Amendment 2 - Information technology equipment - Safety - Part 1: General requirements

Amendement 2 - Matériels de traitement de l'information - Sécurité - Partie 1: Exigences générales

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Publication Date
27-May-2013
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IEC 60950-1:2005/AMD2:2013 - Amendment 2 - Information technology equipment - Safety - Part 1: General requirements
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IEC 60950-1
Edition 2.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Information technology equipment – Safety –
Part 1: General requirements
Matériels de traitement de l'information – Sécurité –
Partie 1: Exigences générales
IEC 60950-1:2005/A2:2013
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60950-1
Edition 2.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Information technology equipment – Safety –
Part 1: General requirements
Matériels de traitement de l'information – Sécurité –
Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 35.020; 35.260 ISBN 978-2-83220-741-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60950-1 Amend.2 © IEC:2013
FOREWORD

This amendment has been prepared by IEC technical committee 108: Safety of electronic

equipment within the field of audio/video, information technology and communication

technology.
The text of this amendment is based on the following documents:
FDIS Report on voting
108/507/FDIS 108/510/RVD

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC web site under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
____________
0.1 General principles of safety

Replace, in the existing second paragraph, the words "technologies and materials" by

"technologies, components and materials".
Add, between the existing second and third paragraphs, the following new note:

NOTE The need for additional detailed requirements to cope with a new situation should be brought promptly to

the attention of the appropriate committee.
1.1.1 Equipment covered by this standard
Replace the existing third paragraph by the following new paragraph:
This part of IEC 60950 is also applicable to:

– components and subassemblies intended for incorporation in this equipment. Such

components and subassemblies need not comply with every requirement of the standard,

provided that the complete equipment, incorporating such components and
subassemblies, does comply;

– external power supply units intended to supply other equipment within the scope of this

part of IEC 60950;

– accessories intended to be used with equipment within the scope of this part of

IEC 60950.

Replace, in the existing NOTE 1, the words "components and subassemblies" by "components,

subassemblies and accessories".
---------------------- Page: 4 ----------------------
60950-1 Amend.2 © IEC:2013 – 3 –
1.1.3 Exclusions

Replace in the existing first dash "and transformers;" by "and distribution transformers;"

1.2.1.1
RATED VOLTAGE
Replace the existing definition by the following new definition:

supply voltage from which the equipment is to be operated as declared by the manufacturer

1.5.1 General
Replace the existing text and notes of this subclause by the following new text:

Where safety is involved, components shall comply with the requirements of this standard or,

where specified in a requirements clause, with the safety aspects of the relevant IEC

component standards.

NOTE An IEC component standard is considered relevant only if the component in question clearly falls within its

scope.

Components and subassemblies that comply with IEC 62368-1 are acceptable as part of an

equipment covered by this standard without further evaluation other than to give consideration

to the appropriate use of the component or subassembly in the end-product.
1.5.2 Evaluation and testing of components
Replace the existing text and note of this subclause by the following new text:

Where use of an IEC component standard is permitted above, evaluation and testing of

components shall be conducted as follows:

– a component shall be checked for correct application and use in accordance with its

rating;

– a component that has been demonstrated to comply with a standard harmonized with the

relevant IEC component standard shall be subjected to the applicable tests of this

standard, as part of the equipment, with the exception of those tests that are part of the

relevant IEC component standard;

– a component that has not been demonstrated to comply with a relevant standard as above

shall be subjected to the applicable tests of this standard, as part of the equipment, and to

the applicable tests of the component standard, under the conditions occurring in the

equipment;

NOTE The applicable test for compliance with a component standard is, in general, conducted separately.

