Overview
IEC PAS 63421:2022 (Zhaga Book 18 including Book 1) defines a standardized physical, electrical and communication interface between an outdoor LED luminaire and a detachable Luminaire Extension Module (LEX‑M). Intended for high IP‑rated outdoor applications, the specification covers the mechanical mating parts (base plate, cap, receptacle), pin assignment and electrical interfaces, auxiliary power, and supported communication (for example DALI and DALI bus power). Book 1 provides the common concepts and general requirements that underpin Zhaga interface specifications.
Key topics and requirements
- Interface structure (Part 1)
- Mechanical definitions for LEX‑M base plate, LEX‑C (cap), LEX‑R (receptacle) and the LEX‑M keep‑in/keep‑out volumes.
- Electrical and communication interface including pin assignment, insulation, auxiliary power and DALI communication/bus power.
- Plug‑and‑play intent to simplify module installation and replacement.
- Compliance tests (Part 2)
- Mechanical tests: dimensional checks, sealing surface verification, outer diameter, mechanical stop features.
- Electrical tests: pin assignment verification, AUX power consumption and DALI bus compliance.
- Mating/un‑mating tests: contact making gauges, un‑mating torque, contact plating checks.
- Test tools defined: mechanical‑stop‑gauge, contact‑making‑gauges (min/max), un‑mating‑torque‑gauge.
- Environmental & installation guidance
- Emphasis on high IP rating and outdoor robustness; application guidance includes street lighting and bottom‑mounted LEX‑M arrangements.
- Conformance
- Testable requirements for luminaires, LEX‑M modules and receptacles to ensure interoperability and field replaceability.
Applications
- Smart outdoor lighting and smart city deployments where sensors or communications nodes are added to luminaires.
- Street lighting systems that require modular sensor/communication upgrades or maintenance-friendly plug‑in modules.
- Manufacturers designing weatherproof extension modules (sensors, radios, controllers) that must be interoperable across multiple luminaire brands.
- Test labs validating compliance of LEX components and luminaires against Zhaga mechanical and electrical criteria.
Who should use this standard
- Luminaire manufacturers, module (LEX‑M) designers and suppliers
- IoT and sensor integrators for outdoor lighting networks
- Specifiers and procurement teams for municipal or roadway lighting projects
- Certification and test laboratories performing compliance testing
Related standards
- Zhaga Book 1 (common concepts and requirements) - included in this publication.
- Zhaga Book 18 (interface definition) - primary scope of IEC PAS 63421.
- Associated lighting control/communication frameworks referenced in the document include DALI and D4i for communication and bus power interoperability.
Keywords: IEC PAS 63421, Zhaga Book 18, LEX‑M, outdoor luminaire interface, DALI, D4i, IP rated luminaire, plug‑and‑play module, compliance testing, smart street lighting.