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g.
Pollution severity category 3
• Conductive pollution, dry,
non-conductive pollution that is
liable rendered conductive
through condensation.
Measures limit transient surges
to the specific level are taken
outside the equipment, either the
permanent installation between
the permanent installation and the
equipment.
Design clearances and creepage distances
in electrical equipment influencing factors
Table Rated impulse withstand voltages for electrical equipment
Rated voltage power
supplies system V
Rated impulse withstand voltage kV
Three-phase
systems
Single-phase
systems with
neutral point
Electrical equipment
at the supplies point
of the installation
(Surge
category IV)
Electrical equipment
as part the
permanent
installation
(Surge
category III)
Electrical equipment
to connected to
the permanent
installation
(Surge
category II)
Specially protected
electrical equipment
(Surge
category I)
120 240 4.00 4.Electrical data
Rated impulse withstand voltage
The rated impulse withstand voltage is
derived from:
• Voltage conductor earth
(the rated voltage the network,
taking into account all networks)
• Surge category
Surge categories
are stipulated accordance with the
German standard DIN VDE 0110-1
(for electrical equipment fed directly
from the low-voltage network).
Pollution severity categories
Pollution severity category 1
• No pollution, only dry,
non-conductive pollution that has no
influence.
Pollution severity category 4
• Contamination results constant
conductivity, e.171282250000 2012/2013
.g.
Unless explicitly stated otherwise, the
dimensioning clearance and
creepage distances and the resulting
rating data for electromechanical
products (terminals, terminal strips,
PCB connection terminals and plug-in
connectors) based pollution
severity and surge category III, taking
account all network types.50
1000 Values depend the particular project of, values are available, the values the
preceding line apply.g.
Surge category III
• Equipment that part the
permanent electrical installation
and other equipment where a
higher degree availability is
expected, e.
Surge category VI
• Equipment for use near the
power supplies the electrical
installations buildings, between
the principal distribution and the
mains, e.
stationary motors with permanent
connections the permanent
installation.50 1.00 6.g.g.00 2. household appliances,
portable tools, etc. electricity meters, circuit-
breakers and centralised ripple
controllers.
Pollution severity category 2
• Non-conductive pollution only;
occasional condensation may cause
temporary conductivity.00 4.
*) IEC 38
W
Technicalappendix
W.00 2.
Surge category I
• Equipment that intended to
be connected the permanent
electrical installation building. caused by
conductive dust, rain snow.80
230/400
277/480 6.50
400/690 8.00 2. distribution boards,
circuit-breakers, wiring systems
(including cables, busbars, junction
boxes, switches, power sockets)
in the permanent installation,
and equipment for industrial use
and some other equipment, e.50 1.50 0.
Surge category II
• Equipment connected the
permanent electrical installation a
building, e