– where components are used in circuits not in accordance with their specified ratings, the

components shall be tested under the conditions occurring in the equipment. The number

of samples required for test is, in general, the same as required by an equivalent

standard.
Compliance is checked by inspection and by the relevant data or tests.
1.5.6 Capacitors bridging insulation
Replace the existing second dash of this subclause by the following new dash:
– Humidity: (93 ± 3) % relative humidity;
---------------------- Page: 5 ----------------------
– 4 – 60950-1 Amend.2 © IEC:2013
Table 1C – Capacitor ratings according to IEC 60384-14

Replace, in the existing Table 1C modified by Amendment 1, the first six rows by the

following:
TYPE TEST TYPE TEST r.m.s.
RATED VOLTAGE of the
Capacitor subclass according to impulse voltage of voltage of the
capacitor
IEC 60384-14 the capacitor capacitor
V r.m.s.
kV peak kV r.m.s.
Y1 Up to and including 500 8 4
Over 150 up to and
Y2 5 1,5
including 300
Y4 Up to and including 150 2,5 0,9
X1 Up to and including 760 4 -
X2 Up to and including 760 2,5 -

Replace the existing Rule 2 of Table 1C modified by Amendment 1 by the following:

2 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION, SUPPLEMENTARY INSULATION or

REINFORCED INSULATION, the voltage rating of the single capacitor shall be at least equal to the RMS WORKING

VOLTAGE across the insulation being bridged, determined according to 2.10.2.2.

Replace the existing Rule 3 of Table 1C modified by Amendment 1 by the following:

3 For a single capacitor bridging FUNCTIONAL INSULATION, BASIC INSULATION or SUPPLEMENTARY INSULATION,

– the TYPE TEST impulse test voltage of the single capacitor shall be not less than the peak value of the test

voltage (not the r.m.s. voltage) of Table 5B for BASIC INSULATION, or the peak value of the test voltage of

Table 5C for BASIC INSULATION, as applicable;

– the TYPE TEST r.m.s. voltages of the single capacitor shall be not less than the required r.m.s. test voltage

of Table 5B for BASIC INSULATION, or the equivalent r.m.s. test voltage (not the peak voltage) of Table 5C

for BASIC INSULATION, as applicable.

Replace the existing Rule 4 of Table 1C modified by Amendment 1 by the following:

4 For a single capacitor bridging DOUBLE INSULATION or REINFORCED INSULATION,

– the TYPE TEST impulse voltage of the single capacitor shall be not less than the peak value of the test

voltage (not the r.m.s. voltage) of Table 5B for REINFORCED INSULATION, or the peak value of the test

voltage of Table 5C for REINFORCED INSULATION, as applicable;

– the TYPE TEST r.m.s. voltage of the single capacitors shall be not less than the required r.m.s. test voltage

of Table 5B for REINFORCED INSULATION, or the equivalent r.m.s. test voltage (not the peak voltage) of

Table 5C for REINFORCED INSULATION, as applicable;

Replace the existing Rule 7 of Table 1C modified by Amendment 1 by the following:

7 If two or more capacitors are used in series, all of the following apply:

– under single fault conditions, the voltage on each of the remaining individual capacitors shall not exceed

the voltage rating of the relevant individual capacitor;

– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the TYPE TEST peak impulse test voltages

of all capacitors shall be not less than the peak value of the test voltage (not the r.m.s. voltage) of Table

5B, or the peak value of the test voltage of Table 5C, as applicable;

– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the TYPE TEST r.m.s. test voltages of all

capacitors shall be not less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test

voltage (not the peak voltage) of Table 5C, as applicable;

– for REINFORCED INSULATION, the sum of the TYPE TEST peak impulse test voltages of all capacitors shall be

not less than the peak value of the test voltage (not the r.m.s. voltage) of Table 5B, or the peak value of

the test voltage of Table 5C, as applicable;

– for REINFORCED INSULATION, the sum of the TYPE TEST r.m.s. test voltages of all capacitors shall be not

less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test voltage (not the peak

voltage) of Table 5C, as applicable;
– they shall comply with the other rules above.
---------------------- Page: 6 ----------------------
60950-1 Amend.2 © IEC:2013 – 5 –
Table 1D – Informative examples of application of capacitors

