IEC 60332-1-2:2025

Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame

IEC 60332‑1‑2:2025 specifies the procedure for testing the resistance to vertical flame propagation for a single vertical electrical insulated conductor or cable, or optical fibre cable, under fire conditions using a 1 kW pre-mixed flame. The apparatus is described in IEC 60332‑1‑1.
NOTE 1 Testing to IEC 60332‑1‑2 can be performed simultaneously with that to IEC 60332‑1‑3, if required.
This group safety publication focusing on test method(s) is primarily intended to be used as a product safety standard for the products mentioned in the scope, but is also intended to be used by technical committees in the preparation of standards for products similar to those mentioned in the scope of this group safety publication, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
NOTE 2 The performing of this test method on a single insulated conductor or cable or optical fibre cable does not provide compliance with fire propagation requirements in relevant standards in the case that the single insulated conductor or cable or optical fibre cable is installed with or amongst other cables as a group. (See the IEC 60332‑3 series).
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications and/or group safety publications in the preparation of its publications.

Essais des câbles électriques et à fibres optiques soumis au feu - Partie 1-2: Essai de propagation verticale de la flamme sur conducteur ou câble isolé - Procédure pour flamme à prémélange de 1 kW

La CEI 60332-1-2:2025 spécifie la procédure d'essai de la résistance à la propagation verticale de la flamme pour un conducteur ou câble isolé électrique vertical unique, ou un câble à fibres optiques, dans des conditions d'incendie en utilisant une flamme prémélangée de 1 kW. L'appareillage est décrit dans la CEI 60332-1-1.
NOTE 1 Les essais selon la CEI 60332-1-2 peuvent être effectués simultanément avec ceux selon la CEI 60332-1-3, si nécessaire.
La présente publication de sécurité de groupe axée sur la (les) méthode(s) d'essai est principalement destinée à être utilisée comme norme de sécurité pour les produits mentionnés dans le domaine d'application, mais elle est également destinée à être utilisée par les comités d'études dans la préparation de normes pour des produits similaires à ceux mentionnés dans le domaine d'application de la présente publication de sécurité de groupe, conformément aux principes énoncés dans le Guide 104 de la CEI et le Guide 51 de l'ISO/CEI.
NOTE 2 L'application de cette méthode d'essai à un conducteur ou câble isolé ou à un câble à fibres optiques n'assure pas la conformité aux exigences de propagation du feu des normes pertinentes dans le cas où le conducteur ou câble isolé ou le câble à fibres optiques est installé avec ou parmi d'autres câbles en tant que groupe. (Voir la série IEC 60332-3).
L'une des responsabilités d'un comité d'études est, le cas échéant, d'utiliser les publications sur la sécurité de base et/ou les publications sur la sécurité de groupe dans la préparation de ses publications.

General Information

• Status: Published
• Publication Date: 09-Jun-2025
• ICS: 13.220.40 - Ignitability and burning behaviour of materials and products
• ICS: 29.020 - Electrical engineering in general
• ICS: 29.060.20 - Cables
• Technical Committee: TC 20 - Electric cables
• Drafting Committee: WG 18 - TC 20/WG 18
• Current Stage: PPUB - Publication issued
• Start Date: 10-Jun-2025
• Completion Date: 13-Jun-2025

Relations

• Revises: IEC 60332-1-2:2004/AMD1:2015 - Amendment 1 - Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame
• Effective Date: 05-Sep-2023
• Revises: IEC 60332-1-2:2004 - Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame
• Effective Date: 05-Sep-2023

Overview

IEC 60332-1-2:2025 specifies a standardized laboratory procedure to assess vertical flame propagation for a single insulated electrical conductor, cable or optical fibre cable using a 1 kW pre‑mixed flame. The series apparatus is defined in IEC 60332-1-1. This Edition 2.0 (2025) updates positioning requirements and adds performance criteria (Annex A). The test is a product‑safety test method used by manufacturers, test laboratories and technical committees to evaluate single‑cable flame behaviour under fire conditions.

