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CERTIFICATION IMPACT ANALYSIS:
(UL) IEC 60950-1, EDITION No. 2, AMENDMENT No. 2
Safety of Information Technology Equipment
Technical Editor: Thomas M. Burke
Principal Engineer – ICT, Consumer Technology Division
UL LLC
This analysis is intended to identify and analyze the impact of notable differences between
the latest versions of the IEC and UL standards for Safety of Information Technology
Equipment (ITE) and their predecessors. In particular, the Second Amendment to IEC
60950-1 Second Edition is being analyzed and compared to its predecessors, mainly IEC
60950-1 Second Edition, Amendment No. 1 and UL 60950-1 Second Edition.
Amendment No. 2 to IEC 60950-1 Second Edition was published in May 2013. The
corresponding revisions to CSA CC2.2 No. 60950-1/UL 60950-1, Second Edition, were
published on October 14, 2014, and this Analysis also includes analysis of any changes to
the National Differences associated with the latest bi-national standard.
This Analysis also will make note of any new Common and Special National Conditions
associated with EN 60950-1:2006/A1:2010/A2:2013 (August 2014) that are
considered noteworthy due to potential impact on global products. (To date, non-have been
identified specifically associated with A2.)
This analysis will permit persons already familiar with IEC 60950-1 and UL 60950-1 to
become familiar with the likely impact on ITE of the latest IEC and UL ITE Safety Standards.
Other select observations are included that may be of interest to the reader. This analysis
will be updated as additional information on the application of the new Standards becomes
known.
One key thing to keep in mind is that IEC TC108 has made a commitment to limit further
revision of IEC 60950-1 and concentrate its work and effort on IEC 62368-1,
Audio/video, information and communication technology equipment – Part 1:
Safety requirements, the Standard that eventually will replace IEC 60065 (AV Equipment)
and IEC 60950-1 (ICT Equipment). (Edition No. 2 of IEC 62368-1 was published in February
2014.) Therefore, most of these changes in Amendment No. 2 were adopted to allow for
continued effective application of IEC 60950-1 during the transition.
Background
IEC 60950-1 is the International Standard for Safety of Information Technology Equipment.
It encompasses under its scope information technology equipment, communication
technology equipment, office appliances and multi-media equipment for use in the home,
office, business, school, computer room and similar locations.
IEC 60950-1 is developed/maintained by IEC Technical Committee (TC) 108, Maintenance
Team No. 2 (MT2): Safety and Energy Efficiency of Information Technology Equipment.
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IEC TC 108 also is responsible for,
• IEC 60950-21, Information technology equipment – Safety – Part 21: Remote power
feeding;
• IEC 60950-22, Safety of Information Technology Equipment – Part 22: Equipment
Installed Outdoors;
• IEC 60950-23, Safety of Information Technology Equipment – Part 23: Large Data
Storage Equipment;
• IEC 60990, Methods of Measurement of Touch Current and Protective Conductor
Current;
• IEC 62151, Safety of Equipment Electrically Connected to a Telecommunication
Network;
• IEC/TR 62102, Electrical Safety - Classification of Interfaces for Equipment to be
Connected to Information Technology and Communications Technology Networks; and
• IEC/TS 62367 – Safety aspects for xDSL signals on circuits connected to
telecommunication networks.
In the U.S. and Canada, the current ITE Bi-National Standard (BNS), formally designated
CSA C22.2 No. 60950-1/UL 60950-1, Second Edition, is based on the Second Edition of IEC
60950-1, including Amendment Nos. 1 and 2. Like its predecessors includes U.S./Canadian
deviations (National Differences) to address needed national requirements that are not in
the base IEC document.
The technical content of the BNS is developed and maintained by the Technical
Harmonization Committee (THC), Maintenance Team No. 2 (MT2), which consists of
representation from UL, CSA, and several U.S. and Canadian IT and communication
technology equipment industry groups.
The Effective Date for UL 60950-1 Second Edition is outlined on the UL website -
http://industries.ul.com/blog/effective-date-information/.
Notes to this Analysis:
• Unless otherwise noted, all Sub-clause/Annex references are to the Amendment No. 2 of
IEC 60950-1, Edition No. 2.
• Discussion of changes and differences associated with Amendment No. 2 to IEC 60950-
1, Second Edition is in plain text.
• Discussion of new or revised national differences specifically associated with October 14,
2014 revisions of the Bi-National Standard, CSA C22.2 No. 60950-1/UL 60950-1,
Second Edition are noted, CAN/U.S. ND.
• Discussion of new or revised special national conditions (differences) associated with
CENELEC EN 60950-1:2006/A1:2010/A2:2013 are noted, CENELEC ND.
Explanation of Impact Statements: Statement Impact
None Anticipate no impact on the present certification
practice of most ITE due to the change.
