SIST EN 50243:2022
(Main)Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers
Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers
This document is applicable to ceramic insulated outdoor bushings for highest voltages for equipment of 24 kV and 36 kV, with rated currents of 5 kA and 8 kA for insulating liquid filled transformers and frequencies from 15 Hz up to 60 Hz.
This document establishes dimensions to ensure interchangeability and adequate mounting of bushings.
Two types of construction are specified, type A and type B, both types for highest voltages for equipment 24 kV and 36 kV and rated currents of 5 kA and 8 kA. The mechanical stresses of the conductor tube define the difference between type A and type B. The conductor tube of type A is axially and radially fixed in the top of the bushing. The inner line terminal of the transformer can be flexible and without any special support for the lower end of the conductor tube.
For new installations bushings of Type A are expected to be used. Type B bushings can be supplied at the request of a customer.
In case of type B, the conductor tube is only radially fixed in the top of the bushing. In that case, a rigid support is mounted to fix the lower end of the conductor tube (for example, in combination with a drip proofed sealing end). The drip proofed sealing end is often required in the service requirements. In this case, it is not possible to use type A because of the existing double fixation. Therefore, both bushing types A and B are be specified.
The condition for the usage of type B is that the drip-proof sealing end is able to withstand the mechanical stress in axial direction.
Durchführungen für Freiluft, 24 kV und 36 kV sowie 5 kA und 8 kA, für flüssigkeitsgefüllte Transformatoren
Traversées d'extérieur pour 24 kV et 36 kV et pour 5 kA et 8 kA, pour transformateurs remplis de liquide
Le présent document est applicable aux traversées d'extérieur à isolation en matière céramique pour des tensions les plus élevées pour le matériel de 24 kV et 36 kV, avec des courants assignés de 5 kA et 8 kA pour les transformateurs remplis de liquide isolant et des fréquences de 15 Hz à 60 Hz.
Le présent document établit les dimensions pour assurer l'interchangeabilité et le montage correct des traversées.
Deux types de constructions sont spécifiés : le type A et le type B. Ces deux types s'appliquent pour des tensions plus élevées pour le matériel de 24 kV et 36 kV et des courants assignés de 5 kA et 8 kA. Les contraintes mécaniques des tubes conducteurs définissent la différence entre le type A et le type B. Le tube conducteur de type A est fixé de manière axiale et radiale en haut de la traversée. La borne de ligne intérieure du transformateur peut être souple et sans support spécial pour l'extrémité inférieure du tube conducteur.
Pour les nouvelles installations, l'utilisation de traversées de type A est attendue. Des traversées de type B peuvent être fournies à la demande du client.
Dans le cas du type B, le tube conducteur est uniquement fixé de manière radiale en haut de la traversée. Dans ce cas, un support rigide est monté pour fixer l'extrémité inférieure du tube conducteur (en combinaison avec une extrémité scellée étanche, par exemple). L'extrémité étanche est souvent spécifiée dans les exigences de maintenance. Dans ce cas, il n'est pas possible d'utiliser un type A à cause de la double fixation existante. C'est pourquoi les traversées de types A et B sont spécifiées.
La condition pour l'utilisation du type B est que l'extrémité étanche soit capable de résister à la contrainte mécanique axiale.
Skoznjiki za zunanjo montažo 24 kV in 36 kV ter za 5 kA in 8 kA, za transformatorje, napolnjene s tekočino
Ta dokument se uporablja za keramično izolirane skoznjike za zunanjo montažo pri največji napetosti opreme 24 kV in 36 kV, z nazivnim tokom 5 kA in 8 kA za izoliranje transformatorjev, napolnjenih s tekočino, ter s frekvencami od 15 Hz do 60 Hz.
Določa mere za zagotavljanje zamenljivosti in ustrezne montaže skoznjikov.
