EN 60305:1996

SLOVENSKI STANDARD
01-november-1997
Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic or glass
insulator units for a.c. systems - Characteristics of insulator units of the cap and
pin type (IEC 305:1995)
Insulators for overhead lines with a nominal voltage above 1 kV - Ceramic or glass
insulator units for a.c. systems - Characteristics of insulator units of the cap and pin type
Isolatoren für Freileitungen mit einer Nennspannung über 1 kV - Keramik- oder
Glasisolatoren für Wechselpannungssysteme - Kenngrößen von Kappenisolatoren
Isolateurs pour lignes aériennes de tension nominale supérieure à 1 kV - Eléments
d'isolateurs en matière céramique ou en verre pour systèmes à courant alternatif -
Caractéristiques des éléments d'isolateurs du type capot et tige
Ta slovenski standard je istoveten z: EN 60305:1996
ICS:
29.080.10 Izolatorji Insulators
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE
IEC
INTERNATIONAL
Quatrième édition
STANDARD
Fourth edition
1995-12
Isolateurs pour lignes aériennes de tension
nominale supérieure à 1 000 V —
Eléments d'isolateurs en matière céramique
ou en verre pour systèmes à courant alternatif —
Caractéristiques des éléments d'isolateurs
du type capot et tige
Insulators for overhead lines with a nominal
voltage above 1 000 V —
Ceramic or glass insulator units for
a.c. systems —
Characteristics of insulator units of the cap
and pin type
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305 ©IEC:1995 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V -
Ceramic or glass insulator units for a.c. systems -
Characteristics of insulator units of the cap and pin type
FOREWORD
1)
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international co-operation on all questions concerning standardization in the electrical and electronic
fields. To this end and in addition to other activities, the IEC publishes International Standards. Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt
with may participate in this preparatory work. International, governmental and non-governmental organizations
liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters, express as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
form of standards, technical reports or guides and they are accepted by the National Committees in that
sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 305 has been prepared by sub-committee 36B: Insulators for
overhead lines, of IEC technical committee 36: Insulators. This fourth edition cancels and
replaces the third edition published in 1978 of which it constitutes a technical revision in order
to introduce characteristics of cap and pin insulators for polluted areas.
The text of this standard is based on the following documents:
DIS Report on voting
36B/149/RVD
36B/139/DIS
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

305 ©IEC:1995 – 5 –
INSULATORS FOR OVERHEAD LINES
WITH A NOMINAL VOLTAGE ABOVE 1 000 V -
Ceramic or glass insulator units for a.c. systems -
Characteristics of insulator units of the cap and pin type
1 Scope and object
This International Standard applies to string insulator units of the cap and pin type with
insulating parts of ceramic material or glass, intended for a.c. overhead lines with a nominal
voltage greater than 1 000 V and a frequency not greater than 100 Hz. It also applies to
insulators of similar design used in substations.
This standard applies to string insulator units of the cap and pin type either with ball and socket
couplings or with clevis and tongue couplings.
This standard applies to string insulator units for use on overhead lines in clean areas and
polluted areas. For use in areas characterized by very heavy pollution levels and for other
particular or extreme environmental conditions, it may be necessary for certain dimensions to
be changed and insulator units having different creepage distances, spacing and forms may be
preferred (for example, flat profile, hemispherical etc.). Insulators for use on d.c. systems may
also need different dimensions. In any case, it is recommended tha
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