Why Qualification in High-Voltage Systems Is Essential

Electric and hybrid vehicles have long moved beyond niche markets. According to the IEA Global EV Outlook 2025, more than 17 million electric cars were sold worldwide in 2024, bringing their share of new registrations above 20 percent for the first time. At the same time, qualification requirements for workshops, training centers, and universities are increasing: without solid expertise in handling high-voltage technology, proper maintenance and repair are no longer possible.

However, working on high-voltage systems differs fundamentally from working on internal combustion engines. In addition to traditional diagnostic and repair tasks, new challenges come into focus: hazards caused by high voltage, complex interconnected systems, and special de-energization procedures.

This is where training in accordance with national safety regulations comes into play — for example DGUV 209-093 in Germany, ASE certification standards in the United States, or IMI qualifications in the United Kingdom — all of which define binding qualification requirements for working on high-voltage vehicles.

Training Requirements According to National Safety Standards

National regulations typically distinguish between defined qualification levels for work on de-energized high-voltage systems and for work on live systems.

Qualification Level for Work on De-energized HV Systems

This level qualifies skilled personnel to:

• Safely power down high-voltage vehicles
• Verify absence of voltage
• Replace components
• Recommission vehicles

Qualification Level for Working on Live Systems

This represents the highest qualification category. It permits diagnostic and maintenance work on vehicles that remain under voltage — for example, troubleshooting high-voltage batteries or relays. Such work is reserved exclusively for specially trained personnel.

For training institutions, this means: only those who can realistically replicate these qualification levels in practical training ensure that graduates are legally compliant and professionally authorized to perform such work within their respective national framework.

Why Training in High-Voltage Systems Is So Demanding

The challenge lies in the combination of electrical safety, system complexity, and didactics.

• Electrical risks: Even unintended contact with high-voltage lines can be life-threatening. Conventional protective clothing and basic knowledge are not sufficient.
• System complexity: In addition to batteries, relays, inverters, chargers, sensors, and control units all interact. A fault can occur in many different places.
• Didactic challenge: Theory alone is not enough. Learners must practice on real components — in an environment that eliminates risks.

This last point is particularly important: traditional teaching methods such as lecture-based instruction or software simulations without hardware are not sufficient. What is required are practice-oriented systems that make real HV components available in a safe environment.

Didactic Concepts: Theory Meets Practice

Effective high-voltage training requires a learning design that systematically connects practical workshop tasks with structured digital learning support. The goal is to create a coherent learning experience that combines hands-on application, technical understanding, and guided reflection.

Project-Based Learning

Learners work on realistic workshop assignments, such as:

• Diagnosing an insulation fault
• Testing HV fuses
• Replacing a defective relay

Fault scenarios are deliberately integrated to train troubleshooting skills.

Digital Learning Environments

The RXLea learning environment by Lucas-Nuelle links hardware exercises with:

• Real-world professional projects
• 3D assembly animations
• Assessments
• Automated feedback

This creates a structured learning path that connects theory and practice while promoting independent work.

This Real Experience Learning approach ensures sustainable understanding — learners not only know how something works, but also why.

Practical Implementation: Example of a Training System

A practice-oriented training system for diagnosing and maintaining high-voltage vehicles combines several key elements:

• De-energization using all common industry methods: HV service disconnects, pilot lines, soft shutdown procedures, or emergency low-voltage isolation points
• Fault simulation in safety-relevant components: Relays, HV cables, or fuses can present realistic faults that must be diagnosed and corrected
• Measurements: Voltage measurements up to 400 V, insulation and resistance tests, as well as equipotential bonding measurements on real metal components
• OBD diagnostics: Integrated diagnostic tools enable fault code reading, live data analysis, and vehicle activation
• Digital integration: Via learning environments such as RXLea, more than 25 practice-oriented projects can be completed with step-by-step guidance and automated feedback

The key advantage: learners work with real high voltage, but in an environment where injuries are prevented. This ensures maximum proximity to real workshop practice while maintaining full safety.

Benefits for Educational Institutions and Industry

The use of practice-oriented systems offers clear advantages:

• Regulatory compliance: Fulfillment of applicable national safety requirements (e.g., DGUV, ASE, IMI)
• Safe environment: Risks are minimized even though real voltages are used
• Practical competence: Learners develop real troubleshooting and repair strategies, not just theoretical knowledge
• Attractiveness: Modern training systems make education more engaging and motivating — an advantage in competition for trainees
• Investment security: Modular systems are future-proof and can be adapted to new technologies

Companies also benefit: skilled workers holding nationally recognized HV qualifications are more versatile in workshop operations, reduce risks, and increase efficiency.

Outlook: Electromobility as a Standard Qualification

What is still considered an additional qualification today will become standard within a few years: training in high-voltage systems will become a core competence for automotive service technicians and vehicle mechatronics professionals worldwide. Just as knowledge of internal combustion engines was essential in the past, the ability to work on HV systems will soon be taken for granted.

For vocational schools and training centers, this means:

• Investing today positions them as modern and attractive training partners

For workshops and industrial companies, it means:

• Qualifying skilled personnel now in order to remain competitive tomorrow

Conclusion

Electromobility is fundamentally transforming requirements in training and workshop environments. Safe work on high-voltage vehicles can only be achieved through practice-oriented training systems that combine theory and practice, meet regulatory requirements, and provide learners with a safe environment.

National regulations such as DGUV 209-093 (Germany), ASE certification frameworks (USA), or IMI qualification standards (UK) define minimum requirements — the real challenge lies in implementing them in a didactically sound and practice-oriented way. Systems that combine real high-voltage technology with digital learning pathways are a key solution.

Those who set the course today will qualify professionals who not only accompany technological change, but actively shape it — competently, safely, and with a future-oriented mindset.

Take the Next Step

Prepare your learners and technicians for the future of electromobility with a training solution that combines real high-voltage technology, regulatory compliance, and hands-on diagnostic competence.

Discover how the CarTrain system for Diagnosis and Repair of HV Vehicles enables safe, practice-oriented qualification aligned with international standards.

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Article Submitted by

Dagmar Bona

Lucas-Nülle GmbH