + face shield<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">In Bernard&#8217;s case, he must therefore check whether his building&#8217;s electrical panel is IP2X. If not, he must put on his insulating gloves and face shield as soon as the panel is opened, even before identifying the circuit breaker corresponding to the socket he wants to replace.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_3-step_VAT_procedure\"><\/span>The 3-step VAT procedure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"gb-element-881a9e66\">\n<img loading=\"lazy\" decoding=\"async\" width=\"1270\" height=\"409\" class=\"gb-media-9d1fffce\" alt=\"VAT procedure steps diagram\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/schema_etapes_vat.jpg\" title=\"schema_etapes_vat\" srcset=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/schema_etapes_vat.jpg 1270w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/schema_etapes_vat-300x97.jpg 300w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/schema_etapes_vat-1024x330.jpg 1024w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/schema_etapes_vat-768x247.jpg 768w\" sizes=\"auto, (max-width: 1270px) 100vw, 1270px\" \/>\n<\/div>\n\n\n\n<div style=\"height:60px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_1_%E2%80%93_Test_the_VAT_before_use_continuity_self-test\"><\/span>Step 1 &#8211; Test the VAT before use (continuity self-test)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before checking for the absence of voltage on your installation, the first thing to do is verify that your VAT is in working order. This is the step known as the <strong>self-test<\/strong> or <strong>continuity test<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Here is how to perform the self-test:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Take your Voltage Absence Tester<\/li>\n\n\n\n<li>Bring the <strong>two test probes<\/strong> into contact with each other<\/li>\n\n\n\n<li>The VAT must emit an <strong>audible signal<\/strong> (continuous or intermittent beep depending on the model)<\/li>\n\n\n\n<li>Simultaneously, a <strong>visual signal<\/strong> (LED) must light up<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Some professional VAT models incorporate a <strong>self-test button<\/strong>. In this case, simply press the button to verify the device is functioning. The result is the same: audible signal + visual signal = device operational.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>If no signal appears<\/strong> (neither sound nor light), your VAT is out of service. Do not use it. First check that the test leads are correctly plugged into the device. If the problem persists, replace the batteries (if your model uses them) or replace the device. An important detail: a good VAT continues to work even if its batteries are dead, by drawing energy from the circuit under test.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_2_%E2%80%93_Verify_absence_of_voltage_on_all_conductors\"><\/span>Step 2 &#8211; Verify absence of voltage on all conductors<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Your VAT is functioning correctly? Perfect. You can now verify the absence of voltage on the installation. This step takes place <strong>as close as possible to the work zone<\/strong>, not only at the electrical panel.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Let us return to Bernard&#8217;s example. He needs to replace a socket. He has switched off the corresponding circuit breaker and locked it with his padlock. He now stands in front of the faulty socket with his Voltage Absence Tester and his PPE.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>You must verify the absence of voltage between all active conductors.<\/strong> In a standard domestic or commercial installation, this means three mandatory measurements:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Between phase and neutral<\/strong> \u2013 Place one test probe on the phase conductor (usually red, black or brown) and the other on the neutral conductor (usually blue).<\/li>\n\n\n\n<li><strong>Between phase and earth<\/strong> \u2013 Place one probe on the phase conductor and the other on the earth conductor (usually green\/yellow).<\/li>\n\n\n\n<li><strong>Between neutral and earth<\/strong> \u2013 Place one probe on the neutral conductor and the other on the earth conductor.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Interpreting results:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>No audible or visual signal<\/strong> = Absence of voltage confirmed. You can proceed with your intervention safely.<\/li>\n\n\n\n<li><strong>Audible signal + visual signal<\/strong> = Voltage detected. <strong>Do not intervene.<\/strong> Return to the electrical panel for further investigation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why check phase\/earth?<\/strong> If the neutral is cut but the phase is still energized, the phase\/neutral measurement could indicate absence of voltage (because the circuit is open). But the phase remains dangerous at 230V relative to earth. The phase\/earth measurement will detect this problem.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why check neutral\/earth?<\/strong> In certain faulty installations, the neutral can be under voltage (phase\/neutral inversion, voltage feedback from a connected appliance). The neutral\/earth measurement detects this anomaly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you are working on a three-phase installation, you will need to perform more measurements: between each phase, between each phase and neutral, between each phase and earth, then between neutral and earth. The principle remains the same: <strong>verify all active conductors<\/strong>.