EN 50180-2:2015

• Abstract:

  This European Standard should be considered in factual context with EN 50180 only. The dimensional supplements are related to figures and tables of EN 50180. To enable a better understanding of additional information some tables from EN 50180 are used and extended. This European Standard may now be used also for bushings with a highest voltage of 52 kV. Figures for the details of the components and the related tables are added according to the extended range of voltage.

• Status: Published
• Publication Date: 08-Oct-2015
• Withdrawal Date: 09-Aug-2018
• ICS: 29.080.20 - Bushings
• Technical Committee: CLC/TC 36A - Insulated bushings
• Drafting Committee: CLC/TC 36A - Insulated bushings
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 30-Apr-2025
• Completion Date: 25-Aug-2026
• Ref Project: SIST EN 50180-2:2016 - Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers - Part 2: Requirement for bushing components

• Referred By: EN 50708-2-3:2022 - Power transformers - Additional European requirements - Part 2-3: Medium power transformer - Accessories
• Effective Date: 03-Feb-2026

Overview

EN 50180-2:2015 (CLC/CENELEC) is Part 2 of the European standard series for bushings above 1 kV up to 52 kV and rated currents from 250 A to 3,15 kA for liquid‑filled transformers. It supplements EN 50180-1 by specifying requirements for bushing components, adding dimensional details, figures and tables (including an extended range up to 52 kV) to ensure clarity and interchangeability of parts previously covered by withdrawn DIN standards.

Key topics and technical requirements

• Component lists and designations for open‑type bushings across current classes (250 A, 630 A, 1 250 A, 2 000 A, 3 150 A) and voltages (12 kV–36 kV and extended to 52 kV).
• Illustrated parts and dimensional supplements: terminal studs, caps, gaskets, spacers, packing, compression rings, clamping rings, potential rings and related items are shown in figures and tables referenced to EN 50180-1.
• Materials and tolerances: references to copper and copper‑alloy standards (EN 12164, EN 1652, EN 13601), surface and geometric tolerances (EN 22768 / ISO 2768), and specific material notes (e.g., CW614N / CW617N / Cu‑ETP options where applicable).
• Sealing and elastomer requirements: gasket and packing materials described as insulating‑liquid resistant with specified Shore hardness ranges (EN ISO 868).
• Fasteners and hardware: normative references to ISO/EN fastener standards (EN ISO 4032, EN ISO 8673, EN ISO 7089, EN 27434) and guidance on clamping options (clamping pieces, rings, pawls).
• Interchangeability focus: supplements withdrawn national standards (DIN 4253x series) to aid utilities and manufacturers in part replacement and cross‑compatibility.

Practical applications and users

Who uses EN 50180-2:

• Transformer manufacturers and bushing suppliers for component design and production.
• Utilities, asset managers and procurement teams for specifying interchangeable parts and spares.
• Test laboratories and quality engineers verifying dimensional conformity and materials.
• Maintenance and retrofit engineers selecting compatible seals, studs and fixation hardware.

How it’s used:

• Prepare component drawings and procurement specifications aligned to the EN 50180 series.
• Verify replacement parts for field service and refurbishment to ensure fit and sealing performance.
• Ensure consistent material choices and fastener standards across transformer fleets for simpler maintenance.

Related standards

• EN 50180-1:2015 - Part 1: General requirements for bushings (primary reference)
• EN 50180-3 - Part 3: Requirements for bushing fixations
• Normative references cited in EN 50180-2: EN 12164, EN 13601, EN 22768, EN ISO 868, EN ISO 4032, EN ISO 7089, EN ISO 8673, EN 27434

EN 50180-2:2015 is essential when specifying or replacing bushing components for liquid‑filled transformers to ensure safety, interchangeability and compliance with European electrotechnical practice.