Replace, in the existing Table 1D modified by Amendment 1, the value “1” by “-” in the

following rows as shown:
150 III 2,5 F X2 - 1
250 III 4,0 F X1 - 1

1.5.7.2 Resistors bridging double insulation or reinforced insulation between the a.c.

mains supply and other circuits
Replace, in the existing second dash, the value “93 % ± 3 %” by “(93 ± 3) %”.
1.5.9.2 Protection of VDRs

Replace the last existing sentence of this subclause by the following new sentence:

Compliance is checked by inspection and, if necessary to determine that the circuit is a

LIMITED CURRENT CIRCUIT, by measurement and test.
1.5.9.4 Bridging of basic insulation by a VDR

Replace the first existing paragraph of this subclause by the following new paragraph:

It is permitted to bridge BASIC INSULATION by a VDR complying with the requirements of

Annex Q, with or without a GDT in series, provided that one side of the circuit is earthed in

accordance with 2.6.1 a).

Replace the last existing paragraph of this subclause, added by Amendment 1, and the

compliance statement by the following new text:

For all other equipment, it is permitted to bridge BASIC INSULATION by a VDR in series with a

GDT provided that:
– the VDR complies with the requirements of Annex Q; and
– the GDT complies with:
• the electric strength test for BASIC INSULATION; and

• the external CLEARANCE and CREEPAGE DISTANCE requirements for BASIC INSULATION.

Compliance is checked by inspection and, if necessary, by measurement and test.
1.7 Markings and instructions
Delete the existing reference to “2.1.1.8 Energy hazards”.
1.7.1.1 Power rating markings

Replace the existing second paragraph, added by Amendment 1, by the following two new

paragraphs:

If the equipment is not provided with a means for direct connection to a MAINS SUPPLY, it need

not be marked with any electrical rating, such as its RATED VOLTAGE, RATED CURRENT or RATED

FREQUENCY.

If the equipment, or a system, has multiple MAINS SUPPLY connections, each individual MAINS

SUPPLY electrical rating must be marked, unless they are the same, but the overall equipment

---------------------- Page: 7 ----------------------
– 6 – 60950-1 Amend.2 © IEC:2013

or system electrical rating need not be marked. If the multiple MAINS SUPPLY are identical, it is

permitted to mark them, for example, as “MAINS SUPPLY electrical rating x N” where N is the

number of identical MAINS SUPPLY connections.
1.7.1.2 Identification markings

Add, after the existing subclause added by Amendment 1, the following new subclause:

1.7.1.3 Use of graphical symbols

Graphical symbols placed on the equipment, whether required by this standard or not, shall

be in accordance with IEC 60417 or ISO 3864-2 or ISO 7000, if available. In the absence of

suitable symbols, the manufacturer may design specific graphical symbols.
Symbols placed on the equipment shall be explained in the user manual.
2.2.3 Voltages under fault conditions

Replace, in the existing first paragraph of this subclause, the existing words "Figure 2E" by

"Figure 2E.1 and Figure 2E.2" (two instances).

Replace in the existing first paragraph of this subclause the value “120 V d.c” by “120 V ”.

peak

Replace the existing third paragraph starting with “Only one pulse .." by the following new

text:

A limit of 120 V applies if the pulse goes above V only once during time t , for example

peak 1 1
see Figure 2E.1.

A limit of 71 V applies if the pulse goes above V more than once during time t , for

peak 1 1
example see Figure 2E.2.
Figure 2E – Voltages in SELV circuits under single fault conditions
Replace the existing Figure 2E by the following new Figures 2E.1 and 2E.2:
t t
1 2
V 120 V
2 peak
0 V
IEC 710/13
Figure 2E.1 – Voltages in SELV circuits under single
fault conditions for a single pulse above V1
---------------------- Page: 8 ----------------------
60950-1 Amend.2 © IEC:2013 – 7 –
t t
1 2
V 71 V
2 peak
0 V
IEC 711/13
Figure 2E.2 – Voltages in SELV circuits under single
fault conditions for multiple pulses above V1
Table 2B – Limits for power sources without an overcurrent protective device
Replace the existing footnote d of this table by the following new footnote:

Measurement of I and S are made 5 s after application of the load if protection is by an electronic circuit and

60 s for a positive temperature coefficient device or in other cases.
2.6.2 Functional earthing

Delete the existing last dashed item of this subclause, including the bulleted items of this

dash.

