IEC 63494-2-1:2026
(Main)Lighting systems - Electro-mechanical interfaces - Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
Lighting systems - Electro-mechanical interfaces - Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
IEC 63494‑2-1:2026 specifies the interchangeability requirements of an electro-mechanical interface with four-pin extra-low-voltage (ELV) twist-lock interface – type ZB18 for use in lighting systems. This twist-lock interface has four electrical contacts that are suitable for ELV voltages. Two connections are intended for supply power and two are intended for digital communication. This document specifies interchangeability related requirements for mechanical, electrical, ambient conditions, positional orientation, communication protocol and pin assignments for the interface. Specific requirements for the devices that can utilize the interface such as sensors, communication modules, cameras, etc., are not within the scope of this document. This document does not specify the following aspects:
- the lighting technology,
- the illumination performance,
- electromagnetic compatibility (EMC).
Systèmes d'éclairage - Interfaces électromécaniques - Partie 2-1: Interface très basse tension à verrouillage rotatif (twist-lock) à quatre broches de type ZB18
L'IEC 63494‑2-1:2026 spécifie les exigences d'interchangeabilité d'une interface électromécanique avec une interface très basse tension (TBT) à verrouillage rotatif (twist-lock) à quatre broches de type ZB18 destinée à être utilisée dans les systèmes d'éclairage. Cette interface à verrouillage rotatif comporte quatre contacts électriques adaptés aux tensions TBT. Deux connexions sont destinées à l'alimentation et deux sont destinées à la communication numérique. Le présent document spécifie les exigences d'interchangeabilité relatives aux conditions mécaniques, électriques et ambiantes, à l'orientation de position, au protocole de communication et à l'affectation des broches pour l'interface. Les exigences spécifiques aux dispositifs qui peuvent utiliser l'interface, tels que les capteurs, les modules de communication, les caméras, etc., ne relèvent pas du domaine d'application du présent document. Le présent document ne spécifie pas les aspects suivants:
- la technologie d'éclairage;
- les performances d'éclairement;
- la compatibilité électromagnétique (CEM).
General Information
- Status
- Published
- Publication Date
- 17-Feb-2026
- Technical Committee
- TC 34 - Lighting
- Drafting Committee
- WG 14 - TC 34/WG 14
- Current Stage
- PPUB - Publication issued
- Start Date
- 18-Feb-2026
- Completion Date
- 06-Mar-2026
Buy Documents
IEC 63494-2-1:2026 - Lighting systems - Electro-mechanical interfaces - Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
IEC 63494-2-1:2026 - Systèmes d'éclairage - Interfaces électromécaniques - Partie 2-1: Interface très basse tension à verrouillage rotatif (twist-lock) à quatre broches de type ZB18
IEC 63494-2-1:2026 - Lighting systems - Electro-mechanical interfaces - Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
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Frequently Asked Questions
IEC 63494-2-1:2026 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Lighting systems - Electro-mechanical interfaces - Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18". This standard covers: IEC 63494‑2-1:2026 specifies the interchangeability requirements of an electro-mechanical interface with four-pin extra-low-voltage (ELV) twist-lock interface – type ZB18 for use in lighting systems. This twist-lock interface has four electrical contacts that are suitable for ELV voltages. Two connections are intended for supply power and two are intended for digital communication. This document specifies interchangeability related requirements for mechanical, electrical, ambient conditions, positional orientation, communication protocol and pin assignments for the interface. Specific requirements for the devices that can utilize the interface such as sensors, communication modules, cameras, etc., are not within the scope of this document. This document does not specify the following aspects: - the lighting technology, - the illumination performance, - electromagnetic compatibility (EMC).
IEC 63494‑2-1:2026 specifies the interchangeability requirements of an electro-mechanical interface with four-pin extra-low-voltage (ELV) twist-lock interface – type ZB18 for use in lighting systems. This twist-lock interface has four electrical contacts that are suitable for ELV voltages. Two connections are intended for supply power and two are intended for digital communication. This document specifies interchangeability related requirements for mechanical, electrical, ambient conditions, positional orientation, communication protocol and pin assignments for the interface. Specific requirements for the devices that can utilize the interface such as sensors, communication modules, cameras, etc., are not within the scope of this document. This document does not specify the following aspects: - the lighting technology, - the illumination performance, - electromagnetic compatibility (EMC).
IEC 63494-2-1:2026 is classified under the following ICS (International Classification for Standards) categories: 29.140.50 - Lighting installation systems. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 63494-2-1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
IEC 63494-2-1 ®
Edition 1.0 2026-02
INTERNATIONAL
STANDARD
Lighting systems - Electro-mechanical interfaces -
Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
ICS 29.140.50 ISBN 978-2-8327-1059-3
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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
5 Marking . 8
5.1 Product identification . 8
5.2 Product characteristics . 8
5.3 Durability and legibility . 8
6 Electro-mechanical interface overview and dimensions . 9
6.1 Overview . 9
6.2 Mechanical interface dimensions . 9
6.2.1 Luminaire extension base plate . 9
6.2.2 Luminaire extension cap . 12
6.2.3 Luminaire extension module . 12
6.2.4 Luminaire extension receptacle . 12
7 Mechanical safety . 13
7.1 Physical protection during insertion and removal of lighting system devices . 13
7.1.1 General. 13
7.1.2 Withstand torque test . 14
7.2 Physical safety in latching release mechanisms . 14
7.3 Protection against damaging pins during insertion . 14
7.4 Mechanical strength . 14
7.4.1 General. 14
7.4.2 Base plate tests . 14
7.4.3 Receptacle tests . 14
7.5 Retention force and torque . 14
7.5.1 General requirements . 14
7.5.2 Receptacle tests . 14
7.5.3 Base plate tests . 15
7.6 Bending moment. 15
7.6.1 Base plate bending moment . 15
7.6.2 Receptacle bending moment . 15
7.6.3 Compliance . 15
8 Electrical safety . 15
8.1 Electric shock protection . 15
8.2 Electric insulation . 15
8.2.1 General. 15
8.2.2 Insulation classification. 15
8.2.3 Electric strength . 15
8.2.4 Creepage and clearance distances . 16
8.2.5 Live insertion and disconnection . 16
8.3 Electrical interchangeability . 16
8.4 Endurance tests . 16
8.4.1 Heat aging . 16
8.4.2 Contact resistance . 16
