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Habilitation Électrique B1V/BS study materials
Habilitation Électrique B1V/BS study resources

Habilitation Électrique B1V/BS practice questions

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Question 1French employer authorization and the actual assigned role

Under Article R.4544-10 of the French Labour Code (Code du travail), who has the statutory authority and legal obligation to issue an electrical habilitation to an employee?

  1. The employer (or their delegated representative). Correct answer.
  2. The certified training instructor who administered the evaluation.
  3. The occupational physician (médecin du travail).
  4. The regional labour inspector (inspecteur du travail).

Explanation

Article R.4544-10 states that the employer issues the habilitation, specifying the nature of the operations the worker may perform. A trainer may provide an avis après formation, but that opinion is not itself the employer's operational title.

Question 2French employer authorization and the actual assigned role

Since 1 October 2025, which health-attestation rule applies to the B1V and BS symbols in this combined study bank?

  1. B1V operations in reinforced vicinity require a valid occupational-physician attestation of no contraindications, normally valid for five years; BS alone is not covered by that specific requirement. Correct answer.
  2. Both B1V and BS require a new full medical fitness certificate before every shift.
  3. Only BS requires the five-year attestation; B1V is exempt.
  4. Neither symbol can ever involve an occupational-health requirement.

Explanation

The rules effective 1 October 2025 require an attestation of absence of medical contraindications for specified electrical operations, including B1V work in reinforced vicinity. It is issued by the occupational physician and is generally valid for five years. The specific list does not include BS elementary interventions, so a combined B1V/BS bank must not state that the same attestation is universally mandatory for both symbols.

Question 3French employer authorization and the actual assigned role

An employee completes role-adapted theoretical and practical training and receives a favorable training opinion (avis après formation). Can the employee immediately start performing electrical work at the company?

  1. No; the employee must wait until the employer officially delivers a signed Titre d'Habilitation specifying the authorized symbols and operational scope. Correct answer.
  2. Yes; the training certificate automatically serves as a provisional nationwide habilitation for 30 days.
  3. Yes; as long as the employee keeps a copy of the training certificate on their person.
  4. No; the employee must first register the certificate with the regional DREAL prefecture.

Explanation

A training opinion is distinct from the employer-issued title and actual designation for work. The employer assesses the task, competence, environment and any applicable current health requirements, and supplies the relevant instructions. Receiving a title still does not give the worker unrestricted independent authority to begin any operation.

Question 4B1 and B1V execution within a controlled work arrangement

What is the primary role and definition of a worker holding a B1 habilitation under standard NF C 18-510?

  1. An electrical executant (exécutant électricien BT) who carries out electrical work on de-energized installations under the orders and supervision of a Chargé de travaux (B2). Correct answer.
  2. A non-electrician worker authorized to perform structural masonry work inside substations.
  3. A safety officer authorized to sign consignation certificates and hand over installations.
  4. A chief electrical engineer authorized to perform live-line maintenance without PPE.

Explanation

A B1 worker is an 'exécutant électricien' in low voltage. They possess electrical trade qualifications and are authorized to execute installation, wiring, and assembly tasks on de-energized and consigned systems under the direction and supervision of a Chargé de travaux (B2) or Chargé d'intervention (BR).

Question 5B1 and B1V execution within a controlled work arrangement

What additional operational authorization does the 'V' attribute provide to a B1V executant compared to a basic B1 executant?

  1. The authorization to perform electrical work inside Zone 4 (Zone de voisinage renforcé BT: between 0 and 30 cm from bare live conductors). Correct answer.
  2. The authorization to carry out live-line working (travaux sous tension) with bare hands.
  3. The authorization to consign electrical panels independently without a BC.
  4. The authorization to drive company commercial vehicles equipped with electrical test equipment.

Explanation

The letter 'V' indicates 'Voisinage'. In low voltage, a B1V executant is authorized to carry out work within Zone 4 (voisinage renforcé BT: less than 30 cm from bare live parts), using required PPE and under the supervision of a Chargé de travaux (B2V). A B1 holder without 'V' cannot enter Zone 4 while adjacent parts remain energized.

Question 6B1 and B1V execution within a controlled work arrangement

Under whose direct operational authority does a B1 or B1V electrical executant work on a construction or overhaul worksite?

  1. Under the authority of a Chargé de travaux (B2 or B2V) or a Chargé d'intervention (BR). Correct answer.
  2. Under the direct authority of another B1 executant.
  3. Independently without reporting to any supervisor.
  4. Under the authority of a non-electrician holding B0.

Explanation

A B1 or B1V executant never works autonomously as a work leader. They must always operate under the instructions and direct oversight of a Chargé de travaux (B2 or B2V) for planned works (travaux), or a Chargé d'intervention (BR) during general interventions.

Question 7BS elementary intervention limits and escalation

What is the official definition and intended professional scope of the BS habilitation symbol under standard NF C 18-510?

