EU Low Voltage Directive Internal Production Control

Under Annex III, internal production control is a manufacturer-led procedure. The manufacturer ensures and declares on its sole responsibility that the electrical equipment satisfies the LVD requirements that apply to it. Testing may be performed by an external laboratory, but the manufacturer still owns the conformity decision and declaration.

A usable LVD release file connects four records: the product scope and safety-objective assessment; the technical documentation; the manufacturing controls that keep series production aligned with the assessed design; and the signed EU declaration with CE-marking evidence. A pass report without those links is not the complete Annex III record.

Annex III requires the manufacturer to establish technical documentation that makes it possible to assess conformity with the relevant LVD requirements. The file must include an adequate analysis and assessment of risks and cover, as relevant, the design, manufacture, and operation of the electrical equipment.

The technical file should allow a reviewer to reconstruct the conformity basis without relying on project memory. It should identify the model and assessed configuration, explain drawings and circuit schemes, connect tests and calculations to the safety objectives, and show which standards or other technical solutions address each material risk.

Harmonised standards are voluntary. Compliance with a standard or part whose reference is published in the Official Journal gives a presumption of conformity only for the Annex I safety objectives covered by that standard or part. The Module A file should record the exact edition and amendments used, full or partial application, the covered risks, and any limitation or withdrawal date that affects the claim.

The file still needs a product-specific risk assessment. The LVD guide explains that a product may use techniques or present risks that were not addressed when a harmonised standard was drafted.

The manufacturer must take the measures necessary so the manufacturing process and its monitoring keep manufactured equipment in line with the technical documentation and the applicable LVD requirements.

After conformity has been demonstrated, the manufacturer draws up the written EU declaration of conformity for the product model and affixes CE marking to each compliant item before it is placed on the market. The manufacturer must keep the declaration with the technical documentation available to national market surveillance authorities for 10 years after the equipment is placed on the market.

The release record should identify who approved the assessed design, who accepted test deviations, which production specification and inspection plan apply, which declaration revision covers the unit, and who verified the CE marking and required product information. A failed release check or unresolved safety gap stops the LVD release decision.