Insulators for overhead lines - Composite line post insulators for AC systems with a nominal voltage greater than 1 000 V - Part 1: Definitions, end fittings and designations

This part of IEC 61952 is applicable to composite line post insulators for AC overhead lines with a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz. It also applies to line post insulators of similar design used in substations or on electric traction lines. This document applies to line post insulators of composite type, generally with metallic couplings, with and without a base plate. It also applies to such insulators when used in complex structures. It does not apply to hollow insulators adapted for use as line post insulators. The object of this document is to specify the main dimensions of the couplings to be used on the composite line post insulators in order to permit the assembly of insulators or fittings supplied by different manufacturers and to allow, whenever practical, interchangeability with existing installations. It also specifies a standard designation system for composite line post insulators.

Isolatoren für Freileitungen - Verbund-Freileitungsstützer für Wechselstromsysteme mit einer Nennspannung über 1 000 V - Teil 1: Begriffe, Endarmaturen und Bezeichnungen

Isolateurs pour lignes aériennes - Isolateurs composites rigides à socle pour systèmes à courant alternatif de tension nominale supérieure à 1 000 V - Partie 1 : définitions, des armatures d'extrémité et désignations

l’IEC 61952-1:2019 s’applique aux isolateurs composites rigides à socle pour lignes aériennes à courant alternatif de tension nominale supérieure à 1 000 V et de fréquence ne dépassant pas 100 Hz.Elle s’applique également aux isolateurs rigides à socle de conception similaire utilisés dans les postes ou sur les lignes de traction électrique. Le présent document s’applique aux isolateurs rigides à socle de type composite, comportant généralement des couplages métalliques, équipés ou non de plaque de base. Il s’applique également à ces isolateurs lorsqu’ils sont utilisés dans des structures complexes. Il ne s’applique pas aux isolateurs creux adaptés pour être utilisés comme isolateurs rigides à socle. L’objet du présent document est de spécifier les principales dimensions des couplages à utiliser sur les isolateurs composites rigides à socle afin de permettre l’assemblage d’isolateurs ou d’armatures fourni(e)s par différents fabricants et de permettre, dans la mesure du possible, l’interchangeabilité avec les installations existantes.

Izolatorji za nadzemne vode - Kompozitni linijski podporni izolatorji za izmenične sisteme z nazivno napetostjo nad 1000 V - 1. del: Definicije, končni priključki in označevanje (IEC 61952-1:2019)

Ta dokument se uporablja za kompozitne linijske podporne izolatorje za izmenične nadzemne vode z nazivno napetostjo nad 1000 V in frekvenco, ki ne presega 100 Hz. Uporablja se tudi za linijske podporne izolatorje podobne zasnove, uporabljene v podpostajah ali električnih vlečnih vodih. Dokument se uporablja za kompozitne linijske podporne izolatorje, običajno s kovinskimi spojkami, z osnovno ploščo in brez nje. Uporablja se tudi za izolatorje v kompleksnih konstrukcijah. Ne uporablja se za votle izolatorje, ki so prilagojeni za uporabo kot linijski podporni izolatorji. Namen tega dokumenta je opredeliti glavne mere spojk, ki se uporabljajo na kompozitnih podpornih izolatorjih, da se omogoči sestava izolatorjev ali spojk, ki jih dobavljajo različni proizvajalci, in da se omogoči, če je to izvedljivo, medsebojna zamenljivost z obstoječimi inštalacijami. Opredeljuje tudi standardni sistem označevanja za kompozitne linijske podporne izolatorje.

General Information

Status
Published
Publication Date
06-Jun-2019
Current Stage
6060 - Document made available
Due Date
07-Jun-2019
Completion Date
07-Jun-2019

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SLOVENSKI STANDARD
SIST EN IEC 61952-1:2019
01-december-2019

Izolatorji za nadzemne vode - Kompozitni linijski podporni izolatorji za izmenične

sisteme z nazivno napetostjo nad 1000 V - 1. del: Definicije, končni priključki in

označevanje (IEC 61952-1:2019)

Insulators for overhead lines - Composite line post insulators for AC systems with a

nominal voltage greater than 1 000 V - Part 1: definitions, end fittings and designations

(IEC 61952-1:2019)

Isolatoren für Freileitungen - Verbund-Freileitungsstützer für Wechselstromsysteme mit

einer Nennspannung über 1 000 V - Teil 1: Begriffe, Endarmaturen und Bezeichnungen

