This List of Decisions is the outcome of the CENELEC Operational Staff Meeting for Electronic Equipment (OSM/EE). The decisions are designed to assist with common application of the Standard and not to change the meaning of the standard, which remains the definitive document
This list contains also items related to EN 60950-1 where specified under "comments". If other decisions can also be used for EN 60950-1 has to be verified.
Clause Decision Comments Dec.
No. Ref. Doc. Item
of
Doc.
Testing of an LCD TV with external power supply unit. The set needs to be certified according to IEC 60065 ed 6. The external power supply is already certified according to IEC 60950 another certification body
The LCD TV may be used as a monitor as well.
The intention of the manufacturer is to put the LCD screen/monitor and the power supply together on the market.
Case 1: LCD multimedia screen with a built in PSU (pre-certified),.
The whole apparatus has to be tested to one standard either EN 60950 or EN 60065 together with IEC Guide 112 as the product is a multimedia equipment (having an antenna and a telecommunication connection). Is a part of the apparatus already certified ( for example, PSU) this part has to be reassessed to the standard used for the whole apparatus either EN 60065 or EN 60950.
If there is sufficient detail available of the test results for the existing certification, it might not be necessary to carry out full testing to the second standard..
Case 2: Multimedia screen with separate PSU (pre-certified): a) If the manufacturer intends to sell the combination (Screen plus PSU) together, the PSU has to be listed in the Test Report and both items of apparatus have to be assessed according the same Standard.
b) If the manufacturer does not intend to sell the screen together with a specific PSU, it has to be mentioned in the test report what kind of PSU was used during the tests and the limits for voltage and current have to be specified. 02/5
EE(Chm)
3/02
7.1
CCA certificate can be issued for separate power supply units for office machines and information technology equipment which are tested according to Publication EN 60950. Sweden: The kind
of information
supplied with the
unit shall include a
statement that the
unit is intended for
office
machines/equipm
ent only.
Germany: The
above information
has to be in the
Users Manual.
95/6 EA(FI)
3/91 4.14Products similar to previously certified products shall be covered by an Addendum to the base report.
The CCA format shall be used where possible. The CCA cover page should always be used. Addendum reports
should be derived
from a base
report, not an
already derived
report.
EA(GB)3
/93 5.1
The primary testing laboratory may check National deviations in the case of the CCA.
In the case of the CB scheme, the CB Bulletin provides the individual requirements of each Certification Body. EA(GB)3
/93 6.27
Plug with integrated Power Supply
The equipment has to have a complete marking as for a power supply.
If the marking is on a part of the enclosure which is gripped while pulling/inserting the device from/into a wall socket outlet, additional requirements for the durability of the marking are necessary.
For the time being the meeting decided to use the marking requirements of EN 50144-1 "Safety of hand-held electric motor operated appliances".
Safety instructions shall state clearly that a replacement with a normal plug will be hazardous. 97/2 EE(Chm)
5/97
7.5
Where equipment tested to the current version of the standard incorporates a subassembly (e.g. a power supply unit ) certified to an earlier version of the standard (which is still valid for production ), the equipment test report shall clearly identify the version against which the subassembly was initially assessed. In determining any additional tests, consideration shall be given to the application, such as location and orientation. Also applicable changes in the standard shall be taken into consideration 97/9
EE(Chm)
5/97
7.1
1. 2. 4.3 If the safety strategy of an equipment containing SELV and
TNV circuits relies on Protective Earthing this equipment is
considered to be Class I and not Class III. 97/4
EE(Chm)
5/97
9.1
1. 5 RFI filters having components meeting IEC 60384-14 are
accepted. EA(GB)3
/93
6.7
1. 5. 1 A resistors which is connected across the mains or between
the mains and the safety earth do not need to comply with
EN 60 065. If the resistor is accepted according to EN 60
065, it need not be short-circuited during fault condition tests
in § 5.4.
This decision (96/14) does not apply to resistors bridging
double or reinforced insulation. See 1.5.7.2 96/14
00/7
EA(FI)
1/91
EE(Chm)5
/96
4.4
10.11. 5. 1 Capacitors which are connected after a rectifier in a primary
circuit of a switch mode power supply unit need not be se-
parately approved.
"In a primary circuit before a rectifier there is installation
category III for Permanently Connected equipment, therefore
class X1 capacitors must be used.
In a primary circuit before a rectifier there is installation
category II for Pluggable equipment Type A and Pluggable
equipment Type B, therefore minimum class X2 capacitors
must be used. The use of a mains fuse, a mains filter or a varistor cannot be a method to reduce installation category." Secondary circuits are normally in installation category I when the primary is in installation category II. However, a floating secondary shall be subject to the requirements for primary circuit in table III unless separated from primary circuits by an earthed metal screen. Changed acc.
discussion by mail
See also 2.10.3.4
EA(FI)
1/91 4.1.2
1. 5. 1 Varistors across the mains
Accepted by all countries (when the varistor is separately
certified)
Varistors across the mains with a protective device to guard
against short-circuit.