V dokumentu sta določeni dve vrsti konstrukcije, tip A in tip B, pri čemer se obe uporabljata za največjo napetost opreme 24 kV in 36 kV ter nazivni tok 5 kA in 8 kA. Mehanske obremenitve cevi za vodnike določajo razliko med tipom A in tipom B. Cev za vodnike tipa A je aksialno (osno) in radialno pritrjena na zgornjem delu skoznjika. Notranji linijski zaključni element transformatorja je lahko fleksibilen in brez posebne opore za spodnji del cevi za vodnike.
Pri novih inštalacijah se pričakuje uporaba skoznjikov tipa A. Skoznjike tipa B je mogoče dobaviti na zahtevo stranke.
Pri tipu B je cev za vodnike na zgornjem delu skoznjika pritrjena zgolj radialno. V tem primeru je treba namestiti togo oporo, ki pritrdi spodnji del cevi za vodnike (npr. v kombinaciji s tesnilnim končnikom z zaščito pred kapljanjem). Tesnilni končnik z zaščito pred kapljanjem je pogosto predmet zahtev glede delovanja. V tem primeru zaradi obstoječe dvojne pritrditve ni mogoče uporabiti tipa A, zato sta določena tako skoznjik tipa A kot tipa B.
Pogoj za uporabo tipa B je, da tesnilni končnik z zaščito pred kapljanjem lahko prenese mehansko obremenitev v aksialni (osni) smeri.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50243:2022
01-oktober-2022
Nadomešča:
SIST EN 50243:2004
Skoznjiki za zunanjo montažo 24 kV in 36 kV ter za 5 kA in 8 kA, za
transformatorje, napolnjene s tekočino
Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers
Durchführungen für Freiluft, 24 kV und 36 kV sowie 5 kA und 8 kA, für flüssigkeitsgefüllte
Transformatoren
Traversées d'extérieur pour 24 kV et 36 kV et pour 5 kA et 8 kA, pour transformateurs
remplis de liquide
Ta slovenski standard je istoveten z: EN 50243:2022
ICS:
29.080.20 Skoznjiki Bushings
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 50243:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50243:2022
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SIST EN 50243:2022
EUROPEAN STANDARD EN 50243
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2022
ICS 29.080.20; 29.180 Supersedes EN 50243:2002
English Version
Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for
liquid filled transformers
Traversées d'extérieur pour 24 kV et 36 kV et pour 5 kA et Durchführungen für Freiluft, 24 kV und 36 kV sowie 5 kA
8 kA, pour transformateurs remplis de liquide und 8 kA, für flüssigkeitsgefüllte Transformatoren
This European Standard was approved by CENELEC on 2022-06-20. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50243:2022 E
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SIST EN 50243:2022
EN 50243:2022 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 Requirements . 5
4.1 General Requirements . 5
4.2 Ratings . 5
4.2.1 Standard values of highest voltage for equipment (Um) . 5
4.2.2 Standard values of rated current (I ) . 5
r
4.3 Common dimensions and creepage distances of bushings type A and type B . 5
4.4 Parts list according to bushing type A . 8
4.5 Parts list according to bushing type B . 9
Annex A (normative) Detail drawings of components . 10
A.1 General . 10
A.2 Insulator (Item N° 1) . 11
A.3 Conductor tube (Item N° 2) . 15
A.4 Upper cap (Item N° 4) . 16
A.5 Lower cap (Item N° 6) . 16
A.6 Nut (Item N° 3) . 17
A.7 Sealing ring (Item N° 5) . 18
A.8 Flat gasket (Item N° 9) . 18
A.9 Flat gasket (Item N° 18) . 18
A.10 Clamping ring (Item N° 16) . 19
A.11 Interlayer (Item N° 13) . 19
A.12 Compression ring (Item N° 11) . 20
A.13 Retaining ring (Item N° 12) . 21
A.14 Flat gasket (Item N° 10) . 21
A.15 Clamping paw (Item N° 17). 22
Annex B (normative) Vertical connecting flags . 23
B.1 General . 23
B.2 Vertical connecting flags – 5 000 A type TP78-120 . 23
B.3 Vertical connecting flags – 8 000 A – type TP78-180 . 24
Bibliography . 26
2
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SIST EN 50243:2022
EN 50243:2022 (E)
European foreword
This document (EN 50243:2022) has been prepared by CLC/TC 36A “Insulated bushings”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-06-20
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-06-20
conflicting with this document have to be
withdrawn
This document will supersede EN 50243:2002 and all of its amendments and corrigenda (if any).