Minor* Anticipate limited impact on the present
certification practice of some, or all ITE due to the
change.
Considerable* Anticipate considerable impact on the present
certification practice of some, or all ITE due to the
change.
Ver.2.5: January 16, 2015 Page 3 of 23
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* For new/revised requirements that are considered at this time more onerous than
existing requirements, the Impact Statement (Minor, Considerable) will be followed by a
(+). For new/revised requirements that are considered at this time less onerous than
existing requirements, the Impact Statement (Minor, Considerable) will be followed by a (-).
No symbol next to a Minor statement indicates that, although there could be limited impact
associated with the change, it is indeterminate whether it will be slightly more or less.
Revision History:
November 1, 2013: Modifications to entries on:
• 2.6.2, Functional Earthing,
• 4.4.5, Protection against moving fan blades, and
• Annex Q, VDRs.
August 15, 2014:
• Update to include National Differences (ND) associated with CSA/UL 60950-1, Ed 2,
Am 2.
• Update to include special national conditions (differences) associated with CENELEC
EN 60950-1:2006/A1:2010/ A2:2013
January 16, 2015:
• Update to reflect publication of revisions to CSA/UL 60950-1, Ed. No. 2, dated
October 14, 2014.
Ver.2.5: January 16, 2015 Page 4 of 23
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Clause 0 (General Principles of Safety)
Sub-clause Discussion Impact
0.1
General Principles of Safety
Adds the term “components”
to the principle that
technologies and methods of
construction that are not
anticipated by the Standard
can be investigated if they
meet a similar level of safety
as described in the
principles.
None. Informative. See
1.5.1.
Clause 1 (General)
Sub-clause Discussion Impact
1.1.1
Equipment Covered by this
Standard
Reformats third paragraph,
and adds material that
indicates that external power
supply units and accessories
intended for use with ITE are
covered under the scope of
the Standard.
Clarification added because
there are other IEC power
supply standards that can
apply to external power
supplies and IEC TC108
wanted to make clear that
IEC 60950-1 is the
appropriate standard for
such power supplies used
with ITE.
None. Reflects present
practice.
1.1.3
Exclusions
Distribution transformers:
Clarifies that “distribution”
transformers are excluded
from the scope of IEC
60950-1.
None. Reflects present
practice.
CAN/U.S. ND Battery back-up systems:
Clarifies that battery backup
systems that are not an
integral part of Stationary
Equipment, typically
provided in separate
cabinets, are subjected to
the appropriate standard for
the battery backup systems.
Provided as the primary
reference is the standard for
Batteries for Use in Light
Electric Rail (LER)
None. Reflects present
practice.
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Clause 1 (General)
Sub-clause Discussion Impact
Applications and Stationary
Applications, UL
1973.
This National Difference was
necessary because a new
class of independent electric
energy storage systems
(EESS) are becoming
popular, often interfacing
with uninterruptible power
supplies (UPS) or distributed
energy systems (e.g., PV),
and this Standard in not
intended to cover such
equipment.
1.2.1.1
Rated Voltage
Editorially modifies the
definition of “rated voltage.”
Removes unneeded
information on three phase.
None. Editorial. Reflects
present practice.
1.5.1
Components - General
Editorially modifies general
statement about
consideration of components.
None. Editorial. Reflects
present practice.
Adds new sub-clause that
components and
subassemblies that comply
with IEC 62368-1 may be
used in equipment
investigated to this standard
without further evaluation
other than to give
consideration to the
appropriate use of the
component or subassembly
in the end product.
Added to allow the
component supply chain to
begin requesting use of IEC
62368-1 before their end
product customers select IEC
62368-1.
A similar statement is being
added to IEC 60065.
Minor (-). Since limited
components have been
certified to IEC 62368-1 to
date, limited impact.
However, very beneficial
development in the scope of
the overall longer term
transition to IEC 62368-1.
1.5.2
Evaluation and Testing of
Components
Editorial modification of the
legacy component
requirement provisions to
better clarify the intent of
IEC TC108.
Minor (-). Generally, reflects
present practice.
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Clause 1 (General)
Sub-clause Discussion Impact
1.5.6
Capacitors Bridging
Insulation
Editorially modifies
specifications for relative
humidity to better align with
the IEC style guide.
None. Editorial.
Continuing with modifications
made in Amendment 1, adds
further detail to Table 1C
and the accompanying Rules
to closer align with IEC
62368-1 and work done to
update the requirements for
capacitors. During the last
set of Amendment 1
revisions, some needed
details were left out which
made the requirements
incomplete and difficult to
apply.
Minor. Aligns with IEC
62368-1. Generally reflects
present practice, although
there could be some impact
as different practices by
different manufacturers and
NCBs are driven to closer
alignment.