Accepted by all countries (whether the varistor is separately
certified or not)
Varistors between the mains and the protective earth:
1. For Pluggable equipment, type A:
Accepted by all countries (when the varistor is separately
certified)
except
Austria, Belgium, Denmark, Finland, Germany, Norway,
Sweden, United Kingdom
2. For pluggable equipment Type B and permanently
connected equipment, connected to protective earth:
Accepted by all countries(when the varistor is separately
certified)
A combination of a varistor(when the varistor is separately certified) in series with a spark gap /Gas-Tube (the varistor need not be separately certified) between the mains and the protective earth and with a protective device to guard against short-circuit:
1. Pluggable equipment Type A:
Accepted by all countries
2. Pluggable equipment Type B and permanently connected equipment:
accepted by all countries
NB: Where the term "separately certified" is applied to a varistor in the above, this means that the varistor is
separately certified according to Publications IEC 61051-1
98/2
95/10
EA(FI)
1/91
EE(Chm)
1/94
EE(Chm)
3/03
EE(Chm)5/
98
EE(Chm)
3/03
EE(Chm)5/
95
4.3
6.10
6.18
6.2.1
9.5
6.2.1
9.5and IEC 61051-2 or according to CECC 42200.
Varistors (VDR`s) may burn or burst during life-time due to an increasing temperature stress caused by increase of leakage current with a number of switching cycles in the VDR. This is suitable protected where a gas-filled surgearrestor (gas tube) is in line with the VDR. In circuits where no gas tube is required a thermal interrupting device on the VDR connected in series with the VDR is to be provided. Compliance criteria ref. sub clause 5.3.8.1”
1. 5. 1 The following table should be used as guidance when
assessing the use of CSA and/or UL type fuses in
equipment:
Fuse rating (A) Max S/C Current (A)
1 or less 35
1 to 3.5 100
3.5 to 10 200
10 to 15 750
15 to 30 1500 Table derived from
CSA248.14/UL248
.14 Clause 5.5
Table A
EA(GB)
3/93 6.6
1. 5. 1. We may accept resistors on the primary side to be
used as ”protective device”, provided that they comply
with all the following conditions
-it shall operate satisfactory when the appliance is tested
according to EN 60950. Compliance is checked by repeating
at least 10 times, each case with a new resistor during worst
case fault condition test, when the appliance is directly
connected to the mains. The resistor may not interrupt with
explosion or spark/flame which are not in compliance with the
standard.
-Not accepted in operator access area
-The resistor is to be listed as critical component in the test
report.
-Identification using part number or the like is to be located
adjacent to the resistor, or use of cross-reference in the
service documentation as described in 1.7.6, last paragraph.
-the component shall be available as spare part in the country
where the appliance is sold.
And in addition a data sheet is provided showing all the
relevant data for the resistor 99/1
EE(Chm)7/
99
9.11. 5. 2 Subject: acceptance of UL/CSA certified units in
end-use racks/equipment
When evaluating end-use equipment like large
telecom racks composed by several units
("drawers") for building-in like computer
machines, modems, routers etc., for national mark
certification or ENEC or IECEE/CB, the separately
approved units (computers, modems etc.) bearing a
CCA mark are accepted with limited investigation
(e.g. consisting in the check of compatibility of
the certification Ambient temperature with the
end-use equipment specified ambient; input voltage
rating with the one of the end-use equipment
etc.); they will then subjected to the end-use
equipment tests (e.g. electric strength, total
leakage current, capacitor discharge etc).
Which is the delegate position in regard to the
acceptance of UL Listed or CSA Certified drawers
(no CCA mark, no CB report) in such racks when the
certification Standard was UL 1950 3rd edition
(based on IEC 950 2nd Ed) or UL 60950 (based on
IEC 60950 3rd Ed) as long as all the differences
between the UL requirements and the IEC based
Standard and between the IEC based Standard and
the current IEC Standard used for the end-use
equipment have been checked and satisfied?
All critical components have to be certified to the relevant
EN or IEC component standard. Acceptance of components
has to follow CCA /228-1 "Recognition of components"
In the special case mentioned, we need a test-report and a
certificate showing compliance to EN 60950 EN 60950:1999 and
EN 60950-1:2000
02/11 EE(Chm)
3/02
10.3
1. 5. 6. There is no need for a CCA approval for every single
component. There should be sufficient documentation of
the certification of the component and the IEC or CENELEC
standards used. Nevertheless the appropriate use of the
component has to be checked.
For Capacitors the edition of the standard should be given 95/1 EE/Chm)
5/95
5.1.2
1.. 5. 7.1 Capacitors certified to IEC 60384-14 1.ed will be accepted
for 5 years after DOW of EN 132400 .
Capacitors certified to IEC 60384-14 2.ed and/or EN132400 are acceptable .
Y1 and Y2 capacitors are accepted across basic insulation
Y1 and Y2 capacitors are accepted across supplementary insulation .
The enclosures of Y1 capacitors are considered to comply
with the requirements for reinforced insulation with the exception of the area near to the leads where the insulation becomes thinner
95/9
97/1 EE(Ch m)5/95 EE(Ch m)5/97 9.3
3.