<\/p>\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Step_3_%E2%80%93_Re-test_the_VAT_after_use_final_safety_check\"><\/span>Step 3 &#8211; Re-test the VAT after use (final safety check)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">You have verified the absence of voltage and no signal appeared. Can you intervene? <strong>Not yet.<\/strong> One crucial final step remains: re-testing your Voltage Absence Tester.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Why this additional check? Because it is possible that your VAT failed during the measurement. If the device burned out at the moment you touched the conductors (due to an overvoltage, fault, or shock), it would have emitted no signal even if voltage was present. You would then have believed in the absence of voltage while the danger persisted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The final verification procedure is identical to the initial self-test.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This double verification (before and after) is a requirement of the NF C18-510 standard. It guarantees that your Voltage Absence Tester was functional at the precise moment you performed the measurement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Complete summary of the 3-step VAT procedure:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Step<\/th><th>Action<\/th><th>Expected result<\/th><th>If problem<\/th><\/tr><\/thead><tbody><tr><td><strong>Step 1<\/strong><\/td><td>Self-test: probes in contact<\/td><td>Audible + visual signal<\/td><td>VAT out of service: do not use<\/td><\/tr><tr><td><strong>Step 2<\/strong><\/td><td>Measurements phase\/neutral, phase\/earth, neutral\/earth<\/td><td>No signal<\/td><td>Signal emitted = voltage present: do not intervene<\/td><\/tr><tr><td><strong>Step 3<\/strong><\/td><td>New self-test: probes in contact<\/td><td>Audible + visual signal<\/td><td>No signal = restart with another VAT<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Practical_case_performing_a_de-energization_procedure_per_NF_C18-510\"><\/span>Practical case: performing a de-energization procedure per NF C18-510<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"400\" class=\"gb-media-830a7bfb\" alt=\"VAT test on circuit breaker\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/test_de_vat_sur_disjoncteur.jpg\" title=\"test_de_vat_sur_disjoncteur\" srcset=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/test_de_vat_sur_disjoncteur.jpg 800w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/test_de_vat_sur_disjoncteur-300x150.jpg 300w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/test_de_vat_sur_disjoncteur-768x384.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Validating_BS_intervention_conditions\"><\/span>Validating BS intervention conditions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before intervening, Bernard verifies that he holds BS authorization for this type of intervention (socket replacement in LV \u2264400V). His employer has confirmed he can carry out this operation. In case of doubt, he requests confirmation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Separation_locking_and_identification\"><\/span>Separation, locking and identification<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Before performing the VAT, Bernard must carry out the first three steps of electrical lockout: intervention analysis, separation, locking and identification.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Preliminary step: Intervention analysis<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bernard begins by analyzing the situation:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Reinforced vicinity risk<\/strong> \u2013 He checks whether there is a reinforced vicinity risk near the socket. If neighbouring equipment remains energized within 30 cm, he will also need to de-energize it.<\/li>\n\n\n\n<li><strong>Identifying the electrical panel<\/strong> \u2013 Bernard identifies the electrical panel to which the socket is connected. He checks whether this panel is IP2X (protection against the introduction of objects larger than 12.5 mm).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 1: Separation (de-energization)<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once the correct circuit breaker is identified, Bernard performs the <strong>separation<\/strong> by switching off the circuit breaker. The electrical circuit is now disconnected from the network.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 2: Locking<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Switching off the circuit breaker is not enough. Someone could turn it back on during Bernard&#8217;s intervention, by mistake or ignorance. To prevent this, Bernard places a <strong>circuit breaker lockout device<\/strong> and a <strong>lockout padlock<\/strong> on the disconnection device.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Step 3: Identification<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bernard returns to the faulty socket (and any other equipment he has de-energized to eliminate the reinforced vicinity risk). He can now proceed with the Voltage Absence Test.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Performing_the_VAT_the_3_mandatory_measurements\"><\/span>Performing the VAT: the 3 mandatory measurements<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"400\" class=\"gb-media-22652e99\" alt=\"Performing VAT measurements\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/realisation_de_la_vat-min.jpg\" title=\"realisation_de_la_vat-min\" srcset=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/realisation_de_la_vat-min.jpg 800w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/realisation_de_la_vat-min-300x150.jpg 300w, https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/realisation_de_la_vat-min-768x384.