Zhaga Book 18 vs NEMA (ANSI C136.41)
Both standards solve the same problem — let you add a sensor or controller to a luminaire in the field — but they come from different ecosystems and look nothing alike.
Zhaga Book 18
A circular socket defined by the Zhaga Consortium (now with DiiA). It standardises the mechanical interface, the 24 V power budget and the DALI/communication lines so a Zhaga-D4i node clicks into any compliant luminaire. Dominant in European and OEM smart-lighting designs.
ANSI C136.41 (NEMA socket)
The 7-pin twist-lock receptacle used across North American outdoor lighting. It carries dimming and power lines defined by ANSI C136.41, and pairs with the larger NEMA photocontrol form factor. It is the default for US street and area lighting.
How to choose
- Region and supply chain. North America → ANSI C136.41/NEMA. EU/OEM smart platforms → Zhaga Book 18.
- Data vs photocontrol. Want D4i sensor data and memory? Zhaga-D4i. Want a robust, proven photocell/dimming node? NEMA.
- Form factor. Zhaga is low-profile and sealed for the module; NEMA is the chunky, field-serviceable twist-lock.
XGW ships both: see the Zhaga Book 18 socket and the NEMA socket (ANSI C136.41).