Electrical inspection is a regulatory requirement to ensure the safety of people and property. Whether you are an electrician, an inspection body or a facility manager, mastering the NF C 15-100 standard and verification procedures is essential. This guide details the key checkpoints, applicable regulations and best practices for documenting your inspections.
The NF C 15-100 Standard: Regulatory Framework
The NF C 15-100 standard is the reference text for low-voltage electrical installations in France. It defines the rules for design, installation and verification of electrical systems in residential, commercial and industrial buildings. Regularly updated, it incorporates technological developments and safety feedback from the field.
The main objectives of this standard are:
- Protection of people against the risks of electrocution and electric shock
- Protection of property against the risks of fire of electrical origin
- Continuity of service of electrical installations
- Maintaining compliance throughout the lifetime of the installation
In addition, Decree No. 2010-1016 of August 30, 2010 imposes verification obligations for electrical installations in workplaces, while ERP (Establishments Receiving the Public) are subject to specific periodic inspections.
Initial Verification vs Periodic Verification
Initial Verification
Initial verification takes place before the first energisation of a new installation or after a major modification. It must be carried out by an accredited body and includes:
- Visual examination of the entire installation
- Tests and measurements (continuity of protective conductors, insulation, fault loop impedance)
- Verification of compliance with plans and diagrams
- Checking of protective devices (residual current devices, fuses)
Periodic Verification
Periodic verification applies to installations in service. Its frequency depends on the type of establishment:
- Workplaces: every year (order of December 26, 2011)
- Public buildings (ERP): every year for categories 1 to 4, as per safety regulations
- Residential properties: upon sale or rental (mandatory electrical diagnostic for installations over 15 years old)
The periodic verification report must be kept on file and made available to the labour inspectorate or safety committee. Failure to carry out verification exposes the operator to criminal penalties and insurance coverage issues in the event of an incident.
Essential Checkpoints
Electrical Panel (Main Switchboard)
Check the general condition of the panel, circuit identification, presence of the single-line diagram, tightness of connections, accessibility and availability of spare space for future circuits.
Residual Current Devices
Test the operation of each residual current device (30 mA for personal protection, 300 mA for fire protection). Verify the trip time and actual trip current using a residual current tester.
Earthing
Measure the earth electrode resistance (maximum generally accepted value: 100 ohms for a 30 mA residual current device). Verify the continuity of the protective conductor between the panel and each point of use.
Sockets and Switches
Visual inspection of the condition of accessories, verification of the presence of shutters on sockets accessible to children, polarity testing and measurement of the voltage between phase and neutral.
Wiring and Conduits
Check the condition of cables (no insulation damage), compliance with minimum cross-sections for each circuit, mechanical protection of conduits and absence of overheating at connection points.
Insulation Resistance Testing
Carry out an insulation resistance measurement between live conductors and between live conductors and earth. The minimum insulation resistance is 0.5 megohms for a low-voltage installation.
Required PPE for Electrical Inspection
Inspector safety is paramount. Before any work on or near an electrical installation, the operator must have the appropriate personal protective equipment (PPE):
- Insulating gloves: suited to the installation voltage (class 00 for LV, class 0 minimum for MV). Check the expiry date of the last dielectric test.
- Anti-UV face shield: protection against electrical arcs when operating switchboards.
- Flame-retardant workwear: mandatory for work in areas at risk of electrical arcs.
- Insulating safety shoes: insulating sole compliant with EN 50321.
- Insulating mat or insulating stool: to be placed in front of electrical panels during live measurements.
- 1000V insulated tools: screwdrivers, pliers, socket wrenches compliant with IEC 60900.
Anyone carrying out an electrical inspection must hold an electrical authorisation issued by their employer, in accordance with the NF C 18-510 standard. The level of authorisation required depends on the nature of the operations: B2V or BC for low-voltage verifications, H2V or HC for high voltage.
How to Document an Electrical Inspection
A complete and well-structured electrical inspection report is essential for ensuring traceability and regulatory compliance. Here are the elements to include:
- Site identification: address, building type, name of the owner or operator
- Installation details: subscribed power, type of earthing system, commissioning date
- Nature of verification: initial or periodic, reference to the previous report
- Detailed checkpoints: each inspected element with its status (compliant, non-compliant, observation)
- Measurements taken: insulation values, earth resistance, loop impedance, residual current device trip current
- Photos and annotations: visual evidence of detected non-conformities
- Conclusions and recommendations: list of non-conformities ranked by severity, recommended compliance deadlines
Digitising the inspection report saves time and improves reliability. A tool like EasyReportGen allows you to enter observations directly in the field, add annotated photos and generate a professional PDF report in minutes.
Related Reading
- Template: Electrical Inspection Report for Public Buildings
- Template: Electrician Intervention Report
- QHSE Audit Checklist: The Essentials
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