IEC 62040-1:2008/AMD1:2013

Amendment 1 - Uninterruptible power systems (UPS) - Part 1: General and safety requirements for UPS

Amendement 1 - Alimentations sans interruption (ASI) - Partie 1: Exigences générales et règles de sécurité pour les ASI

General Information

• Status: Published
• Publication Date: 09-Jan-2013
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: SC 22H - Uninterruptible power systems (UPS)
• Drafting Committee: MT 62040-1 - TC 22/SC 22H/MT 62040-1
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 12-Jul-2017

Relations

• Amends: IEC 62040-1:2008 - Uninterruptible power systems (UPS) - Part 1: General and safety requirements for UPS
• Effective Date: 05-Sep-2023
• Revised: IEC 62040-1:2017 - Uninterruptible power systems (UPS) - Part 1: Safety requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62040-1 ®
Edition 1.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Uninterruptible power systems (UPS) –
Part 1: General and safety requirements for UPS

Alimentations sans interruption (ASI) –
Partie 1: Exigences générales et règles de sécurité pour les ASI

IEC 62040-1:2008/A1:2013
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IEC 62040-1 ®
Edition 1.0 2013-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 1
AMENDEMENT 1
Uninterruptible power systems (UPS) –

Part 1: General and safety requirements for UPS

Alimentations sans interruption (ASI) –

Partie 1: Exigences générales et règles de sécurité pour les ASI

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX J
ICS 29.200 ISBN 978-2-83220-559-4

– 2 – 62040-1 Amend.1 © IEC:2013

FOREWORD
This amendment has been prepared by subcommittee 22H: Uninterruptible power systems

(UPS), of IEC technical committee 22: Power electronic systems and equipment.

The text of this amendment is based on the following documents:

FDIS Report on voting
22H/151/FDIS 22H/155/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• withdrawn,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.
_____________
INTRODUCTION TO THE AMENDMENT
This amendment determines the short-time withstand current test requirements for the
purpose of verifying the safety of the UPS when a short circuit is applied across the output
terminals under prescribed modes of operation wherein the output power is delivered by the
a.c. input through a low impedance path.
FOREWORD
Add, at the end of the list beginning " – update of normative references" the following new
item:
– Amendment 1 introduces short-time withstand current requirements when a short-circuit is
applied at the output of the UPS (5.5.4).

2 Normative references
Add the following new reference:
IEC 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General
rules
62040-1 Amend.1 © IEC:2013 – 3 –

3.2 UPS electrical ratings
Add the following new terms and definitions:

3.2.4
rated peak withstand current
I
pk
value of peak short-circuit current, declared by the UPS manufacturer, that can be withstood

under specified conditions
NOTE For the purpose of this standard, I refers to the initial asymmetric peak value of the prospective test

pk
current listed in Table 3
3.2.5
rated short-time withstand current
I
cw
r.m.s. value of short-time current, declared by the UPS manufacturer, that can be carried
without damage under specified conditions, defined in terms of current and time
3.2.6
rated conditional short-circuit current
I
cc
r.m.s. value of prospective short-circuit current, declared by the UPS manufacturer, that
can be withstood for the total operating time (clearing time) of the short-circuit protective
device (SCPD) under specified conditions
NOTE The short-circuit protective device may form an integral part of the UPS or may be a separate unit.
3.2.7
low impedance path
path containing devices that for UPS load purposes present negligible impedance such as
cabling, switching devices, protecting devices and filtering devices
NOTE The devices in a low impedance path may under short-circuit conditions present current limiting
characteristics. Examples include current limiting fuses, current limiting circuit-breakers, transformers and
inductors.
3.2.8
prospective short-circuit current
I
cp
r.m.s. value of the current which would flow if the supply conductors to the circuit are short-
circuited by a conductor of negligible impedance located as near as practicable to the supply
terminals of the UPS
4.7.2 Power rating
Add to the end of the list, the following new item:
– rated short-time withstand current (I ) or rated conditional short-circuit current (I )
cw cc
in accordance with 5.5.4.
Renumber the existing note as Note 1 and add the following new Note 2:
NOTE 2 Table 3 values may be exceeded and so marked.

