I'm running into an issue with electrical safety testing on a class 1 ME externally powered device. The device can operate both via a removable battery pack, or an external power adapter. The device is labeled as Class 1, however there are no exposed protective earth conductors on the chassis. All metal components are only functional earths, with resistance above 0.2 Ohms. The protective earth, is located inside the external power adapter, which of course is not accessible during safety testing. Is earth resistance testing required for this device? If so, how can earth resistance be measured if there are no accessible protective earth points in the chassis?