Electrical safety of machines for EN 60204-1: a practical guide for MRO services of Ukrainian enterprises

Introduction: Why EN 60204-1 defines the security of your production

Standard EN 60204-1:2018 (Safety of machinery — Electrical equipment of machines — Part 1: General requirements) is a basic normative document for the design, installation and maintenance of electrical equipment of industrial machines. In Ukraine, its harmonized counterpart — DSTU EN 60204-1:2019 — has acquired the status of a national standard since 2020. Compliance with this standard is mandatory for enterprises that export products or use CE-marked equipment.

The standard directly affects MRO operations: from component selection to lock/unlock (LOTO) procedures, from cable marking to protection against electric shock. Ignoring the requirements of EN 60204-1 leads not only to accidents, but also to legal liability, insurance risks and production stoppages during audits.

This material has been prepared as a practical tool for service engineers, occupational health and safety specialists and MRO procurement managers.

Scope and obligation

To whom the standard applies

EN 60204-1:2018 applies to the electrical equipment of machines operating at a voltage of up to 1000 V AC or 1500 V DC, with a frequency of up to 200 Hz. The standard covers:

• Metalworking machines (lathe, milling, grinding)
• Packaging equipment
• Conveyor systems
• Industrial robots and manipulators
• Equipment for the food, pharmaceutical, chemical industry
• Mining and cement equipment
• Woodworking machines

Regulatory base in Ukraine

DSTU EN 60204-1:2019 (IDT IEC 60204-1:2016, IDT EN 60204-1:2018) is an identical translation of the European standard. Enterprises undergoing certification under the UkrSEPRO system or preparing technical documentation for CE marking under Directive 2006/42/EC (Machinery Directive) are required to ensure compliance of electrical equipment with this particular standard.

Additionally apply:

• EN 60947-1:2007+A2:2014 — low-voltage switching devices
• EN 61439-1:2011 — low-voltage complete distribution devices
• EN 60529:1991+A2:2013 — degrees of IP protection
• ISO 13849-1:2015 - security of control systems
• IEC 61508 is functional security

Key requirements: summary table

Impact on MRO operations

Changes in maintenance procedures

The standard requires that each electrical equipment maintenance operation be performed with complete de-energization and lockout (Section 5.4). In practice, this means:

• Each control cabinet must have a lockable main switch
• After disconnection, it is mandatory to check the absence of voltage with a two-pole indicator
• Capacitors ≥1 μF must have discharge devices; residual voltage ≤60 V after 5 s

Requirements for procurement of MRO components

Any electrical component must be replaced with a certified analog with identical or better characteristics. The standard expressly prohibits the installation of components without the appropriate marking (CE, conformity to the IEC/EN series). Typical mistakes when purchasing:

• Installation of circuit breakers without proven breaking capacity
• Using cables with an inappropriate flammability class (requirement — minimum IEC 60332-1-2)
• Replacing contactors with a model with a different application category (AC-3 instead of AC-4)

Documentation

Each replacement of a component is recorded in the service log with an indication of: catalog number, manufacturer, date of replacement, test results after installation. This is a requirement of section 17.2 of the standard.

Requirements for components: what must be certified

The use of components without appropriate marking automatically removes responsibility from the machine manufacturer and transfers it to the operating company.

Compliance Checklist for the MRO Manager

Below is a practical list for checking the compliance of the electrical equipment of machines with the requirements of EN 60204-1:2018 / DSTU EN 60204-1:2019:

1. The main switch is present, accessible, locked in the OFF position
2. The marking of the main switch corresponds to the symbols IEC 60417 (I/O)
3. Residual voltage after disconnection ≤60 V for 5 s
4. PE protective conductor is connected to all metal parts; resistance ≤0.1 Ohm
5. The color of PE insulation is yellow-green; N - blue; phases — black/brown/gray
6. Circuit breakers have a confirmed breaking capacity ≥ the rated short-circuit current
7. Coordination of protective devices is documented (selectivity or back-up)
8. Emergency stop button - red on a yellow background, "mushroom" type, NC contact, without auto-return
9. The emergency stop function has been tested; the operating time corresponds to category 0 or 1
10. Voltage of manual control circuits ≤120 V AC or ≤60 V DC
11. Control circuit transformers have short-circuit protection on the secondary winding
12. All conductors are marked; marking corresponds to electrical diagrams
13. Electrical diagrams are relevant; all changes are dated and signed
14. Cable entries ensure the degree of protection of the shell (IP54 minimum for industrial premises)
15. The degree of protection of the cabinets corresponds to the operating conditions (IP55 for wet, IP65 for outdoor)
16. Insulation test performed: ≥1 MΩ at 500 V DC
17. Frequency converters are equipped with EMC filters according to EN 61800-3
18. Safety relays correspond to level PL d or higher (for categories 3-4 according to ISO 13849-1)
19. A maintenance log is maintained; every component replacement is documented
20. The staff has a qualification group for electrical safety in accordance with NPAOP 40.1-1.01-97

Typical violations during audits

Based on the practice of inspections of Ukrainian industrial enterprises, the following are most often found:

1. Absence or malfunction of the main switch

The switch is locked in the ON position, the lock is missing, the handle is damaged. A violation of Section 5.3 is critical.

