When Do You Actually Need an Electrical Inspection?
Not every situation needs a specialist, but some genuinely do — and no DIY check can replace a certified measurement report. Here's an honest list of when to call a professional, and when your own eyes are enough.
4 situations that call for an inspection
Commissioning a new installation
Before any new installation is connected, a full test sequence per IEC 60364-6 is required — from visual inspection through to the measurement protocol.
Buying or selling a property
An objective measurement report protects both buyer and seller — it shows the installation's real condition, not assumptions.
After a major renovation or extension
A new circuit, a new distribution board, or added load — any change to the installation is a reason to verify it still meets the standard.
Periodic checks or warning signs
Older installations need regular re-testing; if a breaker trips often, you smell burning near the panel, or outlets feel warm — don't wait.
What's actually being checked
The standard behind every measurement
LVS HD 60364-6 (the Latvian version of IEC 60364-6) sets the test sequence for both initial and periodic inspections of low-voltage installations.
Continuity
Checks that protective conductors and bonding are properly connected — the foundation without which the rest of the measurements mean nothing.
Insulation resistance
Measured with a megohmmeter at 250V, 500V or 1000V DC depending on the circuit's voltage class — the exact acceptable threshold depends on the circuit and standard.
Loop impedance (Zs)
Confirms the protective device can disconnect a faulty circuit fast enough — the acceptable value depends on the device and its rated current.
Earth electrode resistance
Shows how effectively the earthing system carries fault current away — measured with a dedicated earth tester.
Thermography
A thermal camera reveals hot spots in the panel or wiring — often an early sign of a loose connection before it becomes visible.
How an inspection works
The full sequence from visual check to protocol — RCD trip parameters are covered in detail on our dedicated RCD pages.
- Visual inspection with power off
- Continuity and insulation resistance measurements
- Earth and loop impedance (Zs) measurements
- Polarity check and functional test
- Measurement protocol/certificate with results
Frequently asked questions
Can I inspect my own electrical installation?
You can spot visual issues yourself — loose connections, burnt sockets, warm contacts. But the actual measurements and the protocol can only be issued by a certified electrician with a calibrated instrument.
How often do I need a periodic inspection?
The interval depends on the type of property, how intensively it's used, and insurer requirements — there's no single universal deadline for every installation.
What actually happens during an inspection?
It starts with a visual check, then continuity, insulation, earth, loop impedance and RCD measurements, finishing with a functional test and the protocol.
Why do I need a measurement report when buying or selling a property?
The report objectively records the installation's real condition — protecting both parties from disputes over hidden defects after the deal.
My breaker trips often or I smell something at the panel — what now?
That's a sign to book an inspection right away, not wait. Don't try to fix it yourself — call a specialist.
Not sure if your situation needs an inspection?
Tell us what's going on — we'll help you figure out whether a full inspection is needed, no sales pressure, just a straight answer.