Key topics and technical requirements

• Scope: Single vertical insulated conductor, cable or optical fibre cable tested for vertical flame propagation using a 1 kW pre‑mixed flame.
• Apparatus: Use the test enclosure and burner arrangement detailed in IEC 60332-1-1.
• Sample size: Test piece length 600 ± 25 mm. Overall diameter measured per IEC 60811‑203 (three measurements averaged).
• Conditioning: (23 ± 5) °C, (50 ± 20) % RH, for at least 16 h. Painted/lacquered samples require a prior 60 °C for 4 h treatment.
• Mounting & positioning:
  • Distance between supports: 550 ± 5 mm.
  • Bottom of specimen ~50 mm from base of enclosure; centered laterally.
  • Recommended retaining wire diameters: 1.0 ± 0.3 mm for cables ≤50 mm, 1.5 ± 0.3 mm for >50 mm.
  • If sample moves, use 1 mm wire loops positioned ~50 ± 5 mm below and 50 ± 5 mm and 150 ± 5 mm above the blue cone impingement point.
• Flame application:
  • Burner tip (blue cone) impinges 475 ± 5 mm from upper support; burner angled 45 ± 2° to vertical.
  • Flame exposure times depend on overall diameter:
    • D ≤ 25 mm: 60 ± 2 s
    • 25 < D ≤ 50 mm: 120 ± 2 s
    • 50 < D ≤ 75 mm: 240 ± 2 s
    • D > 75 mm: 480 ± 2 s
• Safety: Explicit warnings on fire/explosion risk, inhalation of smoke or noxious products (notably halogenated materials), and harmful residues.
• Evaluation: After burning ceases, residues are examined and results evaluated against the performance requirements (Annex A).

Applications and users

IEC 60332-1-2 is used by:

• Cable and optical fibre manufacturers for product development and internal QA.
• Accredited fire‑test laboratories performing routine type testing and compliance checks.
• Certification bodies and safety assessors verifying product flame behaviour as a product‑safety test method.
• Standards committees preparing product standards that reference single‑cable flame performance.

Note: This single‑cable test does not substitute for group‑cable propagation tests (see the IEC 60332‑3 series) when cables are installed in bundles or trays.

Related standards

• IEC 60332-1-1 (apparatus)
• IEC 60332-1-3 (vertical flame test variants)
• IEC 60332-3 series (group cable tests)
• IEC 60811-203 (diameter measurement)
• IEC Guide 104 / ISO/IEC Guide 51 (safety and standardization principles)

Keywords: IEC 60332-1-2, vertical flame propagation, 1 kW pre‑mixed flame, cable fire testing, single insulated conductor, optical fibre cable, IEC 60332 series.

Standards Content (Sample)

IEC 60332-1-2 ®
Edition 2.0 2025-06
INTERNATIONAL
STANDARD
Tests on electric and optical fibre cables under fire conditions –
Part 1-2: Test for vertical flame propagation for a single insulated wire or cable –
Procedure for 1 kW pre-mixed flame
ICS 13.220.40; 29.020; 29.060.20 ISBN 978-2-8327-0430-1
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– 2 – IEC 60332-1-2:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test apparatus . 6
5 Procedure . 6
5.1 Sample . 6
5.2 Conditioning . 6
5.3 Positioning of test piece . 6
5.4 Flame application . 7
5.4.1 Safety warning . 7
5.4.2 Positioning of flame . 7
5.4.3 Test duration . 7
6 Evaluation of test results . 8
7 Performance requirements. 8
Annex A (normative) Performance requirements . 11
Bibliography . 12

Figure 1 – Arrangement of test piece in test apparatus . 9
Figure 2 – Application of flame to test piece . 10

Table 1 – Time for flame application . 8
Table A.1 – Performance requirements . 11

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 1-2: Test for vertical flame propagation for a single insulated wire
or cable – Procedure for 1 kW pre-mixed flame

FOREWORD
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IEC 60332-1-2 has been prepared by IEC technical committee 20: Electric cables. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2004 and
Amendment 1:2015. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) modification in positioning of test pieces, which move out of the flame (5.3);
b) addition of performance requirements (Annex A).

– 4 – IEC 60332-1-2:2025 © IEC 2025
The text of this International Standard is based on the following documents:
Draft Report on voting
20/2232/FDIS 20/2244/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This document has the status of a group safety publication in accordance with IEC Guide 104.
A list of all parts in the IEC 60332 series, published under the general title Tests on electric and
optical fibre cables under fire conditions, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
TESTS ON ELECTRIC AND OPTICAL FIBRE CABLES
UNDER FIRE CONDITIONS –
Part 1-2: Test for vertical flame propagation for a single insulated wire
or cable – Procedure for 1 kW pre-mixed flame

1 Scope
This part of IEC 60332 specifies the procedure for testing the resistance to vertical flame
propagation for a single vertical electric insulated conductor or cable, or optical fibre cable,
under fire conditions using a 1 kW pre-mixed flame. The apparatus is described in
IEC 60332-1-1.
NOTE 1 Testing to IEC 60332-1-2 can be performed simultaneously with that to IEC 60332-1-3, if required.
This group safety publ
...