Technical Articles
IEC62368-1(3.0) vs (2.0)changes summary
• Requirements become more stringent
• Requirements become easier to comply
• Corrections
Note:
This summary does not include all the differences between IEC62368-1 edition 3.0 and 2.0. It only lists out the changes which the manufacturers may be more
interested of.
• Glass Impact test
• Glass Fixation test
• Insulating Liquid
• Coin battery
• ES1 single fault condition
• Varistors in L/N
• Varistors in Fire Enclosure
• Functional Earthing
• Internal wires to Outlets
• Horizontal Force test
• Wireless Charger
• Lasers > Class 1
• LED/Lamp Radiations
• PCB traces as fault protection
• Secondary Lithium Battery Fire Enclosure
• Wearable products touch temp limit
Glass Impact test
Applied Situation:
Glass acts as a safeguard that is accessible and that acts as a fire enclosure only, and either its surface area > 0.1m2 or its major dimension > 450mm
IEC62368-1(2.0) – 4.4.4.6:
No Glass Impact test
IEC62368-1(3.0) – 4.4.3.6:
Shall pass Glass Impact test of T.9
Glass Fixation test
Applied Situation:
Laminated glass used as a safeguard that prevents access to class 3 energy sources other than PS3
IEC62368-1(2.0) – N/A:
Has no such requirement
IEC62368-1(3.0) – 4.4.3.7:
Shall pass Glass fixation test: 3 times impact with 204mm
height and 10N push/pull on the center
Insulating liquid
Applied Situation:
If an insulating liquid displaces air comprising a safeguard
IEC62368-1(2.0) – N/A:
Has no such requirement
IEC62368-1(3.0) – 4.4.4, 5.4.12, 6.4.9, B.3.1, F.4:
Shall meet the related requirements of the clauses above
Coin Battery
Applied Situation:
Products employing coin battery
IEC62368-1(2.0) IEC62368-1(3.0)
4.8 Scope Lithium coin battery All coin battery
4.8.3 tool to
open the
compartment
No specific definition of
the tool
minimum torque of 0,5
Nm and a minimum
angle of 90 degrees of
rotation
4.8.5
compliance
check
V.2 adult test finger V.1 children test finger
ES1 single fault condition
Applied Situation:
ES1 measurement
IEC62368-1(2.0) – 5.2.1.1:
Single fault only includes Basic Safeguard
IEC62368-1(3.0) – 5.2.1.1:
Single fault includes both Basic and Supplementary Safeguard
Varistors in L/N
Applied Situation:
Varistors between Line and Neutral or Lines
IEC62368-1(2.0) – 5.5.7:
No special requirements
IEC62368-1(3.0) – 5.5.7:
These varistors shall comply with annex G.8 applicable clauses
Varistors in Fire Enclosure
Applied Situation:
Varistors distance to combustible Fire Enclosure <13mm
IEC62368-1(2.0) – G.8.3:
No such requirements
IEC62368-1(3.0) – G.8.2:
These varistors shall comply with annex G.8.2
Functional Earthing
Applied Situation:
Protective earthing conductor in the mains supply cord is only
used for establishing functional earthing
IEC62368-1(2.0) – N/A:
No such requirement
IEC62368-1(3.0) – 5.6.8:
Shall also meet conductor size in G.7.2
Internal wires to Outlets
Applied Situation:
Internal wires to socket outlets which supply power to other
apparatus
IEC62368-1(2.0) – N/A:
No such requirement
IEC62368-1(3.0) – 6.5.3:
Shall also meet conductor size in G.7.2
Horizontal Force test
Applied Situation:
Horizontal Force test method one
IEC62368-1(2.0) – 8.6.5:
13% of product weight or 100N whichever is less
IEC62368-1(3.0) – 6.5.3:
20% of product weight or 250N whichever is less
Wireless Charger
Applied Situation:
Wireless Charger
IEC62368-1(2.0) – N/A:
No such requirements
IEC62368-1(3.0) – 9.6:
Shall pass the tests of 9.6 to prevent overheat of foreign
metallic objects
Lasers > class 1
Applied Situation:
Laser products with radiation > class 1
IEC62368-1(2.0) – 10.3:
Is there any laser class is not allowed?
No
IEC62368-1(3.0) – 10.3:
Is there any laser class is not allowed?
