SIST EN 50065-4-2:2003/A2:2005

• Status: Published
• Publication Date: 31-Aug-2005
• ICS: 31.160 - Electric filters
• ICS: 33.040.30 - Switching and signalling systems
• Technical Committee: KIN - Mains communicating systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2005
• Due Date: 01-Sep-2005
• Completion Date: 01-Sep-2005
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
  OJ Ref: C 348/03 OJ Date: 28-Nov-2013 Conflicting Date: 01-Mar-2008
• Directive:

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  2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
  OJ Ref: C 249/03 OJ Date: 08-Jul-2016
• Directive:

  ---

  73/23/EEC - Electrical equipment designed for use within certain voltage limits
• Ref Project: EN 50065-4-2:2001/A2:2005 - Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz and 1,6 MHz to 30 MHz - Part 4-2: Low voltage decoupling filters - Safety requirements

• Referred By: SIST EN 50065-4-1:2023 - Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz Part 4-1: Low voltage decoupling filters - Generic specification
• Effective Date: 03-Feb-2026
• Amends: SIST EN 50065-4-2:2003 - Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz and 1,6 MHz to 30 MHz -- Part 4-2: Low voltage decoupling filters - Safety requirements
• Effective Date: 21-Sep-2010
• Revised: oSIST prEN 50065-4-2:2021 - Signalling on low voltage electrical installations in the frequency range 3 kHz to 148,5 kHz Part 4-2: Low voltage decoupling filters - Safety requirements
• Effective Date: 14-May-2019

SIST EN 50065-4-2:2003/A2:2005 is the SIST edition of the CENELEC amendment to EN 50065-4-2:2001. It sets safety requirements for low voltage decoupling filters used in signalling on low-voltage electrical installations in the frequency ranges 3 kHz to 148,5 kHz and 1,6 MHz to 30 MHz. In practice, it helps manufacturers and test labs check discharge behaviour, insulation testing, component choice and short-circuit safety for these filters.

What does SIST EN 50065-4-2:2003/A2:2005 specify?

SIST EN 50065-4-2:2003/A2:2005 specifies amendments to the safety standard for low voltage decoupling filters. The amendment extends the title and coverage to include 1,6 MHz to 30 MHz, while keeping the document focused on safety rather than frequency-dependent performance.

The document is organized as an amendment to the existing EN 50065-4-2:2001 text. Its changes are grouped in the title, the foreword, and Clauses 10, 15, 23 and 25.

The foreword states that the safety standard has no frequency dependent content and that extending the scope to 30 MHz required no technical changes to the body of the document. That matters in practice because users should apply the same safety requirements across the extended frequency ranges.

What are the key requirements of SIST EN 50065-4-2:2005/A2:2005?

The most important changes are in the safety tests and in the treatment of higher-current filters. They mainly affect discharge safety, dielectric testing, and short-circuit design.

Discharge of capacitors and static charges

Clause 10.2.3 adds a discharge requirement for filters that contain capacitors above 0,1 µF connected between line conductors. After disconnection from the power supply, the voltage from static charges must fall below DC 120 V in less than 5 s. For users, this means the filter must not stay dangerously charged after unplugging or isolation.

Insulation resistance and dielectric strength testing

Clause 15.1 changes the test setup for insulation resistance and dielectric strength by disconnecting electronic components connected between live parts of different polarity. In practice, test laboratories need to isolate those components before applying the test conditions so that the test reflects the insulation of the filter structure, not the behaviour of sensitive electronics.

Clause 15.2.2 deletes Note 1. That means the clause text itself becomes the basis for interpreting the test, so test instructions should follow the main requirement rather than the removed note.

Fault current and short-circuit considerations

Clauses 23.1 and 25 add the same proposal for filters with rated currents equal to or higher than 40 A: consider a minimum prospective fault current of 6 000 A. For designers and buyers, this is a sign to check component ratings and short-circuit withstand capability for higher-current products.

Scope extension without body changes

The foreword explains that the amendment extends the title and scope to cover the wider frequency range, but does not change the technical body for frequency-dependent reasons. That matters because compliance work should focus on the amended safety points, not on any new signalling-performance rules.

What terms does SIST EN 50065-4-2:2005/A2:2005 define?