1.5.7.2
Resistors Bridging Double
Insulation or Reinforced
Insulation Between the a.c.
Mains Supply and Other
Circuits
Editorially modifies
specifications for relative
humidity to better align with
the IEC style guide.
None. Editorial.
1.5.9.2
Protection of VDRs
Adds compliance criteria
related to determination as
to whether or not there is a
Limited Current Circuit.
Correlates compliance
criteria with existing
requirement.
None. Reflects present
practice.
1.5.9.4
Bridging of Basic Insulation
by VDR
Clarifies requirements for
use of VDRs and GDTs in
series that aligns with the
parallel revisions being made
to IEC 62368-1 that resulted
from some task group work
within the IEC TC108 HBSDT
(108/441/INF).
However, only addresses
VDRs and GDTs bridging
Basic Insulation. Does not
address such constructions
bridging Double or
Reinforced Insulation, which
requires further study.
Minor. Aligns with IEC
62368-1. Generally reflects
present practice, although
there could be some impact
as different practices by
different manufacturers and
NCBs are driven to closer
alignment.
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Clause 1 (General)
Sub-clause Discussion Impact
1.7
Markings and Instructions
Removes incorrect reference
to 2.1.1.8, Energy Hazards,
since there is no marking in
this sub-clause.
None. Editorial.
1.7.1.1
Power Rating Markings
Clarifies application of power
rating markings, specifically
for equipment with multiple
connections to mains,
including an example
marking format for such
markings.
Minor. Generally reflects
present practice, although
there could be some impact
as different practices by
different manufacturers and
NCBs are driven to closer
alignment.
1.7.1.3
Use of Graphical Symbols
New sub-clause, which takes
the existing last paragraph in
1.7.1.1 and moves it into its
own sub-clause.
Includes new reference to
ISO 3864-2, and states that
when symbols are used, they
should also be explained in
the user manual.
Minor (+). Generally reflects
present practice, although
there could be some impact
as different practices by
different manufacturers and
NCBs are driven to closer
alignment.
1.7.2.1
Safety Instructions and
Marking – General
CENELEC ND
In Denmark, Finland,
Norway and Sweden, for
CLASS I PLUGGABLE
EQUIPMENT
TYPE A intended for
connection to other
equipment or a network, if
safety relies on
connection to protective
earth or if surge suppressors
are connected between the
network terminals and
accessible parts, requires a
marking stating that the
equipment must be
connected to an earthed
mains socket-outlet.
Minor (+). Potentially a new
marking required for some
equipment.
1.7.5
Power Outlets on the
Equipment
CENELEC ND
In Denmark, socket-outlets
for providing power to other
equipment shall be in
accordance with the DS
60884-2-D1:2011.
Minor (+). Expected to
generally reflect present
practice.
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Clause 2 (Protection from Hazards)
Sub-clause Discussion Impact
2.2.3
Voltages under Fault
Conditions
Further modifies the
requirements for SELV
circuits to try to better
accommodate ‘hiccup’ mode
with periodic pulses, in
particular during fault
conditions.
The changes include
replacing previous references
to “120 V d.c.” with “120
Vpeak”, and replacing the
existing Figure 2E with a
more descriptive set of
figures, Figure 2E.1 and
2E.2.
These changes were made to
accommodate the bridge
between 60950-1 and
62368-1 since IEC 62368-1
treats the subject differently
and it is anticipated some of
the same interpretation
issues will be simplified/
addressed in 62368-1.
Minor. Generally reflects
present practice, although
there could be some impact
as different practices by
different manufacturers and
NCBs are driven to closer
alignment.
2.5
Limited Power Sources
In Table 2B, Limits for power
source without an OCPD, the
‘note d’ for measurement of
Isc and S are modified for
PTC devices to allow a 60s
measurement instead of 5s.
This change was added since
some of the PTC devices
used in ITE would trip too
soon under the 5s criteria,
considering the need to
accommodate Tma and the
fact that PTC devices are
temperature dependent.
Minor (-). Provides
manufacturers with a little
more flexibility selecting and
designing PTC protection into
LPS.
2.6.2
Functional Earthing
A new symbol has been
added to IEC 60417: IEC
60417-6092, Class II
equipment with functional
earthing (grounding).
It is the intent of IEC TC108
that this symbol is to (shall)
be used with equipment
Minor (+). New marking for
some equipment. Provides
manufacturers with a clearer
marking requirement for
identifying ITE with
functional earthing. Only
impacts a small number of
manufacturers.
Ver.2.5: January 16, 2015 Page 9 of 23
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Clause 2 (Protection from Hazards)
Sub-clause Discussion Impact
incorporating functional
earthing.
Key is that the traditional
double insulation symbol is
not permitted to be marked
on such equipment.