– 4 – 62040-1 Amend.1 © IEC:2013

4.7.12 Protection in building installation

Add the following paragraphs at the beginning of 4.7.12:

The UPS manufacturer shall state, as applicable, the rated short-time withstand current,

(I ) or rated conditional short circuit current (I ). This current shall be equal to or higher
cw cc
than the I value stated in 5.5.4.3.1 (column 2 of Table 3).
cp
If an I value higher than that specified in Table 3 is stated, the following applies.
cp
a) If higher I stated ≤ 10 kA:
cp
the values corresponding to the next higher applicable line of Table 3 apply.
b) If higher I stated > 10 kA:
cp
values 16 kA, 20 kA, 25 kA, 35 kA, 50 kA, 65 kA, 85 kA, 100 kA are preferred and the
values corresponding to line 500 < I of Table 3 apply.
NOTE 1 Examples of Table 3 line values to be used when a higher I or I is stated.
cw cc
a) If a 50 A UPS is declared to sustain I = 8 kA (instead of 6 kA), use the values of line 75 < I < 400 in Table 3.
cw
b) If a 1 000 A UPS is declared to sustain I = 85 kA (instead of 20 × 1 000 = 20 kA), use the values of line
cw
500 < I in Table 3.
The installer can then verify that the prospective short-circuit current resulting at the a.c.
input terminals of the unit is equal to or less than the value declared by the UPS
manufacturer. Otherwise, subject to an agreement between the manufacturer and the user, a
solution shall be procured. Such a solution may consist in employing external current-limiting
overcurrent protectors or customizing the UPS accordingly.
Irrespective of the UPS being a single unit or a unit in a paralleled system, the prospective
short-circuit current of the a.c. input to be verified is that available at the relevant
connection point of each unit.
Renumber the existing note as Note 2.

5.5 Overcurrent and earth fault protection
Add the following subclause:
5.5.4 Short-time withstand current

5.5.4.1 General
The short-time withstand current test shall be performed as a type test to verify the safety
of the UPS when a short circuit is applied across the output terminals under prescribed modes
of operation, except where exempted. Refer to Annex P, Figure P.1 for a typical circuit for
implementation of the test and to 5.5.4.3.2 for exemptions.
NOTE Internal faults are not considered in this section. The effect of faults originated within the UPS are
addressed in 8.3.
5.5.4.2 Modes of operation
Testing is performed only in modes of operation wherein the output power is delivered by the
a.c. input through a low impedance path.
NOTE 1 Examples of such modes of operation include:
– input voltage and frequency dependent (VFD) UPS operating in normal and/or bypass modes;

62040-1 Amend.1 © IEC:2013 – 5 –

– input voltage independent (VI) UPS operating in normal and/or bypass modes;

– input voltage and frequency independent (VFI) UPS when operating in bypass mode;

– any UPS with built-in maintenance bypass switch when operating in maintenance bypass mode.

NOTE 2 UPS performance classifications VFD, VI and VFI are detailed in IEC 62040-3.

5.5.4.3 Test procedure
5.5.4.3.1 General application
The UPS a.c. input shall be connected to a supply capable of delivering the prospective test

current in accordance with Table 3. The UPS shall be in the appropriate mode of operation

(see 5.5.4.2) and otherwise operating without load and at rated input voltage and frequency. A
short-circuit shall then be applied across the output terminals of the UPS. A UPS rated for
multiple input and output voltages may be tested at any of its rated input voltages provided
that applicable interrupting components have been certified or tested to interrupt the
prospective test current at the highest rated input voltage.
NOTE 1 The manufacturer can opt to perform additional tests at other rated voltages and currents.
NOTE 2 For consideration in a future edition of this standard, the making capability of the short-circuit current into
the low impedance path can be verified for safety purposes. Such verification could involve tests or analysis of
component documentation. Examples include a UPS that in normal mode of operation, does not supply the output
terminals through a low impedance path, but that upon application of a short-circuit across the output terminals,
automatically transfers into a low impedance path.
NOTE 3 For consideration in a future edition of this standard it will be evaluated whether tests would be permitted
at voltages lower than rated and, subject to the phase current being observed not interrupted throughout the
minimum duration listed in Table 3, whether the manufacturer could then declare the I to be the phase current
cw
recorded during the test.
The test shall be repeated by placing a short circuit across the phase closest to the neutral
terminal when the latter is provided. However, the phase-to-neutral test is not required when
the neutral construction is at least as robust as that of the phase conductors in terms of cross-
sectional area, mechanical support and clearance.
If the manufacturer declares a short-time withstand current higher than shown in Table 3, the
declared value applies for test purposes.
The test is considered complete when the prospective test current has been
...