AS ISO 6469.3:2014 pdf – Electrically propelled road vehicles—Safety specifications Part 3: Protection of persons against electric shock

AS ISO 6469.3:2014 pdf – Electrically propelled road vehicles—Safety specifications Part 3: Protection of persons against electric shock.
3.26
rechargeable energy storage system
RESS
system that stores energy for delivery of electric energy and that is rechargeable
EXAMPLES Battenes, capacitors.
3.27
reinforced insulation
insulation of live parts (3.22) for protection against electric shock (3.13) equivalent to double insulation (3.11)
NOTE Reinforced insulation does not imply that the insulation shall be a homogeneous piece. The reinforced insulation may be composed of several layers that cannot be tested individually as supplementary or basic insulation.
3.28
supplementary Insulation
independent insulation applied in addition to basic insulation (3.4) for protection against electric shock (3.13) in the event of a failure of the basic insulation (3.4)
3.29
traction battery
collection of all battery packs (3.6) that are electrically connected, for the supply of electric power to the electric drive (3.15) and to the conductively connected auxiliary electric system, if any
3.30
voltage class A
classification of an electric component or circuit with a maximum working voltage of less than 30 V a.c. (rms)
or 60 V d.c.
NOTE For moe details see Clause 5.
3.31
voltage class B
classification of an electric component or Circuit with a maximum wortcing voltage between 30 V a.c. (rms) and
1 000 V a.c. (rms) or between 60 V d.c. and 1 500 V d.c.
4 Environmental and operational conditions
The requirements given in this part of ISO 6469 shall be met across the range of environmental and operational conditions for which the electrically propelled vehicle is designed to operate, as specified by the vehicle manufacturer.
NOTE See ISO 16750 for guidance.
5 Voltage classes
Depending on its maximum working voltage, U, an electric component or circuit belongs to one of the voltage classes specified in Table 1.
7.3.2 lsolation resistance
The voltage class B electric circuits intended to be not conductively connected to the grid shall have sufficientisolation resistance in accordance with the requirements in 7.7.
lf the minimum isolation resistance requirement of such circuits cannot be maintained under all operationalconditions and over the entire service life, one of the following measures shall be applied:
monitoring of the isolation resistance periodically or continuously; an appropriate warning shall beprovided if loss of isolation resistance is detected;the voltage class B system may be deactivateddepending on the operational state of the vehicle or the ability to activate the voltage class B system maybe limited;
double or reinforced insulation instead of basic insulation;
one or more layers of insulation, barriers and/or enclosures in addition to the basic protection;
– rigid barriers/enclosures with sufficient mechanical robustness and durability , over the vehicle service life.Requirements on isolation resistance for voltage class B electric circuits intended to be conductivelyconnected to the grid are given in 7.10.2.
NOTE1 lsolation resistances below the required minimum values can occur due to deterioration of fuel cell(FC)systems’ cooling liquids or of certain battery types.
NOTE 2 Coordination between multiple isolation monitoring systems can be necessary, e.g. during charging.
NOTE3 The isolation resistance is approximately zero for a voltage class B electric circuit conductively connected tothe grid.
NOTE4 Additional layer(s) of insulation and double or reinforced insulation include, but are not limited to, those forvoltage class B wiring.
NOTE5 The rigid barriers/enclosures include,but are not limited to, power control enclosures，motor housings,connector casings and housings, etc. They can be used as single measure instead of basic barriers/enclosures to meetboth basic and single-failure protection requirements.
7.3.3 Capacitive couplings
7.3.3.1 Capacitive couplings between a voltage class B potential and electric chassis usually result fromY capacitors, used for electromagnetic compatibility (EMC) reasons, or parasitic capacitive couplings.
7.3.3.2 For d.c. body currents caused by discharge of such capacitive couplings when touching d.c.class B voltage, one of the following options shall be fulfilled.