Isolation resistance. If the electrical circuit divided by the disconnect function includes AC circuit, this part of the high voltage bus shall be considered as an AC high voltage bus. If the electrical circuit divided by the disconnect function doesn't include AC circuit, this part of the high voltage bus shall be considered as a DC high voltage bus. For AC high voltage buses, isolation resistance between the high voltage bus and the electrical chassis shall have minimum value of 500 ohms/volt of working voltage. If the protection degree IPXXB is satisfied for AC portion of the high voltage buses after crash, isolation resistance between the high voltage bus and the electrical chassis shall have minimum value of 100 ohms/volt of working voltage. For DC high voltage buses, isolation resistance between any high voltage bus and the electrical chassis shall have minimum value of 100 ohms/volt of working voltage.
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Sources: Regulation 95 Concerning the Approval of Vehicles Regarding the Protection of Occupants in the Event of a Lateral Collision, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles