In short: At workplaces, the indoor electrical installation, grounding and lightning protection systems are inspected once a year, unless the relevant standard sets a different interval. The employer arranges the inspection; an authorized person registered in EKİPNET performs it. At the end, a signed report is issued that states clearly whether the installation can be used. Information is current as of November 9, 2026.
Who should arrange it?
In a workplace, the employer arranges the inspection. The legal basis is the Regulation on Health and Safety Requirements for the Use of Work Equipment (İş Ekipmanlarının Kullanımında Sağlık ve Güvenlik Şartları Yönetmeliği). The regulation applies to all workplaces covered by Occupational Health and Safety Law No. 6331: factories, offices, stores, schools, hotels.
The law applies to workplaces. Domestic services and self-employed people with no employees are outside its scope. So the regulation does not require an annual inspection of the installation in the apartment you live in. Still, in an old building, after a renovation, or if breakers trip often, a measurement reveals problems early.
| Workplace | Home | |
|---|---|---|
| Legal basis | Work Equipment Regulation, Annex III | Outside the scope of this regulation |
| Who arranges it | Employer | Owner, if they wish |
| Frequency | Once a year, unless the standard sets a different interval | No interval in this regulation |
| Report | Mandatory, signed, kept on file | Optional |
How often is it done?
Once a year, unless the relevant standard sets a different interval. The intervals are listed in Table 3 of the regulation’s Annex III.
| Facility | How often |
|---|---|
| Electrical installation and grounding | Once a year |
| Lightning protection | Once a year |
| Transformer, generator, battery | Once a year |
| Cathodic protection | Once a year |
The Regulation on Grounding in Electrical Installations (Elektrik Tesislerinde Topraklamalar Yönetmeliği) recommends measuring the grounding of movable equipment every 6 months.
These intervals are maximums; a risk assessment may call for more frequent inspections.
Besides the annual inspection, an inspection is required in two more cases:
- After the installation is completed, before first use.
- After a significant change (e.g., capacity increase, main feeder replacement).
What are the steps of an inspection?
Four steps: preparation, visual inspection, measurements and the report. Measurement methods are defined in the Regulation on Grounding in Electrical Installations. Since September 1, 2025, the Ministry’s mandatory inspection criteria also apply.
Preparation
The employer and the authorized person set up and approve a contract on İSG-KATİP (the Ministry of Labor’s online occupational health and safety system) no later than one day before the inspection. The installation design is kept at hand; the inspection also checks compliance with the design.
Employer + authorized personVisual inspection
Usually done with the facility de-energized, before measurements. Protective measures, conductor cross-sections, markings and connections are examined.
Authorized personMeasurements
Continuity of protective conductors, grounding resistance and fault loop impedance are measured. Tripping of the residual current device (RCD) and automatic disconnection of supply are tested. Insulation resistance is measured at the initial inspection, not at periodic inspections.
Authorized personReport
Measured values are compared with the limits. The result states clearly whether the installation can be used.
Authorized person → employer
Measuring instruments must have valid calibration. If a fault is found, the measurements it affects are repeated after it is fixed.
What should be prepared before the inspection?
The employer makes the preparations the authorized person requests. Most inspections need:
- An up-to-date design of the installation. If there is none, a design is drawn up first.
- Previous inspection reports. Reports are kept for as long as the installation is in use.
- Easy access to panels and grounding measurement points.
- A plan for a short power outage. Visual inspection is usually done with the facility de-energized.
If preparation is incomplete, measurements may be left unfinished and a second visit may be needed. Scheduling the outage at the quietest time of production or the workday makes things easier.
What does the report include?
Annex III lists the sections of the report one by one. Since September 1, 2025, the Ministry’s mandatory report format is used for indoor electrical installations, low-voltage grounding and lightning protection. In short:
- Workplace details, contract number, start and end time of the inspection, date of the next inspection.
- Inspection method: which standard or regulation.
- Measured values and test results.
- Measuring instruments used and their calibration details.
- Defects found.
- Result and opinion: fit for use, or not usable until the defect is fixed.
- Inspector’s name, profession, EKİPNET registration number and signature.
A report that is unsigned or issued without an İSG-KATİP contract is invalid. The employer keeps the reports with wet signatures or secure electronic signatures.
What does the report conclude?
In the Ministry’s format, each finding is marked as a minor defect (*) or a major defect (**). The result is a single verdict: the installation is fit for use or not fit for use.
- If there is a major defect, the facility must not be used until the defect is fixed. The employer marks this with a visible warning. Once the defect is fixed, a second inspection is done and a second report is issued.
- A minor defect must be fixed before the next inspection begins. If it is not fixed, it counts as a major defect.
Three examples of major defects:
- No grounding jumper between the panel body and its door.
- No 30 mA RCD on general-purpose outlets.
- Lightning protection grounding resistance of 10 ohms or more.
Frequently asked questions
Is periodic inspection mandatory for my home?
This regulation is for workplaces; it does not cover homes. Still, a measurement on an old installation or after a renovation reveals risks early.
Is this inspection mandatory for an apartment building?
Apartment buildings and housing complexes with at least one employee, such as a building attendant or cleaner, count as workplaces. In that case, the electrical and grounding installation of the common areas must be inspected once a year. An apartment building with no employees has no such obligation.
Who can perform the inspection?
An authorized person registered in EKİPNET. Article 2.3.2 of the regulation’s Annex III lists which professions are authorized.
What if I don’t have an installation design?
The inspection requires the installation design. If an installation has no design, the employer must have one made.
Can I use the installation if the report finds a defect?
Not if there is a major defect. The defect is fixed, and a new report is issued after a second inspection. With a minor defect, the installation can be used; the defect must be fixed by the next inspection.
Sources
- Regulation on Health and Safety Requirements for the Use of Work Equipment (İş Ekipmanlarının Kullanımında Sağlık ve Güvenlik Şartları Yönetmeliği), Official Gazette No. 28628, April 25, 2013
- Amendment to the Work Equipment Regulation (Annex III renewed), Official Gazette No. 33116, December 23, 2025
- Regulation on Grounding in Electrical Installations (Elektrik Tesislerinde Topraklamalar Yönetmeliği), Official Gazette No. 24500, August 21, 2001
- Occupational Health and Safety Law No. 6331, Official Gazette No. 28339, June 30, 2012
- ÇSGB (Ministry of Labor and Social Security) Directorate General of Occupational Health and Safety, mandatory periodic inspection criteria and report documents (ZPKK01–03, ZPKR01–03), effective September 1, 2025
