IEC
60664
-3:
2016
©
IEC
2016
- 4 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INSULATION COORDINATION FOR EQUIPMENT
WITHIN
LOW-VOLTAGE
SYSTEMS -
Part
3:
Use
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FOREWORD
The
I
nternat
i
ona
l
Elect
『
otechn
i
ca
l
Commission (IEC) is a
worldw
ide
organ
i
zation
for standar
dizat
ion comprisi
ng
all national electrotechnical
comm
ittees (IEC National Committees). T
he
object
of
IEC is to
promote
international co-operation on
al
l questions concerning standardization in the el
ectr
ical and
electronic
fields. To
this end and in addition to
other
activ
ities, IEC publishes
Internat
ional
Standa
『
ds
,
Technical Speci
ficat
ions,
Technical Reports, Publi
cly
Available Specifications (PAS) and Gui
des
(hereaf
ter referred to as “IEC
Publi
cat
ion(s)”
).
Their
preparat
ion is entrusted to technical committees; any IEC
Nat
ional Committee
interested
in the subject
dealt
wi
th
may
par
ticipate in this preparatory work.
Inte
r
na
tional,
governmen
tal
and
non-
governmen
tal
organ
izations liaising with the IEC also participate
in
this preparation. IEC collaborates closely
with
the
Internat
ional Organi
zat
ion
for
Standardi
zat
ion (ISO) in
accordance
with conditions
dete
『『
n
i
ned
by
agreement between the two organi
zat
ions.
..
‘
,
‘
,
‘‘
The
formal
dec
isions
o
『
agreements
of
IEC on technical matters express, as
nearly
as possibl
e,
an international
consensus
of
opinion on t
he
『
elevant
subjects since
each
technical
comm
ittee has
『
ep
r
esentation
fr
om all
i
nt
erested IEC
Nat
ional Committees.
2)
IEC Publ
icat
ions have the form
of
『
ecommendat
i
ons
f
or
international
use
and are accepted by IEC
Nat
ional
Committees in that sense.
Wh
ile all reasonable
efforts
are made to ensure that
the
technical content
of
IEC
Publi
cat
ions
is
accu
『
ate
,
IEC
cannot
be
he
ld responsible for the
way
in which they are
used
or for any
misinterpretation by
any
end user.
3)
4)
In
order
to pro
mo
te i
nterna
tional
un
if
ormity, IEC National Committees undertake to
a~p
l
y
IEC Publi
cat
ions
transpa
『
ently
to the maximum extent possible in
thei
『
nationa
l
and regi
ona
l
publica
tions. Any divergence
between any IEC Publi
cat
ion and the
correspond
i
ng
nat
ional
or
regional
pub
l
icat
ion shall be clearly i
ndica
ted in
the
latte
r
φ
bodies
p
『
ovide
conformity
is not responsible for any
IEC itself
does
not pr
ovide
any attestation
of
conformity. Independent certification
assessment
serv
ices and, in some areas,
access
to IEC marks
of
conformity. IEC
services
ca
『『
ied
out
by
independent
certification
bodies
.
5)
All users should
ensure
that
they
have
the
latest
edition
of
this publi
cat
ion.
No liability shall attach to IEC
O
『
i
t
s
di
r
ecto
『s,
employees, servants
O
『
agents
including indivi
dua
l experts and
members
of
its
technical
committees
and IEC National Commi
tt
ees
for
any
personal injury, property damage
o
『
other
damage
of
any
nature
whatsoever,
whethe
r di
rect
or
indirect, or for costs (including legal
fees)
and
expenses arising
out
of
the publication,
use
of,
o
『『
e
l
iance
upon, this IEC
Publ
i
cat
ion
O
『
any
other
IEC
Publi
cat
ions.
6)
7)
Attention is drawn to
the
Normat
ive
refe
rences cited in this publication. Use of t
he
referenced publi
cat
ions is
i
ndispe
nsab
le
for
the
correct
app
l
icat
ion
of
this
pub
l
icat
ion.
8)
Attention
is
drawn to the possibility
that
some
of
the elements
of
this IEC Publ
ic
ation
ma
y be the subject
of
patent
ri
ghts
. IEC shall not be
he
ld responsible
for
identifying
any
or
all such
patent
rights.
9)
committee
TC
109:
International
Standard
IE C
60664-3
has
been
prepared
by
IEC
technical
Insulation
co-ordination
for
low-voltage
equipment.
It
has
the
status
of
a
basic
safety
publication
in
accordance
with
IEC
Guide
104
.
published
in
2003
and
Amendment
replaces
the
second
edition
a
technical
revision.
This
third
edition
cancels
and
1:2010.
This
edition
constitutes
previous
with
respect
to
the
significant
technical
changes
This
edition
includes
the
following
edition
:
information
added
concerning
interpolation;
provided
scratch
test
is
only
for
ty
p e 2
pr
。
tecti
。
n
;
a)
b)