Add, before the existing last sentence of this subclause, the following new text:

For equipment having a power supply cord where a conductor with green-and-yellow
insulation is used only to provide a FUNCTIONAL EARTHING connection:

– the equipment shall not be marked with the symbol , IEC 60417-5172 (2003-02); and

– the equipment may be marked with:
• the symbol , IEC 60417-5018 (2011-07); or
• the symbol , IEC 60417-6092 (2011-10).
These symbols shall not be used for CLASS I EQUIPMENT.

There are no requirements other than those in 3.1.9 regarding the termination of this

FUNCTIONAL EARTHING conductor at the equipment end.
Table 2D – Minimum size of protective bonding conductors
Replace the value “16” in the first column, first row by “20”.
2.7.1 Basic requirements
Replace in the existing note the word “CENELEC” by “CENELEC and in China”.
---------------------- Page: 9 ----------------------
– 8 – 60950-1 Amend.2 © IEC:2013
2.9.2 Humidity conditioning

Replace in the existing first paragraph, modified in Amendment 1, the value “2 K” by “± 2 °C”.

Replace the existing second paragraph by the following two new paragraphs:

For equipment designated for use in tropical conditions, the time duration shall be 120 h at a

temperature of (40 ± 2) °C and a relative humidity of (93 ± 3) %.

With the concurrence of the manufacturer, it is permitted to increase the time durations.

Table 2H – Examples of application of insulation

Replace the existing row for BASIC, TNV-2 CIRCUIT of this table by the following new row:

d e
TNV-2 CIRCUIT – unearthed TNV-1 CIRCUIT B12
d f
– earthed TNV-1 CIRCUIT B13
– TNV-3 CIRCUIT B14

Replace the existing row for SUPPLEMENTARY, TNV CIRCUIT of this table by the following new

row:
TNV CIRCUIT – basic-insulated conductive part S2
– ELV CIRCUIT S2
Figure 2H – Examples of application of insulation

Replace the existing figure, including the note, by the following new note and figure:

---------------------- Page: 10 ----------------------
60950-1 Amend.2 © IEC:2013 – 9 –
Similar circuit or
conductive part
PRIMARY CIRCUIT
R B
Unearthed
HAZARDOUS VOLTAGE
SECONDARY CIRCUIT B4
S/R B
Earthed
HAZARDOUS VOLTAGE
SECONDARY CIRCUIT
B3 B6 B6
ELV CIRCUIT or
basic-insulated
conductive part
R1 R3 S/R1 S1
Unearthed SELV CIRCUIT
or double-insulated
conductive part
B6 B F
B2 B5 B5 F3 F1
Earthed SELV CIRCUIT
F11
B F
R2 R4 S/R2 S2
B7 F12
Unearthed TNV-1 CIRCUIT
f) f)
R2 R4 S/R2 S2
F10 F13
Earthed TNV-1 CIRCUIT
d) f) d) d) d) e)
R2 R4 S/R2 S2
B8 B10 B12
B13
TNV-2 CIRCUIT
d) f) d) e) d) e)
R2 R4 S/R2 S2 B13 B14 B9 B11 B12
TNV-3 CIRCUIT
F: FUNCTIONAL INSULATION B: BASIC INSULATION
S: SUPPLEMENTARY INSULATION S/R: see Footnote c in Table 2H
R: REINFORCED INSULATION
IEC 712/13

NOTE The references b), c), d), e) and f) refer to the corresponding footnotes in Table 2H.

2.10.3.1 General

Add, after the existing Note 1, the following new note and renumber the subsequent notes

accordingly:

NOTE 2 China has special requirements in choosing multiplication factors at altitudes above 2 000 m.

