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g. the symbol indicates 4-wire 3-phase
distribution system.
.
Note: Examples such equipment are
household appliances, portable tools
and similar loads. This because the actual voltage earth deter-
mined the insulation resistance and capacitive reactance each
phase earth; thus, low (but acceptable) insulation resistance of
one phase can earth and raise the other two full phase-to-phase
voltage earth.
Pollution severity category 2:
Non-conductive pollution only; occasional
condensation may cause temporary
conductivity. Where only one
value indicated, refers 3-wire, 3-phase systems and specifies
the value phase-to-phase. The lower value the phase-to-neutral voltage,
while the higher value the phase-to-phase voltage.
Table 3b: 3-phase 4-wire systems
Rated voltage
of the power
supply (mains)*)
Voltages for table 4
For insulation
phase-to-phase 1)
For insulation
phase-to-earth 1)
All systems 3-phase
4-wire
systems
with earthed
neutral wire 2)
3-phase
3-wire systems
unearthed1)
or phase-
earthed
V V
60 63
110/120/127 125 125
150**) 160 160
208 200 125 200
220/230/240 250 160 250
300**) 320 320
380/400/415 400 250 400
440 500 250 500
480/500 500 320 500
575 630 400 630
600**) 630 630
660/690 630 400 630
720/830 800 500 800
960 1000 630 1000
1000**) 1000 1000
1) Phase-to-earth insulation levels for unearthed impedance-earthed
systems are equal those phase-to-phase because the operating
voltage earth any phase can, practice, reach full phase-to-
phase voltage.
The following aspects apply the
overvoltage categories in accordance
with the German standard DIN VDE 0110-1:
Electrical equipment fed directly from the
low-voltage mains
Specification specific overvoltage
category shall based the following:
– Equipment overvoltage category I
is equipment that intended be
connected the permanent electrical
installation building.
**) Because the common changes, the meaning the symbol has
not been used table i.
The pollution severity categories are
as follows:
Pollution severity category 1:
No pollution, only dry, non-conductive
pollution that has influence.
Pollution severity category 4:
Contamination results constant
conductivity, e.
*) assumed that the rated voltage the electrical equipment not
lower than the nominal voltage the power supply. The lower value the phase-to-neutral voltage,
while the higher value the phase-to-phase voltage. This because the actual voltage earth deter-
mined the insulation resistance and capacitive reactance each
phase earth; thus, low (but acceptable) insulation resistance of
one phase can earth and raise the other two full phase-to-phase
voltage earth.
*) assumed that the rated voltage the electrical equipment not
lower than the nominal voltage the power supply.
Note: Examples such equipment are
distribution boards, circuit-breakers,
wiring systems (IEV 826-06-01,
including cables, busbars, junction
boxes, switches, power sockets) the
permanent installation, and equipment
for industrial use and some other
equipment, e.W.. point earthing
V V
12. Measures limit
transient overvoltages the specific level
are taken outside the equipment, either in
the permanent installation between the
permanent installation and the
equipment.
– Equipment overvoltage category II
is equipment connected the
permanent electrical installation a
building. Where only one
value indicated, refers 3-wire, 3-phase systems and specifies
the value phase-to-phase.5 –
24 –
25
30 –
42
48 –
50**)
60 –
30–60 32
100**) 100 –
110 125 –
120
150**) 160 –
220 250 –
110–220 250 125
120–240
300**) 320 –
220–440 500 250
600**) 630 –
480–960 1000 500
1000**) 1000 –
1) Phase-to-earth insulation levels for unearthed impedance-earthed
systems are equal those phase-to-phase because the operating
voltage earth any phase can, practice, reach full phase-to-
phase voltage.5 12. caused conductive
dust, rain snow.
– Equipment overvoltage category IV
is for use the proximity the
incoming supply point the electrical
Table 3a: Single-phase 3-wire systems
Rated voltage
of the power
supply (mains)*)
Voltages for table 4
For insulation
phase-to-phase 1)
For insulation
phase-to-earth 1)
All systems 3-wire systems,
neutr.7
Technicalappendix
W
IEC clearance and creepage distances
Note: Clearances that not comply
with case must subjected an
impulse withstand voltage test (see
table 2a, footnote 1).g.
2) For electrical equipment for use both 3-phase 4-wire and 3-phase
3-wire supplies, earthed and unearthed, use the values for 3-wire
systems only. The values given table are still taken
into account tables and the symbol.
**) Because the common changes, the meaning the symbol has
not been used table i.
Pollution severity category 3:
Conductive pollution, dry, non-
conductive pollution that liable
be rendered conductive through
con-densation.
– Equipment overvoltage category III
is equipment that part the
permanent electrical installation and other
equipment where higher degree of
availability expected. the symbol indicates 4-wire 3-phase
distribution system.
The values given table are still taken into account tables
and the symbol. stationary motors
with permanent connections the
permanent installation.e.e