1. 5. 7.2
Is it possible to bridge a TNV barrier with one resistor/ two resistors?
Subclause 1.5.7.2 establishes the principle that two resistors can be connected in series across a double / reinforced insulation provided the are the same value, they each comply with the creepage and clearance
requirements and the accessible circuits comply with the Limited current circuits requirements.
Subclause 6.1.2.1 indicates that components across the barrier can be removed during the electric strength test provided the circuit complies with the 10mA limit during the test described in figure 6A.
One resistor across the TNV barrier is allowed provided that the tests of Scl. 6.1.2.1 and 6.2 are passed and the
requirements for creepage distances and clearances and the requirements of Scl. 5.1.8 are fulfilled.
02/12 EE(Chm)3/02
10.4 1. 7.
1 If the rated voltage marked on the equipment exceeds
250V then the components should also be suitable for this voltage. 96/2
EE(Chm)5/96
6.6 1.
7.
1 Laptop computers, which are supplied by SELV and in
which hazardous voltages are generated, cannot be Class III and therefore must be Class I or Class II. If they are designated Class II, the double square symbol shall be required.
It was agreed that a
lap-top or notebook computer supplied from SELV circuits and in which circuits at voltages which exceed 42.4 V peak or 60V DC
complying as limited current circuits is considered to comply with the
definition of Class III equipment
EA(FI) 3/91 EE(Chm)1/94 4.11
6.12
1. 7.
1 Only the set one voltage of an internal voltage regulating
device should be indicated on the outside
EE(Chm)1/94
10.3
1. 7. 1 Safety related components shall be marked with a trade
mark (logo) and an identification number or code. For a
component without independent certification that is
dedicated for use in one or more specific models the
identification may be in a form of a code 00/8
EE(Chm)5/
00
10.5
1. 7. 2 Safety relevant documentation has to be as a hardcopy.
The Users Manual may also be on a diskette 95/11
EE(Chm)5/
95
9.7
1. 7. 2 A Class III equipment with an enclosure made of HB-
material and using a non-special connector for the
AC/DC input has to have a marking stating the
following:
"For use only with power supply MANUFACTURER,
MODEL"
This statement shall also be in the user-instructions.
Alternative marking:
"Use only power supplies listed in the user-
instructions"
or
"For applicable power supplies see user-
instructions"
This statement shall also be in the user-instructions.
The user instructions must then have a listing of
manufacturer and model of the relevant power supplies.
Method 2 of 4.7.1 of EN 60950:2000 is recommended. 99/2
EE(Chm)7/
99
EE/Chm)
1/2001
9.3
6.2
1. 7. 6 The wording "special fusing characteristics" includes
braking capacity. To be able to accept one fuse marking in
Europe, in the USA and in Canada, markings "mA" and "A"
can still be accepted. Therefore the following kind of
markings are accepted:
T315mA L F4A H
250 V 250 V EA(FI)
1/91 4.5
1. 7. 8.3 It is not acceptable to mark "I" and "0" on a functional
switch of a lap-top or notebook computer where for
example the charging circuit is energised at all times.
No marking at all is acceptable.
The marking “POWER” is not acceptable. 99/3
EA(GB)3/9
3
EE(Chm)
6.3
9.4
1. 7. 12 Testing houses shall put a note in the test report
mentioning in which language the markings regarding
safety has been checked.
Safety markings in all official languages of CENELEC
countries need not be checked when the CCA certificate is
issued. EA(FI)
3/91 4.15
1. 7. 15 Lithium batteries included in integrated circuits are not
considered as replaceable.
There must be an advise in the service manual concerning
the disposal of these parts. 95/13
EE(Chm)5/
95
9.8.2. 1. 1 A modem-card if it is separately sold and intended for use
in operator access areas, has to be tested for the relevant
protection of TNV-circuits 99/4
EE(Chm)7/
99
9.5
2. 1. 1.4 Double or reinforced insulation shall also be required
between wires in SELV circuits and metal parts with
hazardous voltages inside the equipment.
EA(FI)
3/91
EE(Chm)1/
94
4.1.5
6.13
2. 1. 2 Products which are considered completely hazardous when
covers are removed do not need additional protection e.g.
monitors. Opening of an enclosure of a monitor is
considered to be intentional because inside the equipment
there are not parts which need servicing, but repairing. EA(FI)
3/91 4.5
2. 2. 4 SELV circuits can be connected to non-SELV circuit if the
equipment still complies with the requirement of Scl. 2.2 in
case of single fault condition. EA(FI)
1/91 4.10
2. 2. 4. DC centralized battery systems Voltage in
Telecommunication Central offices:
Following the IEC TR 62102, Annex B, a 75 V dc stationary
battery system is considered TNV 2 and double or
reinforced insulation from the mains is required. The
installation instructions should provide guidance on how to
ensure that the system will not become hazardous after a
single fault according to 1.7.2.” Confirmed by
WG7 of TC108
03/5 EE(Chm)
3/03
5.1.9
2. 2. 5 Until the standard is changed condition 2 to table 9 should
be read as follows:
Overcurrent protective devices within the equipment shall
be bypassed in turn. TO BE
RECONSIDERED
95/19 EE(Chm)5/
95
9.17
2. 4. 2 When checking the frequency and for the calculation of the
maximum peak current the frequency measured when the
circuit is loaded with a 2000 Ohms resistor is considered to
be the value to be used. IEC-TC74/WG8 is
of the same
opinion.
