UNE-EN 50121-3-2-2017 A1-2019 PDF

Full title and description

STB UNE-EN 50121-3-2:2017 A1:2019 — Railway applications — Electromagnetic compatibility (EMC) — Part 3-2: Rolling stock — Apparatus (amendment A1, 2019). This designation combines the national adoption label (UNE / STB as shown in the title) with the EN standard and its 2019 amendment. The document is an amendment to the EN 50121‑3‑2 series and updates specific emission and immunity requirements and test clarifications for electrical and electronic apparatus intended for use on railway rolling stock.

Abstract

This amendment (A1:2019) modifies EN 50121‑3‑2 (the rolling‑stock apparatus part of the EN 50121 EMC family) by clarifying test applicability, adding or adjusting a limited number of test limits/conditions and references, and aligning the document with related EMC basic standards. The scope covers conducted and radiated emission and immunity for apparatus and ports on rolling stock across the DC to 400 GHz range where applicable, and it is intended to be used together with EN 50121‑1 and other parts of the EN 50121 series.

General information

• Status: Amendment (A1:2019) to EN 50121‑3‑2 — published and nationally adopted by multiple member bodies.
• Publication date: Amendment A1:2019 — published in 2019 (national adoptions and listings show publication/adoption dates in spring–summer 2019; the amendment text is a short published change document dated 2019).
• Publisher: CENELEC (European Committee for Electrotechnical Standardization); nationally adopted by bodies such as AENOR (UNE), BSI, NSAI and others.
• ICS / categories: 33.100.01 (Electromagnetic compatibility in general); 45.060.01 (Railway rolling stock in general); 29.280 (Electric traction equipment) where applicable.
• Edition / version: EN 50121‑3‑2:2016 (sometimes adopted as 2017 in national catalogues) amended by A1:2019 — commonly cited as EN 50121‑3‑2:2016/A1:2019 or EN 50121‑3‑2:2017/A1:2019 depending on national adoption.
• Number of pages: Amendment A1 is a short document (typically 6 pages for the amendment text; national PDF packaging or national adoption documents may show different page counts).

Scope

Applies to emission and immunity aspects of electromagnetic compatibility for electrical and electronic apparatus intended for installation on railway rolling stock. The amendment refines and clarifies requirements for type testing and port‑by‑port emission/immunity limits, measurement distances and conditions, and references to basic EMC standards. Frequency coverage for the standard family is from 0 Hz (DC) to 400 GHz where relevant; AC and DC traction power ports are treated specially and, for large traction converters, vehicle‑level testing may be required.

Key topics and requirements

• EMC requirements for apparatus installed on rolling stock: emission and immunity objectives to avoid interference with other on‑board equipment and the wider railway environment.
• Port‑by‑port test approach: specific emission and immunity tests are assigned per port type (enclosure ports, signal/data ports, power ports, etc.).
• Frequency range covered: from DC to 400 GHz, with requirements specified where relevant and no measurement where no requirement exists.
• Measurement conditions and distances: guidance on measurement distances (e.g., 10 m reference, with 3 m permitted with adjusted limits) and reproducible test setups linked to referenced basic EMC standards.
• Exclusions and interactions with radio equipment standards: intentional radiators and radio equipment exclusion bands are addressed so that radiated emission/immunity limits do not conflict with radio‑equipment EMC standards.
• Integration and system considerations: where an apparatus is covered by a different EMC standard or cannot be fully tested individually (e.g., >50 kVA converters), system/vehicle integration measures and vehicle‑level tests (EN 50121‑3‑1) are required.
• References to basic EMC test standards (IEC/EN 61000 series, EN 550xx family) and to other EN 50121 parts (EN 50121‑1, EN 50121‑3‑1, EN 50121‑4, EN 50121‑5).

Typical use and users

Used by railway equipment manufacturers, rolling‑stock integrators, EMC test laboratories, certification bodies, system engineers, and procurement/specification authors. Typical use cases include type testing of on‑board apparatus (inverters, auxiliary converters, communication units, signaling interfaces, passenger information systems), EMC compliance assessment during vehicle integration, and drafting of EMC plans for vehicle projects.

Related standards

EN 50121‑1 (general EMC requirements for railway applications), EN 50121‑3‑1 (rolling stock — train and complete vehicle testing), EN 50121‑4 (signalling and telecommunications apparatus), EN 50121‑5 (fixed power supply installations), the IEC/EN 61000 series (basic EMC test and measurement methods such as IEC/EN 61000‑4‑2, ‑4‑3, ‑4‑5, ‑4‑6, ‑4‑30), and relevant EN/IEC radio‑equipment EMC standards (as exclusions for intentional radiators).

Keywords

EN 50121‑3‑2; A1:2019; railway EMC; rolling stock; apparatus; emissions; immunity; EMC testing; port‑by‑port; CENELEC; UNE (AENOR) adoption; IEC 61000; EN 50121 family.

FAQ

Q: What is this standard?

A: It is the amendment A1:2019 to EN 50121‑3‑2 (the part of the EN 50121 railway EMC family that deals with apparatus installed on rolling stock). The document provides clarifications, adjustments and additional editorial/technical notes to the main EN 50121‑3‑2 text.

Q: What does it cover?

A: It covers emission and immunity requirements and related test conditions for electrical and electronic apparatus intended to be installed on railway vehicles. The amendment refines which tests apply, measurement conditions, and references to basic EMC standards; it does not replace the main standard but modifies it where indicated.

Q: Who typically uses it?

A: Manufacturers of on‑board railway equipment, vehicle integrators, EMC test laboratories, certification and conformity assessment bodies, railway systems engineers, and procurement/specification writers who need to ensure EMC compliance of apparatus installed on rolling stock.

Q: Is it current or superseded?

A: The A1:2019 amendment is the official amendment to EN 50121‑3‑2 published in 2019 and has been nationally adopted by many member bodies. Standards evolve; a draft/revision (prEN 50121‑3‑2 with later revision activity) has been in development after 2019, so users should verify the current national status with their national standards body before citing the standard for regulatory or procurement purposes. (Check the national adoption record for the absolute current status in your country.)

Q: Is it part of a series?

A: Yes — it is part of the EN 50121 series (railway EMC). Key companion parts include EN 50121‑1 (general), EN 50121‑3‑1 (complete vehicle tests), EN 50121‑4 (signalling & telecoms), and EN 50121‑5 (fixed installations).

Q: What are the key keywords?

A: Railway EMC, rolling stock, apparatus, emissions, immunity, EN 50121‑3‑2, A1:2019, CENELEC, IEC 61000, port testing, vehicle integration.