SLOVENSKI STANDARD
01-januar-2016
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SIST EN 50180:2010
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Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers
- Part 2: Requirement for bushing components
Durchführungen über 1 kV bis 52 kV und von 250 A bis 3,15 kA für flüssigkeitsgefüllte
Transformatoren - Teil 2: Anforderungen an Einzelteile der Durchführungen
Traversées de tensions supérieures à 1 kV jusqu'à 52 kV et de 250 A à 3,15 kA pour
transformateurs immergés dans un liquide - Partie 2: Exigences relatives aux
composants de traversée
Ta slovenski standard je istoveten z: EN 50180-2:2015
ICS:
29.080.20 Skoznjiki Bushings
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50180-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2015
ICS 29.080.20
English Version
Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for
liquid filled transformers - Part 2: Requirement for bushing
components
Traversées de tensions supérieures à 1 kV jusqu'à 52 kV et Durchführungen über 1 kV bis 52 kV und von 250 A bis
de 250 A à 3,15 kA pour transformateurs immergés dans un 3,15 kA für flüssigkeitsgefüllte Transformatoren - Teil 2:
liquide - Partie 2: Exigences relatives aux composants de Anforderungen an Einzelteile der Durchführungen
traversée
This European Standard was approved by CENELEC on 2015-08-10. 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50180-2:2015 E
Content
Page
European foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Dimensions and designations .6
4.1 General .6
4.2 Components for open-type bushings for 250 A, 12 kV to 36 kV .6
4.3 Components for open-type bushings for 630 A, 12 kV to 36 kV .9
4.4 Components for open-type bushings for 1 250 A – 3150 A, 12 kV to 36 kV . 12
4.5 Components for open-type bushings for 250 A and 630 A, 52 kV . 19
4.6 Components for open-type bushings for 1 250 A to 3 150 A, 52 kV . 21

Figure
Figure 1 – Terminal stud (Item 2) .7
Figure 2 – Cap (Item 3) .7
Figure 3 – Gasket (Item 4) .8
Figure 4 – Spacer (Item 5) .8
Figure 5 – Packing (Item 6) .8
Figure 6 – Terminal stud (Item 2) . 10
Figure 7 – Cap (Item 3) . 11
Figure 8 – Gasket (Item 4) . 11
Figure 9 – Packing (Item 6) . 11
Figure 10 – Spacer (Item 5) . 11
Figure 11 – Terminal stud (Item 2) . 15
Figure 12 – Upper cap (Item 4) . 15
Figure 13 – Sealing ring (Item 5) . 16
Material: CW614N or equivalent acc. to EN 12164 . 16
Figure 14 – Lower cap (Item 6) . 16
Figure 15 – Vent plug (Item 8) . 16
Figure 16 – Gasket (Item 7) . 16
Figure 17 – Gasket M (Item 9) und Gasket N (Item 18) . 17
Figure 18 – Compression ring (Item 11) . 17
Figure 19 – Ring (Item 13) . 17
Figure 20 – Spacer (Item 10) . 18
Figure 21 – Potential ring . 18
Figure 22 – Terminal stud (Item 2) . 24
Figure 23 – Upper cap (Item 4) . 25
Figure 24 – Compression ring (Item 11) . 25
Page
Figure 25 – Lower cap (Item 6) . 26
Figure 26 – Spacer (Item 10). 26

Table
Table 1 – List of components, 250 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 3) . 6
Table 2 – List of components, 630 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 5) . 9
Table 3 – List of components, 1 250 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 7) . 12
Table 4 – List of components, 2 000 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 9) . 13
Table 5 – List of components, 3 150 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 9) . 14
Table 6 – List of components, 250 A, 52 kV (see EN 50180-1:2015, Table 11) . 19
Table 7 – List of components, 630 A, 52 kV (see EN 50180-1:2015, Table 11) . 20
Table 8 – List of components, 1 250 A, 52 kV (see EN 50180-1:2015, Table 13) . 21
Table 9 – List of components, 2 000 A, 52 kV (see EN 50180-1:2015, Table 13) . 22
Table 10 – List of components, 3 150 A, 52 kV (see EN 50180-1:2015, Table 13) . 23

European foreword
This document (EN 50180-2:2015) has been prepared by CLC/TC 36A "Insulated Bushings".