  1. Chargé d'interventions élémentaires BT: a non-electrician authorized to autonomously perform simple, limited interventions on de-energized low-voltage terminal circuits. Correct answer.
  2. Chargé de travaux électriques: a master electrician authorized to build industrial power plants.
  3. Chargé de consignation générale: a high-voltage engineer authorized to switch regional power grids.
  4. Exécutant non-électricien: a cleaner authorized only to sweep floors in office corridors.

Explanation

BS identifies the listed elementary low-voltage terminal-circuit interventions subject to all relevant scope and safety conditions. A person need not hold a general electrician qualification solely to receive this role, but must have appropriate training, competence and employer authorization. It is not unrestricted autonomy to troubleshoot or create new circuits.

Question 8BS elementary intervention limits and escalation

What type of circuit is a BS holder strictly authorized to intervene on under standard NF C 18-510?

  1. Exclusively on terminal circuits (circuits terminaux) protected against overcurrents and short circuits. Correct answer.
  2. On main electrical switchboards (TGBT) and high-power distribution busbars.
  3. On medium-voltage 20 kV transformer inputs.
  4. On underground high-voltage distribution networks.

Explanation

NF C 18-510 Clause 10.2 strictly confines BS interventions to terminal circuits (circuits terminaux)-the final branch circuits supplying end-use equipment (lights, standard receptacles, water heaters, small single components). A BS is strictly prohibited from intervening on distribution panels, main switchboards (TGBT), or intermediate feeders.

Question 9BS elementary intervention limits and escalation

What are the statutory maximum electrical voltage and current ratings for a terminal circuit on which a BS holder is permitted to intervene?

  1. Maximum 400 V AC or 600 V DC, with upstream protection no greater than 32 A AC or 16 A DC. Correct answer.
  2. Maximum 24 V AC and maximum 2 A AC.
  3. Maximum 1,000 V AC and maximum 630 A AC.
  4. There are no limits as long as the worker uses insulated pliers.

Explanation

INRS states that a BS elementary intervention is limited to a terminal circuit at no more than 400 V AC or 600 V DC, protected at no more than 32 A AC or 16 A DC, with conductors no larger than 6 mm² copper or 10 mm² aluminium. The work is performed de-energized and outside reinforced vicinity.

Question 10Shock, arc, stored energy and protective limitations

In French electrical safety terminology under standard NF C 18-510, what is the fundamental difference between 'électrisation' and 'électrocution'?

  1. Électrisation is the physiological effect of electric current passing through a person, whereas électrocution is an electrical accident resulting in death. Correct answer.
  2. Électrisation refers to high-voltage shock only, whereas électrocution applies exclusively to low-voltage contact.
  3. Électrisation is fatal within 24 hours, whereas électrocution causes instantaneous death.
  4. Électrocution refers to non-fatal electrical burns, whereas électrisation refers only to cardiac arrest.

Explanation

Under standard NF C 18-510 and French occupational safety regulations, 'électrisation' is the general term for any physiological effect caused by electric current flowing through the human body (whether benign, painful, or causing injury), whereas 'électrocution' is strictly defined as an electrical accident that causes the death of the victim.

Question 11Shock, arc, stored energy and protective limitations

What constitutes a 'direct contact' (contact direct) hazard under standard NF C 18-510?

  1. A person touching an active conductor or conductive part that is normally live during ordinary operation. Correct answer.
  2. A person touching a metallic casing that has accidentally become energized due to an internal insulation breakdown.
  3. Current arcing through the air across a distance greater than 3 meters in a low-voltage installation.
  4. A worker contacting an earthed metal conduit during de-energized maintenance work.

Explanation

A direct contact (contact direct) occurs when a person touches an active part (conductor or terminal) that is normally energized under standard operating conditions (e.g., touching a bare phase conductor or busbar). Touching an exposed metal casing energized by an internal insulation fault is classified as an indirect contact (contact indirect).

Question 12Shock, arc, stored energy and protective limitations

According to Ohm's law ($I = U / R$), which factor significantly decreases total human body electrical resistance, thereby dramatically increasing the current flowing through the body at a given voltage?

  1. Skin humidity, sweat, or wet working conditions. Correct answer.
  2. Wearing thick dry leather over-gloves.
  3. Decreasing the surface area of skin contact with the conductor.
  4. Increasing the thickness of the dry epidermis.

Explanation

Human electrical impedance consists primarily of skin resistance in series with internal body resistance. Wet skin, perspiration (which contains electrolytes), or damp environmental conditions bypass the high insulating properties of dry stratum corneum, sharply reducing overall resistance $R$ and causing a much higher current $I$ to pass through the body.

Question 13Electrical incident response boundaries and safe escalation

What is the current SST-aligned priority sequence for first response to an electrical accident in the workplace?

  1. 1. Protéger; 2. Examiner; 3. Faire alerter ou alerter; 4. Secourir. Correct answer.
  2. 1. Secourir; 2. Alerter; 3. Examiner; 4. Protéger.
  3. 1. Alerter; 2. Photograph the accident for insurance; 3. Evacuate the city.
  4. 1. Call the manufacturer; 2. Order spare parts; 3. Perform a VAT.