EN 50243:2022 includes the following significant technical change(s) with respect to EN 50243:2002:
— Addition of the highest pollution class.
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
3
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SIST EN 50243:2022
EN 50243:2022 (E)
1 Scope
This document is applicable to ceramic insulated outdoor bushings for highest voltages for equipment of 24 kV
and 36 kV, with rated currents of 5 kA and 8 kA for insulating liquid filled transformers and frequencies from
15 Hz up to 60 Hz.
This document establishes dimensions to ensure interchangeability and adequate mounting of bushings.
Two types of construction are specified, type A and type B, both types for highest voltages for equipment
24 kV and 36 kV and rated currents of 5 kA and 8 kA. The mechanical stresses of the conductor tube define
the difference between type A and type B. The conductor tube of type A is axially and radially fixed in the top
of the bushing. The inner line terminal of the transformer can be flexible and without any special support for
the lower end of the conductor tube.
For new installations bushings of Type A are expected to be used. Type B bushings can be supplied at the
request of a customer.
In case of type B, the conductor tube is only radially fixed in the top of the bushing. In that case, a rigid
support is mounted to fix the lower end of the conductor tube (for example, in combination with a drip proofed
sealing end). The drip proofed sealing end is often required in the service requirements. In this case, it is not
possible to use type A because of the existing double fixation. Therefore, both bushing types A and B are
specified.
The condition for the usage of type B is that the drip-proof sealing end is able to withstand the mechanical
stress in axial direction.
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.
EN 12165:2016, Copper and copper alloys — Wrought and unwrought forging stock
EN 60137, Insulated bushings for alternating voltages above 1 000 V (IEC 60137)
EN 60672-3, Ceramic and glass-insulating materials — Part 3: Specifications for individual materials (IEC
60672-3)
EN 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment
with rated voltages greater than 1 000 V (IEC 62155)
EN ISO 286-2, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —
Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts (ISO 286-2)
EN ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
orientation, location and run-out (ISO 1101)
EN ISO 21920-1, Geometrical product specifications (GPS) — Surface texture: Profile — Part 1: Indication of
surface texture (ISO 21920-1)
IEC/TS 60815 (all parts), Selection and dimensioning of high-voltage insulators intended for use in polluted
conditions
ISO 261, ISO general purpose metric screw threads — General plan
ISO 2768-1, General Tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
4
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SIST EN 50243:2022
EN 50243:2022 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
bushing type A
bushing with a conductor tube which is axially and radially fixed in the top of the bushing
3.2
bushing type B
bushing with a conductor tube which is only radially fixed in the top of the bushing
4 Requirements
4.1 General requirements
Bushings specified by this document shall be installed with the transformer side of the bushing fully immersed
in insulating liquid and the other end in air.
Bushings shall meet the requirements of EN 60137.
4.2 Ratings
4.2.1 Standard values of highest voltage for equipment (U )
m
The value of U of a bushing shall be chosen from the standard values of the highest voltage for transformers
m
given below in kilovolts:
24 - 36
4.2.2 Standard values of rated current (I )
r
The value I of a bushing shall be chosen from the standard values given below in amperes:
r
5 000 – 8 000
4.3 Common dimensions and creepage distances of bushings type A and type B
The common dimensions of bushings type A and type B shall be as specified in Figure 1 and Table 1.
The details of the components are given in Annex A.
The provisions for arcing horns should be made if required.
In case of environmental conditions, which do not require site pollution sever
...
