UNECE R10 and ISO 26262: What a Charger Supplier Must Be Able to Hand You

Two standards dominate every conversation about automotive-grade power electronics: UNECE R10 for electromagnetic compatibility and ISO 26262 for functional safety. Neither is a certificate you hang on the wall — they are evidence chains, and the supplier either has the documents or does not. The fastest way to lose three months on a vehicle programme is to discover at the type approval stage that the charger supplier has functional-safety claims but no functional-safety file.

UNECE R10: what the charger actually provides

R10 is a type-approval regulation: the vehicle receives the approval, and the charger is tested as an electrical/electronic subassembly (ESA). In practice the charger supplier delivers:

Test reports for conducted and radiated emissions and for immunity, run to the applicable R10 revision and to a test plan agreed with the vehicle manufacturer; a description of the ESA’s operating modes used during the test; and the installation guidance that keeps the tested configuration valid — cable routing, grounding, shielding and the filter components that must not be removed.

That last item is the one that gets ignored. A charger that passed emissions testing with a specific shielded harness can fail vehicle-level testing when the harness changes. The supplier’s report is only valid for the configuration it describes.

Document	Standard	What it proves	Typical owner
EMC test report	UNECE R10 (ESA)	Emissions and immunity at component level	Charger supplier, with an accredited lab
Installation / grounding note	R10 support package	The tested configuration is reproducible in the vehicle	Charger supplier
Safety manual	ISO 26262-5/6	Assumptions, constraints of use, diagnostics coverage	Charger supplier
SEooC argument / FMEDA	ISO 26262	Failure modes, DC on safety goals at the declared ASIL	Charger supplier
DFMEA	IATF 16949 / AIAG-VDA	Design risk analysis and its closure	Charger supplier
PPAP package	IATF 16949	Process capability at the production line	Charger supplier
Vehicle type approval	UNECE R10	The finished vehicle may be sold	Vehicle manufacturer

ISO 26262: the SEooC concept in one paragraph

A charger is normally developed as a Safety Element out of Context. The supplier does not know your vehicle’s safety goals, so it declares assumptions — the ASIL it is designed to support, the functions it performs, the fault tolerant time interval it assumes, and the diagnostics it exposes over CAN. Those assumptions are the contract. If your vehicle needs an ASIL B charge-enable path and the charger was developed as QM with a declared ASIL B capability only for over-temperature protection, the gap is yours to close, usually with an external monitor.

“Designed to” versus “certified to”

These phrases are not interchangeable and the distinction protects both sides. Certified to means an accredited body has issued evidence for this product. Designed to means the development process and the design rules followed the standard, and the documentation exists to show it, but no certificate has been issued for the specific part number.

A supplier that blurs the two is either careless or hoping you will not ask. Grapcharger states the position on each model page rather than in a footnote, because a distributor quoting a European fleet needs to know which sentence applies before they promise anything to their customer.

The RFQ document list

Put these in the request and require an answer per line: EMC test report and the configuration it covers; the R10 revision; safety manual and declared ASIL per safety goal; FMEDA summary with diagnostic coverage; DFMEA and its review status; the manufacturing site and its IATF certificate; PPAP level offered; and the change-notification process for the part. Eight lines. A serious supplier answers in days.

For the process side — how a programme runs from concept to start of production — see Engineering Process. The functional safety page covers the charger-side architecture, and EMC and UNECE R10 covers the test setup.

Frequently asked

Does an on-board charger need its own R10 approval?

No. R10 approves the vehicle. The charger is tested as a subassembly and the vehicle manufacturer uses those results in its own approval. What the charger supplier owes you is a valid, configuration-specific test report.

Can a QM charger be used in an ASIL B vehicle?

Yes, if the vehicle architecture provides the safety mechanism externally — typically an independent monitor that removes charge enable. The charger must still document its failure modes so the external monitor can be designed.

Is IATF 16949 the same as ISO 26262?

No. IATF 16949 is a quality management system for automotive production. ISO 26262 is a functional safety standard for the product. A supplier can hold one without the other.