Free Practice Questions for Habilitation Haute Tension

An electrical habilitation is the employer's recognition that a worker can safely perform specified operations. A competent internal or external trainer provides an avis après formation; only the employer issues the Titre d'habilitation. Under the rules effective from 1 October 2025, listed operations such as H1V/H2V reinforced-vicinity work also require a five-year occupational-physician attestation of absence of medical contraindications, but this should not be generalized to every symbol.

Under standard NF C 18-510, High Voltage is subdivided into two domains: HTA (Haute Tension A) covers alternating voltages from 1,000 V to 50,000 V inclusive (1,500 V to 75,000 V direct current), and HTB (Haute Tension B) covers voltages strictly greater than 50,000 V AC (greater than 75,000 V DC). Below 1,000 V AC is Low Voltage (Basse Tension - BT).

In NF C 18-510 nomenclature: 'H' stands for Haute Tension. '0' designates non-electrical personnel performing non-electrical work; '1' designates an electrical executant working under supervision; '2' designates a Chargé de travaux (work leader) who organizes and supervises the work; 'C' designates a Chargé de consignation responsible for lockout/tagout; and the letter 'V' indicates authorization to work within the reinforced vicinity zone (Zone 2 / voisinage renforcé HT).

No. NF C 18-510 has no HR general-intervention symbol equivalent to low-voltage BR. High-voltage operations use the symbol matching the role, such as H1/H2 work, HC consignation, HE special operations, or a T live-work title; BR rules must not be transferred to high voltage.

DMA is the applicable voltage distance plus the safety margin. Workers must use the current NF C 18-510 table and the installation's operating instructions for the nominal voltage rather than an improvised linear shortcut. Crossing inside the DMA enters the high-voltage live-work zone and requires the corresponding specialized authorization and procedure.

The 5 mandatory chronological steps under NF C 18-510 are: 1) Séparation (visibly disconnecting all electrical power sources using disconnectors or withdrawable breakers); 2) Condamnation (physically locking the isolation devices in the open position with padlocks and warning tags); 3) Identification (positively verifying that the isolated installation is the exact intended work site); 4) VAT (Vérification d'Absence de Tension using a dedicated capacitive detector on an insulating pole, validated by the rule-of-three); and 5) MALT/CC (Mise à la terre et en court-circuit, which is mandatory in high voltage to eliminate residual capacitive charges and induced voltages).

Unlike certain low-voltage scenarios where grounding is conditional, MALT/CC is strictly mandatory on both sides of a high-voltage work site. High-voltage cables retain significant capacitive electrostatic charges even after disconnection; adjacent energized transmission lines induce high electromagnetic voltages; and accidental re-energization or lightning strikes would create lethal flashovers without a low-impedance short-circuit path to ground.

The employer sets the title's validity and reviews whether it remains appropriate. INRS recommends refresher training about every three years for ordinary operations and earlier review after changes in duties, installations, methods, standards, or a prolonged interruption. The five-year health-attestation period for listed operations is separate from habilitation validity.