Explanation

The named SST teaching sequence organizes protection, examination, alert and assistance according to the actual situation and competence. The scene must be safe before contact with a victim, and the emergency operator’s instructions matter. A memorized sequence does not authorize electrical rescue or replace supervised first-aid training.

Question 14Electrical incident response boundaries and safe escalation

If a victim may still be in contact with a live conductor and the rescuer cannot promptly isolate the electrical supply, what is the safest general response?

  1. Do not touch the victim; keep others away, call emergency services, and use purpose-designed electrical rescue equipment only if specifically trained and authorized to do so. Correct answer.
  2. By wrapping wet bath towels around their hands and pulling the victim's belt.
  3. By using a steel crowbar to pry the victim away from the conductor.
  4. By touching the victim with bare elbows instead of palms.

Explanation

Improvised brooms, ropes, or clothing cannot be assumed to have a known dielectric rating, especially if damp or contaminated. The rescuer must avoid direct contact, prevent others from entering, alert emergency services, and prioritize supply isolation. A purpose-designed rescue pole may be used only within the training, authorization, and procedure established for the electrical installation.

Question 15Electrical incident response boundaries and safe escalation

What are the primary emergency phone numbers to dial in France when reporting a workplace electrical accident with a victim?

  1. 15 (SAMU - emergency medical service), 18 (Sapeurs-Pompiers - rescue/fire), or 112 (European emergency number). Correct answer.
  2. 17 (Police) only.
  3. 3615 on a telephone Minitel terminal.
  4. The internal company customer service hotline.

Explanation

In France, medical and rescue emergencies are alerted via: 15 (SAMU - Service d'Aide Médicale Urgente, for medical direction and mobile intensive care SMUR); 18 (Sapeurs-Pompiers, for rescue, extrication, and resuscitation); or 112 (European emergency number from mobile phones). For hearing impaired, SMS 114 is available.

Question 16Supporting circuit and measurement models

An electric convector heater with a pure resistance of 23 Ω is connected to a 230 V single-phase AC circuit. What is the current flowing through the heater?

  1. 10 A Correct answer.
  2. 5 A
  3. 12 A
  4. 23 A

Explanation

According to Ohm's law, I = U / R. For a resistive load connected to 230 V with R = 23 Ω, the current is I = 230 V / 23 Ω = 10 A.

Question 17Supporting circuit and measurement models

Which physical law states that the thermal power dissipated in a conductor is directly proportional to its resistance and the square of the electric current (P = R × I²)?

  1. Joule's law (Effet Joule) Correct answer.
  2. Lenz's law
  3. Faraday's law
  4. Coulomb's law

Explanation

Joule's law (l'effet Joule) defines the thermal energy released by an electric current passing through a conductor with resistance R, expressed as P = R × I² in watts (or Q = R × I² × t in joules).

Question 18Supporting circuit and measurement models

A steady current of 16 A flows through a circuit conductor with a total resistance of 0.5 Ω. What is the thermal power dissipated along the cable by the Joule effect?

  1. 64 W
  2. 128 W Correct answer.
  3. 256 W
  4. 8 W

Explanation

Using Joule's law, P = R × I². Here, P = 0.5 Ω × (16 A)² = 0.5 × 256 = 128 W of dissipated thermal power.

Question 19French employer authorization and the actual assigned role

What is the periodic refresher training (recyclage) interval recommended by standard NF C 18-510 and the INRS ED 6127 guidelines for low-voltage habilitations (such as B1V and BS)?

  1. Every 3 years (or sooner if duties, installations, or regulations substantially change). Correct answer.
  2. Every 10 years, coinciding with statutory electrical decennial building inspections.
  3. Every 12 months, as an annual mandatory re-examination.
  4. Habilitation is granted indefinitely and never requires retraining unless an accident occurs.

Explanation

INRS recommends a three-year refresher interval in the general framework, with shorter reassessment or retraining where actual activity and change require it. The employer determines the title’s validity and checks its fit to the work. A recommendation is not a universal statutory three-year expiry for every possible authorization.

Question 20French employer authorization and the actual assigned role

In the standard NF C 18-510 coding system for electrical habilitation symbols, what does each component of the symbol 'B1V' represent?

  1. 'B' = Low Voltage (Basse Tension); '1' = Electrical executant (exécutant); 'V' = Authorized to operate in the reinforced vicinity zone (Zone 4 / Voisinage renforcé). Correct answer.
  2. 'B' = Building maintenance; '1' = Level 1 non-electrician; 'V' = Voltage verification authorized.
  3. 'B' = Single-phase circuit; '1' = Primary operator; 'V' = Variable frequency drive specialist.
  4. 'B' = Low Voltage; '1' = Work leader (chargé de travaux); 'V' = Lockout authorized.

Explanation

Under NF C 18-510: the first letter indicates voltage domain ('B' for BT / TBT; 'H' for HT); the second character indicates the role ('0' = non-electrician, '1' = electrician executant, '2' = chargé de travaux, 'C' = consignation, 'R' = intervention générale, 'S' = intervention élémentaire); the third letter indicates an attribute ('V' = travail au voisinage renforcé / Zone 4).

