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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.e.
The pollution severity categories are
as follows:
Pollution severity category 1:
No pollution, only dry, non-conductive
pollution that has influence.
The values given table are still taken into account tables
and the symbol.g. 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. The lower value the phase-to-neutral voltage,
while the higher value the phase-to-phase voltage. The lower value the phase-to-neutral voltage,
while the higher value the phase-to-phase voltage.g.
**) Because the common changes, the meaning the symbol has
not been used table i.
*) assumed that the rated voltage the electrical equipment not
lower than the nominal voltage the power supply. Where only one
value indicated, refers 3-wire, 3-phase systems and specifies
the value phase-to-phase. stationary motors
with permanent connections the
permanent installation. the symbol indicates 4-wire 3-phase
distribution system.e.
Pollution severity category 2:
Non-conductive pollution only; occasional
condensation may cause temporary
conductivity..5 12.
Pollution severity category 3:
Conductive pollution, dry, non-
conductive pollution that liable
be rendered conductive through
con-densation.
– 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.
Pollution severity category 4:
Contamination results constant
conductivity, e. The values given table are still taken
into account tables and the symbol.
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 symbol indicates 4-wire 3-phase
distribution system.
.
– Equipment overvoltage category III
is equipment that part the
permanent electrical installation and other
equipment where higher degree of
availability expected.
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.W.
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.
**) Because the common changes, the meaning the symbol has
not been used table i. Where only one
value indicated, refers 3-wire, 3-phase systems and specifies
the value phase-to-phase. Measures limit
transient overvoltages the specific level
are taken outside the equipment, either in
the permanent installation between the
permanent installation and the
equipment.
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. caused conductive
dust, rain snow. point earthing
V V
12.7
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).
*) assumed that the rated voltage the electrical equipment not
lower than the nominal voltage the power supply.
Note: Examples such equipment are
household appliances, portable tools
and similar loads.
– Equipment overvoltage category II
is equipment connected the
permanent electrical installation a
building.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
