Introduction
In the world of electrical engineering, it is much more than just a routine chore: the documentation of electrical systems and machines. Not only is it legally required, but it is also the most important tool for maintenance, expansion, and troubleshooting in complex systems. In many companies, however, it is neglected or maintained only incompletely – with serious consequences.
In this comprehensive article, you will learn:
- Why the documentation of electrical systems and machines is so crucial
- Which standards, regulations, and minimum requirements apply
- How structured and practical documentation should be organized
- Which tools and methods make creation and maintenance easier
- How to avoid typical mistakes and benefit sustainably
- How to significantly increase the availability and safety of your electrical systems with end-to-end documentation
Table of Contents
1. Why professional documentation is indispensable
1.1 Legal requirements
The Industrial Safety Ordinance (BetrSichV), the Occupational Health and Safety Act, and various VDE standards require complete and up-to-date documentation of electrical systems. Responsibility lies with the operator, and in the case of modifications or conversions, also with the executing company.
If documentation is missing or incomplete, it can lead to:
- Delays during commissioning
- Problems during safety inspections
- Liability risks in the event of damage
- Refusal of machine acceptance by experts
- Fines and sanctions by regulatory authorities
1.2 Technical and economic relevance
Documentation serves not only to fulfill compliance requirements, but also for:
- Rapid fault diagnosis in the event of malfunctions
- Efficient spare parts procurement through clear component specifications
- Optimized maintenance planning via structured maintenance schedules
- Integration into digital maintenance systems (predictive maintenance)
In short: Good documentation saves time, money, and hassle – especially in industry.
2. What needs to be documented?
2.1 Mandatory components according to standards
According to DIN EN 60204-1, VDE 0100, VDE 0113, and DIN EN 61439, at least the following documents are required:
- Circuit diagrams and schematics
- Terminal diagrams and wiring lists
- Parts lists of the components used
- Circuit and functional descriptions
- Cable lists / connection layouts
- Protection concepts and safety-related functions (SIL / PL)
- System schematics, assembly drawings, control cabinet layouts
- Test reports, CE declarations, commissioning reports
- Maintenance manual / operating instructions / user manual
2.2 Additional, useful documentation
- Network calculations, voltage drop verifications
- Measured values from initial and periodic testing
- Risk and hazard assessments
- Training materials for operators
- History of modifications or expansions
- Links to software versions, control programs, and safety data
Particularly in the context of Industry 4.0, complete digital documentation becomes the foundation of system communication.
3. Which standards and regulations are relevant?
| Standard / Regulation | Table of Contents |
|---|---|
| DIN EN 60204-1 | Safety of electrical machinery |
| DIN EN 61439 | Low-voltage switchgear and controlgear assemblies requirements |
| DIN VDE 0100 | Erection of electrical installations |
| DIN VDE 0113 | Electrical equipment of machines |
| BetrSichV (German Ordinance on Industrial Safety and Health) | Operator obligations for plant safety |
| Machinery Directive 2006/42/EC | CE marking, technical documentation |
| DGUV Regulation 3 | Recurring inspections of equipment |
| DIN EN ISO 12100 | Risk assessment and risk reduction |
💡 Tip: Regularly check whether your documentation complies with current standards – especially in the event of modifications.
4. Structure of professional documentation
4.1 Recommended structure
A well-structured documentation follows this outline:
- Cover page (system, creator, date, version number)
- Table of contents (with page references)
- System overview / plant diagram
- Circuit diagrams and schematics
- Terminal diagrams, wiring lists
- Device list / parts list
- Functional description
- Safety functions (e.g., emergency stop, light curtain)
- Inspection reports (e.g., DGUV V3)
- CE Declaration of Conformity
- Maintenance instructions / operating manual
- History / modifications / updates
- Software versions and control logic (PLC programs)
4.2 Formatting and Design
- Consistent layout, e.g., in accordance with DIN 82045
- Version control and revision history
- Clear file names and document numbers
- Electronically searchable PDFs and editable source files
- Use of a DMS (Document Management System) or CAE system
A consistent structure saves search time, prevents errors, and builds trust with inspectors.
5. Mistakes to Avoid – And What They Can Cost
Documentation quality is not a nice-to-have, but a directly measurable economic factor. In practice, the following typical mistakes lead to lengthy downtime, misunderstandings, and legal issues:
5.1 Missing or Incomplete Documentation
The most common and critical mistake: only incomplete, outdated, or no documents exist at all. Without a complete circuit diagram or device list, structured troubleshooting is nearly impossible – especially during shift work or staff shortages.