(IEC 61952-1:2019)

Isolateurs pour lignes aériennes - Isolateurs composites rigides à socle pour systèmes à

courant alternatif de tension nominale supérieure à 1 000 V - Partie 1 : définitions, des

armatures d'extrémité et désignations (IEC 61952-1:2019)
Ta slovenski standard je istoveten z: EN IEC 61952-1:2019
ICS:
29.080.10 Izolatorji Insulators
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN IEC 61952-1:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 61952-1:2019
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SIST EN IEC 61952-1:2019
EUROPEAN STANDARD EN IEC 61952-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2019
ICS 29.080.10; 29.240.20
English Version
Insulators for overhead lines - Composite line post insulators for
AC systems with a nominal voltage greater than 1 000 V - Part 1:
definitions, end fittings and designations
(IEC 61952-1:2019)

Isolateurs pour lignes aériennes - Isolateurs composites Isolatoren für Freileitungen - Verbund-Freileitungsstützer für

rigides à socle pour systèmes à courant alternatif de Wechselstromsysteme mit einer Nennspannung über 1 000

tension nominale supérieure à 1 000 V - Partie 1 : V - Teil 1: Begriffe, Endarmaturen und Bezeichnungen

définitions, des armatures d'extrémité et désignations (IEC 61952-1:2019)
(IEC 61952-1:2019)

This European Standard was approved by CENELEC on 2019-05-09. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61952-1:2019 E
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SIST EN IEC 61952-1:2019
EN IEC 61952-1:2019 (E)
European foreword

The text of document 36/435/FDIS, future edition 1 of IEC 61952-1, prepared by IEC/TC 36

"Insulators" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC 61952-1:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-02-09

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-05-09

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61952-1:2019 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 61952-1:2019
EN IEC 61952-1:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-471 - International Electrotechnical Vocabulary - Part 471: - -
Insulators
IEC 60071-1 - Insulation co-ordination - Part 1: Definitions, EN 60071-1 -
principles and rules

IEC 61952 2008 Insulators for overhead lines - Composite line post EN 61952 2008

insulators for A.C. systems with a nominal voltage
greater than 1 000 V - Definitions, test methods and
acceptance criteria
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SIST EN IEC 61952-1:2019
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SIST EN IEC 61952-1:2019
IEC 61952-1
Edition 1.0 2019-04
INTERNATIONAL
STANDARD
Insulators for overhead lines – Composite line post insulators for AC systems
with a nominal voltage greater than 1 000 V –
Part 1: definitions, end fittings and designations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.080.10; 29.240.20 ISBN 978-2-8322-6511-6

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
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SIST EN IEC 61952-1:2019
– 2 – IEC 61952-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Mechanical, dimensional and electrical characteristics .................................................... 7

Characteristics ........................................................................................................ 7

Maximum design cantilever load (MDCL) and specified cantilever load (SCL) ......... 8

Minimum lightning impulse withstand voltage class (BIL) ........................................ 8

Standard coupling codes ......................................................................................... 8

Standard base-plate codes ................................................................................... 18

5 Line post insulator designation ...................................................................................... 22

6 Marking ......................................................................................................................... 23

Bibliography .......................................................................................................................... 32

Table 1 – Types of couplings .................................................................................................. 9

Table 2 – Types of base plates ............................................................................................. 19

Table 3 – Designation and characteristic of composite Line post insulators (IEC

practice) for IEC 60815-3, Class b ........................................................................................ 24

Table 4 – Designation and characteristic of composite line post insulators (ANSI

practice) ............................................................................................................................... 28

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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSULATORS FOR OVERHEAD LINES – COMPOSITE LINE
POST INSULATORS FOR AC SYSTEMS WITH A NOMINAL
VOLTAGE GREATER THAN 1 000 V –
Part 1: Definitions, end fittings and designations
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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 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 IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61952-1 has been prepared by IEC technical committee 36:

Insulators.
The text of this standard is based on the following documents:
FDIS Report on voting
36/435/FDIS 36/441/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 61952 series, published under the general title Insulators for

overhead lines – Composite line post insulators for AC systems with a nominal voltage greater

than 1 000 V, can be found on the IEC website.
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SIST EN IEC 61952-1:2019
– 4 – IEC 61952-1:2019 © IEC 2019

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 5 –
INTRODUCTION

This part of IEC 61952 is intended to give the main mechanical and dimensional characteristics

of composite line post insulators and their fittings in order to ensure their interchangeability.