2. Improper grounding

The resistance of the protective connection exceeds 0.1 Ohm. Reasons: corrosion of contacts, lack of groove washers, paint under the terminal. Violation of Section 8.

3. Mismatch of emergency stop buttons

Using buttons with NO contact instead of NC; no yellow background; automatic return without confirmation. Violations of Section 10.7 and ISO 13850.

4. Outdated electrical circuits

The diagrams do not correspond to the actual condition of the equipment after the upgrades. Violation of Section 17.

5. Components without CE marking

Automatic switches, contactors or relays of unknown origin are installed. Absence of certificates of conformity in the technical documentation.

6. Exceeding the allowable voltage of the control circuits

Buttons and switches are connected to 220/380 V without an isolation transformer. Direct violation of section 9.1.1.

Liability and sanctions

Administrative responsibility (Ukraine)

According to Art. 43 of the Law of Ukraine "On Labor Protection" and Art. 41:

• Fine for an official: from UAH 340 to UAH 1,700 (minor violation)
• In the event of an accident: criminal liability under Art. 271 of the Criminal Code of Ukraine — restriction of liberty up to 2 years or deprivation of liberty up to 7 years (in case of death of an employee)
• Fine on the enterprise from the State Labor Office: up to 10 minimum wages for each violation (as of 2024 - up to UAH 80,000)

Insurance consequences

Insurance companies refuse payments if a violation is established EN 60204-1. Typical wording: "The equipment was operated in violation of safety requirements; the insured event is not recognized." The average loss from downtime due to an electrical accident in production is 15,000-50,000 EUR per day.

Loss of CE marking

Replacing a component with an uncertified analogue formally invalidates the Declaration of Conformity of the machine. The company assumes the role of manufacturer in accordance with Directive 2006/42/EC, Article 2(i). This means full legal responsibility for the safety of the machine.

Practical recommendations for MRO services

To ensure continued compliance EN 60204-1:

• Create a register of critical electrical components with compliance standard and service life
• Set the frequency of insulation tests - at least once every 12 months for equipment in normal conditions, once every 6 months - for wet/aggressive environments
• Purchase components exclusively from suppliers providing Declarations of Conformity and CE certificates
• Conduct an internal electrical safety audit quarterly using the checklist provided
• Keep stock of critical components (circuit breakers, contactors, E-Stop buttons) in stock - downtime waiting for delivery costs far more than inventory cost

Conclusion

EN 60204-1:2018 / DSTU EN 60204-1:2019 is not a formality, but the foundation of electrical safety of industrial equipment. For MRO services of Ukrainian enterprises, compliance with this standard means: correct selection of components, correct documentation, regular tests and qualified personnel.

Each replacement of an electrical component is a moment when compliance with the standard is either confirmed or violated. Choose certified components from proven manufacturers with full technical documentation.

UNITEC-D GmbH provides Ukrainian industrial enterprises with certified electrical components of leading European manufacturers — automatic switches, contactors, frequency converters, safety relays, cable products with a full package of compliance documents. View the range in the UNITEC-D E-Catalog and ensure your equipment meets the requirements EN 60204-1.

List of regulatory documents

• EN 60204-1:2018 — Safety of machinery — Electrical equipment of machines — Part 1: General requirements
• DSTU EN 60204-1:2019 — Machine safety. Electrical equipment of machines. Part 1 (IDT)
• IEC 60204-1:2016 is an international basic standard
• EN 60947-2:2017 - Low-voltage switchgear - Circuit-breakers
• EN 60947-4-1:2018 — Contactors and motor-starters
• EN 60947-5-5:1997+A2:2017 — Emergency stop devices
• ISO 13850:2015 - Emergency stop function
• ISO 13849-1:2015 — Safety-related parts of control systems
• EN 61439-1:2011 — Low-voltage switchgear and controlgear assemblies
• EN 60529:1991+A2:2013 — Degrees of protection (IP Code)
• EN 61800-5-1:2007+A1:2017 — Adjustable speed electrical power drive systems — Safety
• Directive 2006/42/EC — Machinery Directive
• Law of Ukraine "On Labor Protection" (Article 43)
• NPAOP 40.1-1.01-97 — Rules for the safe operation of electrical installations