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IEC 60269-6
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Low-voltage fuses –
Part 6: Supplementary requirements for fuse-links for the protection of solar
photovoltaic energy systems
Fusibles basse tension –
Partie 6: Exigences supplémentaires concernant les éléments de remplacement
utilisés pour la protection des systèmes d'énergie solaire photovoltaïque
IEC 60269-6:2010-09/AMD1:2021-04(en-fr)
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IEC 60269-6
Edition 1.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Low-voltage fuses –
Part 6: Supplementary requirements for fuse-links for the protection of solar
photovoltaic energy systems
Fusibles basse tension –
Partie 6: Exigences supplémentaires concernant les éléments de remplacement
utilisés pour la protection des systèmes d'énergie solaire photovoltaïque
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-9631-8
– 2 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
FOREWORD
This amendment has been prepared by subcommittee 32B: Low-voltage fuses, of IEC
technical committee 32: Fuses.
The text of this amendment is based on the following documents:
FDIS Report on voting
32B/698/FDIS 32B/699/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• withdrawn,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.
_____________
1.1 Scope and object
Replace the first two sentences of the Scope with the following new text:
These supplementary requirements apply to fuse-links for protecting PV strings and PV arrays
in equipment for circuits of nominal voltages up to 1 500 V DC, and also, in so far as they are
applicable, for circuits of higher nominal voltages.
1.2 Normative references
Delete the date and the footnote after the following reference:
IEC 60269-1
Add the following new references:
IEC 61386-1, Conduit systems for cable management – Part 1: General requirements
IEC 61730-2, Photovoltaic (PV) module safety qualification – Part 2: Requirements for testing
IEC 62548, Photovoltaic (PV) arrays – Design requirements
IEC 60364-7-712, Low voltage electrical installations – Part 7-712: Requirements for special
installations or locations – Solar photovoltaic (PV) power supply systems
© IEC 2021
2 Terms and definitions
2.2 General terms
Add, after the title of 2.2, the following new note:
NOTE Photovoltaic = PV.
2.2.101
Replace the existing title and text of 2.2.101 with the following new title and text:
2.2.101
PV fuse-link
2.2.101.1
PV fuse-link (general)
fuse-link capable of breaking, under specified conditions, any current value within the
breaking range
NOTE A PV fuse-link operates under two main conditions:
• Short-circuit in a string (see IEC 62548 and IEC 60634-7-712 or in an array or sub-array (see IEC 62548 and
IEC 60634-7-712) which leads to a very low over-current.
• Short-circuit current supplied by the discharge of the PV inverter through a very low inductance. This condition
leads to a very high rate of rise of current equivalent to a low value of time constant, corresponding to
Table 104.
2.2.101.2
PV string fuse-link
fuse-link for the short-circuit and overload protection in a string
2.2.101.3
sub-array or array or array field fuse-link
fuse-link for the short-circuit and cable overload protection in an sub-array or array or array
field
2.2.101.4
functional earthing fuse-link
fuse-link for earthing circuit protection of the photovoltaic (or PV) arrays. Functional earthing
fuse-link arrangement can be found in IEC 60364-7-712 and IEC 62548
2.2.102
Delete existing Subclause 2.2.102.
2.2.103
Delete existing Subclause 2.2.103.
2.2.104
Delete the words “array field, assembly, generator, panel” from the text of Subclause 2.2.104
and renumber 2.2.104 to 2.2.102 and 2.104.1 to 2.2.102.1
Delete Subclauses 2.2.104.2, 2.2.104.3, 2.2.104.4 and 2.2.104.5.
Renumber 2.2.104.6 as 2.2.102.2 and 2.2.104.7 as 2.2.102.3.
2.2.105
Delete Subclause 2.2.105.
– 4 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
2.2.106
Delete Subclause 2.2.106.
2.2.107
Renumber 2.2.107 as 2.2.102.4.
2.2.108
Renumber 2.2.108 as 2.2.102.5.