At the March 2013 meeting
of TC108, TC108 decided to
modify the wording in the
FDIS for IEC 60065 and
62368-1 to reflect the above
intent. However, since IEC
60950-1 had already passed
FDIS, the formal changes
were not allowed in it, but an
INF is planned to clarify the
current intent of IEC TC108
for IEC 60950-1.
CAN/U.S. ND As indicated above, it is the
intent of IEC TC108 that the
new symbol for functional
earthing should be provided
on such equipment
incorporating functional
earthing. The National
Difference in 2.6.2 allows for
CSA/UL 60950-1 to reflect
the IEC TC108 position, and
also aligns with the latest
versions of IEC 60065 and
IEC 62368-1.
Minor (+). New marking for
some equipment. Provides
manufacturers with a clearer
marking requirement for
identifying ITE with
functional earthing. Change
only impacts a small number
of manufacturers.
2.6.3.3
Size of Protective Bonding
Conductors
Table 2D, Minimum size of
protective bonding
conductors, has been
modified to correlate with
some work done on IEC
62368-1 to more closely
align standard values in the
table to better accommodate
both European and North
American electrical supply
systems and infrastructure.
Minor (-). Provides
manufacturers with more
flexibility designing
protective bonding systems
into global products.
Ver.2.5: January 16, 2015 Page 10 of 23
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Clause 2 (Protection from Hazards)
Sub-clause Discussion Impact
CAN/U.S. ND As described above, since
Table 2D and other parts of
sub-clause 2.6.3 have been
modified to better
accommodate North
American electrical supply
systems, several previous
NDs in the table and sub-
clause have been removed or
modified.
None. Reflects present
practice.
2.7.1
Basic Requirements
An ‘in some countries’ Note
adds China to the existing
reference to CENELEC
regarding countries/regions
that require protection per
5.3 to be incorporated into
the equipment.
None. In some countries
note. Reflects present
practice.
2.9.2
Humidity Conditioning
Editorially modifies
specifications for relative
humidity to better align with
the IEC style guide.
None. Editorial.
Adds humidity conditioning
parameters for equipment
designed for use in tropical
conditions.
Minor (+). Generally reflects
present practice due to
existing requirements in
national standards.
2.9.3
Grade of Insulation
In Table H, corrects some of
the references to conditions
that are appropriate to some
of the entries.
Minor. Generally reflects
present practice.
2.10.3.1
General
Adds an ‘in some countries’
note for China that China
considers altitude
adjustment over 2000 m.
None, for IEC. Country only
consideration.
2.10.3.3
Clearances in Primary
Circuits
Table 2L is modified, mainly
to include information on
correlation of clearances at
higher working voltages.
Minor. Generally reflects
present practice.
2.10.10
Test for Pollution Degree 1
Environment and for
Insulating Compound
Clarification that for printed
boards, it is not required to
section (slice open) the
board to determine
compliance with 2.10.5.5.
This change was championed
by UL since it was
determined to be impractical
to section printed boards.
Minor (-). Allows for a more
practical application of the
requirements for Pollution
Degree 1 for printed boards.
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Clause 2 (Protection from Hazards)
Sub-clause Discussion Impact
2.10.11
Tests for Semiconductor
Devices and for Cemented
Joints
Clarification added that for
printed boards only, it is not
required to section the board
to determine compliance.
Visual inspection, combined
with electric strength, is
adequate. This change was
championed by UL since it
was determined to be
impractical to section printed
boards.
Minor (-). Allows for a more
practical application of the
requirements for Pollution
Degree 1 for printed boards.
Clause 3 (Wiring, Connections and Supply)
Sub-clause Discussion Impact
3.2.1.1
Connection to AC Mains
Supply
CENELEC ND
In Denmark, supply cords of
single-phase equipment
having a rated current not
exceeding 13 A shall be
provided with a plug
according to DS 60884-2-D1.
CLASS I EQUIPMENT
provided with socket-outlets
with earth contacts or which
are intended to be used in
locations where protection
against indirect contact is
required according to the
wiring rules shall be provided
with a plug in accordance
with standard sheet DK 2-1a
or DK 2-5a.
If a single-phase equipment
having a RATED CURRENT
exceeding 13 A or if a
polyphase equipment is
provided with a supply cord
with a plug, this plug shall be
in accordance with the
standard sheets DK 6-1a in
DS 60884-2-D1 or EN
60309-2.
Minor. Expected to generally
reflect present practice.
3.2.5.1
AC Power Supply Cords
Editorial modification, and
clarification of requirements
for use of screened cords in
Moveable Equipment.
Minor (+). Generally reflects
present practice.
Ver.2.5: January 16, 2015 Page 12 of 23
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Clause 3 (Wiring, Connections and Supply)
Sub-clause Discussion Impact
Also adds a provision that
other cords not specified
may be used if they have
similar or better electro-
mechanical and fire safety
properties.