Table 2L – Additional clearances in primary circuits
Replace the existing table, modified by Amendment 1, by the following new table:
---------------------- Page: 11 ----------------------
– 10 – 60950-1 Amend.2 © IEC:2013
CLEARANCES in mm
MAINS TRANSIENT VOLTAGE
c c
1 500 V 2 500 V
a a

Pollution Pollution FUNCTIONAL REINFORCED Pollution degrees FUNCTIONAL REINFORCED

Degrees Degree 3 BASIC or INSULATION 1, 2 and 3 BASIC or INSULATION
1 and 2 SUPPLEMENTARY SUPPLEMENTARY
INSULATION INSULATION
PEAK WORKING PEAK WORKING
VOLTAGE VOLTAGE
up to and up to and
including including
V V
210 (210) 210 (210) 0,0 0,0 420 (420) 0,0 0,0
298 (288) 294 (293) 0,1 0,2 493 (497) 0,1 0,2
386 (366) 379 (376) 0,2 0,4 567 (575) 0,2 0,4
474 (444) 463 (459) 0,3 0,6 640 (652) 0,3 0,6
562 (522) 547 (541) 0,4 0,8 713 (729)
0,4 0,8
650 (600) 632 (624) 0,5 1,0 787 (807) 0,5 1,0
738 (678) 715 (707) 0,6 1,2 860 (884) 0,6 1,2
826 (756) 800 (790) 0,7 1,4 933 (961) 0,7 1,4
914 (839) 885 (873) 0,8 1,6 1 006 (1 039) 0,8 1,6
1 002 (912) 970 (956) 0,9
1,8 1 080 (1 116) 0,9 1,8
1 090 (990)
1 055 (1 039) 1,0 2,0 1 153 (1 193) 1,0 2,0
1 178 (1 068) 1 140 (1 122) 1,1 2,2 1 226 (1 271) 1,1 2,2
1 266 (1 146) 1 225 (1 205) 1,2 2,4 1 300 (1 348) 1,2 2,4
1 354 (1 224) 1 310 (1 288) 1,3 2,6 1 374 (1 425) 1,3 2,6
The additional CLEARANCES in the table apply if required by 2.10.3.3 b).
The values in parentheses shall be used:
– if the values in parentheses in Table 2K are used; and
– for FUNCTIONAL INSULATION if required by 5.3.4 a).

For voltage values above the PEAK WORKING VOLTAGE values given in the table, linear extrapolation is permitted.

For voltage values within the PEAK WORKING voltage values given in the table, linear interpolation is permitted

between the nearest two points, the calculated minimum additional CLEARANCE being rounded up to the next higher

0,1 mm increment.

There is no minimum CLEARANCE for FUNCTIONAL INSULATION unless it is required by 5.3.4 a). See 2.10.1.3.

It is not required to pass the tests of 2.10.10 for Pollution Degree 1.

The relationship between MAINS TRANSIENT VOLTAGE and AC MAINS SUPPLY voltage is given in Table 2J.

2.10.10 Test for Pollution Degree 1 environment and for insulating compound
Replace the existing last paragraph of this subclause by the following new text:

For other than printed boards, compliance is checked by inspection of the cross-sectional

area, and there shall be no visible voids, gaps or cracks in the insulating material.

In the case of insulation between conductors on the same inner surface of printed boards and

the insulation between conductors on different surfaces of multilayer printed boards,

compliance is checked by external visual inspection. There shall be no delamination which

affects the pollution degree.
---------------------- Page: 12 ----------------------
60950-1 Amend.2 © IEC:2013 – 11 –
2.10.11 Tests for semiconductor devices and for cemented joints
Replace the existing last paragraph of this subclause by the following new text:
Compliance is checked by inspection and measurement.

Except for cemented joints on the same inner surface of a printed board, compliance is

checked by inspection of the cross-sectional area, and there shall be no visible voids, gaps or

cracks in the insulating material.

In the case of insulation between conductors on the same inner surface of printed boards and

the insulation between conductors on different surfaces of multilayer boards, compliance is

checked by measurement and external visual inspection. There shall be no delamination.