• Low voltage decoupling filters - Filters used to decouple signalling on low-voltage electrical installations from the mains network while maintaining safety.
• Line conductors - The conductors between which the capacitor discharge requirement in Clause 10.2.3 applies.
• Live parts of different polarity - Energized parts at different potential that are disconnected during the insulation and dielectric test preparation.
• Static charges - Residual electrical charge that must decay to a safe voltage after the filter is disconnected.
• Rated current - The current value used to classify filters, including the 40 A threshold in Clauses 23.1 and 25.
• Prospective fault current - The fault current level to be considered when checking component selection and short-circuit behaviour.
• Insulation resistance - The resistance that is checked to confirm separation between parts of the filter under test.
• Dielectric strength - The ability of the filter insulation to withstand the applied test voltage without breakdown.

Who uses SIST EN 50065-4-2:2005/A2:2005?

Manufacturers of low voltage decoupling filters use this amendment when designing products and preparing safety test evidence. Electrical safety laboratories use it to set up discharge, insulation and short-circuit checks.

It is also relevant to compliance engineers, quality managers and buyers working with signalling equipment for low-voltage electrical installations. In practice, they use it to confirm that a filter is suitable for the intended current rating, discharge behaviour and fault-current environment.

The foreword places the work in the context of SC 205A, Mains communicating systems, and CENELEC TC 205, Home and Building Electronic Systems (HBES). That points to use in mains communication and building systems work.

What changed in SIST EN 50065-4-2:2005/A2:2005 from the previous edition?

SIST EN 50065-4-2:2003/A2:2005 amends EN 50065-4-2:2001. The stated changes are:

• the title is replaced to include the extended frequency range;
• the foreword is expanded to explain the broader scope;
• Clause 10 adds the capacitor discharge requirement;
• Clause 15 adjusts the insulation and dielectric test wording and deletes Note 1 in 15.2.2;
• Clauses 23 and 25 add the 6 000 A prospective fault current proposal for filters at or above 40 A.

Which standards are used with SIST EN 50065-4-2:2005/A2:2005?

• EN 50065-4-2:2001 - This is the base European Standard that this amendment modifies.
• Part 4-7, Portable low voltage decoupling filters - Safety requirements - The foreword says this companion part should also cover both frequency ranges.
• The EN 50065 set of standards - The amendment belongs to this family of standards for signalling on low-voltage electrical installations.

What does the SIST EN 50065-4-2:2005/A2:2005 document contain?

The document contains a title revision, a foreword update and targeted changes to Clauses 10, 15, 23 and 25. The technical content focuses on safe discharge after disconnection, how to prepare filters for insulation resistance and dielectric strength testing, and what fault current to consider for higher-current filters.

It gives a practical discharge condition for capacitors between line conductors. It also gives test-lab instructions for disconnecting certain electronic components during dielectric testing.

For design and verification work, the document points to fault-current and short-circuit considerations for filters rated at 40 A or more.

SLOVENSKI SIST EN 50065-4-
2:2003/A2:2005
STANDARD
september 2005
Signalizacija po nizkonapetostnih električnih napeljavah v frekvenčnem
območju od 3 kHz do 148,5 kHz – 4-2. del: Nizkonapetostni ločilni filtri –
Varnostne zahteve
Signalling on low-voltage electrical installations in the frequency range 3 kHz to
148,5 kHz - Part 4-2: Low voltage decoupling filters - Safety requirements
ICS 31.160; 33.040.30 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 50065-4-2/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2005
ICS 31.160; 33.040.30
English version
Signalling on low-voltage electrical installations
in the frequency range 3 kHz to 148,5 kHz and 1,6 MHz to 30 MHz
Part 4-2: Low voltage decoupling filters –
Safety requirements
Transmission de signaux sur les réseaux Signalübertragung auf elektrischen
électriques basse tension dans la bande Niederspannungsnetzen im
de fréquences de 3 kHz à 148,5 kHz Frequenzbereich 3 kHz bis 148,5 kHz
et de 1,6 MHz à 30 MHz und 1,6 MHz zu 30 MHz
Partie 4-2: Filtres basse tension de Teil 4-2: Niederspannungs-
découplage - Exigences de sécurité Entkopplungsfilter -
Sicherheitsanforderungen
This amendment A2 modifies the European Standard EN 50065-4-2:2001; it was approved by CENELEC
on 2005-03-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this amendment 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 Central Secretariat or to any CENELEC member.

This amendment 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
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50065-4-2:2001/A2:2005 E

EN 50065-4-2:200
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