Question 21French employer authorization and the actual assigned role

An employer assigns an employee who holds a B1V habilitation to lead a team of three electricians carrying out major installation work on a de-energized distribution switchboard. Is this assignment compliant with NF C 18-510?

  1. No; a B1V holder is strictly an executant and cannot direct electrical work or lead a team; directing work requires a B2 (Chargé de travaux) habilitation. Correct answer.
  2. Yes; any level 1 electrician can act as a work leader if the team consists of fewer than five workers.
  3. Yes; the 'V' attribute automatically grants supervisory and work-direction authority in low voltage.
  4. No; a B1V can only direct non-electrician personnel holding B0, but not other electricians.

Explanation

A B1 or B1V habilitation is strictly an 'exécutant électricien' symbol. An executant works under the orders of a Chargé de travaux (B2) or Chargé d'intervention (BR). To direct electrical work, ensure team safety, receive an attestation de consignation, and manage a work zone, the worker must hold a B2 habilitation.

Question 22French employer authorization and the actual assigned role

A temporary employment agency (entreprise de travail temporaire) sends an electrician to a host manufacturing plant (entreprise utilisatrice). Who must deliver the electrical habilitation for work on the host installation?

  1. The host company (entreprise utilisatrice), after checking competence and any applicable health attestation and providing site-specific safety instructions. Correct answer.
  2. The temporary work agency (agence d'intérim), because it signs the worker's employment contract.
  3. The temporary worker self-certifies by presenting their vocational diploma.
  4. The regional occupational health service (SPST) directly issues the title.

Explanation

For a temporary worker operating on the host installation, the host enterprise issues the title after confirming that the worker's competence, instructions, environment, and any operation-specific health attestation match the assignment. The title remains an employer-side operational decision, not a portable certificate automatically conferred by the training course.

Question 23French employer authorization and the actual assigned role

What is the key regulatory distinction between 'Travaux' (electrical work) and 'Interventions' in low-voltage installations under NF C 18-510?

  1. Travaux are planned operations organized under a B2, whereas low-voltage interventions are short-duration, localized operations performed by a BS or BR; a BR may direct one B1 assistant. Correct answer.
  2. Travaux only take place in high voltage, whereas Interventions take place exclusively in low voltage.
  3. Travaux require no documentation, whereas Interventions require an Attestation de consignation.
  4. Interventions can involve up to 20 workers simultaneously, whereas Travaux must be performed alone.

Explanation

Under NF C 18-510, travaux are planned construction, overhaul, or modification operations organized by a Chargé de travaux (B2). Low-voltage interventions are short-duration and localized: BS covers specified elementary operations, while BR covers general interventions and may be assisted by at most one B1 executant.

Question 24French employer authorization and the actual assigned role

An electrician leaves Company A to join Company B. What happens to their Titre d'Habilitation B1V issued by Company A?

  1. The habilitation becomes void upon termination of employment; the new employer at Company B must evaluate the worker and issue a new Titre d'Habilitation. Correct answer.
  2. The habilitation remains fully valid at Company B for 3 years from its initial issue date.
  3. The habilitation automatically transfers if Company B operates in the same industrial sector.
  4. The habilitation remains valid provided the employee registers their old card with the Labour Ministry.

Explanation

An electrical habilitation is employer-specific. When an employee changes companies, the operational title issued by the former employer does not transfer. The new employer must assess the assigned operations and environment, review competence and training evidence, verify any operation-specific health attestation that applies (including for B1V reinforced-vicinity work), and issue its own title.

Question 25French employer authorization and the actual assigned role

Under French labor law (Code du travail L.4131-1), what right and duty does an executant (B1/B1V) or intervention worker (BS) have if they identify a reasonable cause to believe a work situation presents a grave and imminent danger to their life or health?

  1. The right of withdrawal (droit d'alerte et de retrait): they must immediately notify management and can withdraw from the hazardous situation without penalty. Correct answer.
  2. The obligation to continue working while filing a formal written complaint within 48 hours.
  3. The right to unilaterally re-energize the entire switchboard to force an emergency trip.
  4. The obligation to execute the assigned work until an occupational inspector visits the facility.

Explanation

The actual French right of alert and withdrawal concerns reasonable grounds for a grave and imminent danger, with the relevant statutory conditions and notification. It is not a permission to create a new danger for others or disregard every unrelated work obligation. Apply the actual circumstances and qualified advice where disputed.

Question 26French employer authorization and the actual assigned role

What are the standardized nominal voltage boundaries for Low Voltage (Basse Tension - BT) in alternating current (AC) and direct current (DC) under standard NF C 18-510?

  1. 50 V < U ≤ 1,000 V in AC; 120 V < U ≤ 1,500 V in DC. Correct answer.
  2. 0 V < U ≤ 50 V in AC; 0 V < U ≤ 120 V in DC.
  3. 1,000 V < U ≤ 50,000 V in AC; 1,500 V < U ≤ 75,000 V in DC.
  4. 230 V < U ≤ 400 V in AC; 24 V < U ≤ 48 V in DC.

