IEC 62477-1:2012/AMD1:2016

IEC 62477-1 ®
Edition 1.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Safety requirements for power electronic converter systems and equipment –
Part 1: General
Exigences de sécurité applicables aux systèmes et matériels électroniques de
conversion de puissance –
Partie 1: Généralités
IEC 62477-1:2012-07/AMD1:2016-07(en-fr)

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IEC 62477-1 ®
Edition 1.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
G ROUP SAFETY PUBLICATION
PU BLICATION GROUPÉE DE SÉCURITÉ

AMENDMENT 1
AMENDEMENT 1
Safety requirements for power electronic converter systems and equipment –

Part 1: General
Exigences de sécurité applicables aux systèmes et matériels électroniques de

conversion de puissance –
Partie 1: Généralités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-3526-3

– 2 – IEC 62477-1:2012/AMD1:2016
© IEC 2016
FOREWORD
This amendment has been prepared by the IEC technical committee TC22: Power electronic
systems and equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
22/270A/FDIS 22/274/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 website 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• withdrawn,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.
_____________
3 Terms and definitions
Replace the existing term and definition 3.35 by the following new term and definition:
3.35
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 PECS
[SOURCE: IEC 61439-1:2011, 3.8.7], modified – "ASSEMBLY" is replaced by "PECS".]
Add the following new terms and definitions:
3.66
conditional short-circuit current
I
cc
r.m.s. value of a prospective short-circuit current available from a supply source, declared by
the PECS manufacturer under specified conditions, using a specific type of short-circuit
protective device protecting the PECS
Note 1 to entry: See also Figure N.1.
Note 2 to entry: The supply source might be a mains or non-mains supply.
Note 3 to entry: The declared I is the minimum current value used for calibration of the supply source.
cc
© IEC 2016
[SOURCE: IEC 61439-1: 2011. 3.8.10.4], modified – The definition is modified to fit to the use
of PECS applications.]
3.67
current-limiting protective device
protective element that, during its operation and specified current range, limits the current to
a substantially lower value than the peak value of the prospective current
Note 1 to entry: A current-limiting device is normally a current-limiting fuse or a current-limiting circuit breaker.
See IEC 60050-441:1984, 441-18-10.
3.68
minimum required prospective short-circuit current
I
cp,mr
r.m.s.value of a minimum short-circuit current, which is needed to be available from a supply
source in order to ensure safe interruption of the fault, and which is declared by the PECS
manufacturer and tested under specified conditions, using a specific type of short-circuit
protective device protecting the PECS.
3.69
overcurrent protective device
OCPD
device provided to interrupt an electric circuit in case the current in the electric circuit
exceeds a predetermined value for a specified duration
[SOURCE: IEC 60050-826:2004 826-14-14, modified – "conductor" deleted]
3.70
peak withstand current
I
pk
value of peak short-circuit current, declared by the PECS manufacturer, that can be carried
without damage under specified conditions, defined in terms of current and time
Note 1 to entry: For the purpose of this standard, I refers to the initial asymmetric peak value of the prospective
pk
test current.
Note 2 to entry: Time may be specified as the number of successive cycles at 50 Hz or 60 Hz.
[SOURCE: IEC 61439-1:2011, 3.8.10.2, modified – The definition is modified to fit to the use
of PECS application.]
3.71
short-circuit protective device
SCPD
device intended to protect a circuit or parts of a circuit against short-circuit currents by
interrupting them
Note 1 to entry: A short-circuit protective device is suitable for protection against short-circuit only, not for
protection against overload. An OCPD may also incorporate the function of a SCPD.
[SOURCE: IEC 61439-1:2011, 3.1.11, modified – Note added]
3.72
short time withstand current
I
cw
r.m.s. value of short time current, declared by the PECS manufacturer, that can be withstood
under specified conditions, defined in terms of current and time

– 4 – IEC 62477-1:2012/AMD1:2016
© IEC 2016
[SOURCE: IEC 61439-1:2011, 3.8.10.3, modified – "rated" removed from the term and
"ASSEMBLY" replaced by "PECS”]
4.2 Fault and abnormal conditions
Add, after the second paragraph, the following new paragraph:
Components in 4.2 also include insulation systems, ports, etc.
Add, at the end of the bullet list, the following new bullet:
• electromagnetic force and thermal hazard according to 4.3.
4.3.1 General
Add, after the first paragraph, the following new paragraph:
To ensure proper coordination with short-circuit protective devices and the available
prospective short-circuit current, the PECS manufacturer shall specify and test for each
mains supply input port of the PECS:
• conditional short-circuit current (I ) according to 4.3.2.2, or
cc
• rated short time withstand current (I ) according to 4.3.5.
cw
Individual mains supply ports of a PECS shall have specific short-circuit ratings of either I
cc
or I , or of both.
cw
in 4.3.5
Only in case where compliance does not rely on the characteristic of SCPD, the I
cw
can apply.
In case an output port is connected or intended to be connected to the input mains supply
port, the output port shall also be specified with an I or I rating (e.g. bypass between
cc cw
input mains supply port and output port).
For marking see 6.2.
See Annex N for further information.
4.3.2.2 Input ports short-circuit withstand current
Replace the title and text as follows:
4.3.2.2 Specification of the rated conditional short-circuit current (I ) on input ports
cc
In case the PECS manufacturer selects the conditional short-circuit current (I ) rating
cc
according to 4.3.1, the following shall be specified:
• conditional short-circuit current (I ),
cc
• characteristics of the short-circuit protective device, and
• minimum required prospective short-circuit current (I ).
cp,mr
Compliance is shown, through evaluation according to 4.2 to determine the appropriate
combination of testing according to 5.2.4.4, 5.2.4.6 and 5.2.3.11.3 in order to evaluate single
fault and abnormal conditions, including insulation faults.
If it is shown by analysis that the result of one test is representative of the worst case, less
severe combinations need not be tested.

© IEC 2016
Add, after 4.3.4, the following new clause:
4.3.5 Input ports short time withstand current, I
cw
In case the PECS manufacturer selects the short time withstand current (I ) rating according
cw
to 4.3.1, the following shall be specified:
• rated short time withstand current (I ),
cw
• associated duration, and
• rated peak withstand current (I ).
pk
Compliance is shown, through evaluation according to 4.2 to determine the appropriate
combination of testing according to 5.2.3.11.3 and 5.2.4.10 in order to evaluate single fault
and abnormal conditions, including insulation faults.
If it is shown by analysis that the result of one test is representative of the worst case, less
severe combinations need not be tested.
5.2.4.2 Pass criteria
Add, after the last bullet point, the following new bullet points:
• components, e.g. busbar supports, used for the mounting of live parts shall not break
away from their initial position,
• no conductor shall get pulled out of its terminal connector.

Add, in Table 22 under "Abnormal operation tests", the following new test:
X  4.3.5 5.2.4.10
Short time withstand current (I ) test
cw
Add, after 5.2.4.9.4, the following new subclause:
5.2.4.10 Short time withstand current (I ) test (type test)
cw
5.2.4.10.1 General
As required in 4.3.5, the short time withstand current te
...