EE(Chm)1/
94 10.7
2. 4. 2 As already covered in the above decision 2.4.2 from 1994 the
maximum peak current and the frequency measured when
the circuit is loaded with the 2 kOhm resistor has to be
considered. If there is still a second frequency (envelope
waveform) the most unfavourable value has to be taken into
account .
In the case mentioned 330 Hz is the decisive frequency.The chairman of
TC74WG5 advised to
use the measuring
network of Annex D
Figure D.1 which
takes all frequency-
problems into
account. He is
preparing a paper on
the problems of
different frequencies
in touch currents. I
will circulate that
paper as soon as it is
available.
00/9 EE(Chm)5/
00
10.9
2. 5 Higher voltages are not allowed (Tables 2B and 2C to be
followed). Behind a limited power source higher voltages
can be created within secondary circuits out of the low
voltage output of the limited power source. HB material is
possible, even if there is for example a 1000V back-light
source. However, an assessment has to be made to ensure
that there is no fire or ignition hazard. 98/5
EE(Chm)5/
98
9.14
2. 5
Limited Power Source (Battery supplied equipment) Battery supplied equipment with an enclosure of HB-material shall only be used with batteries that are in compliance with LPS. Alternative batteries on the market may not comply with LPS limits, and shall therefore not be used with such equipment.
With reference to the decision 99/2 to 1.7.2 for use of alternative Power Supplies (ref. below), it is proposed to consider a similar decision for alternative batteries for battery supplied equipment with an enclosure of HB-material.
Battery supplied equipment with an enclosure of HB-material has to have a marking stating the following, as the battery is to comply with the requirements for LPS:
"For use only with battery MANUFACTURER, MODEL" This statement shall also be in the user-instructions .
Alternative marking:
"Use only batteries listed in the user-instructions" or
"For batteries see user-instructions "
This statement shall also be in the user-instructions.
The user instructions must then have a listing of manufacturer and model of the relevant batteries .
02/13
EE(Chm)3/02
10.7 2. 6
It is acceptable to use a track on a PCB as the safety earth path, provided it meets the requirements of the relevant tests.
EA(GB)3/9
3
6.10
2. 6.
3.3 Subject: protective bonding conductor test current and
duration for DC powered equipment rated in excess of 16 A
Sub clause: 2.6.3.3/2.6.3.3/2.6.3.4
Question:
The referenced Standards indicate that the protective bonding conductor test current and its duration for DC powered equipment are specified by the manufacturer when the current rating exceeds 16 A.
Which are the minimum current and time values we should accept for such test ?
The current rating of the circuit means the current rating of the protective device (See meeting of WG8 of IEC TC74 in Helsinki).
When the manufacturer specifies a test current and duration, that current and duration shall first be used to check that the protective device will operate in this condition. If the
protective device does operate, the test current and duration specified by the manufacturer shall be used to test the protective bonding conductor. If the protective device does not operate, the testing laboratory shall ask the manufacturer to specify a more suitable combination of test current and duration.
IEC60950:1999 and IEC60950-1:2000 02/14 EE(Chm)
3/02
10.8
2. 6 5.7 Internal connections for earthing continuity purpose achieved by one rivet in combination with a lock washer are acceptable.
EE(Chm)1/94
10.8
for fuse-links inside the equipment are as follows:
Pluggable Equipment Type A
Denmark 16 A
Finland 16 A
Norway 16
A
Sweden 16
A
Switzerland 10
A
United Kingdom 16 A EA(FI)
3/91 3.4
2. 7. 4 Two protective devices may be required in equipment
intended to be connected to an IT power system. In Norway IT
power system is
used. However,
only one
protective device
can be accepted
there.
EA(FI)
1/91 4.7.1
2. 7. 4 One fuse is acceptable based on the judgement that the
installation fuse could protect the appliance in every earth
fault case EE(Chm)1/
94 10.8
2. 10. Partial discharge test, VDE 0884, is not accepted for the
time being. EA(FI)
3/91 4.1.1
2. 10. The insulation of an accessible LED which is connected to
hazardous voltage shall fulfil the requirements of Clause
2.10, but is not tested with the steel sphere.
The foil of a membrane switch is allowed to be used as
insulation against hazardous voltages if the mechanical
construction provides sufficient strength and lifetime. EE(Chm)1/
94 10.10
2. 10. The insulation between the heat sink and the current
carrying parts of an electronic component (oxide layer) can
only be considered as functional insulation. EE(Chm)1/
94 10.11
2. 10. The insulation of the outside of a capacitor according to IEC
60384-14 2.ed. fulfils the requirements for basic insulation.