Explanation

Under standard NF C 18-510 and French electrical regulations, Low Voltage (Basse Tension - BT) is defined as: > 50 V and ≤ 1,000 V for alternating current (AC); and > 120 V and ≤ 1,500 V for direct current (smooth DC).

Question 27French employer authorization and the actual assigned role

What are the regulatory upper voltage limits for Extra-Low Voltage (Très Basse Tension - TBT) under NF C 18-510?

  1. Up to and including 50 V in AC, and up to and including 120 V in smooth DC. Correct answer.
  2. Up to and including 24 V in AC, and up to and including 48 V in DC.
  3. Up to and including 230 V in AC, and up to and including 400 V in DC.
  4. Up to and including 1,000 V in AC, and up to and including 1,500 V in DC.

Explanation

Très Basse Tension (TBT) encompasses all voltages from 0 V up to 50 V effective in alternating current (AC) and up to 120 V in ripple-free direct current (DC). Above these thresholds, installations enter the Low Voltage (BT) domain.

Question 28French employer authorization and the actual assigned role

What is the primary difference between a B0 executant and a B1 executant under standard NF C 18-510?

  1. B0 is for non-electrician workers performing non-electrical work (painting, civil works, cleaning) in electrical environments; B1 is for qualified electricians carrying out electrical work. Correct answer.
  2. B0 applies to high voltage, whereas B1 applies to low voltage.
  3. B0 authorizes live work, whereas B1 authorizes de-energized work.
  4. B0 authorizes leading a team of 10 workers, whereas B1 cannot lead anyone.

Explanation

In NF C 18-510: '0' designates non-electrician personnel (non-électricien) performing non-electrical tasks (e.g., a painter or mason working in Zone 1 of an electrical local); '1' designates an electrician executant (exécutant électricien) who holds electrical trade competency and performs actual electrical construction, wiring, and assembly.

Question 29French employer authorization and the actual assigned role

An employee's employer-issued title lists both B1V and BS. How must the employee apply those symbols during an assigned task?

  1. Use only the role and limits matching the assigned operation: follow B2/B2V direction when acting as B1V, or remain within the listed elementary-intervention scope when acting as BS. Correct answer.
  2. Combine the symbols into a new autonomous work-leader authority for any low-voltage task.
  3. Use B1V proximity authority to expand every BS intervention beyond the BS terminal-circuit limits.
  4. Choose whichever symbol is more convenient after work begins, without regard to the employer's instructions.

Explanation

A title may contain more than one symbol, but their privileges do not merge into a broader role. For electrical work as B1V, the executant follows the instructions and supervision of the designated B2/B2V or applicable BR leader. For an elementary intervention as BS, the worker acts only within the listed BS operation, circuit, protection, conductor, and vicinity limits. The employer's assignment and instructions determine which role applies.

Question 30French employer authorization and the actual assigned role

Does holding a Titre d'Habilitation BS give a maintenance employee permanent carte blanche to perform any electrical repair anywhere on company property without employer work instructions?

  1. No; the employee can only intervene within the assigned operational framework, specific mission orders, and authorized premises designated by the employer. Correct answer.
  2. Yes; a BS holder has universal, unrestricted authority across all electrical installations nationwide.
  3. Yes; once habilitated, an employee is free to undertake any freelance electrical contracting on site.
  4. No; a BS holder must obtain permission from the municipal mayor before each task.

Explanation

An electrical habilitation is not an unrestricted license. The employer issues the Titre d'Habilitation with specified geographical locations, premises, and precise assignment limits. The BS operator only intervenes when formally assigned a task (ordre d'intervention or mission directive) by their supervisor within their authorized competency scope.

Question 31B1 and B1V execution within a controlled work arrangement

In the stated planned-work arrangement for a separate team under B2, does holding only B1/B1V authorize the executant to provide consignation for that team?

  1. No; consignation of an installation for work can only be carried out by a Chargé de consignation (BC). Correct answer.
  2. Yes; any B1V worker can consign an installation provided it is below 400 V.
  3. Yes; if the Chargé de travaux gives verbal permission over the phone.
  4. No; consignation must always be performed by the company's chief executive officer.

Explanation

Under standard NF C 18-510, the consignation of an electrical installation is an autonomous safety procedure strictly reserved for a designated Chargé de consignation (BC). A B1 or B1V worker is an executant and has no authority to consign an installation or issue an attestation de consignation.

Question 32B1 and B1V execution within a controlled work arrangement

During a work shift, the Chargé de travaux (B2) leaves the site for two hours. Can the B2 designate a B1V executant to take over the role of Chargé de travaux in their absence?

  1. No; a B1V cannot assume the responsibilities of a Chargé de travaux; work must stop or another habilitated B2 must be designated. Correct answer.
  2. Yes; a B1V can temporarily replace a B2 for up to 4 hours without formalities.
  3. Yes; provided the B1V worker wears high-visibility clothing.
  4. Yes; as long as no energized circuits are within 3 meters.