9 Ambient condition safety . 17
9.1 Ingress protection – IP rating . 17
9.1.1 General. 17
9.1.2 IP test – Receptacles . 17
9.1.3 IP test – Base plate or protective cover . 17
9.2 Rough service . 17
10 Construction. 17
10.1 Current carrying parts . 17
10.2 Resistance to heat, fire and tracking . 17
10.3 Polarisation . 17
10.4 Protection against corrosion . 17
Annex A (normative) Test sequence and gauges . 18
A.1 General . 18
A.2 Luminaire extension module base plate (LEX-BP) gauges . 19
A.2.1 Mechanical stop gauge . 19
A.2.2 Gauge receptacle. 20
A.3 Luminaire extension receptacle (LEX-R) gauges . 20
A.3.1 Retention gauge . 20
A.3.2 Reference luminaire extension module . 21
A.3.3 Contact making . 21
A.3.4 Aging module . 22
Annex B (informative) Information for luminaire and luminaire extension module
design . 23
B.1 General . 23
B.2 Luminaire extension receptacle exclusion limit zone . 23
B.3 Electrical and communication interface . 23
B.3.1 General. 23
B.3.2 General specifications . 24
B.3.3 Pin assignment . 24
B.3.4 Auxiliary power supply at the LEX-R . 25
B.3.5 Auxiliary power consumption for the LEX-M . 25
B.3.6 Communication . 25
Bibliography . 27
Figure 1 – Luminaire extension module, cap and receptacle in a system . 9
Figure 2 – Mechanical interface of the LEX-BP: View 1 . 10
Figure 3 – Mechanical interface of the LEX‐BP: View 2 . 10
Figure 4 – Details of the mechanical interface of the LEX‐BP: section B‐B. 11
Figure 5 – Details of the mechanical interface of LEX‐BP: sections C‐C and D‐D . 11
Figure 6 – Details of the mechanical interface of the LEX‐BP: section E‐E. 12
Figure 7 – Mechanical interface of the LEX-R . 13
Figure 8 – Detail of the mechanical interface of the LEX-R . 13
Figure A.1 – Dimensions of the mechanical stop gauge . 19
Figure A.2 – Mechanical drawing of the retention gauge . 20
Figure A.3 – Inclusion limit zone of the LEX-M . 21
Figure A.4 – Mechanical drawings of the contact making gauge minimum and
maximum . 22
Figure B.1 – Gasket area and luminaire exclusion limit zone . 23
Figure B.2 – Overview of the luminaire with LEX-Rs and LEX-Ms . 24
Table 1 – Elemental composition in plating of contacts for LEX-BP and LEX-R . 12
Table A.1 – Test groups and gauges . 18
Table B.1 – Characteristics of the type A LEX-M and the type B LEX-M . 24
Table B.2 – Assignments of contacts in the LEX-M and the LEX-R . 25
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Lighting systems - Electro-mechanical interfaces -
Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
FOREWORD
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IEC 63494-2-1 has been prepared by IEC technical committee 34: Lighting. It is an International
Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
34/1412/FDIS 34/1426/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.
A list of all parts in the IEC 63494 series, published under the general title Lighting systems -
Electro-mechanical interfaces, can be found on the IEC website.
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.
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.
INTRODUCTION
The IEC 63494-2 series of standards are intended to provide detailed specifications,
requirements, information and any useful gauges for particular electro-mechanical interfaces
used in lighting systems. The parts of the IEC 63494-2 series augment and refer to IEC 63494-1,
the safety standard for general electro-mechanical interfaces used in lighting systems. Detailed
specifications for both luminaire-side and device-side interfaces are included. The structure of
each document in the IEC 63494-2 series parallels that of IEC 63494-1 for ease of reference.
A testing sequence and useful gauges are provided in Annex A of each document. Information
useful for luminaire and device design can be found in subsequent annexes.
1 Scope
This part of IEC 63494-2 specifies the interchangeability requirements of an electro-mechanical
interface with four-pin extra-low-voltage (ELV) twist-lock interface – type ZB18 for use in lighting
systems. This twist-lock interface has four electrical contacts that are suitable for ELV voltages.
Two connections are intended for supply power and two are intended for digital communication.
This document specifies interchangeability related requirements for mechanical, electrical,
ambient conditions, positional orientation, communication protocol and pin assignments for the
interface. Specific requirements for the devices that can utilize the interface such as sensors,
communication modules, cameras, etc., are not within the scope of this document. This
document does not specify the following aspects:
– the lighting technology,
– the illumination performance,
– electromagnetic compatibility (EMC).
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.
IEC 60050-845, International Electrotechnical Vocabulary (IEV) - Part 845: Lighting, available
at https://www.electropedia.org
IEC 60598-1:2024, Luminaires - Part 1: General requirements and tests
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems -
Part 1: Principles, requirements and tests
IEC 60664-1:2020/AMD1:2025
IEC 62504, General lighting - Light emitting diode (LED) products and related equipment -
Terms and definitions
IEC TS 63105, Lighting systems and related equipment - Vocabulary
IEC 63494-1:2026, Lighting systems - Electro-mechanical interfaces - Part 1: Safety
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-845 (IEV),
IEC TS 63105, IEC 62504, IEC 63494-1, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
luminaire extension base plate
LEX-BP
device-side interface designed to mate with a LEX-R
Note 1 to entry: The base plate can be an integral or a separable part of the luminaire extension module.
3.2
luminaire extension receptacle
LEX-R
luminaire-side interface mounted on an exterior surface designed to mate with a LEX-BP or a
LEX-C
Note 1 to entry: The luminaire extension receptacle (LEX-R) can be a built-in part or an integral part of the luminaire
3.3
luminaire extension module
LEX-M
device having a LEX-BP, intended to be mounted on a luminaire having a LEX-R
3.4
luminaire extension cap
LEX-C
cap having no electrical contacts and designed to mate with a LEX-R
3.5
luminaire extension bus
LEX-B
electrical bus within a luminaire and its mounting pole
4 General
Electro-mechanical interface components specified in this document shall comply with
IEC 63494-1:2026. Marking requirements are specified in Clause 5 of this document. Clause 6
of this document specifies requirements for the luminaire electro-mechanical interface.
Clause 7 to Clause 10 of this document parallel the safety requirements in IEC 63494-1:2026.
Annex A provides requirements on test grouping and gauges. Annex B provides information
useful for luminaire and luminaire extension module design.
Mechanical dimensions refer to a temperature of (25 ± 5) °C.
All lengths that omit an explicit unit indication are in millimetres.
5 Marking
5.1 Product identification
IEC 63494-1:2026, 5.1 applies.
5.2 Product characteristics
IEC 63494-1:2026, 5.2 applies.
5.3 Durability and legibility
IEC 63494-1:2026, 5.3 applies.
