IEC 60305:1995 pdf download

IEC 60305:1995 pdf download.Insulators for overhead lines with a nominal voltage above 1 000 V Ceramic or glass insulator units for ac. systems Characteristics of insulator units of the cap and pin type.
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 ma.imum 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.
IEC 60305 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.
IEC 60305 applies to string insulator units of the cap and pin type either with baB and socket couplings or with clevis and tongue couplings.
IEC 60305 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 that the standardized mechanical characteristics of the present International Standard and coupling sizes are retained.
Except for nominal spacing, tolerances for dimensions indicated in lEG 383-1 are applicable to all nominal values including maximum nominal diameter and minimum nominal creepage distance values given in tables I and 2.
Nominal spacing tolerance shall be:
± (0,03 P+ 03) mm.IEC-60305-1995

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