3.2.5.1 AC power supply cords

Replace the entire existing text of this subclause, except for Table 3B, by the following new

text:

A MAINS SUPPLY cord shall be of the sheathed type and comply with the following as

appropriate:

– if rubber sheathed, be of synthetic rubber and not lighter than ordinary tough rubber-

sheathed flexible cord according to IEC 60245-1 (designation 60245 IEC 53);
– if PVC sheathed:

• for equipment provided with a NON-DETACHABLE POWER SUPPLY CORD and having a mass

not exceeding 3 kg, be not lighter than light PVC sheathed flexible cord according to

IEC 60227-1:2007 (designation 60227 IEC 52);

• for equipment provided with a NON-DETACHABLE POWER SUPPLY CORD and having a mass

exceeding 3 kg, be not lighter than ordinary PVC sheathed flexible cord according to

IEC 60227-1:2007 (designation 60227 IEC 53);

NOTE 1 There is no limit on the mass of the equipment if the equipment is intended for use with a

DETACHABLE POWER SUPPLY CORD.

• for equipment provided with a DETACHABLE POWER SUPPLY CORD, be not lighter than

light PVC sheathed flexible cord according to IEC 60227-1:2007 (designation 60227

IEC 52);
• for screened cords of MOVEABLE EQUIPMENT, the flexing test of 3.1 of
IEC 60227-2:1997;

NOTE 2 Although screened cords are not covered in the scope of IEC 60227-2, the relevant flexing tests

of IEC 60227-2 are used.

– other types of cords may be used if they have similar or better electro-mechanical and fire

safety properties as above.

NOTE 3 Where national or regional standards exist, they can be used to show compliance with the above

paragraph.

For equipment required to have protective earthing, a PROTECTIVE EARTHING CONDUCTOR shall

be included in the MAINS SUPPLY cord.

A MAINS SUPPLY cord shall have conductors with a cross-sectional area not less than those

specified in Table 3B.
Compliance is checked by inspection. For screened cords, damage to the screen is
acceptable provided that:

– during the flexing test the screen does not make contact with any conductor, and

---------------------- Page: 13 ----------------------
– 12 – 60950-1 Amend.2 © IEC:2013

– after the flexing test, the sample withstands the appropriate electric strength test between

the screen and all other conductors.

Table 3E – Sizes of terminals for mains supply conductors and protective earthing

conductors
Replace the existing table by the following new table:
Minimum nominal thread Area of cross section
diameter mm
RATED CURRENT
Conductor size
A 2
b b
up to and including
Pillar type or Screw type Pillar type or Screw type
stud type stud type
10 1 3,0 3,5 7 9,6
16 1,5 3,5 4,0 9,6 12,6
25 2,5 4,0 5,0 12,6 19,6
32 4 4,0 5,0 12,6 19,6
40 6 5,0 5,0 19,6 19,6
63 10 6,0 6,0 28 28
80 16 7,9 7,9 49 49

This table is also used for the sizes of terminals for PROTECTIVE BONDING CONDUCTORS if specified in 2.6.4.2.

"Screw type" refers to a terminal that clamps the conductor under the head of a screw, with or without a

washer.

As an alternative to the requirements of this table, the protective earthing conductor may be attached to

special connectors, or suitable clamping means (for example, an upturned spade or closed loop pressure

type; clamping unit type; saddle clamping unit type; mantle clamping unit type; etc.) that is secured by a

screw and nut mechanism to the metal chassis of the equipment. The sum of the cross-sectional areas of the

screw and the nut shall not be less than three times the cross-sectional area of the conductor size in

Table 2D or Table 3B as applicable. The terminals shall comply with IEC 60998-1 and IEC 60999-1 or

IEC 60999-2.
3.4.11 Multiple power sources

Add, after the existing first paragraph of this subclause, the following new paragraph:

If the disconnect device is not in the equipment, the marking shall be on the equipment and

located close to the MAINS input terminals.
4.1 Stability

Add, at the end of the existing text of the first dashed item, the following new paragraph and

new note:

Alternatively, the unit is placed in its intended position of use on a plane, inclined at

...

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