6 Electro-mechanical interface overview and dimensions
6.1 Overview
Figure 1 gives an overview of a luminaire with luminaire extension receptacle, a luminaire
extension cap and a luminaire extension module with a luminaire extension base plate. The
luminaire extension receptacle is typically mounted on the exterior of the luminaire but can also
be mounted on the interior of the luminaire and the contacts of this receptacle are typically
connected to the luminaire internal electronics.
Figure 1 – Luminaire extension module, cap and receptacle in a system
The luminaire extension module is a separa
...
IEC 63494-2-1 ®
Edition 1.0 2026-02
NORME
INTERNATIONALE
Systèmes d'éclairage - Interfaces électromécaniques -
Partie 2-1: Interface très basse tension à verrouillage rotatif (twist-lock) à quatre
broches de type ZB18
ICS 29.140.50 ISBN 978-2-8327-1059-3
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SOMMAIRE
AVANT-PROPOS . 4
INTRODUCTION . 6
1 Domaine d'application . 7
2 Références normatives . 7
3 Termes et définitions. 7
4 Généralités . 8
5 Marquage . 8
5.1 Identification du produit . 8
5.2 Caractéristiques du produit . 8
5.3 Durabilité et lisibilité. 9
6 Vue d'ensemble et dimensions de l'interface électromécanique . 9
6.1 Vue d'ensemble . 9
6.2 Dimensions de l'interface mécanique . 9
6.2.1 Plaque de base d'extension de luminaire . 9
6.2.2 Culot d'extension de luminaire . 12
6.2.3 Module d'extension de luminaire . 12
6.2.4 Prise femelle d'extension de luminaire . 12
7 Sécurité mécanique . 14
7.1 Protection physique pendant l'insertion et le retrait des dispositifs du
système d'éclairage . 14
7.1.1 Généralités . 14
7.1.2 Essai de couple de tenue . 14
7.2 Sécurité physique des mécanismes de déverrouillage . 14
7.3 Protection contre l'endommagement des broches pendant l'insertion . 14
7.4 Résistance mécanique . 14
7.4.1 Généralités . 14
7.4.2 Essais des plaques de base . 14
7.4.3 Essais des prises femelles . 14
7.5 Force de traction et couple . 14
7.5.1 Exigences générales . 14
7.5.2 Essais des prises femelles . 15
7.5.3 Essais des plaques de base . 15
7.6 Moment de flexion . 15
7.6.1 Moment de flexion de la plaque de base . 15
7.6.2 Moment de flexion de la prise femelle . 15
7.6.3 Conformité . 15
8 Sécurité électrique . 15
8.1 Protection contre les chocs électriques . 15
8.2 Isolation électrique . 15
8.2.1 Généralités . 15
8.2.2 Classe d'isolation . 16
8.2.3 Rigidité diélectrique . 16
8.2.4 Lignes de fuite et distances d'isolement . 16
8.2.5 Insertion et déconnexion sous tension . 16
8.3 Interchangeabilité électrique . 16
8.4 Essais d'endurance . 17
8.4.1 Vieillissement thermique . 17
8.4.2 Résistance de contact . 17
9 Sécurité des conditions ambiantes . 17
9.1 Indice de protection – Caractéristique IP assignée . 17
9.1.1 Généralités . 17
9.1.2 Essai IP – Prises femelles . 17
9.1.3 Essai IP – Plaque de base ou vasque de protection . 17
9.2 Conditions sévères d'emploi . 17
10 Construction. 17
10.1 Parties transportant le courant . 17
10.2 Résistance à la chaleur, au feu et aux courants de cheminement . 17
10.3 Polarisation . 18
10.4 Protection contre la corrosion . 18
Annexe A (normative) Séquence d'essais et calibres . 19
A.1 Généralités . 19
A.2 Calibres des plaques de base du module d'extension du luminaire (LEX-BP) . 20
A.2.1 Calibre d'arrêt mécanique . 20
A.2.2 Prise femelle calibre . 21
A.3 Calibres de prise femelle d'extension de luminaire (LEX-R) . 21
A.3.1 Calibre de retenue . 21
A.3.2 Module d'extension de luminaire de référence . 22
A.3.3 Fermeture des contacts . 23
A.3.4 Module de vieillissement . 24
Annexe B (informative) Informations relatives à la conception des luminaires et des
modules d'extension de luminaire . 25
B.1 Généralités . 25
B.2 Zone limite d'exclusion de la prise femelle d'extension de luminaire . 25
B.3 Interface électrique et de communication . 25
B.3.1 Généralités . 25
B.3.2 Spécifications générales . 26
B.3.3 Affectation des broches . 27
B.3.4 Alimentation électrique auxiliaire au niveau du LEX-R. 27
B.3.5 Consommation d'énergie auxiliaire pour le LEX-M . 27
B.3.6 Communication . 28
Bibliographie . 29
Figure 1 – Module, culot et prise femelle d'extension de luminaire dans un système . 9
Figure 2 – Interface mécanique du LEX-BP: vue 1 . 10
Figure 3 – Interface mécanique du LEX-BP: vue 2 . 10
Figure 4 – Détails de l'interface mécanique du LEX-BP: section B-B . 11
Figure 5 – Détails de l'interface mécanique du LEX‐BP: sections C‐C et D‐D . 11
Figure 6 – Détails de l'interface mécanique du LEX‐BP: section E‐E . 12
Figure 7 – Interface mécanique du LEX-R . 13
Figure 8 – Détail de l'interface mécanique du LEX-R . 13
Figure A.1 – Dimensions du calibre d'arrêt mécanique . 21
Figure A.2 – Dessin mécanique du calibre de retenue . 22
Figure A.3 – Zone limite d'inclusion du LEX-M . 23
Figure A.4 – Dessins mécaniques du calibre de fermeture des contacts minimal et
maximal. 24
Figure B.1 – Zone de joint et zone d'exclusion du luminaire . 25
Figure B.2 – Vue d'ensemble du luminaire avec des LEX-R et des LEX-M . 26
Tableau 1 – Composition élémentaire du revêtement des contacts pour le LEX-BP et le
LEX-R . 12
Tableau A.1 – Groupes d'essais et calibres . 19
Tableau B.1 – Caractéristiques du LEX-M de type A et du LEX-M de type B . 26
Tableau B.2 – Affectation des contacts dans le LEX-M et le LEX-R. 27
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Systèmes d'éclairage - Interfaces électromécaniques -
Partie 2-1: Interface très basse tension à verrouillage rotatif (twist-lock)
à quatre broches de type ZB18
AVANT-PROPOS
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L'IEC 63494-2-1 a été établie par le comité d'études 34 de l'IEC: Éclairage. Il s'agit d'une Norme
internationale.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
34/1412/FDIS 34/1426/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Une liste de toutes les parties de la série IEC 63494, publiées sous le titre général Systèmes
d'éclairage – Interfaces électromécaniques, se trouve sur le site web de l'IEC.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
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www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications.