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Bernard is now ready to perform his Voltage Absence Test. The VAT is always performed wearing personal protective equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Preparing the Voltage Absence Tester<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, Bernard tests his VAT. He brings the two test probes into contact: the device emits an audible beep and a visual signal lights up. The VAT is functioning correctly. Bernard can proceed with the measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The 3 mandatory measurements on the socket<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a standard single-phase AC socket, this means three measurements:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Measurement 1: Between phase and neutral<\/li>\n\n\n\n<li>Measurement 2: Between phase and earth<\/li>\n\n\n\n<li>Measurement 3: Between neutral and earth<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">These three measurements are essential. Never settle for checking only phase\/neutral.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Final VAT verification<\/strong><\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"gb-element-d508e1e5\">\n<img loading=\"lazy\" decoding=\"async\" width=\"480\" height=\"270\" class=\"gb-media-89d762a9\" src=\"https:\/\/www.voltwork.fr\/wp-content\/uploads\/2025\/10\/test_vat-1_min.gif\" alt=\"VAT self-test animation\" title=\"test_vat-1_min\"\/>\n<\/div>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Bernard has completed his three measurements. No signal appeared. Can he intervene? Not yet. He must ensure his Voltage Absence Tester is still functioning. Bernard brings the two test probes into contact again: audible beep + visual signal. Perfect, the VAT was not damaged during the measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>The absence of voltage is now confirmed.<\/strong><\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Interpreting_results_and_next_steps\"><\/span>Interpreting results and next steps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u2705 Scenario 1: No signal during all 3 measurements<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The absence of audible and visual signal confirms that no dangerous voltage remains. Bernard can intervene safely.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">He replaces the faulty socket, returns to the electrical panel, removes the padlock and lockout device, then resets the circuit breaker. <strong>If the panel is not IP2X, he puts his insulating gloves and face shield back on for this operation.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">He tests that the new socket functions correctly and informs the electrical operations manager that the intervention is complete.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u26a0\ufe0f Scenario 2: Signal emitted during one of the measurements<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>STOP IMMEDIATELY. DO NOT INTERVENE.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Audible signal + visual signal = voltage present = danger. Do not touch any conductor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible causes:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wrong circuit breaker switched off<\/strong>&nbsp;\u2013 Return to the panel and verify the identification<\/li>\n\n\n\n<li><strong>Faulty circuit breaker<\/strong>&nbsp;\u2013 Call a qualified electrician<\/li>\n\n\n\n<li><strong>Voltage feedback<\/strong>&nbsp;\u2013 Inverter, backup generator or photovoltaic panels feeding power back<\/li>\n\n\n\n<li><strong>Installation with multiple power sources<\/strong>&nbsp;\u2013 Identify and disconnect all sources<\/li>\n<\/ul>\n\n\n\n<p style=\"background-color: #ffebee; padding: 12px; border-left: 3px solid #d32f2f; margin-top: 15px;\"><strong>Under no circumstances should you intervene while the VAT detects voltage.<\/strong> Ignoring a VAT signal = fatal risk.<\/p>\n\n\n\n<div style=\"height:40px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_questions_about_the_Voltage_Absence_Test\"><\/span>5 questions about the Voltage Absence Test<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<div style=\"max-width: 900px; margin: 30px auto; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;\">\n<p><!-- Question 1 --><\/p>\n<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n<details style=\"cursor: pointer;\">\n<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\"> \ud83d\udd27 How often should I check\/inspect my VAT? <\/summary>\n<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n<ul style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n<li>Self-test before\/after EACH use (mandatory)<\/li>\n<li>Periodic inspection every 6 to 12 months by an accredited body<\/li>\n<li>Daily visual inspection: damaged probes, cracked casing, damaged cables<\/li>\n<\/ul>\n<\/div>\n<\/details>\n<\/div>\n<p><!-- Question 2 --><\/p>\n<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n<details style=\"cursor: pointer;\">\n<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\"> \ud83d\udcb0 How much does a Voltage Absence Tester cost? <\/summary>\n<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n<p><strong>Between \u20ac80 and \u20ac350<\/strong> depending on the model and voltage range.<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 15px 0;\">\n<thead>\n<tr style=\"background-color: #f8f9fa;\">\n<th style=\"padding: 10px; text-align: left; border: 1px solid #e0e0e0;\">Type<\/th>\n<th style=\"padding: 10px; text-align: left; border: 1px solid #e0e0e0;\">Indicative price<\/th>\n<th style=\"padding: 10px; text-align: left; border: 1px solid #e0e0e0;\">Use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">LV VAT (50-1000V)<\/td>\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">\u20ac80-150<\/td>\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">Caretaker, LV maintenance<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">Multi-range VAT<\/td>\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">\u20ac200-350<\/td>\n<td style=\"padding: 10px; border: 1px solid #e0e0e0;\">Professional electrician<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Recommended brands:<\/strong> Fluke, Chauvin Arnoux, Catu, Sibille Fameca<\/p>\n<p style=\"background-color: #fff3cd; padding: 10px; border-left: 3px solid #ffc107; margin-top: 10px;\"><strong>\u26a0\ufe0f Warning:<\/strong> Verify that the VAT complies with the NF EN 61243-3 standard and covers your voltage domain (230V for Bernard).<\/p>\n<\/div>\n<\/details>\n<\/div>\n<p><!-- Question 3 --><\/p>\n<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n<details style=\"cursor: pointer;\">\n<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\"> \u23f1\ufe0f How long is a VAT valid? <\/summary>\n<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n<p><strong style=\"color: #d32f2f;\">A VAT is valid only for the current intervention.<\/strong><\/p>\n<p><strong>You must redo a complete VAT if:<\/strong><\/p>\n<ul style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n<li>You leave the work zone<\/li>\n<li>Someone else accesses the electrical panel<\/li>\n<li>You work on a different circuit<\/li>\n<li>Your intervention spans multiple days (redo the VAT each day)<\/li>\n<li>You have any doubt about accidental re-energization<\/li>\n<\/ul>\n<p style=\"background-color: #e8f5e9; padding: 10px; border-left: 3px solid #4caf50; margin-top: 10px;\"><strong>\u2705 Principle:<\/strong> One VAT = one intervention = one work zone = one continuous period.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<p><!-- Question 4 --><\/p>\n<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n<details style=\"cursor: pointer;\">\n<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\"> \ud83c\udf93 Do I need training to perform a VAT? <\/summary>\n<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n<p><strong style=\"color: #d32f2f;\">Yes, you must hold at minimum BS or BE Switching electrical authorization.<\/strong><\/p>\n<p><strong>For Bernard (building caretaker):<\/strong><\/p>\n<ul style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n<li><strong>BS authorization<\/strong>: replace sockets, switches, luminaires (simple interventions)<\/li>\n<li><strong>Duration<\/strong>: 2 days of training<\/li>\n<li><strong>Recertification<\/strong>: every 3 years<\/li>\n<li><strong>Issued<\/strong>: by the employer after training by a certified body<\/li>\n<\/ul>\n<p style=\"background-color: #e3f2fd; padding: 12px; border-left: 3px solid #2196f3; margin-top: 10px;\"><strong>\ud83d\udca1 Good to know:<\/strong> Without authorization, you are not legally permitted to open an electrical panel or touch active conductors, even when de-energized. This is a legal obligation (French Labour Code).<\/p>\n<p style=\"margin-top: 15px;\"><strong>\ud83d\udc49 <a style=\"color: #2196f3; text-decoration: none; font-weight: 600;\" href=\"https:\/\/www.voltwork.fr\/en\/electrical-authorization-training-center\/\">See our BS electrical authorization training<\/a><\/strong><\/p>\n<\/div>\n<\/details>\n<\/div>\n<p><!-- Question 5 --><\/p>\n<div style=\"margin-bottom: 15px; border: 1px solid #e0e0e0; border-radius: 8px; overflow: hidden;\">\n<details style=\"cursor: pointer;\">\n<summary style=\"padding: 15px 20px; background-color: #f8f9fa; font-weight: 600; color: #2c3e50; font-size: 1.05em;\"> \ud83d\udea8 What should I do if my VAT emits a signal during the measurement? <\/summary>\n<div style=\"padding: 15px 20px; background-color: white; line-height: 1.6;\">\n<p><strong style=\"color: #d32f2f; font-size: 1.1em;\">STOP IMMEDIATELY. DO NOT INTERVENE.<\/strong><\/p>\n<p><strong>Audible signal + visual signal = voltage present = danger.<\/strong><\/p>\n<p><strong>Procedure to follow:<\/strong><\/p>\n<ol style=\"margin: 10px 0 0 15px; line-height: 1.8;\">\n<li><strong>Do not touch any conductor<\/strong><\/li>\n<li>Return to the electrical panel<\/li>\n<li>Verify you have switched off the correct circuit breaker<\/li>\n<li>If correct, check the panel labelling (possible identification error)<\/li>\n<li>If the circuit breaker is correct and identified \u2192 <strong>call a qualified electrician<\/strong><\/li>\n<\/ol>\n<p style=\"background-color: #ffebee; padding: 12px; border-left: 3px solid #d32f2f; margin-top: 10px;\"><strong>\u26d4 Possible causes:<\/strong> Wrong circuit breaker switched off, faulty circuit breaker, voltage feedback (inverter, solar panels), installation with multiple power sources.<\/p>\n<p><strong>Ignoring a VAT signal = fatal risk.<\/strong><\/p>\n<\/div>\n<\/details>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Step-by-step guide to performing a Voltage Absence Test (VAT) per NF C18-510: self-test, 3 mandatory measurements, required PPE, common errors and practical 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errors.","sous-titre":null,"image_hero":null,"h1_villes":null,"h2_catalogue":null,"sous_titre_catalogue":null,"presentation_voltwork":null,"se_former_aux_he":null,"objectif_h0b0":null,"objectif_bs_be":null,"objectif_b1_b2":null,"objectif_h1_h2":null,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Perform a VAT: Complete Voltage Absence Test Procedure<\/title>\n<meta name=\"description\" content=\"How to perform a Voltage Absence Test (VAT) per NF C18-510: self-test, 3 measurements, PPE and common errors.\" \/>\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.voltwork.fr\/en\/training\/voltage-absence-test-procedure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Perform 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