SLOVENSKI STANDARD
oSIST prEN 50243:2021
01-september-2021
Zunanji skoznjiki za 24 kV in 36 kV ter za 5 kA in 8 kA, za transformatorje,
napolnjene s tekočino
Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for liquid filled transformers
Durchführungen für Freiluft, 24 kV und 36 kV sowie 5 kA und 8 kA, für flüssigkeitsgefüllte
Transformatoren
Traversées d'extérieur pour 24 kV et 36 kV et pour 5 kA et 8 kA, pour transformateurs
remplis de liquide
Ta slovenski standard je istoveten z: prEN 50243
ICS:
29.080.20 Skoznjiki Bushings
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN 50243:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50243:2021
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oSIST prEN 50243:2021
EUROPEAN STANDARD DRAFT
prEN 50243
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS Will supersede EN 50243:2002 and all of its
amendments and corrigenda (if any)
English Version
Outdoor bushings for 24 kV and 36 kV and for 5 kA and 8 kA, for
liquid filled transformers
Traversées d'extérieur pour 24 kV et 36 kV et pour 5 kA et Durchführungen für Freiluft, 24 kV und 36 kV sowie 5 kA
8 kA, pour transformateurs remplis de liquide und 8 kA, für flüssigkeitsgefüllte Transformatoren
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-09-24.
It has been drawn up by CLC/TC 36A.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 72151 Ref. No. prEN 50243 E
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oSIST prEN 50243:2021
prEN 50243:2021 (E)
12 Contents Page
13 European foreword . 3
14 1 Scope . 4
15 2 Normative references . 4
16 3 Terms and definitions . 5
17 4 Requirements . 5
18 4.1 General Requirements . 5
19 4.2 Ratings . 5
20 4.2.1 Standard values of highest voltage for equipment (U ) . 5
m
21 4.2.2 Standard values of rated current (I ) . 5
r
22 4.3 Common dimensions and creepage distances of bushings type A and type B . 5
23 4.4 Parts list according to bushing type A . 8
24 4.5 Parts list according to bushing type B . 9
25 Annex A (normative) Detail drawings of components . 10
26 A.1 General . 10
27 A.2 Insulator (Item N° 1) . 11
28 A.3 Conductor tube (Item N° 2) . 15
29 A.4 Upper cap (Item N° 4) . 16
30 A.5 Lower cap (Item N° 6) . 16
31 A.6 Nut (Item N° 3) . 17
32 A.7 Sealing ring (Item N° 5) . 17
33 A.8 Flat gasket (Item N° 9) . 17
34 A.9 Flat gasket (Item N° 18) . 18
35 A.10 Clamping ring (Item N° 16) . 18
36 A.11 Interlayer (Item N° 13) . 19
37 A.12 Compression ring (Item N° 11) . 19
38 A.13 A.12 Retaining ring (Item N° 12) . 20
39 A.14 Flat gasket (Item N° 10) . 21
40 A.15 Clamping paw (Item N° 17) . 22
41 Annex B (normative) Vertical connecting flags . 23
42 B.1 General . 23
43 B.2 Vertical connecting flags – 5 000 A type TP78-120 . 23
44 B.3 Vertical connecting flags – 8 000 A – type TP78-180 . 24
45 Bibliography . 26
2
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oSIST prEN 50243:2021
prEN 50243:2021 (E)
46 European foreword
47 This document (prEN 50243:2021) has been prepared by CLC/TC 36A “Insulated bushings”.
48 This document is currently submitted to the Enquiry.
49 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
50 This document will supersede EN 50243:2002 and all of its amendments and corrigenda (if any).
3
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oSIST prEN 50243:2021
prEN 50243:2021 (E)
51 1 Scope
52 This document is applicable to ceramic insulated outdoor bushings for highest voltages for equipment of 24 kV
53 and 36 kV, with rated currents of 5 kA and 8 kA for insulating liquid filled transformers and frequencies from
54 15 Hz up to 60 Hz.