3.3.5
Wiring Terminal Sizes
Table 3E is reformatted, with
additional modification to
accommodate use of cords
with equipment having rated
current up to 80 A. Also,
addition of new column that
includes information on
conductor size.
Also, new ‘note c’ provides
alternative to the
requirements of this table for
accommodation of special
connectors (e.g., closed
loop) and appropriate
adjustment of terminal sizes.
Minor (-). Provides
manufacturers with more
flexibility designing terminals
for mains supply and
protective earthing
conductors.
3.4.11
Multiple Power Sources
Adds clarification anticipating
that some equipment may
not have a disconnect device
in the equipment. Therefore,
the marking requiring
instructions on how to
remove all power from the
equipment is to be located
close to the mains input
terminals. Also, see 1.7.1.1.
Minor. Generally reflects
present practice.
Clause 4 (Physical Requirements)
Sub-clause Discussion Impact
4.1
Stability
Provides an additional
compliance option for the
application of the 10 degree
tilt test, which is allowed
now in IEC 62368-1 and that
better accommodates some
modern configurations of ITE
Minor (-). Provides
manufacturers with more
flexibility designing and
testing equipment for
compliance with the 10
degree tilt test.
4.2.11
Rotating Solid Media
Although not indicated in the
Amendment, the August
2012 Corrigendum 1 for
Amendment No. 1 of IEC
60950-1, Edition 2 removed
sub-clause 4.2.11 from
None. The sub-clause
already has been removed
from Amendment No. 1,
although it might not be
obvious unless one is aware
of the August 2012
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Clause 4 (Physical Requirements)
Sub-clause Discussion Impact
Amendment 1. Therefore, it
also is no longer in
Amendment No. 2.
Corrigendum.
4.3.8
Batteries
IEC TC108 made a
commitment to the IECEE to
add a reference to IEC 62133
once the Standard was
revised (Edition 2) to
incorporate some needed
changes. As a result, there
now is a reference in 60950-
1 to IEC 62133 for portable
secondary sealed cells and
batteries (other than button)
containing alkaline or other
non-acid electrolyte, which
includes Lithium-Ion.
Additionally, the first
paragraph was editorially
revised, and the first
compliance criteria for
overcharging of a
rechargeable battery was
modified to reflect some of
the work done on IEC
62368-1 to make a more
realistic test condition.
Considerable (+). Although
the other changes are
relatively minor, the addition
of the requirement that
portable secondary sealed
cells and batteries need to
comply with IEC 62133 could
have some considerable
impact on manufacturers
who in the past used IEC
60950-1 alone for such
batteries and battery packs.
In the U.S. and Canada,
since for a number of years
there has been a National
Difference requiring UL 2054
for most of these same types
of batteries, and since UL
2054 and IEC 62133 while
not harmonized have a
number of common features,
the impact on manufacturers
likely will be less.
CAN/U.S. ND Battery Packs
(transportable
equipment): An existing
National Difference in Annex
P.1 for secondary
rechargeable batteries in
transportable equipment
references UL 2054.
However, Amendment 2 of
IEC 60950-1 Ed 2 now
references IEC 62133, Ed 2
for the same batteries.
For the transition to IEC
62133 in IEC 62368-1, the
addition of IEC 62133 was
combined with
expansion of the
performance requirements
for battery packs in Annex M.
However, for IEC 60950-1,
Ed 2, Am 2, the
Minor. Since UL 2054 is
presently required, and
remains an option, there is
no impact on secondary
battery packs used in
transportable equipment
maintaining use of UL 2054
for such battery packs.
For manufacturers
transitioning to IEC 62133,
there may be some minor
impact (+) since it involves
determining compliance with
another standard (IEC
62133) and Annex M of IEC
62368-1.
Ver.2.5: January 16, 2015 Page 14 of 23
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Clause 4 (Physical Requirements)
Sub-clause Discussion Impact
requirements in 4.3.8 were
not significantly expanded to
cover the additional aspects
in Annex M of IEC 62368-1.
Since UL 2054 has proven
effective in CSA/UL 60950-1
for many years, for
transitional purposes until UL
62368-1 is fully
implemented, battery packs
used in transportable
applications are required to
comply with either, (a) the
UL 2054 component
requirement (Annex P.1), or
(b) IEC 62133 combined with
the additional requirements
from Annex M of IEC 62368-
1. This will allow for a better
transition to IEC 62133 for
battery packs during the
60950-1 to 62368-1
transition.
CAN/U.S. ND Battery Packs (stationary
equipment): For stationary
applications, internationally
IEC TC21/SC21A continues
work on IEC 62619, Safety
requirements for secondary
lithium cells and batteries for
use in industrial applications.
IEC 62619 will cover battery
packs and subsystems for
stationary applications, with
IEC 62133 still covering
portable applications.