Since line post insulators are usually subjected to combined loads (for example vertical due to

the conductor plus compressive and lateral due to the pole being at a line corner or turn), only

the MDCL is given as a specified characteristic for the mechanical strength of the insulator.

Furthermore, composite line post insulators are often used in a braced configuration for higher

voltages and mechanical loads. In these configurations the overall strength depends on the

components and geometry of the whole assembly – including notably the buckling strength of

the line post component which depends more on the core dimensions and flexibility than on

ultimate flexural strength.

In order to address the matter of the strength of composite line post insulators under combined

or complex loads some information is already given in Annex B of IEC 61952:2008 and by the

IEEE [2] . It is intended to expand on this information in a second part of IEC 61952 which will

give application guidelines and examples for common line post usage scenarios.
____________
Numbers in square brackets refer to the bibliography.
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SIST EN IEC 61952-1:2019
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INSULATORS FOR OVERHEAD LINES – COMPOSITE LINE
POST INSULATORS FOR AC SYSTEMS WITH A NOMINAL
VOLTAGE GREATER THAN 1 000 V –
Part 1: Definitions, end fittings and designations
1 Scope

This part of IEC 61952 is applicable to composite line post insulators for AC overhead lines with

a nominal voltage greater than 1 000 V and a frequency not greater than 100 Hz.

It also applies to line post insulators of similar design used in substations or on electric traction

lines.

This document applies to line post insulators of composite type, generally with metallic

couplings, with and without a base plate. It also applies to such insulators when used in complex

structures. It does not apply to hollow insulators adapted for use as line post insulators.

The object of this document is to specify the main dimensions of the couplings to be used on

the composite line post insulators in order to permit the assembly of insulators or fittings

supplied by different manufacturers and to allow, whenever practical, interchangeability with

existing installations.

It also specifies a standard designation system for composite line post insulators.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60050-471, International Electrotechnical Vocabulary – Part 471: Insulators

IEC 60071-1, Insulation co-ordination – Part 1: Definitions, principles and rules

IEC 61952:2008, Insulators for overhead lines – Composite line post insulators for A.C. systems

with a nominal voltage greater than 1 000 V – Definitions, test methods and acceptance criteria

3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-471 and

IEC 61952 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 7 –
3.1
coupling

part of the end fitting designed for attachment of the composite line post insulator to line

equipment, supporting structures, base plates or other insulators
3.2
core diameter
nominal diameter of the load-bearing core of the insulator
3.3
line end fitting

fitting at the end of the line post insulator to which the conductor or other live equipment is to

be attached
Note 1 to entry: Line end fitting can be from metal or insulating material.
3.4
base end fitting

fitting at the end intended to be attached to the supporting structure, either directly or by an

intermediate base or plate
3.5
base

intermediate hardware to allow attachment of the line post insulator to the supporting structure

3.6
reference cantilever load
RCL
North American practise for defining maximum admissible working load
3.7
maximum design cantilever load
MDCL

load level above which damage to the core begins to occur and which is the ultimate limit for

service loads. This value and direction of the load are specified by the manufacturer

3.8
minimum lightning impulse withstand voltage
BIL
impulse voltage having a front time of 1,2 µs and a time to half-value of 50 µs
4 Mechanical, dimensional and electrical characteristics
4.1 Characteristics

Composite line post insulators are standardised by the following specified characteristics:

• maximum design cantilever load (MDCL);
• minimum lightning impulse withstand voltage (BIL);
• standard coupling codes;
• standard base plate code (if applicable).

Additional mechanical characteristics may be required for some applications (e.g. tensile

strength, torsion strength). These characteristics do not form part of this document.

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SIST EN IEC 61952-1:2019
– 8 – IEC 61952-1:2019 © IEC 2019

Core diameter does not form part of the specified characteristics of composite line post

insulators; however some fitting dimensions depend on the core diameter. Common nominal

core diameters (in mm) are as follows: 37, 40, 45, 51, 63, 76, 88, 102, 120, 130.

Creepage distance does not form part of the specified characteristics of composite line post

insulators; however it may be included in the insulator designation.

All dimensions are expressed in millimetres. The dimensions apply to the finished product after

any surface treatment.
4.2 Maximum design cantilever load (MDCL) and specified cantilever load (SCL)
Each insulator is characterised by the MDCL and SCL as defined in IEC 61952.