For reinforced insulation the distance requirements of EN
60065 and EN 60950 must be fulfilled 95/8
EE(Chm)5
(95
8.2
2. 10 Insulation between parts directly connected to the mains in
front of a fuse has to fulfil the requirements for operational
insulation or pass the test of 5.3.4 b). 95/14
EE(Chm)5/
95
9.12
2. 10. For judging distances (combination of creepage and
clearance) from the high voltage connection of a CRT table
2Kor, according to subclause 2.1.1.1 (Paragraph after Note
4) the dielectric strength test is to be used.
Reinforced insulation is required to the outer surface of an
enclosure (when of insulating material) and operational
insulation is required to an internal, earthed part. 95/15 EE(Chm)5/
95
9.12
2. 10 According to
3.1.4 the insulation of primary and secondary
lead outs need only to fulfil the dielectric strength test. 95/16
EE(Chm)5/
95
9.13
2. 10. 1 Force of 10 N shall be applied to all internal parts whether
they are accessible or not. (See 4.2.2) EA(FI)
3/91 4.1.6OSM/EE(Chm)8/03 Standard EN 60 950 3rd Edition and EN 60950-1
Clause Decision Comments Dec.
No. Ref. Doc. Item
of
Doc.
2. 10. 2 In a transformer the highest occurring working voltage is the
basis for insulation requirements. Outside the transformer
the actually measured voltage is used . If two or more
secondary windings are connected together even outside
the transformer the actually measured voltage on each
winding is the basis for insulation requirements provided
that the relevant windings are insulated from each other
inside the transformer.
If the secondary voltage is not accessible only functional
insulation is necessary. EE(Chm)1/
94 10.5
10.6
2. 10. 2 There is an LC ignitor for a high pressure lamp. The open
output voltage of the ignitor is as indicated in the
figure.
One ignition cycle takes approx. 4 seconds. During these
4 seconds Upp is approx.
5 KV during max. 1 second. after
1 second the voltage decreases to approx 500 Vpp and
after the 4 seconds the cycle stops (no output).
If a lamp is connected and ignites the cycle will stop
immediately, the normal lamp output voltage is approx.
Question:
Do delegates agree with the proposal for Amd 1 of IEC
60950-1 and therefore see the described signal as a
starting pulse and its rms value not taken into account
when determine the minimum creepage distance.
If so, what about the pulse duration? Is e.g a pulse
duration of 5 seconds acceptable or 10 seconds ?
“At the moment it is advised to use the table of IEC/EN
60926."
We have to take into account repeatable high voltage if the
lamp does not conduct (during start or in fault conditions)” The ongoing work in
TC74 WG6 (now
TC108-74TT-
WG6)will be
monitored. The
latest paper will be
distributed for
information.
02/18 EE(Chm)
3/02
12.4
2. 10. 4 Table 2L stops at 1kV working voltage for Pollution degree
2 and 3. For higher voltages Table 4 of HD 625.1 S1 (IEC
606-1) has to be used 98/4
EE(Chm)5/
98
9.9
2. 10. 4 In a 5V circuit on the primary side of a switched mode
power supply, having a direct connection to the mains (230
V ac), the working voltage to be used for table 6 is 250V ac.
If the working voltage is lower than 250V it is seen as 250V.
If it is higher, distances have to be calculated according to
2.10and where a higher working voltage than the mains
voltage (250V) is present, higher requirements for creepage distances, clearances and insulation (high-pot) tests have to be taken into account. 97/10
EA(GB)3/9
3
EE(Chm)5/
97
6.11
9.8OSM/EE(Chm)8/03 Standard EN 60 950 3rd Edition and EN 60950-1
Clause Decision Comments Dec.
No. Ref. Doc. Item
of
Doc.
2. 10.
3.2 Table 2J stops at 1300V repetitive voltage. For higher
voltages extrapolation of the table is possible. 98/3
EE/Chm)5/
98
9.8
2. 10. 5 The plastic enclosure of a semiconductor can be
considered as basic insulation. These components
including alternatives must be listed in the list of critical
components and there must be a remark in the service
documentation 95/17
EE(Chm)5/
95
9.14
2. 10. 5. Requirements for a tape for insulation:
Based on cl 1.3.4, when an adhesive is required to maintain
a level of safety (e.g. adhesive tape), then it is
recommended to apply the cl 4.6.5. Provisional, waiting
for TC108/MT2
confirmation
03/7 EE(Chm)
3/03
12.4
2. 10. 5.1 Insulation between semiconductors (mains) and heat sinks
Either a second sheet is required or it must be checked
whether the distance through insulation has to be increased
to comply with the requirements of clauses 4 and 5. 95/7
EE(Chm)5/
95
8.1
2. 10. 5.2 2.10.5.2 is not to be used for winding wires only 2.10.5.4.
applies. 96/15
EE(Chm)5/
96
10.2
2. 10. 5.2 The tests on non-separable 3-layer foils are done on a
separate sample using a test voltage of 4,5 kV (3*1,5 kV)
for reinforced insulation Decision made in
the 37.meeting of
TC74 WG6 in
Stuttgart
EE(Chm)5/
00
TC74/WG
6(Secretar
y) 25
12.3
37.9.1
2. 10. 8. The requirements for distances through insulation are to be
applied to lateral separation between layers provided that
the thermal cycling test is passed 95/2
EE(Chm)5/
95
5.1.7
2. 10. 5.4 2.10.5.4 could also be used for similar insulation materials
than polyimide as long as they comply with the tests of
Annex U. 96/16
EE(Chm)5/
96
10.2
3. 4. 2 In a pluggable equipment the mains plug can be considered
as a disconnect device. Disconnect device shall either be a
double pole mains switch (IT power system: all-pole mains
switch) or a mains plug.