However, IEC 62619 likely
will not be published for 2-3
more years.
In the U.S., for stationary
applications the standard, UL
1973, Batteries for Use in
Light Electric Rail (LER)
Applications and Stationary
Applications, often is being
used to consider the safety
of larger and more complex
and powerful electric energy
storage systems (EESS).
Efforts are beginning to
Minor (+). Large battery
packs with Lithium Ion and
other modern chemistries
have not been used
frequently in stationary
applications until relatively
recently. While compliance
with a battery safety
standard technically is a new
requirement under 60950-1,
allowing three options until
IEC 62619 is published is not
considered likely to be a
significant impact on the
present design of such
battery packs for use in
stationary applications.
Ver.2.5: January 16, 2015 Page 15 of 23
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Clause 4 (Physical Requirements)
Sub-clause Discussion Impact
make it a bi-national
standard for both Canada
and the U.S., and longer
term, there is an intent to
make UL 1973 and IEC
62619 harmonized.
However, in the interim,
battery packs with secondary
sealed cells and batteries
containing alkaline or other
non-acid electrolyte and
used in Stationary
Equipment have the option
to comply with either IEC
62133, UL 2054 or UL 1973.
CAN/U.S. ND Insulation in Battery
Packs:
Both IEC 62133 and UL 2054
do not contain detailed
requirements for
electrical insulation. As
lithium-ion and other more
complex battery subsystems
are incorporated into
stationary equipment, there
is increased likelihood they
may incorporate Hazardous
Voltages, thus will require
application of appropriate
insulation requirements
when the insulation is used
as a safeguard.
A requirement has been
added to make clear that
appropriate requirements
from sub-clause 2.10
(Clearances, creepage
distances and distances
through insulation) should be
applied to such safeguards in
battery packs when a battery
standard does not have such
requirements.
Minor (+). Generally reflects
present practice for battery
packs utilizing Hazardous
Voltages.
4.4.5
Protection Against Moving
Fan Blades
Sub-clause 4.5.5 has been
restructured and rewritten to
more clearly cover the fan
blade requirements that
were added to IEC 60950-1
Minor (-). Modifications
should promote intended
application.
Ver.2.5: January 16, 2015 Page 16 of 23
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Clause 4 (Physical Requirements)
Sub-clause Discussion Impact
in Amendment No. 1 of
Edition No. 2. There were
some unintended
implications related to how
the requirements were being
applied, so additional
clarifications were needed.
4.7.3.4
Materials for Components
and other Parts Inside Fire
Enclosures
Since existing Annex Q for
VDRs references IEC 61051-
2 and since Annex Q now
has VDR flammability
requirements, a reference to
Annex Q has been added in
4.7.3.4.
None. Editorial.
Clause 5 (Electrical Requirements and Simulated Abnormal Conditions)
Sub-clause Discussion Impact
5.2.2
Test Procedure
Table 5C has been revised to
provide more realistic test
voltages for Reinforced
Insulation
Minor (-). Since Table 5C
now allows for smaller test
voltages for some Reinforced
Insulation, manufacturers will
be able to design accordingly.
Clause 6 (Connection to Telecommunication Networks)
Sub-clause Discussion Impact
6.2.2
Electric Strength Test
Procedure
Editorial modification of in
some country note for
Australia.
None. Informative note.
Clause 7 (Connection to Cable Distribution Systems)
Sub-clause Discussion Impact
7.4.1
General
Now allows for similar
protection of TNV-1 circuits
in 7.4.1 as is currently
allowed in 7.3, and therefore
such circuits do not need to
be subjected to voltage
surge test in 7.4.2 or
impulse test in 7.4.3.
Mainly, for the exception to
apply, the circuit must be
Considerable (-). Provides
additional design options for
equipment connected to the
cable distribution network
and involving SELV voltage
levels and that are intended
to be earthed on the
secondary side.
Ver.2.5: January 16, 2015 Page 17 of 23
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Clause 7 (Connection to Cable Distribution Systems)
Sub-clause Discussion Impact
TNV-1, the earthed side of
the circuit must be
connected to the coaxial
cable screen, and the
installation instructions
require the coaxial cable to
be connected to the building
installation.
7.4.3
Impulse Test
For equipment required to
be tested, the 4kV impulse
test is not required if the
electrical separation already
has been tested at 3 kV or
4.242 KV peak or d.c. in
accordance with 5.2.2.
The testing per 5.2.2 is
considered representative of
the testing per 7.4.3 and the
statement reduces
redundant testing.
Minor (-). Provides for
reduced testing of circuits
that are already required to
be tested by other
requirements in the
Standard.
