What do we inspect?
Distribution boards, protective devices (MCBs/RCBOs/RCDs), cabling, earthing/bonding, documentation (schematics/circuit schedule) and alignment with actual use. We assess electrical safety (shock/fire) and functional performance.
The distribution board has to handle more and more
Many installations were originally designed for a normal home or small business. Over time, more loads are added: induction cooking, an EV charger, a heat pump, solar panels and sometimes a home battery. Each addition may make sense on its own, but together they put serious demand on the distribution board, main fuse, earthing and phase distribution.
- Is the load still balanced correctly across the phases?
- Are cooker, EV charger, heat pump, PV and battery circuits properly protected?
- Has simultaneous use and peak load been considered?
- Is selectivity between main fuse, RCD/RCBOs and final circuits still correct?
- Are circuits, cables, breakers, RCDs and labels still logical and demonstrably safe?
- Is documentation clear enough for owner, installer and insurer?
That is why inspection is not only useful for the customer. Insurers, landlords, property managers and businesses also benefit from a clear report. After damage, overheating, faults or expansion, you want to be able to show that the installation was inspected, measured and documented.
When to (re)inspect?
- Commissioning or modification of an installation (NEN 1010)
- Periodic in-service inspection (NEN 3140) — risk-based interval; often 1–5 years
- Change in use or load (e.g. EV charger, heat pump, PV)
- Handover/tenant change or insurer/OSH requirement
- After faults, thermal issues or consumer-unit upgrades
Our process
- Scope & preparation (drawings, previous reports, operations)
- Visual inspection (build, labelling, IP rating, penetrations, fire load)
- Measurements & tests (insulation, continuity, loop impedance, RCD test, etc.)
- Reporting with photos, readings and priorities (Pass/Fail)
- Remediation advice and quote (optional); re-inspection after fix
Measurements & tests
- Insulation resistance • PE continuity • Earth resistance
- Fault loop impedance / PSCC • Polarity • Phase sequence
- RCD/RCBO test (IΔn, trip time) • Voltage drop (where relevant)
- Functional tests of protections/emergency systems • SPD check and, if applied, AFDD
Deliverables
- PDF report with findings, photos and measurement records
- Defect list with priority (safety/continuity/regulatory)
- Concrete remediation plan • Re-inspection report after fixes
Quote checklist (useful information)
- Site type (residential, commercial, industrial) and address
- Number of distribution boards and main supply (1-/3-phase, fuse rating)
- Approx. number of final circuits and special circuits (EV, PV, cooker/Perilex, heat pump)
- Access windows / ability to isolate power
- Available documentation (schematics, previous reports, circuit schedule)
- Known issues/symptoms (RCD tripping, hotspots, etc.)