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives au document
recherché. À cette date, le document sera
– reconduit,
– supprimé, ou
– révisé.
INTRODUCTION
La série de normes IEC 63494-2 est destinée à fournir des spécifications particulières, des
exigences, des informations et tout calibre pertinent pour des interfaces électromécaniques
particulières utilisées dans les systèmes d'éclairage. Les parties de la série IEC 63494-2
complètent l'IEC 63494-1, qui constitue la norme de sécurité pour les interfaces
électromécaniques générales utilisées dans les systèmes d'éclairage. Des spécifications
particulières sont incluses pour les interfaces côté luminaire et côté dispositif. La structure de
chaque document de la série IEC 63494-2 est alignée sur celle de l'IEC 63494-1 par souci de
commodité. Une séquence d'essais et les calibres pertinents sont fournis à l'Annexe A de
chaque document. Des informations utiles pour la conception des luminaires et des dispositifs
peuvent figurer dans les annexes suivantes.
1 Domaine d'application
La présente partie de la série IEC 63494-2 spécifie les exigences d'interchangeabilité d'une
interface électromécanique avec une interface très basse tension (TBT) à verrouillage rotatif
(twist-lock) à quatre broches de type ZB18 destinée à être utilisée dans les systèmes
d'éclairage. Cette interface à verrouillage rotatif comporte quatre contacts électriques adaptés
aux tensions TBT. Deux connexions sont destinées à l'alimentation et deux sont destinées à la
communication numérique. Le présent document spécifie les exigences d'interchangeabilité
relatives aux conditions mécaniques, électriques et ambiantes, à l'orientation de position, au
protocole de communication et à l'affectation des broches pour l'interface. Les exigences
spécifiques aux dispositifs qui peuvent utiliser l'interface, tels que les capteurs, les modules de
communication, les caméras, etc., ne relèvent pas du domaine d'application du présent
document. Le présent document ne spécifie pas les aspects suivants:
– la technologie d'éclairage;
– les performances d'éclairement;
– la compatibilité électromagnétique (CEM).
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu'ils constituent, pour tout ou partie
de leur contenu, des exigences du présent document. Pour les références datées, seule
l'édition citée s'applique. Pour les références non datées, la dernière édition du document de
référence s'applique (y compris les éventuels amendements).
IEC 60050-845, Vocabulaire électrotechnique international (IEV) - Partie 845: Éclairage,
disponible à l'adresse https://www.electropedia.org
IEC 60598-1:2024, Luminaires - Partie 1: Exigences générales et essais
IEC 60664-1:2020, Coordination de l'isolement des matériels dans les réseaux d'énergie
électrique à basse tension - Partie 1: Principes, exigences et essais
IEC 60664-1:2020/AMD1:2025
IEC 62504, Éclairage général - Produits à diode électroluminescente (LED) et équipements
associés - Termes et définitions
IEC TS 63105, Lighting systems and related equipment - Vocabulary (disponible en anglais
seulement)
IEC 63494-1:2026, Systèmes d'éclairage - Interfaces électromécaniques - Partie 1: Sécurité
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions de l'IEC 60050-845 (IEV), de
l'IEC TS 63105, de l'IEC 62504, de l'IEC 63494-1 ainsi que les suivants s'appliquent.
L'ISO et l'IEC tiennent à jour des bases de données terminologiques destinées à être utilisées
en normalisation, consultables aux adresses suivantes:
– IEC Electropedia: disponible à l'adresse https://www.electropedia.org/
– ISO Online browsing platform: disponible à l'adresse https://www.iso.org/obp
3.1
plaque de base d'extension de luminaire
LEX-BP
interface côté dispositif conçue pour s'accoupler avec un LEX-R
Note 1 à l'article: La plaque de base peut faire partie intégrante du module d'extension du luminaire ou être
amovible.
3.2
prise femelle d'extension de luminaire
LEX-R
interface côté luminaire montée sur une surface extérieure conçue pour s'accoupler avec un
LEX-BP ou un LEX-C
Note 1 à l'article: La prise femelle d'extension du luminaire (LEX-R) peut être intégrée ou peut faire partie intégrante
du luminaire.
3.3
module d'extension de luminaire
LEX-M
dispositif équipé d'un LEX-BP, destiné à être monté sur un luminaire équipé d'un LEX-R
3.4
culot d'extension de luminaire
LEX-C
culot sans contacts électriques et conçu pour s'accoupler avec un LEX-R
3.5
bus d'extension de luminaire
LEX-B
bus électrique à l'intérieur d'un luminaire, avec son pôle de montage
4 Généralités
Les composants de l'interface électromécanique spécifiés dans le présent document doivent
être conformes à l'IEC 63494-1:2026. Les exigences relatives au marquage sont spécifiées à
l'Article 5 du présent document. L'Article 6 du présent document spécifie les exigences relatives
à l'interface électromécanique du luminaire. Les Articles 7 à 10 du présent document sont
alignés sur les exigences de sécurité de l'IEC 63494-1:2026. L'Annexe A fournit des exigences
sur les groupes d'essais et les calibres. l'Annexe B fournit des informations utiles pour la
conception des luminaires et des modules d'extension de luminaire
Les dimensions mécaniques sont données pour une température de (25 ± 5) °C.
Toutes les longueurs sans indication explicite de l'unité sont exprimées en millimètres.
5 Marquage
5.1 Identification du produit
L'IEC 63494-1:2026, 5.1 s'applique.
5.2 Caractéristiques du produit
L'IEC 63494-1:2026, 5.2 s'applique.
5.3 Durabilité et lisibilité
L'IEC 63494-1:2026, 5.3 s'applique.
6 Vue d'ensemble et dimensions de l'interface électromécanique
6.1 Vue d'ensemble
La Figure 1 fournit une vue d'ensemble d'un luminaire équipée d'une prise femelle d'extension
de luminaire, d'un culot d'extension de luminaire et d'un module d'extension de luminaire avec
une plaque de base d'extension de luminaire. La prise femelle d'extension du luminaire est
généralement montée sur l'extérieur du luminaire, mais peut également être montée à l'intérieur
de celui-ci. Les contacts de cette prise sont généralement connectés à l'électronique interne du
luminaire.
Figure 1 – Module, culot et prise femelle d'extension de luminaire dans un système
Le module d'extension du luminaire est une unité distincte qui peut facilement être fixée à la
prise femelle d'extension du luminaire au moyen d'un verrouillage rotatif. En règle générale, il
comporte des fonctionnalités supplémentaires pour étendre les fonctionnalités du système
complet.