Annexes
Discussion Impact
Annex B
Motor Tests Under
Abnormal Conditions
B.7.2
Test Procedure
Since the requirements in
B.7.2 are for a secondary
motor, compliance criteria
also now permits either a
winding to open or the
permanent de-energization
to terminate testing
Also, editorially modifies
sub-clause to split
requirement and compliance
criteria.
Minor (-). Generally reflects
present practice.
B.7.3
Alternate Test Procedure
Since the requirements in
B.7.3 are for a secondary
motor, also permits either a
winding to open or the
permanent de-energization
to terminate testing.
Minor (-). Generally reflects
present practice.
Ver.2.5: January 16, 2015 Page 18 of 23
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Annexes
Discussion Impact
Annex D
Measuring Instruments
for Touch-Current Tests
D.1
Measuring Instrument
For Figure D.1, revises lower
end of frequency range
specification for the
measurement meter from 15
Hz to 20 Hz. This was done
for accreditation purposes
and to be more aligned with
IEC 60990.
Minor. Most equipment is
expected to continue to
comply.
Annex F
Measurement of
Clearances and Creepage
Distances
Provides some additional
clarification on Figure F.8,
Narrow recess, and Figure
F.9, Wide recess, in
particular intended
application of both
clearances and creepage
distances. Clearances were
missing previously
None. Editorial.
Annex P
Normative References
Editorially modifies the
existing introductory
material to better explain the
intent of the Annex, in
particular that the standards
only apply as referenced in
the body of the Standard.
They are not intended to be
general references for
certification purposes.
Also includes specific
standards, or updated
standards, now references in
Am 2 that may not have
been referenced before, such
as IEC 62133 for batteries.
None. Introduction provides
intent of the Annex and
new/updated standards are
part of requirements in the
body of the Standard.
Annex P.1
UL and CSA Component
Requirements
(mandatory)
(3.2.1.2, 3.2.4, 3.2.5.2)
DC Rated Attachment Plugs
Annex P.1 has been updated
to include a reference to the
recently published, SU 2695
Minor (+). Requirement only
impacts a small number of
manufacturers.
Ver.2.5: January 16, 2015 Page 19 of 23
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Annexes
Discussion Impact
CAN/U.S. ND Outline for DC Rated
Attachment Plugs and Outlet
Devices Intended for Use
with Information Technology
and Telecommunications
Equipment Installed in
Restricted Access
Locations.
(4.3.6, 3.2.5)
Direct Plug-in units
CAN/U.S. ND
The requirements for use of
mounting tabs on direct
plug-in units/ equipment
(DPIU) differ in Canada and
the U.S.
Sub-clause 7.15 of UL 1310
limits the use of a mounting
tab to applications that
certain specified conditions
are met. A marking
requirement (7.15 (d) and
52.4) addresses the
concerns with a mounting
tab and the potential ‘risk of
electric shock’ associated
with the ordinary person
(user) removing the
receptacle cover screw.
CSA C22.2 No. 223 has a
more conservative
requirement that restricts
use of mounting tabs for
general use power supplies
investigated to it. The CSA
223 requirement is based on
an interpretation of the
Canadian Electrical Code.
Therefore, for ITE
applications, and so
manufacturers can ship
single systems of equipment
(e.g., DPIU and Class III
device) to both Canada and
the U.S., a modified
requirement permits
manufacturers to take into
consideration the installation
requirements in both Canada
and the U.S. without having
to provide separate
Minor (+). Requirement only
impacts a small number of
manufactures. Although
manufacturers will be
required to provide an
additional marking, the
added provision will permit
single systems (equipment
and DPIU) to be shipped into
Canada and the U.S.
See associated marking in
NAA (4.3.6, 3.2.5).
Ver.2.5: January 16, 2015 Page 20 of 23
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Annexes
Discussion Impact
DPIUs/systems for each
country.
Annex P.2
UL and CSA Component
Requirements
(Alternative)
CAN/U.S. ND
Several updates to
referenced standards have
been made to Annex P.2.
None. Editorial.
Annex Q
Voltage Dependent
Resistors (VDRs)
Although the existing Annex
Q references IEC 61051-2 for
VDRs, there is some
information missing that is
needed to determine
whether the VDR meets
specifically an ITE
application. As part of the
work on IEC 62368-1 this
additional detail has been
identified and added to
Edition No. 2 of IEC 62368-
1, so now it is being added
to IEC 60950-1 to allow for
more effective use of Annex
Q.
Includes new requirement
that VDR case/enclosure
needs to comply with IEC
60695-11-5 Needle Flame or
V-1.
Considerable (+). Because
the previous Annex Q was
lacking detail, there may be
some impact on
manufacturers who may
have previously specified
VDRs that do not meet the
updated criteria. It is likely
that manufacturers will be
able to specify VDRs that
meet these criteria, but there
remains some uncertainty on
true impact at this time,
including the provision for
flammability of the VDR
body.