The following dates are fixed:

(dop) 2016-08-10
• latest date by which this document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-08-10
standards conflicting with this
document have to be withdrawn
This document supplements EN 50180-1:2015 by design details for components, described in the withdrawn
standards DIN 42531, DIN 42532 and DIN 42533 and it is important for utilities to manage interchangeability.
This document should document major additional information of the withdrawn standards.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

EN 50180 "Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers" consists
of the following parts:
– Part 1: General requirements for bushings;

– Part 2: Requirement for bushing components;

– Part 3: Requirements for bushing fixations.

1 Scope
This European Standard should be considered in factual context with EN 50180-1 only. The dimensional
supplements are related to figures and tables of EN 50180-1. To enable a better understanding of additional
information some tables from EN 50180-1 are used and extended.
This European Standard may now be used also for bushings with a highest voltage of 52 kV. Figures for the
details of the components and the related tables are added according to the extended range of voltage.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1652, Copper and copper alloys — Plate, sheet, strip and circles for general purposes
EN 12164, Copper and copper alloys — Rod for free machining purposes
EN 13599, Copper and copper alloys — Copper plate, sheet and strip for electrical purposes
EN 13601, Copper and copper alloys — Copper rod, bar and wire for general electrical purposes
EN 22768 (all parts), General tolerances (ISO 2768-1, all parts)
EN 27434, Slotted set screws with cone point (ISO 7434)
EN 50180-1:2015, Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers
— Part 1: General requirements for bushings
EN 50180-3, Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers — Part
3: Requirements for bushing fixations
EN ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (shore
hardness (ISO 868)
EN ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product
documentation (ISO 1302)
EN ISO 4032, Hexagon regular nuts (style 1) — Product grades A and B (ISO 4032)
EN ISO 4753, Fasteners – Ends of parts with external ISO metric thread (ISO 4753)
EN ISO 7089, Plain washers — Normal series — Product grade A (ISO 7089)
EN ISO 8673, Hexagon regular nuts (style 1) with metric fine pitch thread — Product grades A and B (ISO
8673)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 50180-1:2015 apply.
4 Dimensions and designations
4.1 General
Permissible deviations for tolerances without specified limits: EN 22768 (series).
The following tables refer to the respective tables in EN 50180-1:2015, additional data are added.
4.2 Components for open-type bushings for 250 A, 12 kV to 36 kV
Table 1 – List of components, 250 A, 12 kV to 36 kV (see EN 50180-1:2015, Table 3)
Item Quantity Designation Brief description Remark
2 1 Terminal stud D 250 Brass
3 1 Cap E 250 Brass
4 1 Gasket J 250 Insulating liquid resistant
material
5 1 Spacer O 250
Insulating liquid resistant
a
6 1 N 250
Packing
material
7 3 Nut EN ISO 4032 – M12 Brass
8 2 Washer EN ISO 7089 – 12 Brass
9 4 Nut EN ISO 4032 – M10 Corrosion-resistant steel
10 4 Washer EN ISO 7089 – 12 Corrosion-resistant steel
b
11 1 Spring washer  Corrosion-resistant steel
Version A: By means of a Clamping piece
12 4 Clamping piece Corrosion-resistant
Version B: By means of a Clamping ring
13 1 Clamping ring EN 50180-3 Corrosion-resistant
14 4 Clamping paw EN 50180-3 Corrosion-resistant
a
O-Ring according to individual agreement alternatively.
b
Conical spring washer according to individual agreement alternatively.

Dimensions in mm
Designation: Terminal stud D 250 Designation: Cap E 250
Material: CW617N or equivalent acc. to EN 12164 Material: CW614N or equivalent acc. to EN 12164
The external shape of the cap is not compulsory.
a
Thread M12 or drilling according to the applied
lead or bolt.
Figure 1 – Terminal stud (Item 2) Figure 2 – Cap (Item 3)
Dimensions in mm
Designation: Gasket J 250 Designation: Spacer O 250
Material: Insulating liquid resistant material, Material: Gasket material for high pressure,
Shore hardness A/65 to A/70         based on synthetic fibers
EN ISO 868
Figure 3 – Gasket (Item 4) Figure 4 – Spacer (Item 5)

Designation: Packing N 250
Material: Insulating liquid resistant material
Shore hardness A
...