Le culot d'extension du luminaire est une unité distincte qui peut également facilement être
fixée à la prise femelle d'extension du luminaire au moyen d'un verrouillage rotatif. Sa fonction
est de recouvrir et de protéger la prise femelle d'extension du luminaire en l'absence de LEX-M.
Les interfaces suivantes sont spécifiées dans le présent document:
– interface mécanique entre le LEX-R et le LEX-BP;
– interface mécanique entre le LEX-R et le LEX-C;
– zone limite d'inclusion du LEX-M;
– zone limite d'exclusion du luminaire pour permettre le montage du LEX-M ou du LEX-C;
– interface électrique et de communication entre le ou les LEX-R du luminaire et un ou deux
LEX-M.
6.2 Dimensions de l'interface mécanique
6.2.1 Plaque de base d'extension de luminaire
La plaque de base d'extension du luminaire (LEX-BP) doit être conforme
...
IEC 63494-2-1 ®
Edition 1.0 2026-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Lighting systems - Electro-mechanical interfaces -
Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
Systèmes d'éclairage - Interfaces électromécaniques -
Partie 2-1: Interface très basse tension à verrouillage rotatif (twist-lock) à quatre
broches de type ZB18
ICS 29.140.50 ISBN 978-2-8327-1059-3
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CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General . 8
5 Marking . 8
5.1 Product identification . 8
5.2 Product characteristics . 8
5.3 Durability and legibility . 8
6 Electro-mechanical interface overview and dimensions . 9
6.1 Overview . 9
6.2 Mechanical interface dimensions . 9
6.2.1 Luminaire extension base plate . 9
6.2.2 Luminaire extension cap . 12
6.2.3 Luminaire extension module . 12
6.2.4 Luminaire extension receptacle . 12
7 Mechanical safety . 13
7.1 Physical protection during insertion and removal of lighting system devices . 13
7.1.1 General. 13
7.1.2 Withstand torque test . 14
7.2 Physical safety in latching release mechanisms . 14
7.3 Protection against damaging pins during insertion . 14
7.4 Mechanical strength . 14
7.4.1 General. 14
7.4.2 Base plate tests . 14
7.4.3 Receptacle tests . 14
7.5 Retention force and torque . 14
7.5.1 General requirements . 14
7.5.2 Receptacle tests . 14
7.5.3 Base plate tests . 15
7.6 Bending moment. 15
7.6.1 Base plate bending moment . 15
7.6.2 Receptacle bending moment . 15
7.6.3 Compliance . 15
8 Electrical safety . 15
8.1 Electric shock protection . 15
8.2 Electric insulation . 15
8.2.1 General. 15
8.2.2 Insulation classification. 15
8.2.3 Electric strength . 15
8.2.4 Creepage and clearance distances . 16
8.2.5 Live insertion and disconnection . 16
8.3 Electrical interchangeability . 16
8.4 Endurance tests . 16
8.4.1 Heat aging . 16
8.4.2 Contact resistance . 16
9 Ambient condition safety . 17
9.1 Ingress protection – IP rating . 17
9.1.1 General. 17
9.1.2 IP test – Receptacles . 17
9.1.3 IP test – Base plate or protective cover . 17
9.2 Rough service . 17
10 Construction. 17
10.1 Current carrying parts . 17
10.2 Resistance to heat, fire and tracking . 17
10.3 Polarisation . 17
10.4 Protection against corrosion . 17
Annex A (normative) Test sequence and gauges . 18
A.1 General . 18
A.2 Luminaire extension module base plate (LEX-BP) gauges . 19
A.2.1 Mechanical stop gauge . 19
A.2.2 Gauge receptacle. 20
A.3 Luminaire extension receptacle (LEX-R) gauges . 20
A.3.1 Retention gauge . 20
A.3.2 Reference luminaire extension module . 21
A.3.3 Contact making . 21
A.3.4 Aging module . 22
Annex B (informative) Information for luminaire and luminaire extension module
design . 23
B.1 General . 23
B.2 Luminaire extension receptacle exclusion limit zone . 23
B.3 Electrical and communication interface . 23
B.3.1 General. 23
B.3.2 General specifications . 24
B.3.3 Pin assignment . 24
B.3.4 Auxiliary power supply at the LEX-R . 25
B.3.5 Auxiliary power consumption for the LEX-M . 25
B.3.6 Communication . 25
Bibliography . 27
Figure 1 – Luminaire extension module, cap and receptacle in a system . 9
Figure 2 – Mechanical interface of the LEX-BP: View 1 . 10
Figure 3 – Mechanical interface of the LEX‐BP: View 2 . 10
Figure 4 – Details of the mechanical interface of the LEX‐BP: section B‐B. 11
Figure 5 – Details of the mechanical interface of LEX‐BP: sections C‐C and D‐D . 11
Figure 6 – Details of the mechanical interface of the LEX‐BP: section E‐E. 12
Figure 7 – Mechanical interface of the LEX-R . 13
Figure 8 – Detail of the mechanical interface of the LEX-R . 13
Figure A.1 – Dimensions of the mechanical stop gauge . 19
Figure A.2 – Mechanical drawing of the retention gauge . 20
Figure A.3 – Inclusion limit zone of the LEX-M . 21
Figure A.4 – Mechanical drawings of the contact making gauge minimum and
maximum . 22
Figure B.1 – Gasket area and luminaire exclusion limit zone . 23
Figure B.2 – Overview of the luminaire with LEX-Rs and LEX-Ms . 24
Table 1 – Elemental composition in plating of contacts for LEX-BP and LEX-R . 12
Table A.1 – Test groups and gauges . 18
Table B.1 – Characteristics of the type A LEX-M and the type B LEX-M . 24
Table B.2 – Assignments of contacts in the LEX-M and the LEX-R . 25
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Lighting systems - Electro-mechanical interfaces -
Part 2-1: Four-pin extra-low-voltage twist-lock interface Type ZB18
FOREWORD
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63494-2-1 has been prepared by IEC technical committee 34: Lighting. It is an International
Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
34/1412/FDIS 34/1426/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.
A list of all parts in the IEC 63494 series, published under the general title Lighting systems -
Electro-mechanical interfaces, can be found on the IEC website.
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.
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.
INTRODUCTION
The IEC 63494-2 series of standards are intended to provide detailed specifications,
requirements, information and any useful gauges for particular electro-mechanical interfaces
used in lighting systems. The parts of the IEC 63494-2 series augment and refer to IEC 63494-1,
the safety standard for general electro-mechanical interfaces used in lighting systems. Detailed
specifications for both luminaire-side and device-side interfaces are included. The structure of
each document in the IEC 63494-2 series parallels that of IEC 63494-1 for ease of reference.
