This part of ISO 19453 specifies requirements for the electric propulsion systems and components with maximum working voltages according to voltage class B. It does not apply to high voltage battery packs (e.g. for traction) and systems and components inside. It describes the potential environmental stresses and specifies tests and requirements recommended for different stress levels on/in the vehicle. This part of ISO 19453 describes chemical loads. NOTE – Conditions and testing for a continuous contact can be determined from other standards or agreed upon between customer and supplier.