IEC 60364-6 Verification Test Sequence for Panel Builders
A neutral engineering reference to the full IEC 60364-6 (LVS HD 60364-6) verification sequence — from visual inspection to the final protocol — for integrators and panel builders working across different national annexes.
The verification sequence, step by step
Visual inspection
Dead-installation check of protective conductors, labelling, enclosure rating and equipment selection before any measurement starts.
Continuity & insulation resistance
Confirm protective-conductor and bonding continuity, then measure insulation resistance at 250, 500 or 1000V DC depending on the circuit's voltage class.
Earth, polarity & loop impedance
Check earth-electrode resistance, verify polarity and phase sequence, then measure the phase-to-earth loop impedance (Zs) and prospective fault current.
RCD, functional test & protocol
Verify RCD trip time and current, run a functional test of switching devices, and record every result in the measurement protocol.
What the sequence covers
DC test voltages
Insulation resistance is measured at 250, 500 or 1000V DC depending on the circuit's nominal voltage class — SELV/PELV circuits use a lower test voltage than standard 230/400V circuits.
Protective conductor & bonding continuity
Confirms every exposed metal enclosure and extraneous conductive part is bonded to the protective earth system through a low-resistance path — the basis every later measurement depends on.
Insulation resistance by voltage class
Measured with a megohmmeter at 250, 500 or 1000V DC. A practical minimum of ≥1 MΩ is commonly cited, but the accepted threshold for a given circuit depends on the applicable standard and is read from the protocol.
SELV/PELV and electrical separation
Where a circuit relies on extra-low voltage or separation for protection, this is checked and documented alongside the standard insulation test.
Earth-electrode resistance
Measured with a dedicated earth tester (three- or four-electrode method); the accepted value depends on the earthing system (TN, TT) and the protective scheme in use.
Loop impedance (Zs) & prospective fault current
Confirms the protective device — fuse or breaker — will disconnect a faulted circuit fast enough. The maximum acceptable Zs is calculated per device (U0/Ia), not one fixed number for every circuit.
How we support the test sequence
Documentation and engineering input for handover packs across different national annexes.
- Test sequence reference mapped to IEC 60364-6 / LVS HD 60364-6
- Panel and circuit documentation review before handover
- Guidance on national-annex differences across EU markets
- Coordination with your test engineer on protocol structure
- Cross-links to our RCD/RCBO and panel assembly reference pages
Frequently asked questions
What is the difference between initial verification and periodic inspection under IEC 60364-6?
Initial verification is carried out on a new installation before it is put into service and covers the full sequence. Periodic inspection repeats the relevant parts on an existing installation at intervals set by the installation type, usage and applicable standard or insurer requirement — there is no single universal interval for every site.
Why doesn't this page give exact pass/fail thresholds for Zs or insulation resistance?
Because there isn't one number that applies everywhere. Maximum Zs depends on the protective device's rating and characteristic (U0/Ia calculation); insulation-resistance acceptance depends on the circuit's voltage class and the applicable national annex. The measurement protocol for your specific installation states the value that applies.
Which test voltage should be used for insulation resistance — 250V, 500V or 1000V DC?
It depends on the circuit's nominal voltage class. Lower-voltage circuits such as SELV/PELV are tested at a lower DC voltage than standard 230/400V circuits. A practical minimum of ≥1 MΩ is commonly cited, but always confirm the exact requirement against the applicable standard.
Does this sequence include RCD trip-time testing?
Yes, RCD trip-time and trip-current testing is part of the full verification sequence, but we don't cover RCD specifics in depth on this page — see our dedicated RCD/RCBO testing and RCD vs RCBO reference pages for that detail.
What instruments are used to run this test sequence?
A multifunction installation tester covers insulation resistance, continuity, loop impedance and RCD parameters; thermographic inspection uses a separate thermal camera. We don't recommend specific models here — instrument choice depends on your test scope and calibration requirements.
Need a second set of eyes on your test documentation?
Our engineers review panel and installation handover packs against IEC 60364-6 / LVS HD 60364-6 structure across EU jurisdictions — get in touch before you finalise the protocol.