Consequences:
- Extended downtime during faults
- Increased personnel effort for troubleshooting
- Compromised operational safety
5.2 Outdated Schematics in the Control Cabinet
Still standard in many companies: a yellowed paper diagram in the control cabinet, last updated in 2009. Intermediate changes were "passed on by word of mouth" or kept in the foreman's head.
Consequences:
- Safety-relevant modifications are missing
- Responsibilities cannot be traced
- External technicians cannot work effectively
5.3 Unclear or duplicate designations
When cable designations are assigned twice or devices are numbered multiple times, chaos is inevitable. Consistent and uniform naming is mandatory—both on the schematic and in reality.
Consequences:
- Risk of confusion during maintenance and modifications
- Increased risk during recommissioning
- Incorrect test reports due to misassignment
5.4 No version history or change documentation
Who changed what and when—and why? Without traceable change tracking, you lose control over the technical state of the system.
Consequences:
- Loss of CE conformity following modifications
- Loss of legally compliant traceability
- Issues in insurance claims
5.5 Media disruption: Documentation on paper, data on USB, plans in folders
A widespread problem is decentralized storage: Some documents are in the office, others on a USB stick, and the rest in the control cabinet. As a result, information cannot be kept up to date or found quickly.
Consequences:
- No overall overview of the system status
- Increased susceptibility to errors during modifications
- Loss of time due to searching and inquiries
5.6 Lack of integration of software versions and control technology
Modern machines feature PLCs, HMIs, bus systems, and often multiple software versions. However, these are frequently missing from the electrical documentation—even though they are safety-relevant.
Consequences:
- Risk from unknown security vulnerabilities
- Total failure after software updates
- No possibility for quick recovery
👉 Conclusion: These errors are not only annoying, but dangerous and expensive. As a rule, they are avoidable – through consistent maintenance of documentation and professional processes.
6. The real value of complete documentation—and why you should act now
Complete, structured, and digitally accessible documentation of electrical systems is much more than just a regulation. It is a genuine competitive advantage and offers concrete added value on multiple levels:
6.1 For operators: Higher availability, lower liability risks
- Fast troubleshooting: In the event of a fault, technicians can work directly with the correct schematics – regardless of whether they are familiar with the system.
- Reduced downtime: Up-to-date documentation saves valuable minutes and hours during every breakdown.
- Legal compliance: You fulfill your obligations toward authorities, employers' liability insurance associations, and insurers.
- Safe operation: Maintained safety functions (e.g., emergency stop circuits, protective separation) protect employees and systems.
6.2 For maintenance teams: Efficient work without loss of time
- Fewer queries: Technicians find all information immediately in the documentation.
- Mobile access: Modern DMS systems allow access to schematics directly at the machine via tablet or smartphone.
- Preventive maintenance: A traceable history allows you to identify patterns early before errors occur.
- Quick training of new colleagues: Onboarding time is significantly reduced through clean documentation.
6.3 For planners, designers, and external service providers
- Faster implementation of modifications and expansions through traceable connection diagrams, cable lists, and PLC structures
- Reliable foundation for CE compliance and risk assessments
- Professional image with customers and authorities
- Reduced effort in tenders, quotation calculation, and project planning
6.4 For management: Clarity regarding your system status
- Transparency in asset inventory: Which machines meet which standards? Which safety functions are installed where?
- Investment protection: Existing documentation can continue to be used during modifications and modernizations.
- Digitalization advantage: Documentation is the first step toward true Industry 4.0 integration of your electrical infrastructure.
➡️ Conclusion: Those who document, win. Your documentation is your insurance policy, your knowledge repository, and your efficiency driver. And it can be expanded at any time – if you start today.
7. Documentation throughout a system's lifecycle
Created once and filed away? That is not enough.
The documentation accompanies the system throughout its entire lifecycle:
- Planning and engineering – Recording all requirements and risks
- Construction and commissioning – Adaptation to the actual setup
- Operation and maintenance – Supplementing with measurement data and maintenance reports
- Modifications / Expansions – Maintaining the version history
- Decommissioning / Dismantling – Dismantling concepts, disposal records
➔ Every phase requires updating and maintaining the documentation. This is the only way to keep your documentation valuable.
Conclusion: Documentation is not an appendix, but a central system element
Anyone who believes that documentation is merely an effort misjudges its true value: It is risk management, investment protection, and a productive factor all at once. Modern tools make creation and maintenance efficient and practical.
Whether as a planner, operator, or maintenance technician: Everyone involved benefits from standards-compliant, complete, and well-structured documentation.
➔ Want to take your electrical system documentation to the next level? Contact us for advice, software recommendations, or a customized optimization concept.
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