Inspection report, risk class & liability

For employers, a NEN 3140 inspection is not just a technical act, but also a legally relevant document. This guide covers how NEN 3140 relates to the statutory duty of care, how the inspection interval is determined, and what is at stake in the event of an incident.

NEN 3140 as an implementation of the Arbowet duty of care

NEN 3140 is not itself a legal obligation — it is a standard, not a law. The legal obligation stems from the general duty-of-care articles of the Arbowet (Dutch Working Conditions Act), which require an employer to provide a safe working environment. In practice, NEN 3140 functions as the recognized "state of the art": the way an employer demonstrably fulfils that duty of care for electrical installations and work equipment. An employer who does not follow NEN 3140 must be able to demonstrate compliance with the duty of care in some other way — in practice, that is rarely simpler than following the standard itself.

The risk-class model behind the inspection interval

NEN 3140 uses an (informative) risk-class model to determine an installation's inspection interval, often summarized in three broad classes:

• D1 — minimal risk (for example, an office environment with only regular ICT equipment).
• D2 — limited but real risk (for example, a small workshop).
• D3 — elevated risk (for example, a heavy industrial environment or a shipyard).

In practice this translates into an inspection interval of roughly 5 years for low-risk office installations down to 1–3 years for installations with elevated load, moisture, or mechanical wear (see the base Inspection guide for the concrete interval table).

Note: the underlying points system with which NEN 3140 translates an installation's usage class, environmental class and load class into a concrete interval is set out in the standard itself (a paid publication) and cannot be reproduced from freely accessible sources. This guide describes the method in broad outline; consult the full NEN 3140 text for a concrete point count.

What belongs in an inspection report

A NEN 3140 inspection report is more than a "pass/fail" stamp. Among other things, it should contain:

• Identification of the installation/work equipment and the measuring equipment used for the inspection (including calibration status — see the calibration guide).
• The determined risk class and the resulting inspection interval.
• All defects found, distinguishing between direct danger (requires immediate action) and points of attention (may wait until the next round).
• The name and competence level (VP) of the person who carried out the inspection and signed the report.

Liability in the event of an incident

In the event of an electrical accident, an employer can, in addition to civil liability, also be prosecuted under criminal law:

• Arbowet article 32 makes it a criminal offence to intentionally or negligently violate a working-conditions regulation when this causes, or can be expected to cause, danger to life or serious harm to an employee's health.
• In the case of death or serious injury due to negligence, the Dutch Criminal Code (Wetboek van Strafrecht) may also come into play (death or grievous bodily harm through negligence).
• In addition, the Dutch Labour Inspectorate (Nederlandse Arbeidsinspectie) can impose administrative fines; these are typically in the order of several thousand euros per violation, depending on severity and company size.

A demonstrable, up-to-date, and correctly executed NEN 3140 inspection process — with a complete report and a valid VP appointment — is, in this context, an employer's most important line of defence.

Common mistakes

1. Confusing NEN 3140 with a legal obligation in its own right — it is the implementation of the Arbowet duty of care, not a standalone law; this distinction matters in a legal dispute.
2. Ignoring the risk-class model and applying one fixed interval to all installations — an office environment and a production environment with moisture and mechanical load require a fundamentally different interval.
3. Accepting an inspection report without mention of the calibrated measuring equipment used — without that mention, the traceability of the inspection result itself cannot be demonstrated (see the calibration guide).
4. Assuming a VOP may independently complete and sign an inspection report — that authority lies with the VP; the VOP may assist, but does not carry final responsibility.

Related

• Periodic inspection according to NEN 3140
• Calibration of test equipment — traceability and interval
• RI&E for Electrical Equipment