Therefore in a pluggable equipment a single pole mains
switch or a micro switch can be accepted. In a pluggable
equipment a semiconductor or a combination of
semiconductors can perform functional switching for stand-
by operation. EA(FI)
1/91
4.8
and
4.9
4. 3. 4 Force of 10 N shall not be used for testing the compliance
of § 4.3.4 . Securing of wires is important. The natural
movement of the components shall be taken into account. EA(FI)
3/91 4.8
4. 3. 4 A heat shrinkable tubing is an acceptable means for
additional securement to single clamping or soldering of
internal wiring, but not for the termination of the mains cord. 95/4
EE(Chm)5/
95
5.1.11
4. 3. 5 If there is a possibility of mis-mating of modular connectors
(e.g. RJ-11, RJ-12 etc.) accessible for the user, tests have to
be made to verify that the SELV limits remain.
If the voltage of the TNV-circuit is known this value is used,
otherwise the test generator of 2.3.5 (Figure 2E) is used for
testing. 98/6
EE(Ch
m)5/98
9.14
4. 3. 6 Every NTR concerning an equipment with plugs as part of
the enclosure shall have additional information about the
tests made on the plug. The circulated 2 pages gives an
example, for class II plugs. Class I plugs shall be handled
accordingly. 96/10
EE(Ch
m)5/96
8.1
4. 3. 8 The requirements for lithium cells apply to separate devices
such as memory cards, remote control units etc. EA(GB)3
/93 6.18
4. 3. 8 When calculating the reverse current the voltage of the
battery is considered to be zero. 95/13
EE(Chm
)5/95
9.8.
4. 3. 13 If one type of display tube has been tested for ionising
radiation, similar types can be accepted without test. The
ionisation test shall be carried out under normal operating
conditions. EA(GB)3
/93
6.16
4. 3. 13 For apparatus comprising a laser product the class, the
laser-data and the relevant warning marking shall be stated
in the test report 96/4
EE(Chm)
5/95
EE(Chm)
5/96
10.12
6.22
4. 4. If it is clearly evident that there are no hazardous moving
parts, then marking detailed in this clause is not required. EA(GB)3/9
3 6.32
4. 4. 2 Protection in Operator Access area
Small spinning fans (typically 5-8 cm size), in User
Accessible area may be evaluated different due to 4.4.2,
consideration of hazardous moving parts. The access to
the fan may be directly from the outside, or when opening
a door or cover.
What should be the criteria for when access to such a
small spinning fan is considered as hazardous moving
part, requiring a guard? (Speed, sharpness of blades etc.
causing possible injury to e.g. fingers)
EN 60335-2-80 specifies the following:
Scl.: 20.101:
Fan blades, other than those of fans for mounting at high
level, shall be guarded unless their leading edges and tips
are rounded and
- they have a hardness less than D 60 Shore, or
- they have a peripheral speed less than 15 m/s when the fan is supplied at rated voltage, or
- the fan has a power output not exceeding 2W when
supplied at rated voltage.
NOTE: An edge with a radius of not less than 0,5 mm is considered rounded.
Compliance is checked by inspection and by measurement 02/20
EE(Chm)
3/02
10.10
4. 5 The original, not a copy, of CCITT test form No 3 shall be
used at the heating test in normal use of telefaxes.
An alternative means is the Test Form Nr.4 named "Black-
White facsimile test chart BW01 (ITU-T test chart No,: 4) 98/1
EA(FI)
3/91
EE(Chm)5/
98
5.2
4. 5 A thin plastic coating (spraying) on the external surface of
the metal enclosure is not taken into account when
determining the temperature rise on touchable metal parts. EA(FI)
3/91 4.3.2
4. 5 For the heating test requirements of optocouplers,
reference should be made to manufacturer's data for
maximum operating temperature as well as manufacturer's
data for input and output currents. It should be ensured
that the optocoupler is operating within it's design
parameters. EA(GB)3/9
3 6.244. 5 a) A declaration with adequate information from the
equipment manufacturer is accepted to classify insulating
materials.
b) Information from the UL-Yellow-Book may be taken into
account.
c) In the case of different insulating systems the material
with the lowest operating temperature is governing the total
operating temperature of the system 95/22
EE(Chm)5/
95
9.21
4. 5 For the acceptance of coils of RFI filters Table 16 condition
5 should be taken into account.