For Ordinary and Instructed Person, Class 3B and Class 4 are not
allowed. Besides, need to consider followings when applying
IEC60825-1:
– the robustness of a safeguard (see 4.4.3);
– operating conditions (see Annex B); and
– safety interlocks (see Annex K).
LED/Lamp Radiations
Applied Situation:
Limits for Radiation not needed to be accessible for the correct
functioning of the equipment
IEC62368-1(2.0) – 10.4:
RG1
IEC62368-1(3.0) – 10.4:
Exempt group or RG1 depends on different type of the
radiation, find details in Table 40
PCB traces as fault protection
Applied Situation:
the opening of a conductor on a printed board is used as a safeguard
for B.4 tests
IEC62368-1(2.0) – 6.4.3.2:
Only mention this protection method in 6.4.3.2 for Fire Protection
without same details as described in IEC62368-1(3.0) B.4.8 . No
mention if PCB trace can be used as B.4 safeguard.
IEC62368-1(3.0) – B.4.8:
the opening of a conductor on a printed board is allowed be used as a
safeguard for B.4 tests, provided following conditions are met:
1) Repeat total 3 times,
2) Conductors of a printed board of V-1 class material or VTM-1 class material
may open under overload condition provided that the open circuit is not an
arcing PIS. Conductors on a printed board material that has no material
flammability class or is classed lower than V-1 class material shall not open.
3) Under a single fault condition, the peeling of conductors on a printed board
shall not result in the failure of any supplementary safeguard or reinforced
safeguard.
Secondary Lithium Battery Fire Enclosure
Applied Situation:
Under what condition the Fire Enclosure is not required for
secondary lithium battery
IEC62368-1(2.0) – M.4.3:
Battery’s output is PS1
IEC62368-1(3.0) – M.4.3:
Battery cell’s output is PS1
Wearable devices touch temp limit
Applied Situation:
Wearable lightweight devices such as watches, headsets,
personal music players and sports monitoring equipment
IEC62368-1(2.0) – Table 38:
Touch limit is 48Deg.C no matter how long it touches human
body.
IEC62368-1(3.0) – Table 38:
A new row is added specially for this kind of devices.
Limits vary from 48Deg.C to 43Deg.C.
Linear calculation, and round down to the nearest whole
number:
• 48Deg.C for touch time 1 minute
• 43Deg.C for touch time >=8 hours
• For example, if touch time is 3 hours then limit is 46Deg.C
• Bleeding Resistor for Capacitance Discharge
• Single Screw/Stud for PE and PB
• Flammability requirements
• Forced air flow
• Fire enclosure Side openings
• Glass Slide test
• MS2 Products with controls or display
• Marking on Mounting products
• Equipment with multiple supply connections
• DC Power output marking
• Full Insulated Winding wire (FIW)
• Y2 capacitor to bridge insulation
• TS safeguards
Bleeding Resistor for Capacitance Discharge
Applied Situation:
Under what conditions the Bleeding Resistor can be waived of
the single fault when conducting Capacitance Discharge test?
IEC62368-1(2.0) – 5.5.2.2, 5.5.6:
There is no such conditions defined.
IEC62368-1(3.0) – 5.5.2.2, 5.5.6:
Bleeding Resistor complying G.10.2 conditioning and G.10.6
overload test can waive the single fault
Bleeding resistor
no fault
Bleeding resistor
fault
Single Screw/Stud for PE and PB
Applied Situation:
Under what conditions a single Screw/Stud may be used to
secure both Protective Earthing conductor and Protective
Bonding conductor?
IEC62368-1(2.0) – 5.6.2.1:
There is no such conditions defined.
IEC62368-1(3.0) – 5.6.2.1:
The protective earthing conductor shall be separated by a nut
from that of the protective bonding conductor. The protective
earthing conductor shall be on the bottom of the stack, so that
it is the last connection disturbed.
Flammability requirements
Comparing with edition 2.0, edition 3.0 give more
alternatives to meet flammability requirements:
1) Small parts which can be exempt: <4g, or <1750mm3
2) 550Deg.C Glow Wire test as alternative for HB
3) UL2556 VW-1 as alternative for wire insulation flammability
4) 6.4.6 V-1 adds alternative to meet annex S.1
Forced airflow
Applied Situation:
For requirements of separation from PIS and Fire enclosure
openings
IEC62368-1(2.0) – 6.4.7, 6.4.8:
There is special requirements to consider the forced airflow
IEC62368-1(3.0) – 5.6.2.1:
such requirements are deleted
Fire enclosure Side openings
Applied Situation:
For a Fire enclosure, under what conditions shall the side
openings also meet Top or Bottom openings requirement?