The manufacturer’s recommended working cantilever load may be listed as the MDCL or the

reference cantilever load (RCL) and may be as much as 50 % of the SCL.
4.3 Minimum lightning impulse withstand voltage class (BIL)

Composite line post insulators are divided into classes according to their standard rated

lightning impulse withstand voltage according to IEC 60071-1. For convenience, the standard

values (in kV) are reproduced as follows:

60, 75, 95, 125, 145, 170, 200, 250, 325, 380, 450, 550, 650, 750, 850, 950, 1 050,

1 175, 1 300, 1 425, 1 550, 1 675, 1 800, 1 950, 2 100, 2 550, 2 700.
NOTE Intermediate values are permitted and given in Tables 3 and 4.

Each class includes insulators of increasing length up to the next lightning impulse withstand

voltage class.
4.4 Standard coupling codes

The couplings on composite line post insulators are designated by the codes given in Table 1.

The typical major dimensions defining each size are indicated.

Unless otherwise specified, dimensions given in Table 1 are nominal and subject to the typical

tolerances applicable to the type (threads, metric thread pitch – standard, cast elements, etc.).

Metric bolts and tapping may be replaced by their UNC equivalent; this shall be clearly marked

on all drawings. All dimensions are expressed in millimetres.
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IEC 61952-1:2019 © IEC 2019 – 9 –
Table 1 – Types of couplings
DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
A Tapped X X
flange
IEC
A B C
100 M12 x 16
∅ 76
160 M16 x 20
∅ 127
160 ∅ 127 M16 x 24
165 M16 x 20
∅ 127
165 M20 x 24
∅ 127
165 ∅ 127 M24 x 30
165 ∅ 178 M24 x 30
Oversized thread
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SIST EN IEC 61952-1:2019
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
B Stud X
pedestal
A B
7 M16 x 20
10 M20 x 24
12 M22 x 25
10 M24 x 30
IEC
C Clevis X X
Often used
with swivel
base “S”,
IEC
A B C
14 20 min.
∅ 24
16 20 min.
∅ 20
16 20 min. ∅ 24
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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 11 –
DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
D Square X X
flange
IEC
A B C D
165 200 23 ∅ 18
I Integrated X
base(s)
IEC
A B C D
357 249 61
∅ 22
355 254 50 ∅ 22
NOTE The base can be curved or flat.
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SIST EN IEC 61952-1:2019
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
J Integrated X
clamp
IEC
A B C
100 – 1750 40 – 160
∅ 7 – 38
K Horizontal X
trunnion
fitting
IEC
A B C
100 – 103 25,4 min ∅ 17,5 – 21
NOTE Details of gauges for the K fitting are given in
IEC 60720.
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IEC 61952-1:2019 © IEC 2019 – 13 –
DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
L Tongue (or X
blade)
IEC
R B
25,4 16
25,4 19
25,4 25
NOTE Other dimensions are not given since they are
variable
M MK neck X
IEC
A B C R D E
26 25 51 12,5 ∅ 76 ∅ 21
34 28 64 16
∅ 76 ∅ 31
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
N “tie-top”
IEC
A B R1 D R2
57 44±3 13-18 13-18
73 57±3 25 18±4 25
79 50±3 13-18 25
100 73±3 25 17±3 25
102 78±2 25 14
124 73±3 20 18±4 20
124 84±3 25,4 25,4
140 120±4 25 24 16
It is also permissible to have a hole for the fixing wire with
different diameters.
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IEC 61952-1:2019 © IEC 2019 – 15 –
DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
P Through
X X
holes flange
IEC
A B C1 C2
100 16 ∅ 76
160 16
∅ 127
160 20
∅ 127 ∅18
160 18 ∅ 127
165 20 ∅ 127
230 20
∅ 178 ∅ 18 – 22
250 20
∅ 190 ∅ 18 – 22
260 17
20 ∅ 225 ∅ 18
312 25
∅ 254 ∅ 18-26
312 25
∅ 275 ∅ 18
360 25 ∅ 300 ∅ 26
NOTE Number of fixing holes can vary between 4 to 8.
Q Anchor, X
square base
(Usually
used in a
bendable
base)
IEC
NOTE Dimensions are not given since they are variable
and are determined by the base into which the fitting is
mounted.
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
R Stud X
IEC
M12 x 16
M16 x 20
M20 x 24
M24 x 30
M33 x 40
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
S Slotted or
drop hole
tongue
IEC
A B
25,4 x 38 16
25,4 x 38 19
25,4 x 38 25
Reference ANSI C29.17 for dimensional details.
NOTE Radii are not given since they are variable.
T Single hole X X
tongue
IEC
A B
19,5 max. ∅ 20
19,5 max. ∅ 24
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DESIGNATION TYPE OF Examples Usual
COUPLING practice
(non preferred values in brackets)
Line Base
End end
U Universal
X X
trunnion
fitting
IEC
Typical conductor diameter range “A” is 7,0 mm to 38 mm.
V Vertical X
trunnion
fitting
IEC
A B
100 – 103 25,4 min
NOTE Details of gauges for the V fitting are given in
IEC 60720.
Z Non- N/A X X
standard
coupling
4.5 Standard base-plate codes

