BS ISO 06469-3:2011 pdf download

BS ISO 06469-3:2011 pdf download.Electrically propelled roadvehicles-Safety specifications Part 3: Protection of persons against electricshock.
3.14
electrically propelled vehicle
vehicle with one or more electric drive(s) (3.15) for vehicle propulsion
3.15
electric dnve
combination of traction motor, power electronics and their associated controls for the conversion of electric 10 mechanical power and vice versa
3.16
enclosure
part providing protection of equipment against direct contact (3.10) from any direction
3.17
exposed conductive part
conductive pan (3.8) of the electric equipment that can be touched by a test finger according to IPXXB (see ISO 20653) after removing barriers/enclosures that can be removed without using tools and that is not normally live, but which can become live under fault conditions
3.18
fuel cell stack
assembly of two or more fuel cells that are electrically connected
3.19
fuel cell system
system, typically containing the following subsystems: fuel cell stack (3.18). air processing, fuel processing, thermal management water management. and their control
3.20
isolation resistance
resistance between live parts of voltage class B (3,31) electric Orcuit and the electric chassis (3.12) as weN as the voltage class A (3.30) system
3.21
isolation resistance monitoring system
system that periodically or continuously monitors the isolation resistance (3.20) between live parts (3.22)
and the electric chassis (3.12)
3.22
live part
conductor or conductive part (3.8) intended to be electrically energized in normal use
3.23
maximum working voltage
highest value of ac. voltage (rms) or of d.c. voltage that can ocwr in an electric system under any normal operating conditions according to the manufactiser’s specifications, disregarding transients
3.24
potential equalization
electric connections of exposed conductive parts (3.8) of the electric equipment to minimize differences in potential between these parts
3.25
protection degree
protection provided by a barrier (3.3)/enclosure (3.16) related to the contact with live parts (3.22) by a test probe, such as a test finger (IPXXB), a test rod (IPXXC), or a test wire (IPXXD) in accordance with ISO 20653
7.3 Protection under single-failure conditions
7.3,1 Potential equalization
As a general rule, exposed conductive parts of voltage class B electric equipment, including exposed conductive barners/enclosures, shall be bonded to the electric chassis for potential equalization in accordance with the requirements in 7.9.
7.3.2 Isolation resistance
The voltage class B electric circuits intended to be not conctuctively connected to the grid shaM have sufficient isolation resistance In accordance with the requirements in 7.7.
If the minimum isolation resistance requirement of such circuits cannot be maintained under all operational oonditions and over the entire service life, one of the following measures shall be applied:
monitonng of the isolation resistance penodically or continuously: an appropriate warning shall be provided if loss of Isolation resistance Is detected, the voltage class B system may be deactivated depending on the operational state of the vehicle or the ability to activate the voltage class B system may
be 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 ctrcuits intended to be conductively connected to the grid are given in 7.102.
NOTE I Isolation resistances below the required mnmum values can occw due to deterioration of fuel cell (PC) systems’ cooling liquids or of certain battery types.
NOTE 2 Coordination between multiple isolation monitoring systems can be necessary, e.g. during charging.
NOTE 3 The isolation resistance is approximately zero for a voltage class B electric circuit conductively connected to the gnd,
NOTE 4 Additional layer(s) of Wisaiation and double or reinforced irwijabon include, but are not limited to. those for vo#age class B wring.
NOTE 5 The rigid barriers/enclosures include, but are not limited to. power control enclosaes, motor housings. comector casings and housings. etc. They can be used as single measure instead of basic barriers/enclosures to meet both basic and singteJailwe protection reqiarements.
7.3.3 Capacitive couplings
7.3.3,1 CapacItive couplings between a voltage class B potential and electric chassis usually result front V 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:
energy of the total capacitance between any energized voltage class B live part and the electric chassis shall be 0.2 J at its maximum working voltage; total capacitance should be calculated based on designed values of related parts and components.
alternative mechanical or electrical measures for d.c. voltage class B electric circuits; see 7.3.3.4.