A testing sequence and useful gauges are provided in Annex A of each document. Information
useful for luminaire and device design can be found in subsequent annexes.
1 Scope
This part of IEC 63494-2 specifies the interchangeability requirements of an electro-mechanical
interface with four-pin extra-low-voltage (ELV) twist-lock interface – type ZB18 for use in lighting
systems. This twist-lock interface has four electrical contacts that are suitable for ELV voltages.
Two connections are intended for supply power and two are intended for digital communication.
This document specifies interchangeability related requirements for mechanical, electrical,
ambient conditions, positional orientation, communication protocol and pin assignments for the
interface. Specific requirements for the devices that can utilize the interface such as sensors,
communication modules, cameras, etc., are not within the scope of this document. This
document does not specify the following aspects:
– the lighting technology,
– the illumination performance,
– electromagnetic compatibility (EMC).
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.
IEC 60050-845, International Electrotechnical Vocabulary (IEV) - Part 845: Lighting, available
at https://www.electropedia.org
IEC 60598-1:2024, Luminaires - Part 1: General requirements and tests
IEC 60664-1:2020, Insulation coordination for equipment within low-voltage supply systems -
Part 1: Principles, requirements and tests
IEC 60664-1:2020/AMD1:2025
IEC 62504, General lighting - Light emitting diode (LED) products and related equipment -
Terms and definitions
IEC TS 63105, Lighting systems and related equipment - Vocabulary
IEC 63494-1:2026, Lighting systems - Electro-mechanical interfaces - Part 1: Safety
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-845 (IEV),
IEC TS 63105, IEC 62504, IEC 63494-1, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
luminaire extension base plate
LEX-BP
device-side interface designed to mate with a LEX-R
Note 1 to entry: The base plate can be an integral or a separable part of the luminaire extension module.
3.2
luminaire extension receptacle
LEX-R
luminaire-side interface mounted on an exterior surface designed to mate with a LEX-BP or a
LEX-C
Note 1 to entry: The luminaire extension receptacle (LEX-R) can be a built-in part or an integral part of the luminaire
3.3
luminaire extension module
LEX-M
device having a LEX-BP, intended to be mounted on a luminaire having a LEX-R
3.4
luminaire extension cap
LEX-C
cap having no electrical contacts and designed to mate with a LEX-R
3.5
luminaire extension bus
LEX-B
electrical bus within a luminaire and its mounting pole
4 General
Electro-mechanical interface components specified in this document shall comply with
IEC 63494-1:2026. Marking requirements are specified in Clause 5 of this document. Clause 6
of this document specifies requirements for the luminaire electro-mechanical interface.
Clause 7 to Clause 10 of this document parallel the safety requirements in IEC 63494-1:2026.
Annex A provides requirements on test grouping and gauges. Annex B provides information
useful for luminaire and luminaire extension module design.
Mechanical dimensions refer to a temperature of (25 ± 5) °C.
All lengths that omit an explicit unit indication are in millimetres.
5 Marking
5.1 Product identification
IEC 63494-1:2026, 5.1 applies.
5.2 Product characteristics
IEC 63494-1:2026, 5.2 applies.
5.3 Durability and legibility
IEC 63494-1:2026, 5.3 applies.
6 Electro-mechanical interface overview and dimensions
6.1 Overview
Figure 1 gives an overview of a luminaire with luminaire extension receptacle, a luminaire
extension cap and a luminaire extension module with a luminaire extension base plate. The
luminaire extension receptacle is typically mounted on the exterior of the luminaire but can also
be mounted on the interior of the luminaire and the contacts of this receptacle are typically
connected to the luminaire internal electronics.
Figure 1 – Luminaire extension module, cap and receptacle in a system
The luminaire extension module is a separate unit which can easily be attached to the luminaire
extension receptacle by means of a twist-lock. Typically, it holds additional functionality to
extend the functionality of the whole system.
The luminaire extension cap is a separate unit which can also easily be attached to the luminaire
extension receptacle by means of a twist-lock. The functionality is to cover and protect the
luminaire extension receptacle if no LEX-M is used.
The following interfaces are specified in this document:
– The mechanical interface between the LEX-R and the LEX-BP.
– The mechanical interface between the LEX-R and the LEX-C.
– The inclusion limit zone of the LEX-M.
– The exclusion limit zone of the luminaire to allow mounting of the LEX-M or LEX-C.
– The electrical and communication interface between the LEX-R(s) of the luminaire and one
or two LEX-M(s).
6.2 Mechanical interface dimensions
6.2.1 Luminaire extension base plate
The luminaire extension base plate (LEX-BP) shall comply with the specifications in Figure 2,
Figure 3, Figure 4, Figure 5 and Figure 6. Unless indicated otherwise in the figures, the
tolerance on linear dimensions is ± 0,12 mm and the tolerance on angular dimensions is ± 1,0°.
The outer diameter of the LEX-BP shall be less than or equal to 89 mm.
The sealing surface shall be free of obstacles that can prevent mating.
Compliance is checked by measurement.
NOTE X-axis and Y-axis coincide with the centerline of locking points as specified in Figure 5. The position of the
electrical contacts can be found starting from the angle M07 referenced from the centerline of the locking points.
Figure 2 – Mechanical interface of the LEX-BP: View 1
NOTE 1 Section A-A not used
NOTE 2 Section B-B coincides with the X-axis
Figure 3 – Mechanical interface of the LEX‐BP: View 2
Figure 4 – Details of the mechanical interface of the LEX‐BP: section B‐B
NOTE Mechanical stop feature plane is positioned considering dimension R08 in Figure 8.
Figure 5 – Details of the mechanical interface of LEX‐BP: sections C‐C and D‐D
Figure 6 – Details of the mechanical interface of the LEX‐BP: section E‐E
The contact areas of the LEX-BP contacts are indicated by the “Contact Area” in Figure 6. The
contact areas of each contact of the LEX-BP shall be completely tin plated on both sides
according to the elemental composition restrictions shown in Table 1. The contacts shall not
have sharp edges in the contact area.
Compliance is checked by inspection and assessment of the relevant material data sheet.
Table 1 – Elemental composition in plating of contacts for LEX-BP and LEX-R
Element % mass
Tin ≥ 97,5
Copper ≤ 1,5
Zinc ≤ 0,7
Total unnamed elements ≤ 0,2
Lead ≤ 0,1
6.2.2 Luminaire extension cap
For the luminaire extension cap, the mechanical interface requirements of 6.2.1 apply except
that the luminaire extension cap shall not have contacts.
Compliance is checked by measurement.