With reference to Condition 5 of Table 4A temperature
limits on individual coils, being part of RFI filters, can be
accepted according to component rating. 98/7
EE(Chm)5/
98
9.15
4. 6. 1 The requirements of this Sub-clause are applicable to the
fire enclosure and the electrical enclosure. EA(GB)3/9
3 6.17
4. 6. 2 Following construction is accepted:
There are openings in the bottom of a fire enclosure which
are larger than 40 mm². Above these openings there is a
printed board which is horizontally mounted. The
components are on the upper side of the printed board. The
printed board fulfils the requirement of V-1 material. This decision is
applicable to
equipment with a
mass exceeding
18 kg. Compliance
clause in 4.6.2
covers this
problem
EA(FI)
1/91
EE(Chm)5/
96
4.12.3
6.25
4. 6. 2 It is acceptable to have a printed circuit board (above a fire
enclosure having holes greater than 40mm²) having holes of
less than 40mm², if the components close to the holes
comply with flammability class V1. EA(GB)3/9
3 6.21
4. 6. 5 Compliance is checked by examination of the construction
and of the available data. If such data is not available,
compliance is checked by the following tests.
1. What documentation is required? E.g. description
of the materials from which the adhesive is composed +
test results of a cyclic test of 600 hours at -30°C to
+70°C.
Is this sufficient for parts not subject to heat?
2. Is a UL 746C (Polymeric Materials - use in
electrical evaluation) approved adhesive acceptable?
3. Is a prove as resistance to heat at 90°C (UL RTI
90, QMFZ2) sufficient?
Other
We do not have sufficient experience to be sure that any of
the suggested conditions or tests in item 1,2 or 3 above are
equal to or better than the requirements in 4.6.5 or 4.3.22.
Available data have to prove compliance with the
requirements of 4.3.22 or 4.6.5. If not the relevant tests have
to be applied. 02/17
EE(Chm)3/
02
12.1OSM/EE(Chm)8/03 Standard EN 60 950 3rd Edition and EN 60950-1
Clause Decision Comments Dec.
No. Ref. Doc. Item
of
Doc.
4. 7 Declaration of used materials with adequate information
from the equipment manufacturer is acceptable.
Furthermore, the flame resistance of plastic materials listed
in the UL Yellow Book can be taken into account when
checking the compliance with § 4.7.3
In the flammability assessment of PCB's a declaration that
the manufacturer uses V0 or V1 rated PCB's as required is
acceptable.
The test report should detail material manufacturer, type
reference and flammability rating as a minimum for other
materials
In cases where the equipment manufacturer is unable to
obtain the appropriate information, due to the unwillingness
of the component manufacturer to divulge proprietary data,
acceptance may be based on a Certificate of Conformity, or
written declaration, from the component manufacturer,
detailing the flammability rating of the plastic materials. Note: This exception is not allowed for enclosure materials, which must also meet the requirements of clause 4.2 (Mechanical strength and stress relief) 95/3
EA(FI)
1/91
EA(GB)
3/93
EE(Chm)
1/94
EE(Chm)5/
95
4.12.1
6.39
6.16
5.1.9
4. 7 Components may be considered to have individual fire
enclosures.
Thin tape can be used to provide a fire enclosure for
transformer windings etc, provided the tape meets V1
minimum or the complete transformer including the tape
meets Appendix A2 test. A2 will be deleted
with Amendment
196/5 EE(Chm)5/
96
6.23
4. 7 Small openings in small electromagnets, motors etc should
meet the requirements of 4.6 EA(GB)3/9
3 6.35
4. 7 Small parts of HB materials in a fire enclosure can be
accepted based on the judgement that they have adequate
spacings from ignition sources 95/20
EE(Chm)5/
95
9.19
4. 7 If the product enclosure is made of HB material there have
to be internal fire enclosures for parts where the limited
power source output criteria is not met. 95/21
EE(Chm)5/
95
9.20
4. 7. If the battery is within a fire enclosure we could accept a
material HB or better, based on the experience in EN
50091-1-1 Sect. 4.4.3.3. 99/5
EE(Chm)7/
99
9.13a
4. 7. 2.1 Parts requiring a fire enclosure
Some apparatus powered only by batteries are not required
to have a fire enclosure because beyond the batteries the
power is limited by PTC's or other devices according to
2.5. However the batteries are not power limited
therefore fire enclosure is needed.
Do you agree to consider the metal can of the battery
acting as fire enclosure?
The metal case of the battery can be considered as fire
enclosure, but the battery has also to comply with 4.3.8. 02/15
EE(Chm)
3/02
10.13
4. 7. 3 Materials of coil formers and partition walls shall fulfil the
requirement of V-2 material.
EA(FI)
1/91
EE(Chm)1/
94
4.12.3
6.14
4. 7. 3.2 Liquid crystal display (LCD) is tested as a "sandwich" and it
shall fulfil the requirement of a fire enclosure. EA(FI)
1/91 4.12.34. 7. 3.2 Enclosures of a keyboard or similar devices (e.g. mouse,
trackball) can be accepted to be made of material class HB
based on abnormal test. 95/24
EE(Chm)5/
95
9.27
4. 7. 3.2 The 13mm requirement of clause 4.7.3.2 is not relevant to
the requirements of clause 4.6. EA(GB)3/9
3 6.22
4. 7. 3.2 Thin metal foil may be used in the construction of a fire
enclosure (on HB material) provided:
1. The complete enclosure shall be tested to Appendix A1
or A2.
