Test-interval calculator (DGUV Regulation 3)
Under DGUV Regulation 3, test intervals differ between fixed (permanently installed) and portable (mobile) electrical equipment: fixed installations usually have a 4-year interval, while portable devices have guideline intervals of 6 months to 2 years. Choose your device from the list and enter the last test, and the calculator gives you the guideline interval and the next test date.
Please choose a device and enter the date of the last inspection.
Under DGUV Regulation 3, electrical equipment must be inspected regularly by a qualified electrician. The specific intervals follow from the risk assessment; the values stored here are common guideline figures (office devices usually 24 months, more heavily used ones 12 months, fixed installations up to 48 months). The base guideline for portable devices is shorter and can be extended if the fault rate is low. Guidance, not legal advice.
How the calculation works
Under DGUV Regulation 3, electrical equipment must be inspected regularly by a qualified electrician. The regulation sets no fixed interval: the specific intervals follow from your risk assessment. The calculator uses the common guideline values.
portable office equipment: usually 24 months
equipment under heavier use: 12 months
fixed installations: up to 48 months
The baseline for portable equipment is shorter and may be extended if the failure rate found during inspections stays low. That is the usual route in an office: inspect at short intervals first, then stretch them once results are clean.
Two examples
- Laptop at a fixed desk: low mechanical stress, guideline 24 months.
- Extension lead in storage or a kettle in the kitchen: heavier use, guideline 12 months.
What the interval does not cover
- Visual checks by employees. Damaged cables and power supplies must be taken out of service immediately, regardless of the next due date. This belongs in safety training.
- Inspection after repair or modification. Due regardless of the cycle.
- Fixed installations. Wiring, distribution boards and permanently connected equipment follow their own intervals and usually sit with building management.
Who is responsible and what else attaches to fire safety is covered in Fire safety in the office.
Frequently asked questions
Who may carry out the inspection?
Does the duty cover private devices used in the office?
What happens if an interval is exceeded?
Do devices used at home have to be inspected?
Talk to us.
Book a slot directly, or write to us using the form.