Composite line post insulators may be supplied with an integral or fitted base plate. Table 2

gives the designations of common base plates.
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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 19 –
Table 2 – Types of base plates
DESIGNATION TYPE OF Examples Appli
COUPLING cable
(non preferred values in brackets)
base
end
fittings
N No base N/A
plate
B Flat Q
Bendable
base
IEC
α = 0° – 17°
A B C D1 D2
(for slotted versions)
254 A+51 (155) 203 D1
∅ 21 – 25.4
330 A+51 229 ∅ (22) 24 D1
356 A+51 229 D1
∅ 24 – 28
381 A+51 254 ∅ 24 – 32 D1
F Flat fixed
A, P
base plate
IEC
A B C D1 D2 E
254 305 203 ∅ 21 – 24 or slot D1 ∅ 127
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SIST EN IEC 61952-1:2019
– 20 – IEC 61952-1:2019 © IEC 2019
DESIGNATION TYPE OF Examples Appli
COUPLING cable
(non preferred values in brackets)
base
end
fittings
G Curved/ A, P, B
Gain fixed
base plate
IEC
A C1 C2 Pole dia
(D1 – D2)
254 -
∅ 21 or 22 ∅ 172 – ∅ 254
(305)
305 ∅ 24 C1 x 38(32) 172 – ∅ 254
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SIST EN IEC 61952-1:2019
IEC 61952-1:2019 © IEC 2019 – 21 –
DESIGNATION TYPE OF Examples Appli
COUPLING cable
(non preferred values in brackets)
base
end
fittings
H Gain Q
Bendable
base
IEC
α = 0° – 17°
A D1 S1 Typical pole
diameter range
254 (21) 24(25.4) D1 x 38 (32)
∅ 178 – 356
280 (24) 27 D1 x 38 ∅ 178 – 356
305 24 – 27 D1 x 38 ∅ 178 – 356
356 (24) 27 D1 x 38
∅ 178 – 356
356 27 x 38 D1 ∅ 178 – 356
S Swivel C, L
IEC
NOTE Dimensions are not given since they are variable.
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SIST EN IEC 61952-1:2019
– 22 – IEC 61952-1:2019 © IEC 2019
DESIGNATION TYPE OF Examples Appli
COUPLING cable
(non preferred values in brackets)
base
end
fittings
V Vertical Q
Bendable
IEC
A B
356-1219 203-4
Z Non- N/A
standard
base plate
NOTE Metric Conversions:

1 inch = 25,4 mm, rounded off to the nearest whole number for dimensions greater than or equal to 1 inch. For

dimensions, less than 1 inch, round off to the nearest tenth.

3-inch bolt circle – 4 tapped holes,1/2 inch – 13 unified from special pitch diameter 0,4715-0,4650, Length of

engagement, 0,50 (tap after hot dip galvanizing).

5-inch bolt circle – 4 tapped holes, 5/8 inch – 11 unified from special pitch diameter 0,5882-0,5810, Length of

engagement, 0,625 (tap after hot dip galvanizing).
5 Line post insulator designation

Line post insulators are designated by letters CLP followed by a number indicating the MDCL

of the insulator, expressed in kN. This designation is then followed by the minimum lightning

impulse withstand voltage separated by a dash. The next letter T, P, etc. specifies the type of

line end fitting coupling, as shown in Table 1, this is followed by the base end fitting code and

then by the base plate code according to Table 2. This is then followed by the creepage distance

separated by a dash.

If the insulator is designed for inverted mounting (e.g. jumper support insulators) this may be

noted by adding the code “INV” to the end of the designation.
EXAMPLE:
CLP6.5-550TPG-2350 is a Composite Line Post insulator with an MDCL
...

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