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DGUV 209-093 · Key Terms

HV Glossary –
Key Terms for High-Voltage Safety

The most important terms for high-voltage training, HV safety and DGUV 209-093 – explained clearly and practically.

Qualifications & Personnel

Job Roles & Qualification Levels

Who is allowed to do what on HV vehicles? DGUV 209-093 defines clear roles and qualification levels.

Fachkundige Person Hochvolt (FHV)
An electrically qualified person authorised to independently de-energise HV vehicles and work on them in the voltage-free state.
→ Term explained
Fachkundig unterwiesene Person (FuP)
Qualification Level 1S/1E – may carry out general work on HV vehicles under supervision of an FHV.
→ Course: Level 1S/1E
vEFK – Responsible Electrical Expert
Legally appointed expert under DGUV Regulation 3 responsible for overseeing all electrical work within a company.
→ Term explained
Annual HV Safety Briefing
Recurring mandatory briefing for all HV-qualified employees – required by law, including for FuP (Level 1S).
→ Term explained
Automotive Tech: HV Entry Route Level 2S
Automotive mechatronics technicians qualified from 2013 can complete Level 2S in ~16 teaching units – instead of 80 for Entry A.
→ Term explained
E-Learning in HV Training
Which content can be completed online – and where DGUV 209-093 requires in-person sessions with practical exercises.
→ Term explained
Standards & Legal Basis

Standards & Legal Framework

Which regulations apply to working on HV vehicles?

DGUV Information 209-093
The primary German regulation for HV qualifications – defines levels, content and requirements for instructors.
→ Term explained
BGV A3 / DGUV Regulation 3
German electrical safety regulation – defines the Elektrofachkraft (qualified electrician) and establishes testing obligations for electrical equipment.
→ Term explained
HV Risk Assessment
Mandatory document under BetrSichV and ArbSchG – must be prepared and updated by the employer before any HV work.
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HV Qualification Record
Documented proof of HV qualification – a continuous obligation for employers; relevant for liability in the event of an accident.
→ Term explained
Equipment & Test Instruments

Protective Equipment & Measuring Devices

Which PPE and measuring instruments are required for HV work?

HV PPE (Protective Equipment)
Mandatory PPE for HV work: insulating gloves Class 0/1, CAT III multimeter, insulated tools to EN 60900 and face shield.
→ Term explained
CAT-III Measuring Device
Required measurement category for voltage-free verification on HV vehicles – protection up to 600 V (CAT III) or higher.
→ Term explained
VDE-Tested Tools (EN 60900)
Insulated tools with 1,000 V protection to EN 60900 – mandatory for all work near active HV components.
→ Term explained
Insulating Gloves Class 0/1
PPE to EN 60903 – Class 0 up to 1,000 V, Class 1 up to 7,500 V. Required when de-energising and working live.
→ Term explained
Insulating Footwear at HV Work – Myth
Safety shoes do not provide HV protection – DGUV 209-093 does not require insulating footwear. What actually applies.
→ Myth debunked
Procedures & Documentation

Work Procedures & Documentation

Which procedures and records are mandatory for HV work?

HV De-Energisation
Safety procedure to shut down and lock out the HV system – mandatory prerequisite for any voltage-free HV work.
→ Term explained
Live HV Working (AuS)
Work on active HV systems without prior de-energisation – permitted only for Level 3S/3E qualified FHV specialists.
→ Term explained
HV Test Record
Mandatory documentation of every HV de-energisation: voltage readings, date, vehicle and signature of the responsible FHV.
→ Term explained
HV Work Area Barriers
Which barriers and warning signs are mandatory for HV work? Rules covering vehicles, stationary installations and test benches.
→ Term explained
Technology & Systems

HV Technology & Vehicle Systems

Technical background on HV systems in electric and hybrid vehicles.

HV System Components
Overview of the key high-voltage components in EVs: traction battery, inverter, electric motor, OBC and HV wiring harness.
→ Term explained
HV Level 2S
FHV qualification for series vehicles after SoP. Authorises independent de-energisation and work in the voltage-free state.
→ Course: Level 2S
HV Training Intervals
Annual briefing requirement and 3-year refresher cycle under DGUV 209-093 – validity rules and special cases.
→ Term explained
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