IEC62368-1(2.0) – Figure 41, Figure 42:
Any side openings within the volume shown in Figure 41 or 42
IEC62368-1(3.0) – Figure 40, Figure 41, Figure 42:
Side openings that meet Figure 40 definition and within the
volume shown in Figure 41 or 42
Glass Slide test
Applied Situation:
Products may be used in areas where children present, and
with front mounted accessible user controls or having displays
with moving images
IEC62368-1(2.0) – Table 36:
Both Floor standing and Non Floor standing products are
required for this Glass Slide test
IEC62368-1(3.0) – Table 36:
Only Non Floor standing products are required
Glass Surface
MS2 Products with controls or display
Applied Situation:
MS2 Products may be used in areas where children present,
and with front mounted accessible user controls or having
displays with moving images
IEC62368-1(2.0) – Table 36:
Horizontal force test is required
IEC62368-1(3.0) – Table 36:
Horizontal force test is not required, instead Static stability test
is required and which is less stringent than Horizontal force
test
Marking on Mounting products
Applied Situation:
Equipment intended to be mounted on a supporting structure
(for example, a rack, panel, wall, ceiling, etc.) and where the
external surface of the equipment becomes partially invisible
after installation, markings may be on any surface that
becomes visible after removal
IEC62368-1(2.0) – F.3.1:
Only eligible for mounting products > 18kg
IEC62368-1(3.0) – Table 36:
Eligible for all mounting products
Equipment with multiple supply connections
Applied Situation:
For equipment with multiple supply connections and the
multiple mains supplies are identical, is it OK to mark the rated
input Voltage and Current/Power on one supply connection?
IEC62368-1(2.0) – F.3.3.7:
No
IEC62368-1(3.0) – F.3.3.7:
Where the multiple mains supplies are identical, they may
have one marking indicating the number of supplies.
EXAMPLE “240 V / 10 A × N” where N is the number of
identical mains supply connections.
DC power output marking
Applied Situation:
Shall the polarity of DC power output always be marked?
IEC62368-1(2.0) – F.3.8:
Yes
IEC62368-1(3.0) – F.3.8:
No, Polarity marking is not required when the pin configuration
prevents reversed polarity.
Full Insulated Winding wire (FIW)
Applied Situation:
Under what conditions could the Full Insulated Winding wire
(FIW, also called zero-defect enamelled wire) be treated to
have basic or reinforced insulation?
IEC62368-1(2.0) – N/A:
No such conditions are defined
IEC62368-1(3.0) – G.5.3.4, G.6.1, G.6.2:
G.5.3.4, G.6.1 and G.6.2 specify the requirements details
Y2 capacitor to bridge insulation
Applied Situation:
Number of Y2 capacitor bridging the basic insulation for
2500Vpk/dc Electric Strength test voltage
IEC62368-1(2.0) – Table G.9:
Need 2 Y2 capacitors
IEC62368-1(3.0) – Table G.12 rule 1:
1 Y2 capacitor is OK
TS3 safeguards
Applied Situation:
TS3 parts that requires heat for the intended function
IEC62368-1(2.0) IEC62368-1(3.0)
Safeguards to
Ordinary or
Instructed Person
Equipment
safeguard
+ Instructional
safeguard
Equipment safeguard, or
Instructional safeguard provided that:
1) No need to touch this part for operation,
and
2) Unlikely to intentionally touch, and
3) Maintenance need not involve this part,
and
4) Not used in Children place (instruction
requirements per F.4)
Safeguards to
Skilled Person
Equipment safeguard or Instructional safeguard
Corrections
• 4.9: delete “PS2” to ally with annex P
• 6.4.8.3.4: Fire enclosure bottom openings option, delete c) and d) which
are covered by a)
• F.3.3.6: the rated power is total power of 3 phases, but not one phase
• G.5.3&G.5.4: for tests using wrapping tissue, add test results checking
point of wrapping tissue also
• G.7.6.1: correct wrong “Table G.4” to “Table G.9”
• M.4.3: delete 2 nd bullet content which conflicts with the purpose of
M.4.3
• Annex P.5 is corrected to P.4.2
• T.7: drop test heights for bullets 3 and 4 are corrected
• 6.4.8.3.3/S.2: Fire enclosure top openings test, test location of fire is
corrected
Nina She