6.2.3 Luminaire extension module
For the luminaire extension module, the mechanical interface requirements of 6.2.1 apply.
Compliance is checked by measurement.
6.2.4 Luminaire extension receptacle
The luminaire extension receptacle shall comply with the specifications in Figure 7 and Figure 8.
Unless indicated otherwise in the figures, the tolerance on linear dimensions is ± 0,12 mm and
the tolerance on angular dimensions is ± 1,0°.
Compliance is checked by measurement.
NOTE X-axis and Y-axis coincide with centerline of locking point as specified in Figure 8.
Figure 7 – Mechanical interface of the LEX-R
Figure 8 – Detail of the mechanical interface of the LEX-R
The LEX-R contacts shall be tin plated according to the elemental composition restrictions
shown in Table 1.
Compliance is checked by inspection and assessment of the relevant material data sheet.
7 Mechanical safety
7.1 Physical protection during insertion and removal of lighting system devices
7.1.1 General
IEC 63494-1:2026, 7.1 applies. The test for LEX-M modules or LEX-BP baseplates shall be
performed with the mechanical stop gauge specified in A.2.1. The test for LEX-R receptacles
shall be performed with the retention gauge specified in A.3.1 (see 7.5.2).
7.1.2 Withstand torque test
When mated with a gauge as specified in A.2.1, the mechanical stop features of the LEX-M
module or LEX-BP base plate under test shall withstand torque stresses during insertion and
removal.
Compliance is checked by application of a 5,0 Nm torque to the LEX-M module or LEX-BP base
plate under test while inserted into the mechanical stop gauge. During application, there shall
be no slippage in the gauge. Upon removal from the gauge, there shall be no physical damage.
7.2 Physical safety in latching release mechanisms
This electro-mechanical interface has no latching mechanism.
7.3 Protection against damaging pins during insertion
IEC 63494-1:2026, 7.3 applies.
7.4 Mechanical strength
7.4.1 General
IEC 63494-1:2026, 7.4.1 applies.
7.4.2 Base plate tests
IEC 63494-1:2026, 7.4.2 applies.
The gauge receptacle specified in A.2.2 shall be used for these tests.
7.4.3 Receptacle tests
IEC 63494-1:2026, 7.4.3 applies.
The reference luminaire extension module specified in A.3.2 shall be used for these tests.
7.5 Retention force and torque
7.5.1 General requirements
IEC 63494-1:2026, 7.5.1 applies.
7.5.2 Receptacle tests
The retention torque test shall be carried out with the retention gauge specified in A.3.1 and
the following procedure shall be applied:
– Mount the LEX-R under test, including the gasket according to the manufacturer’s
instructions, on a flat plate. The gasket area as specified in Figure B.1 shall be free of
obstacles that can prevent mating.
– Perform five mating sequences with the retention gauge specified in A.3.1 and the LEX-R
under test. The test shall be performed without applying any axial force.
– Measure the torque required to detach the retention gauge from the LEX-R under test.
During this measurement no axial force shall be applied.
Compliance is checked as follows: after the test, the torque for removal shall be at least 1,0 Nm.
7.5.3 Base plate tests
IEC 63494-1:2026, 7.5.3 applies.
The gauge receptacle specified in A.2.2 shall be used for this test.
7.6 Bending moment
7.6.1 Base plate bending moment
IEC 63494-1:2026, 7.6.1 applies.
The gauge receptacle specified in A.2.2 shall be used for this test.
7.6.2 Receptacle bending moment
IEC 63494-1:2026, 7.6.2 applies.
The reference luminaire extension module specified in A.3.2 shall be used for this test.
7.6.3 Compliance
IEC 63494-1:2026, 7.6.3 applies.
8 Electrical safety
8.1 Electric shock protection
IEC 63494-1:2026, 8.1 applies.
8.2 Electric insulation
8.2.1 General
IEC 63494-1:2026, 8.2.1 applies.
8.2.2 Insulation classification
The type of circuit for this electro-mechanical interface is FELV.
Insulation requirements of IEC 60598-1:2024, Table T.1 for FELV circuits apply.
8.2.3 Electric strength
IEC 63494-1:2026, 8.2.3 applies.
The reference luminaire extension module specified in A.3.2 shall be used for the electric
strength test.
In addition, the impulse voltage dielectric test specified in IEC 60664-1:2020, 6.2.2.1 and in
IEC 60664-1:2020/AMD1:2025, 6.2.2.1 shall be conducted with a surge withstand test voltage
of 10 kV applied between the contacts of the receptacle and the rigid metal support surface.
Compliance: No puncture or partial breakdown of the insulation shall occur during the test.
8.2.4 Creepage and clearance distances
IEC 63494-1:2026, 8.2.4 applies.
For the LEX-BP base plate, the test is carried out on the interface alone and mounted on a
LEX-R receptacle.
For the LEX-R receptacle, the test is carried out using an interface in each of the following
configurations:
– with a LEX-BP base plate installed,
– with a LEX-C cap installed,
– with no device installed.
8.2.5 Live insertion and disconnection
IEC 63494-1:2026, 8.2.5 applies, with the contact making gauges specified in A.3.3:
– Contact making – maximum (Figure A.4, DIM X),
– Contact making – minimum (Figure A.4, DIM Y).
8.3 Electrical interchangeability
IEC 63494-1:2026, 8.3 applies.
The test procedure for testing the LEX-R contact making shall be as follows:
– Mount the LEX-R under test, including the gasket according to the manufacturer’s
instructions, on a flat plate.
– Attach the contact making gauge – minimum (specified in A.3.3.2) to the LEX-R under test.
Check whether the gauge fits the LEX-R under test without undue force and whether all four
electrical connections are established.
– Attach the contact making gauge – maximum (specified in A.3.3.1) to the LEX-R under test.
Check whether the gauge fits the LEX-R under test without undue force and whether all four
electrical connections are established.
Compliance is checked as follows: The luminaire extension receptacle under test passes the
test of this Subclause 8.3 if the test result confirms that both gauges fit the LEX-R and if, with
both gauges, all four electrical connections are established.
8.4 Endurance tests
8.4.1 Heat aging
IEC 63494-1:2026, 8.4.1 applies.
The aging module specified in A.3.4 shall be used.
8.4.2 Contact resistance
IEC 63494-1:2026, 8.4.2 applies.
9 Ambient condition safety
9.1 Ingress protection – IP rating
9.1.1 General
If the manufacturer of the electro-mechanical interface device claims that the interface is
protected against moisture (drips, rain, splashes, etc.), dust (proof or tight), or solid objects,
then compliance with 9.1.2 and 9.1.3 is necessary.
9.1.2 IP test – Receptacles
IEC 63494-1:2026, 9.1.2 applies.