Explanation

A B1 or B1V executant lacks the legal title, training, and employer authorization to act as a Chargé de travaux (B2). If the B2 must leave the worksite and no other qualified B2 is formally designated to take charge, work within the zone must be temporarily suspended.

Question 33B1 and B1V execution within a controlled work arrangement

Who is responsible for precisely marking out the safe work zone (délimitation de la zone de travail) and giving the formal order to begin work to a B1 executant?

  1. The Chargé de travaux (B2). Correct answer.
  2. The B1 executant themselves upon arrival on site.
  3. The property owner or client receptionist.
  4. The supplier of the personal protective equipment.

Explanation

Under NF C 18-510, it is the sole responsibility of the Chargé de travaux (B2) to verify the de-energization (or consignation attestation), delimit the safe work zone using physical markers, inspect collective protections, conduct the safety briefing, and give the formal green light (autorisation de commencer le travail) to team members.

Question 34B1 and B1V execution within a controlled work arrangement

What information must a B1 executant receive from the Chargé de travaux (B2) during the mandatory safety briefing before starting work?

  1. The exact boundaries of the work zone, specific environmental risks, collective protections installed, required PPE, and emergency procedures. Correct answer.
  2. The wholesale pricing and profit margin of the installed cables.
  3. The personal bank account details of the electrical subcontractor.
  4. Only the estimated time of the afternoon lunch break.

Explanation

Prior to starting any work, the Chargé de travaux must gather the team and deliver a comprehensive safety briefing explaining: the nature of the task, the exact delimited safe work zone, remaining adjacent hazards (such as live busbars), installed collective protections (screens/shrouds), mandatory PPE, and emergency actions in case of an incident.

Question 35B1 and B1V execution within a controlled work arrangement

While carrying out cable routing, a B1V executant realizes that the cable tray passes beyond the physical barrier marking the safe work zone. What must the B1V worker do?

  1. Immediately stop work and notify the Chargé de travaux (B2) to assess the situation and modify the work zone if safe. Correct answer.
  2. Step over the barrier and continue working quickly without disturbing anyone.
  3. Remove the barrier permanently and discard the warning signs.
  4. Call the municipal fire department to request an escort.

Explanation

An executant must never cross or expand the physical boundary (balisage) of the work zone on their own initiative. If the assigned task extends beyond the delimited perimeter, the worker must stop immediately, step back into the safe area, and inform the Chargé de travaux (B2), who alone can evaluate the risks and update the zone safely.

Question 36B1 and B1V execution within a controlled work arrangement

In the stated planned-work arrangement, which listed document is issued by the BC and provided to the B2 to establish the relevant consignation handoff?

  1. It is the formal legal document issued and signed by the Chargé de consignation (BC) and handed to the Chargé de travaux (B2), certifying that the installation is safely de-energized and locked out. Correct answer.
  2. It is an invoice signed by the client and the wholesale electrical supplier.
  3. It is a temporary medical fitness certificate signed by the doctor and the trainee.
  4. It is a diploma signed by the regional education rectorate.

Explanation

The 'Attestation de consignation pour travaux' is the foundational safety certificate in French electrical work. It is prepared and signed by the Chargé de consignation (BC), certifying that all isolation, locking, identification, and VAT steps have been performed, and transmitted to the Chargé de travaux (B2), who co-signs to accept handover of the safe installation.

Question 37B1 and B1V execution within a controlled work arrangement

Why is a B1 executant strictly prohibited from touching any conductor or terminal until the Chargé de travaux (B2) gives the explicit formal order to begin work?

  1. Because only the B2 has received and verified the Attestation de consignation, confirmed the VAT, checked collective protections, and established the safe perimeter. Correct answer.
  2. Because the B1 must wait for the client's accounting department to approve the labor timesheet.
  3. Because touching conductors before 10:00 AM violates municipal noise ordinances.
  4. Because low-voltage conductors can only be touched after they have cooled down for 24 hours.

Explanation

The executant acts within the actual work leader’s instructions after the relevant safety arrangements and documents have been established. The scope must match the installation and work location, with appropriate verification and protection. A familiar conductor or an old document is not permission to start touching equipment independently.

Question 38B1 and B1V execution within a controlled work arrangement

Can a worker holding a B1V habilitation perform live working (travaux sous tension - TST), such as connecting an energized feeder cable directly onto a live busbar?

  1. No; B1V authorizes working in the vicinity (voisinage renforcé) of live parts, but deliberate live work requires a specialized B1T habilitation issued under TST committee regulations. Correct answer.
  2. Yes; B1V permits all forms of live working up to 1,000 V AC without restrictions.
  3. Yes; provided another B1 worker is watching from at least 1 meter away.
  4. No; live work is strictly forbidden under all circumstances in France.

Explanation

Vicinity work (voisinage) is different from travaux sous tension (TST). The V attribute allows the specified work in reinforced vicinity; deliberate work on live parts requires the corresponding T symbol, specialized TST training under the regulated framework, an employer-issued title, and the current attestation of absence of medical contraindications.

Question 39B1 and B1V execution within a controlled work arrangement

While working inside an electrical room, a B1 executant notices that an insulating shroud (nappe isolante) placed over live busbars has partially slipped and exposed bare conductors. What must the B1 executant do?

