NEMA vs Zhaga: Outdoor Luminaire Dimming Sockets
Outdoor luminaires use standardized dimming sockets so you can swap a sensor or driver without rewiring. NEMA C136.41 and Zhaga Book 18 are the two standards buyers meet - different shape, different ecosystem.
NEMA ANSI C136.41
The 7-pin (or 5-pin) twist-lock receptacle on top of North American street lights. It carries photocell and dimming (0-10V / constant) signals. Mature, rugged, ubiquitous in US outdoor lighting.
Zhaga Book 18
A circular, hot-pluggable socket (often with a central pin) defined by the Zhaga consortium. It carries D4i digital addressing so a driver, sensor or node identifies itself on the DALI bus.
Key Difference
NEMA is analog/standard-dim centric and regionally US-led. Zhaga Book 18 is digital (D4i), hot-plug, and global - you can add a D4i sensor without an electrician.
Which to Specify
US retrofit with simple photocell -> NEMA. New smart-city or DALI-2/D4i networked luminaire -> Zhaga Book 18.
Are NEMA and Zhaga interchangeable?
No - different mechanical and signal specs. Pick one ecosystem per luminaire.
What is D4i in this context?
D4i is the DALI standard for intelligent, self-describing luminaire components; Zhaga Book 18 is the socket that carries it.
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