EMC and LVD: the electrical safety baseline for robot hardware
EMC and LVD: the electrical safety baseline for robot hardware
When a Chinese robot manufacturer ships a collaborative arm or an AGV to Europe, the first technical hurdle is not performance but compliance with two directives: the Electromagnetic Compatibility (EMC) Directive 2014/30/EU and the Low Voltage Directive (LVD) 2014/35/EU. These set the baseline for electrical safety and electromagnetic interference, and they have direct implications for after-sales modifications. Yet many manufacturers treat them as a paperwork exercise, only to discover that a simple field modification—like swapping a power supply or adding a sensor—can invalidate the declaration of conformity and create legal exposure for the importer and the service network.
The EMC directive requires that equipment does not generate electromagnetic disturbances that exceed a level allowing radio and telecommunications equipment to operate as intended, and that it has an adequate level of immunity to electromagnetic disturbances. The LVD applies to electrical equipment with a voltage rating between 50 and 1000 V for alternating current and between 75 and 1500 V for direct current, ensuring that it does not endanger persons, domestic animals, or property. Robots and their charging infrastructure fall squarely within these scopes, but the practical application is nuanced.
What the directives actually cover
The LVD is not a component-level standard but a safety framework. It requires that equipment be designed and manufactured so that it is safe under normal and foreseeable misuse. For robots, this means protecting against electric shock, fire, mechanical hazards, and radiation. The EMC directive, on the other hand, is about coexistence: a robot must not disrupt nearby electronics, and it must continue to function correctly in the presence of typical electromagnetic fields. Both directives are ‘New Approach’ directives, meaning they set essential requirements and rely on harmonized standards to provide a presumption of conformity.
For a robot, the relevant harmonized standards often include EN 60204-1 for electrical equipment of machinery (under the Machinery Directive, but referenced for LVD), and EN 61000-6-2 or EN 61000-6-4 for EMC immunity and emission. However, the directives themselves do not mandate specific tests; they leave that to the manufacturer’s risk assessment. This flexibility is both a blessing and a curse: it allows for innovation but also leads to inconsistent compliance across products.
Power and charging infrastructure: a hidden compliance trap
The charging station for a robot is a standalone product in the eyes of the directives. It has its own power supply, often a 230 V AC input and a DC output to the battery. The LVD applies to the charging station if the output voltage exceeds 75 V DC, which is common for industrial robots. The EMC directive applies to the entire system, including the charger, because it can emit conducted and radiated emissions. A common mistake is to assume that a CE-marked charger is sufficient, but the robot manufacturer is responsible for the final system’s compliance. If the charger is modified—say, to increase charging speed—the EMC characteristics may change, and the entire system may need to be re-evaluated.
After-sales modifications are where the directives become particularly relevant for a service network. Consider a scenario: a customer requests a higher-capacity battery for a mobile robot. The battery is a component, but its integration affects the charging circuit and the electromagnetic profile. Under the LVD, the modified robot must still be safe; under the EMC directive, it must still meet emission and immunity limits. The service network must ensure that any modification is assessed and, if necessary, the conformity assessment is updated. This is not a theoretical concern—it is a legal requirement that the person placing the product on the market (or the importer) holds the technical documentation.
The role of the service network in maintaining compliance
For a service network being set up, such as Robanchor, the practical implication is that every repair or upgrade must be documented and evaluated against the original conformity assessment. This requires access to the technical file, which the manufacturer must provide under the directives. In practice, many Chinese manufacturers are reluctant to share full technical documentation, but without it, the service network cannot legally certify a modification. This is a critical gap that the network must address in its contracts.
Moreover, the directives require that the person responsible for compliance—often the manufacturer or the authorized representative—be identified on the product. If the manufacturer is outside the EU, they must appoint an authorized representative. The service network, if it acts as an importer or distributor, may inherit these responsibilities. Therefore, it is essential to clarify the chain of responsibility in service agreements.
Comparison of the two directives
| Aspect | EMC Directive 2014/30/EU | LVD 2014/35/EU |
|---|---|---|
| Objective | Ensure electromagnetic compatibility (emission and immunity) | Ensure electrical safety for persons, domestic animals, and property |
| Voltage scope | No voltage limit, but applies to equipment that can cause or be affected by electromagnetic disturbances | 50–1000 V AC, 75–1500 V DC |
| Key requirements | Limit emissions; adequate immunity | No danger from electrical, mechanical, thermal, or radiation hazards |
| Harmonized standards | EN 61000-6-2 (immunity), EN 61000-6-4 (emission) | EN 60204-1 (electrical equipment of machinery), EN 62368-1 (audio/video and IT) |
| Conformity assessment | Internal production control (Module A) for most equipment; technical documentation | Internal production control (Module A) for most equipment; technical documentation |
| After-sales impact | Modifications may affect EMC; re-testing may be needed | Modifications may affect safety; risk assessment must be updated |
Practical steps for after-sales modifications
When a modification is proposed, the service network should follow a structured process. First, assess whether the modification affects the voltage, current, or electromagnetic characteristics. If it does, the modification is ‘substantial’ and requires a new conformity assessment. Second, document the change in the technical file, including the rationale and any test results. Third, if the modification is performed by the service network, it must have the authority from the manufacturer to do so; otherwise, the network becomes the manufacturer for that modification and assumes full responsibility.
For example, replacing a power supply with one that has a different switching frequency can alter EMC emissions. Even if the new power supply is CE-marked, the system-level compliance may change. The service network must verify that the new component is compatible with the original EMC assessment, or conduct new tests. Similarly, upgrading the battery management system may affect the charging voltage and thus the LVD compliance.
It is also important to note that the directives do not require re-certification for every minor repair, but they do require that the product remains in conformity. A repair that restores the original condition is fine, but a repair that introduces a different component is a modification. The line is not always clear, and the service network should err on the side of caution.
Country-specific variations and verification
While the directives are harmonized across the EU, enforcement and market surveillance vary by member state. Some countries have stricter penalties for non-compliance, and some require registration of economic operators. For instance, Germany’s market surveillance authority (Marktüberwachung) is known for proactive checks, while other countries may be less active. The service network must be aware of these differences and ensure that its documentation is in order, especially if it operates across borders.
Additionally, the directives are periodically updated, and harmonized standards are revised. It is essential to check the latest versions of the standards and the Official Journal of the EU for the list of harmonized standards. The service network should maintain a subscription to updates to avoid using outdated standards.
Sources
- EUR-Lex — Directive 2014/35/EU (LVD) — https://eur-lex.europa.eu/eli/dir/2014/35/eu/oj (accessed 2026-05-23)
- EUR-Lex — Directive 2014/30/EU (EMC) — https://eur-lex.europa.eu/eli/dir/2014/30/eu/oj (accessed 2026-05-23)