AS ISO 6469.3:2014 Electrically propelled road vehicles— Safety specifications
8.1 General
The tests to verify the protection measures according to Clause 7 shall in principle be performed on each voltage class B electric circuit on the vehicle, when the charge coupler is disconnected.
If the safety aspects in relation to the whole vehicle are not affected, the tests may be performed outside the vehicle on the components or parts of the voltage class B electric circuits individually instead.
8.2.2 Isolation resistance measurements of the balance of electric power systems
The test voltage shall be a d.c. voltage of at least the maximum working voltage of the voltage class B power system and be applied for a time long enough to obtain stable reading.
If the system has several voltage ranges (e.g. because of boost converter) in conductively connected circuit and some of the components cannot withstand the maximum working voltage of the entire circuit, the isolation resistances of components can be measured separately by applying their own maximum working voltages after those components are disconnected.
The following test procedure combines the measurement of the isolation resistance of the live parts of the voltage class B balance of electric power systems against the vehicle electric chassis and against the live parts of the voltage class A balance of auxiliary electric systems.
– Traction batteries shall be disconnected at their terminals from the power system.
– Electric power sources of the voltage class B power systems other than the traction batteries (fuel cell stacks, capacitors) may be disconnected at their terminals from the power system; if they remain connected, power generation shall be deactivated.
– Barriers and enclosures shall be included unless evaluations prove otherwise.
– All live parts of the balance of electric power systems (voltage class B) shall be connected to each other.
– All exposed conductive parts of the balance of electric power system shall be connected to the electric chassis.