  1. Immediately alert all nearby workers, step back from the hazard, and notify the Chargé de travaux (B2) to have the protection securely repositioned. Correct answer.
  2. Push the shroud back into place using bare fingers while looking away.
  3. Ignore the shroud as long as they are working more than 10 cm away.
  4. Cut the shroud into smaller pieces with wire cutters.

Explanation

An executant must never attempt to adjust, touch, or replace a displaced protective shroud over live parts without authorization, specific procedure, and required PPE. The executant must immediately warn colleagues, avoid the unshielded live area, and alert the Chargé de travaux (B2), who will re-secure the collective protection.

Question 40B1 and B1V execution within a controlled work arrangement

Can an electrician holding only a B1 habilitation be dispatched to work completely alone on an electrical installation?

  1. No; an executant (B1) must always work under the direction and supervision of an appointed Chargé de travaux (B2) or Chargé d'intervention (BR). Correct answer.
  2. Yes; as long as the worker carries a mobile phone with full battery charge.
  3. Yes; if the installation is located inside an unoccupied office building.
  4. Yes; provided the worker has more than five years of general construction experience.

Explanation

The B1 role is an executant working within the relevant directed arrangement, not an independent general-intervention authorization. Applicable direction, work boundaries and safety oversight must be established for the actual assignment. A different symbol or arrangement is not acquired merely because the person has enough experience or is briefly alone.

Question 41B1 and B1V execution within a controlled work arrangement

At the conclusion of planned electrical work, what document signals that the work team has finished, all workers and tools have cleared the area, and power may be safely restored?

  1. The 'Avis de fin de travail' (Notice of Completion of Work), completed and signed by the Chargé de travaux (B2) and returned to the Chargé de consignation (BC). Correct answer.
  2. A verbal message left on the building manager's answering machine.
  3. The B1 executant's personal daily timesheet.
  4. The initial equipment delivery packing slip.

Explanation

The official formal document ending the work is the 'Avis de fin de travail'. Once the Chargé de travaux (B2) has ensured all tools and materials are removed, all team members (including B1/B1V executants) are evacuated and informed that the installation will be re-energized, the B2 signs this notice and hands it back to the Chargé de consignation (BC) to initiate de-consignation.

Question 42B1 and B1V execution within a controlled work arrangement

When the Chargé de travaux announces that work is ended and the installation is about to be re-energized, what must every B1/B1V worker immediately do?

  1. Immediately gather all their personal tools, remove any temporary scrap, evacuate the work zone, and treat the installation as fully live from that exact moment. Correct answer.
  2. Quickly touch the terminals with bare hands to double-check they are not hot.
  3. Remain seated inside the panel enclosure to monitor the switch contacts closing.
  4. Continue working until the main breaker physically makes an audible click.

Explanation

As soon as the notice of completion is announced, all workers must immediately evacuate the work zone, remove their tools, and fundamentally alter their mindset: from this moment on, the installation must be considered fully energized (considéré sous tension), even if actual switching has not yet taken place.

Question 43B1 and B1V execution within a controlled work arrangement

A B1 executant discovers that the assigned task would extend beyond the work zone and instructions set by the B2 work leader. What must the B1 do?

  1. Stop and report the scope change to the B2; work may resume only after the leader reassesses and gives instructions within a safe, authorized zone. Correct answer.
  2. Continue independently because a B1 may enlarge the work zone whenever needed.
  3. Perform a new consignation and issue an attestation to the B2.
  4. Ask an unhabilitated bystander to watch the nearby live parts while the B1 continues.

Explanation

A B1 is an executant working under the B2's direction. The B1 must respect the task, boundaries, and safety instructions established by the leader and immediately report an unforeseen hazard or scope change. A B1 cannot independently expand the site or assume the BC/B2 responsibilities of consignation and work leadership.

Question 44B1 and B1V execution within a controlled work arrangement

While stripping a cable, a B1 executant feels a faint tingling electrical sensation when touching a metal bracket. What is the executant's immediate duty?

  1. Immediately stop work, step back, and report the tingling sensation to the Chargé de travaux (B2) for investigation. Correct answer.
  2. Ignore it as normal static electricity and continue stripping cables.
  3. Put on a second pair of cotton work gloves and finish the shift silently.
  4. Pour a bucket of water over the bracket to discharge it to earth.

Explanation

A tingling sensation (picotement) is an unmistakable warning sign of stray voltage, insulation breakdown, neutral shift, or earthing fault. The worker must stop immediately, avoid touching any conductive components, and notify the Chargé de travaux (B2), who will carry out a voltage check and trace the defect.

Question 45BS elementary intervention limits and escalation

What is the maximum allowable conductor cross-section for cables and wires connected during a BS elementary intervention?

  1. Maximum 6 mm² copper (or 10 mm² aluminum). Correct answer.
  2. Maximum 0.5 mm² copper only.
  3. Maximum 50 mm² copper.
  4. Maximum 240 mm² aluminum.