The reference luminaire extension module specified in A.3.2 shall be used for these tests.
9.1.3 IP test – Base plate or protective cover
IEC 63494-1:2026, 9.1.3 applies.
The gauge receptacle specified in A.2.2 shall be used for this test.
9.2 Rough service
IEC 63494-1:2026, 9.2 applies.
10 Construction
10.1 Current carrying parts
IEC 63494-1:2026, 10.1 applies unless otherwise specified in this document (see 6.2.1 and
6.2.4).
10.2 Resistance to heat, fire and tracking
IEC 63494-1:2026, 10.2 applies.
10.3 Polarisation
IEC 63494-1:2026, 10.3 applies.
NOTE Type ZB18 interfaces are designed to prevent improper polarization during mating.
10.4 Protection against corrosion
IEC 63494-1:2026, 10.4 applies.
Annex A
(normative)
Test sequence and gauges
A.1 General
Table A.1 shows test groups, test order and gauges specified for testing type ZB18 four-pin
ELV twist-lock electro-mechanical interfaces. The test group and sequential order is provided
for the convenience of initial testing, aging and more severe stress testing in a logical order.
Table A.1 – Test groups and gauges
Test Test Subclause Base plate Receptacle
group
and
order
1 Insertion or Removal 7.1
Withstand torque Mechanical
stop gauge
(Figure A.1)
1 Latching release 7.2 No gauge No gauge
mechanisms
1 Pin damage during 7.3 No gauge No gauge
insertion
1 Impact – Mechanical 7.4.1 No gauge No gauge
strength
1 Impact – Base plate 7.4.2 Gauge N.A.
tests receptacle
(A.2.2)
1 Impact – Receptacle 7.4.3 N.A. Reference luminaire
tests extension module
(A.3.2)
1 Retention force and 7.5.2 N.A. Retention gauge
torque – Receptacle (Figure A.2)
1 Retention force and 7.5.3 Gauge N.A.
torque – Base plate receptacle
(A.2.2)
1 Base plate bending 7.6.1 Gauge N.A.
moment receptacle
(A.2.2)
1 Receptacle plate 7.6.2 N.A. Reference luminaire
bending moment extension module
(A.3.2)
2 Electric shock protection 8.1 No gauge No gauge
Dielectric withstand Reference luminaire
2 8.2.3 N.A.
voltage extension module
(A.3.2)
2 Creepage and clearance 8.2.4 No gauge No gauge
2 Live insertion or 8.2.5
disconnection
N.A. Contact making –
Contact making – maximum (Figure A.4,
Receptacle DIM X)
Contact making –
minimum (Figure A.4,
DIM Y)
2 Electrical 8.3 No gauge No gauge
interchangeability
Test Test Subclause Base plate Receptacle
group
and
order
2 Rough service 9.2 No gauge No gauge
2 Current carrying parts 10.1 No gauge No gauge
2 Polarisation 10.3 No gauge No gauge
3 Heat aging 8.4.1 N.A. Aging module (A.3.4)
4 Contact resistance 8.4.2 No gauge No gauge
4 IP test – Receptacles 9.1.2 N.A. Reference luminaire
extension module
(A.3.2)
4 IP test – Base plate or 9.1.3 Gauge N.A.
protective cover receptacle
(A.2.2)
5 Resistance to heat, fire 10.2 No gauge No gauge
and tracking
5 Corrosion 10.4 No gauge No gauge
A.2 Luminaire extension module base plate (LEX-BP) gauges
A.2.1 Mechanical stop gauge
The mechanical stop gauge specified in Figure A.1 shall be used to test the mechanical stop
features of the luminaire extension module (LEX-M) or base plate (LEX-BP) under test.
Figure A.1 – Dimensions of the mechanical stop gauge
A.2.2 Gauge receptacle
A gauge receptacle shall be constructed as specified in 6.2.4, with dimension R11 (Figure 8)
set to 0,48 (+0,00; −0,12) mm. This represents a worst-case minimal coupling to a luminaire
extension module. The gauge receptacle gasket shall be selected to comply with the general
requirements of 7.5.1 when mated with a reference luminaire extension module as specified in
A.3.2. The gauge receptacle gasket shall be contained entirely within the gasket area as
specified in Figure B.1.
A.3 Luminaire extension receptacle (LEX-R) gauges
A.3.1 Retention gauge
The retention gauge specified in Figure A.2 shall be used to test the LEX-R for the following:
– mating insertion and removal torque;
– suitable gasket construction for one-handed mating and removal;
– an obstacle free gasket area (see Figure B.1).
Figure A.2 – Mechanical drawing of the retention gauge
A.3.2 Reference luminaire extension module
A reference luminaire extension module shall be constructed on a luminaire extension base
plate as specified in 6.2.1, with dimension M25 (Figure 5) set to 3,63 (+0,00; −0,12) mm. This
represents a worst-case minimal coupling to a luminaire extension receptacle. The reference
luminaire extension module shall have a cover comprising a non-conducting rigid plastic
material rigidly affixed to the base plate. The outer dimensions of the cover shall fill at least
85 % of the volume of the luminaire extension module (LEX-M) inclusion limit zone as specified
by the green area of Figure A.3.
Figure A.3 – Inclusion limit zone of the LEX-M
The reference luminaire extension module shall withstand a 10,0 J impact without breaking or
deformation.
The reference luminaire extension module shall have a mass of 0,5 kg ± 0,1 kg.
A.3.3 Contact making
A.3.3.1 Contact making gauge – maximum
The contact making gauge – maximum specified in Figure A.4 shall be used to test the electrical
contacts of the LEX-R under test. The maximum gauge is constructed with a specification on
the outer diameter (DIM X) of the gauge contacts.
Figure A.4 – Mechanical drawings of the contact making gauge minimum and maximum
A.3.3.2 Contact making gauge – minimum
The contact making gauge – minimum specified in Figure A.4 shall be used to test the electrical
contacts of the LEX-R under test. The minimum gauge is constructed with a specification on
the inner diameter (DIM Y) of the gauge contacts.
A.3.4 Aging module
An aging module is a specially constructed luminaire extension module used for the heat aging
endurance test in 8.4.1. The aging module shall be constructed on a luminaire extension base
plate as specified in 6.2.1, with dimension M25 (Figure 5) set to 3,87 (+0,12; −0,00) mm. This
represents a worst-case maximal coupling to a luminaire extension receptacle. The aging
module shall have a cover comprising a non-conducting material rigidly affixed to the base plate.
The outer dimensions of the cover shall fill at least 85 % of the volume of the luminaire extension
module (LEX-M) inclusion limit zone as specified by the green area of Figure A.3.
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