2.2.109
Renumber 2.2.109 as 2.2.103 and replace the existing text with the following new text:
2.2.103
currents
2.2.103.1
short circuit current
(symbol I ), (unit:A)
SC
electric current at the output terminals of a PV device at a particular temperature and
irradiance, when the device output voltage is equal or close to zero
2.2.103.2
maximum overcurrent rating
I
MOD_MAX_OCPR
PV module maximum overcurrent protection rating determined by IEC 61730-2
2.2.103.3
short circuit current of a PV module
I
SC MOD
short circuit current of a PV module or PV string at standard test conditions (STC), as
specified by the manufacturer
2.2.103.4
short circuit current of an array
I
SC ARRAY
short-circuit current of the PV array at standard test conditions (STC), which is equal to
I = I × N where N is the total number of parallel-connected PV strings in the
SC ARRAY SC MOD S S
PV array
NOTE 1 A PV string is a number of PV modules connected in series. The short circuit current of a string is equal
to I .
SC,MOD
2.2.103.5
short circuit current of an sub-array
I
SC S-ARRAY
short circuit current of a PV sub-array at standard test conditions (STC), which is equal to
I = I × N where N is the number of parallel-connected PV strings in the
SC S-ARRAY SC MOD SA SA
PV sub-array
2.2.103.6
maximum reverse current of an array
(symbol I ) (unit: A)
RM
maximum reverse current accepted by the module or the panel
2.2.110
Renumber 2.2.110 as 2.2.104.
© IEC 2021
Replace, in the title of 2.2.110, "photovoltaic" by "PV".
Delete Subclauses 2.2.110.1, 2.2.110.2, 2.2.110.3 and 2.2.110.4.
Renumber 2.2.110.5 as 2.2.104.1 and replace "output electrical current" by "load current".
Renumber 2.2.110.6 as 2.2.104.2.
Delete Subclause 2.2.110.7.
Table 101 – Conventional times and currents for “gPV” fuse-links
Replace existing Table 101 with the following new table:
Table 101 – Conventional times and currents for "gPV" fuse-links
Conventional current
Rated current Conventional time Type "gPV" Fuse type
A h I I
nf f
1 1,05 -
I ≤ 63 String fuse-link
n
1)
2 - 1,35
63 < I ≤ 160 2
n
* *
160 < I ≤ 400 3 1,13 1,45 Subarray or Array fuse-link
n
400 < I 4
n
1)
NOTE For I = 1,35 I the operating time is 2 h (The thermal withstand capability of a PV module under
f n
reverse current is qualified during a 2 h test specified in module safety test from IEC 61730 and is specified on
the module as the "maximum overcurrent protection" value).
*
The use of these values for conventional currents is not permitted in North America. String fuse-link
conventional current values are permitted for sub-array and array fuse-links
8.3.3 Measurement of power dissipation of the fuse-link
Add the following new sentence at the end of the second paragraph of 8.3.3:
This test maybe performed with either alternating or direct current.
8.4.3.1 Verification of conventional non-fusing and fusing current
Replace the existing first sentence of 8.4.3.1 with the following new sentence:
It is permissible to make the following tests at a reduced voltage and either alternating or
direct current.
Replace existing bullet point b) with the following new text:
b) The fuse-link is subjected to the conventional fusing current. It shall operate within the
conventional time (Table 101). For string fuse-links it is also acceptable when I = 1,35 In
f
when the fuse link operates within t = 2 hours as specified in Table 101, Note 2. The
c
fuse-link shall operate without external effects or damage.
NOTE If this test arrangement is not applicable, special tests shall be performed according to the
manufacturer’s instructions and all pertinent data shall be recorded in the test report.
– 6 – IEC 60269-6:2010/AMD1:2021
© IEC 2021
8.4.3.2 Verification of rated current
Replace the existing text of 8.4.3.2 with the following new text:
The test requested in 8.4.3.2 of IEC 60269-1:2006 is replaced by the following. The
requirements for safe operation apply from IEC 60 269-1, 8.5.8:2006.
The tests may be performed with either alternating or direct current at reduced voltage.
a) String fuse-links:
Rated current ≤ 63 A: Three samples are to undergo 3 000 repetitions of current cycling
where one cycle is represented in Figure 101. None of the samples shall exhibit cracking
of the fuse body. This test maybe performed with either alternating or direct current.
After this test, the resistance of the fuse-link at room temperature shall not have changed
by more than 10 %, and then tests presented in 8.11.2.4 and Tables 102 and 103 shall be
made.
b) Sub array and Array fuse-links, rated current > 63 A (these fuse-links protect cables):
The test required in 8.4.3.2 of IEC 60269-1:2006 is applicable with the following
modifica
...