Define what is being claimed
‘Cool touch’ can refer to a handle, door system or broader accessible surfaces. Without a defined area, mode, duration and ambient condition, the phrase is not testable. Glass, metal trim, controls, side walls and top surfaces can have different limits and user-contact assumptions under the applicable safety standard.
Measure under relevant worst cases
Identify the operating mode and setpoint that create the highest accessible temperatures. Include steady operation, realistic loading and surfaces near vents. Use the contact method and probes required by the applicable standard; thermal imaging is valuable for finding hot spots but does not automatically replace the normative measurement method.
Look beyond one golden sample
Insulation position, air gaps, door assembly, fan performance, seal compression and component tolerances affect temperature rise. Review more than one production-representative unit and inspect the assembly after transport or repeated door cycling.
Standards context
IEC 60335-2-9 addresses portable cooking appliances, while IEC 60335-2-6 addresses stationary household ovens. The 2024 stationary-oven edition notes alignment of external accessible-surface temperature-rise limits. The certification body should confirm the correct requirements for the exact product.
- IEC 60335-2-9: https://webstore.iec.ch/en/publication/61318
- IEC 60335-2-6: https://webstore.iec.ch/en/publication/65424