What is NEN 3140?
NEN 3140 is a Dutch standard for working safely on and with electrical installations and equipment in the low-voltage category. This standard is mandatory for employers who are responsible for the safe use of installations within their organization.
The standard sets requirements for:
- The safe condition of electrical installations
- Periodic testing and inspection
- The competence of personnel
- The maintenance and management of electrical systems
By complying with NEN 3140, you prevent accidents, liability risks, and downtime in your processes.

NEN 3140: safe business operations start with a reliable installation
In a business environment where electrical installations are used daily, safety is not optional—it is a necessity. The NEN 3140 standard prescribes how installations must be used, maintained, and managed safely. Technotron carries out thorough NEN 3140 inspections, with clear reports and an official certificate as proof of compliance.
NEN 3140 inspection: mandatory and wise
An NEN 3140 inspection is mandatory for organizations that operate electrical installations. The inspection determines whether the installation can be used safely and provides insight into possible defects or risks.
At Technotron we check, among other things:
- Thermal irregularities via thermographic inspection
- Leakage currents or earth faults
- Wear or damage to components
- Compliance with standards such as SCIOS Scope 8 & SCIOS Scope 10
Afterwards you will receive a detailed report and practical recommendations.
NEN 3140 inspection: periodic and professional
A periodic NEN 3140 inspection is essential to ensure continuous compliance with legal requirements and safety standards. Depending on the usage conditions, we recommend inspection intervals of 1 to 5 years.
The advantages of an inspection by Technotron:
- Experienced inspectors with up-to-date knowledge of NEN standards
- Use of advanced measuring and analysis equipment
- Clear reports with well-structured findings
- Directly applicable advice for maintenance or adjustments
NEN 3140 certificate: assurance for your organization
After each inspection you will receive an official NEN 3140 certificate from Technotron. This document proves that your electrical installation has been declared safe and complies with the standard.
The NEN 3140 certificate is indispensable for:
- Internal and external audits
- Liability issues
- Insurance matters
- Inspections by the Labor Inspectorate
With a certificate from Technotron, you are assured of expert inspection and full compliance.
Why choose Technotron?
Technotron is an expert in testing, inspecting, and certifying electrical installations. Our strength lies in our integrated approach:
- Everything under one roof: from inspection to reporting and follow-up
- High-level mechatronics expertise
- Proactive advice and customized solutions
- Fast service thanks to short lines and a flexible team
- Internationally active, with the quality of Dutch reliability
When do you need an NEN 3140 inspection?
Every organization with electrical installations is required to have them inspected periodically. Also in cases of:
- New installations or major renovations
- Transfer of buildings/installations
- Accidents or incidents involving electrical systems
- Commissioning of second-hand equipment
Don’t wait until it’s too late, schedule an inspection in time and avoid risks.
Have your installation inspected by Technotron
At Technotron, we not only carry out inspections in accordance with NEN standards, but we also advise you on the importance of SCIOS Scope 8 and 10. Both standards complement each other and together ensure a safe and reliable working environment.
Looking for a reliable partner for your NEN 3140 inspection? Choose Technotron. We provide assurance, safety, and complete documentation.
Contact us for a free quote or more information about our inspection and testing services.