Explanation

Under NF C 18-510 Clause 10.2.1, conductor connections and terminations performed during a BS intervention are strictly limited to conductor cross-sections not exceeding 6 mm² for copper conductors (or 10 mm² for aluminum conductors). Larger cross-sections correspond to heavier distribution circuits reserved for BR/B2 electricians.

Question 46BS elementary intervention limits and escalation

Assume the employer has assigned a listed BS task on a suitable de-energized terminal circuit, without vicinity exposure, and all actual BS limits apply. A maintenance worker holding BS must replace a damaged 230 V wall switch with an identical model on a compliant terminal circuit. May the worker do so?

  1. Yes; identical replacement of a switch is within BS scope after mise en sécurité and VAT, provided the circuit remains within the BS limits and outside reinforced vicinity. Correct answer.
  2. No; BS may replace lamps but never an identical switch.
  3. Yes, but only while the switch terminals remain energized.
  4. No; any de-energized switch replacement requires a B2T live-work title.

Explanation

The stated listed replacement or connection can fit BS only with all actual terminal-circuit, electrical-limit, de-energization, no-vicinity and assignment conditions satisfied. It does not permit alteration of the upstream circuit, general fault finding or replacement of arbitrary internal appliance parts. Written recognition is not practical authorization to perform the task.

Question 47BS elementary intervention limits and escalation

Assume the employer has assigned a listed BS task on a suitable de-energized terminal circuit, without vicinity exposure, and all actual BS limits apply. Can a BS holder replace a damaged standard 230 V wall power socket (prise de courant) with a new identical socket on an existing terminal circuit?

  1. Yes; replacing identical socket outlets, switches, or light fittings on a terminal circuit is fully within the authorized scope of a BS intervention. Correct answer.
  2. No; sockets can only be replaced by a worker holding a high-voltage HC title.
  3. No; a BS holder is only allowed to touch plumbing fixtures.
  4. Yes; but only if the circuit breaker is left switched ON.

Explanation

The stated listed replacement or connection can fit BS only with all actual terminal-circuit, electrical-limit, de-energization, no-vicinity and assignment conditions satisfied. It does not permit alteration of the upstream circuit, general fault finding or replacement of arbitrary internal appliance parts. Written recognition is not practical authorization to perform the task.

Question 48BS elementary intervention limits and escalation

When replacing a blown fuse cartridge on a terminal circuit, what strict condition must a BS operator fulfill?

  1. The replacement fuse must be identical in caliber (current rating in amperes), voltage rating, breaking capacity, and blowing curve (such as gG or aM). Correct answer.
  2. The replacement fuse should have twice the ampere rating to ensure it will not blow again.
  3. The blown fuse can be replaced with a copper screw or wire if a replacement fuse is not in stock.
  4. Any high-voltage HTA fuse cartridge may be substituted.

Explanation

NF C 18-510 mandates 'remplacement à l'identique'. The BS operator must install an identical fuse with identical electrical characteristics: nominal current, operating voltage, breaking capacity (pouvoir de coupure), and trip curve (gG for general use, aM for motor protection). Substituting higher ratings compromises fire protection and risks cable destruction.

Question 49BS elementary intervention limits and escalation

Assume the employer has assigned a listed BS task on a suitable de-energized terminal circuit, without vicinity exposure, and all actual BS limits apply. A BS technician needs to connect a new domestic electric water heater (cumulus) to an existing terminal junction box. What are the rules regarding terminal connection under BS?

  1. The connection must be made on an existing terminal block (bornier) or socket designed for that purpose on a de-energized circuit (≤ 32 A), without modifying the upstream circuit. Correct answer.
  2. The technician can solder the wires directly onto the live distribution panel busbar.
  3. The connection must be made while holding the bare wires in bare hands to feel for current.
  4. The technician must extend the circuit by 50 meters with unanchored flexible cords.

Explanation

The stated listed replacement or connection can fit BS only with all actual terminal-circuit, electrical-limit, de-energization, no-vicinity and assignment conditions satisfied. It does not permit alteration of the upstream circuit, general fault finding or replacement of arbitrary internal appliance parts. Written recognition is not practical authorization to perform the task.

Question 50BS elementary intervention limits and escalation

A client asks a BS-habilitated maintenance worker to install a brand new circuit breaker in the main electrical distribution panel and run a new 20-meter cable across the building to add three new wall sockets. Can the BS worker do this?

  1. No; a BS worker is strictly prohibited from creating new circuits, pulling new distribution lines, or modifying distribution switchboards; this requires a qualified electrician (B1/B2). Correct answer.
  2. Yes; as long as the total length of the cable is under 50 meters.
  3. Yes; if the client pays an additional fee.
  4. Yes; because adding circuit breakers is considered an elementary intervention.

Explanation

Under NF C 18-510 Clause 10.2, the creation of new circuits, installation of new circuit breakers in distribution panels, routing of new cables, or modification of an electrical installation's design are classified as 'Travaux' (construction work) and require qualified electricians holding B1 (under B2) or B2. BS is strictly limited to maintenance/replacement on existing terminal circuits.