Annex U
Insulated Winding Wires
for Use without
Interleaved Insulation
Multi-layer winding wires for
use in transformers without
interleaved insulation are
decreasing in diameter, and
now include round wires with
diameters down to 0.01 mm,
stranded, solid square and
solid rectangular with cross-
sectional areas down to
0.000079 mm2. As a result,
Annex U needed modification
to include appropriate
requirements and references
Minor (-). Provides
manufacturers with more
flexibility designing and
testing multi-layer winding
wire for compliance with
Annex U.
Ver.2.5: January 16, 2015 Page 21 of 23
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Annexes
Discussion Impact
to appropriate component
standards for such
construction. The entire
Annex U has been rewritten
to accomplish this.
Annex Y
Ultraviolet Light
Conditioning Test
Editorially modifies
specifications for relative
humidity to better align with
the IEC style guide.
None. Editorial.
Annex CC
Evaluation of Integrated
Circuit (IC) Current
Limiters
- -
CC.1
Integrated Circuit (IC)
Current Limiters
As an implementation of sub-
clause 2.5 and LPS, the
current limit is stipulated to
be 5 A after each of the test
conditions (in CC.2, CC.3 or
CC.4).
The requirement now also
stipulates a different sample
may be used for each test.
Minor (+). Although the
existing CC.1 indicates the
manufacturer’s specified
value is limited to 5 A under
normal operating conditions,
this limit also now is
stipulated for conditioning
tests.
CC.2
Test Program 1
Several adjustments have
been made to the circuit
parameters.
Minor. The changes are not
expected to impact the
ability of components to
comply with the
requirements.
CC.3
Test Program 2
Provides clarification on the
fuse used to comply with the
test.
Minor. The changes are not
expected to impact the
ability of components to
comply with the
requirements.
CC.4
Test Program 3
IEC 62368-1 allows for a
third test program for
qualifying IC Current
Limiters, which actually is a
combination of the existing
test programs 1 and 2. To
allow for transition from IEC
60950-1 to IEC 62368-1, it
now also has been added to
Annex CC.
Minor (-). Allows
manufacturers more options
designing, testing and
selecting IC Current Limiters.
CC.5
Compliance
Since it was originally
missing, common compliance
criteria has been added that
is applicable to all three test
Minor (+). The changes are
not expected to impact the
ability of components to
comply with the
Ver.2.5: January 16, 2015 Page 22 of 23
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Annexes
Discussion Impact
programs.
requirements.
Annex NAE
U.S. and Canadian
Regulatory Requirements
1.1.2
Baby Monitors
CAN/U.S. ND
In the U.S. ASTM F2951,
Consumer Safety
Specification for Baby
Monitors, has been published
since the last Amendment.
The purpose of the
specification is to help avoid
strangulation hazards
associated with baby
monitors when the
equipment is mounted close
to the child. The associated
requirements, primarily,
instructional safeguards
/markings, are applicable to
baby monitors investigated
to the Standard.
Minor (+). Generally reflects
present practice when baby
monitors are submitted for
investigation to this
standard. Only impacts a
very limited amount of
equipment.
1.1.3
Modular Data Centers
CAN/U.S. ND
Specifies that Modular Data
Centers (MDC) shall comply
with Article 646, Modular
Data Centers, of the National
Electrical Code, ANSI/NFPA
70, as covered in UL Subject
2755, Outline of
Investigation for Modular
Data Centers.
Minor. Redirects such
equipment to the more
appropriate standard.
2.6
Isolated Ground Receptacles
CAN/U.S. ND
Occasionally, Isolated
Ground Receptacles are
incorporated into ITE for
special purpose installations.
Clarifies, that when
incorporated into the
equipment, Isolated Ground
Receptacles are required to
be of a type identified for the
purpose (orange triangle
marked on the face of the
receptacle) and are required
to be installed in accordance
with the Grounding and
Bonding requirements in
Section 250.146(D),
Isolated Receptacles, of
NFPA 70 (NEC).
Minor (+). Reflects general
practice by nature of Clause
1 already requiring
equipment investigated to UL
60950-1 to be compatible
with the NEC.
Ver.2.5: January 16, 2015 Page 23 of 23
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Annexes
Discussion Impact
Also, clarifies, that metal
parts of the equipment shall
be separately protectively
earthed in accordance with
2.6, including use of
appropriate identification
symbols as required.
4.7.3.1
Equipment for use in spaces
used for environmental air
(plenums)
CAN/U.S. ND
Editorially modifies the
requirements for equipment
used in spaces used for
environmental air, which the
NEC now classifies as a
plenum. See NAA (4.7.3.1)
for sample marking
Minor (+). An editorial
modification, but marking
may need to incorporate
slight modifications to reflect
the updated terminology. .