2. The foil covers all areas where there is a source of
ignition.
The use of metalised coating sprayed on the inside of an
enclosure made of HB-material is also acceptable provided
the tests according to Appendix A1 or A2 are met There is no
mechanical
strength
requirement on the
foil other than that
for the enclosure.
EA(GB)3/9
3
EE(Chm)1/
94
6.23
6.15
4. 7. 3.2 Materials of Fire Enclosure
LCD projectors (typical weight 1 - 5 Kg, intended for
ceiling mounting and/or transportable use together with
notebook computers) being evaluated, offers a ceiling
mount accessory kit. The kit has two major parts: one
piece mounts to the ceiling with permanent fasteners, the
other piece attaches to the projector with screws. Both
halves go together by aligning each half to a specified
feature and twisting them into position. The halves are
locked into place by turning knurled screws with finger
pressure. Mounting and un-mounting the units do not
require the use of tools.
Do the delegates agree that if the projector can be
fixed to the ceiling by any manner, even without
requiring the use of tools, the product must be
considered as Fixed and therefore the fire enclosure
must be rated 94-5V ?
For projectors specified by the manufacturer for ceiling
mounting, with or without a tool, the fire enclosure must be
rated 5V or better. 02/16
EE(Chm)
3/02
10.13
5. 3 Fault condition tests shall be carried out with 16 A
installation fuses. EA(FI)
1/91 4.11.1
5. 3 Fault condition tests shall be considered and they have to
be done even in the secondary circuit, if there is a risk of
damage to supplementary or reinforced insulation. EA(FI)
3/91 3.5
5. 3 According to EN 60127 a fuse will not break within 30
minutes at less than 2.1 times the rated current. Therefore,
if the current through the fuse does not exceed this value
after the failure is introduced, the fuse will not blow and the
test is run until steady state conditions are obtained 95/5
EE(Chm)5/
95
5.1.17
5. 3 PTC resistors which are certified according to Publ. IEC
60738-1 need not be short circuited under fault conditions 97/7
EE(Chm)5/
97
9.19
5. 3 Components can be short-circuited whether they are
separately approved or not. However, if a component
complies with requirements for reinforced insulation, it shall
not be short-circuited. EA(FI)
1/91 4.11.1
5. 3. 8 Higher temperature rises than 300°C can be accepted if the
manufacturer has proved that the material in question
withstands the temperature. EA(FI)
3/91 3.56.
6. 1
2.
The figure shows a circuitry which is connected to a Telecommu-nication
network.
Based on the network a TNV 1 situation applies.
T1 is a separation transformer which withstands 1500 Vac ES test.
This transformer is due to a functional concept bridged by a resistor of 38
Kohm to earth and by another resitor of 38 kohm to a 48 Vdc circuit which
only has functional insulation to SELV (e.g. a RS 232 communication port)
The equipment is pluggable type-A but will only be installed by a Service
Person and the installation instructions require it to be connected to an
earthed socket outlet.
So for the protection of Telecom network users from hazards in the
equipment the exclusions of 6.1.2.2 applies.
which means the resistor of 38 Kohm to earth is allowed for this
application and can be accepted without ES test
For the resistor to the 48 Vdc circuitry cl 6.2 applies (protection of
equipment users from overvoltages on telecom networks )
In this case there is only functional insulation to SELVand the circuit does
not withstand the ES test between the connection for telecom network and
RS-232 connector (SELV)
Cl. 6.2.1 says the following
equipment shall provide adequate electrical separation between a TNV-1
CIRCUIT or a TNV-3
CIRCUIT and the following parts of the equipment.
a) Unearthed conductive parts and non-conductive parts of the equipment
expected to be held or touched during normal use (for example, a
telephone handset or a keyboard).
b) Parts and circuitry that can be touched by the test finger, figure 2A (see
2.1.1.1), except contacts of connectors that cannot be touched by the
test probe, figure 2C (see 2.1.1.1).
c) An SELV CIRCUIT, a TNV-2 CIRCUIT or a LIMITED CURRENT
CIRCUIT provided for connection of other equipment. The requirement
for separation applies whether or not this circuit is accessible.
These requirements do not apply where circuit analysis and equipment
investigation indicate
that safety is assured by other means, for example, between two circuits
each of which has a
permanent connection to protective earth.
Question:
Is it necessary for compliance to perform the test acc to 6.2.2.1 (impulse
test) or 6.2.2.2 (steady state ES test), or can we accept this situation without
testing if the following applies:
Separate approved surge suppressors are provided which limit an incoming
transient voltage to a level of max 70 V before the resistor. Circuit analysis
shows that this will never result in a hazardous voltage on the RS 232 port
(SELV).
If it is obvious that the product will fulfil the requirements no
test is necessary.
Otherwise the tests have to be performed due to the
requirements of 6.2.2.3.
Confirmed by
TC108-WG7
03/4
EE(Chm)
3/03
5.1.8
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