55 This document establishes dimensions to ensure interchangeability and adequate mounting of bushings.
56 Two types of construction are specified, type A and type B, both types for highest voltages for equipment
57 24 kV and 36 kV and rated currents of 5 kA and 8 kA. The mechanical stresses of the conductor tube define
58 the difference between type A and type B. The conductor tube of type A is axially and radially fixed in the top
59 of the bushing. The inner line terminal of the transformer can be flexible and without any special support for
60 the lower end of the conductor tube.
61 For new installations bushings of Type A are expected to be used. Type B bushings can be supplied at the
62 request of a customer.
63 In case of type B, the conductor tube is only radially fixed in the top of the bushing. In that case, a rigid
64 support is mounted to fix the lower end of the conductor tube (for example, in combination with a drip proofed
65 sealing end). The drip proofed sealing end is often required in the service requirements. In this case, it is not
66 possible to use type A because of the existing double fixation. Therefore, both bushing types A and B are be
67 specified.
68 The condition for the usage of type B is that the drip-proof sealing end is able to withstand the mechanical
69 stress in axial direction.
70 2 Normative references
71 The following documents are referred to in the text in such a way that some or all of their content constitutes
72 requirements of this document. For dated references, only the edition cited applies. For undated references,
73 the latest edition of the referenced document (including any amendments) applies.
74 EN 1652, Copper and copper alloys - Plate, sheet, strip and circles for general purposes
75 EN 12165:2016, Copper and copper alloys - Wrought and unwrought forging stock
76 EN 13600, Copper and copper alloys - Seamless copper tubes for electrical purposes
77 EN 60137, Insulated bushings for alternating voltages above 1 000 V (IEC 60137)
78 EN 60672-3, Ceramic and glass-insulating materials - Part 3: Specifications for individual materials
79 (IEC 60672-3)
80 IEC TR 60815, Guide for the selection of insulators in respect of polluted conditions
81 IEC 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment
82 with rated voltages greater than 1 000 V
83 ISO 261, ISO general purpose metric screw threads — General plan
84 ISO 286-2, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —
85 Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts
86 ISO 1101, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,
87 orientation, location and run-out
88 ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
89 documentation
4
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oSIST prEN 50243:2021
prEN 50243:2021 (E)
90 ISO 2768, General Geometrical Tolerances and Technical Drawings
91 3 Terms and definitions
92 For the purposes of this document, the following terms and definitions apply.
93 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
94 — ISO Online browsing platform: available at https://www.iso.org/obp
95 — IEC Electropedia: available at https://www.electropedia.org/
96 3.1
97 bushing type A
98 bushing with a conductor tube which is axially and radially fixed in the top of the bushing
99 3.2
100 bushing type B
101 bushing with a conductor tube which is only radially fixed in the top of the bushing
102 4 Requirements
103 4.1 General Requirements
104 Bushings specified by this document shall be installed with the transformer side of the bushing fully immersed
105 in insulating liquid and the other end in air.
106 Bushings shall meet the requirements of EN 60137.
107 4.2 Ratings
108 4.2.1 Standard values of highest voltage for equipment (U )
m
109 The value of U of a bushing shall be chosen from the standard values of the highest voltage for transformers
m
110 given below in kilovolts:
111 24 - 36
112 4.2.2 Standard values of rated current (I )
r
113 The value I of a bushing shall be chosen from the standard values given below in amperes:
r
114 5 000 – 8 000
115 4.3 Common dimensions and creepage distances of bushings type A and type B
116 The common dimensions of bushings type A and type B shall be as specified in Figure 1 and Table 1.
117 The details of the components are given in Annex A.
118 The provisions for arcing horns should be made if required.
119 In case of environmental conditions, which do not require pollution level II or more according to IEC TR 60815,
120 an insulator with a reduced creepage distance can be agreed between the purchaser and the manufacturer
121 with
...
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