Control Unit (CU-4E-NME/NMI)

Download the Control Unit (CU-4E-NME/NMI) Installation Guide.


The Enlighted Nipple Mount Control Unit is designed for field installation applications. It is available in two models: connecting to sensors externally to the luminaire and the other for connecting to sensors mounted internally to the luminaire. The Control Unit interfaces with Enlighted sensors and ballast or LED driver to control light behavior intelligently. The power metering chip within the Control Unit enables the Enlighted control network to measure power in real-time as well as energy consumption over time.

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Shipped Components

  • CU4E-NME/NMI: Control Unit - Nipple Mount External/Internal
  • Lock Nut

Items you may Need

  • Mounting screws or clips

Tools you may Need

  • Wire stripper
  • Screwdriver
  • Pliers


A qualified electrician must perform installation and maintenance under local, state, and national electrical codes (NEC) and requirements.


Two Control Unit (CU) models exist:

1. CU Nipple Mount External (CU-4E-NME): If the sensor is mounted outside of the fixture, use the


 2. CU Nipple Mount Internal (CU-4E-NMI): If the sensor is mounted within the fixture, use the
     CU-4E-NMI model. 


The CU-4E NME/NMI can be mounted either to a junction box or to a fixture. 

Note: In some cities, such as Chicago, the CU must be installed inside a metal enclosure, such as a 4-inch x 4-inch junction box. Refer to the CU-4E-NME/NMI Inside of a J-Box.

Step 1: Switch off the circuit breaker supplying power to the power supply box or the luminaire.

Step 2: Loosen the two screws on the junction box's cover plate and slide out the cover plate. Remove a ½" knockout on the J-box.


Step 3: Route the wires from the CU through the knockout hole and pull the wires into the box.


Step 5: When routing the wires through the knockout, route the cables through the lock nut.

Step 6: Thread the lock nut to the CU nipple on the J-box inside and tighten the locknut. 

Step 7: The two groups of wires, high and low voltage wires, must be connected and handled according to the code requirements. 


CU-4E-NME/NMI Inside of a J-Box

Step 1: If you plan to mount the CU inside a 4-inch x 4-inch J-box, mount the CU with the mounting nipple protruding into the adjoining J-box, as shown. Use the lock nut on the CU nipple to secure both J-boxes together. Route the wires in the adjacent J-box as per the instructions in the Wiring Procedure section.


Wiring Procedure

Wiring the High Voltage Wires

Refer to the CU4-NME/NMI Line diagrams for details. 

Step 1: Connect the CU power input wires to the branch circuit feed (black=Line, white=Neutral) using wire nuts. Make the connections in the J-box per code.

Step 2: If the CU (blue) wire is not used, cap the blue conductor with a wire nut. If the CU (blue) wire is used, route it to the unswitched load.

Step 3: Connect the switched-line (red) wire from the CU to the driver line-in terminal.

Step 4: Connect the neutral (white) wire from the CU to the driver neutral-in terminal.

Step 5: If using multiple drivers, connect all driver AC inputs in parallel.

Wiring the Low Voltage Wires

Note: Per NEC and local code compliance, DO NOT connect the low voltage wires in the same J-box as the high voltage wires. The low voltage wires are enclosed in a 600V rated sleeve sufficiently long to pass through the high voltage J-Box, eliminating the need for further separation or barrier. Use a bushing or clamp in the knockout where the low voltage wires exit the J-box through the knockout.

The CU4-NME/NMI can connect to two dimming ballasts on two separate channels (channels A and B). Channel A is violet wire; channel B is violet/white wire.

  • For single-channel dimming, use channel A wire only.
  • For multiple dimming drivers on the same channel, you may connect the dimming wires in parallel (violet to violet and pink* to pink*) for all drivers on that channel.

For dual channel Tunable White applications,

Step 1: Connect the violet wire (+) from the dimming driver to channel A violet wire on the CU for intensity.

Step 2: Connect the violet wire (+) from the dimming driver to channel B violet/white wire on the CU for color.

Step 3: Connect the pink* wire (-) from the intensity dimming driver to either pink* wire from the CU. Repeat for Channel B (color) if required.

Step 4: If using only one of the pink* wires, cap the unused pink* wire.

The dimming wires may be connected in parallel as two separate groups for dimming intensity and color for multiple dimming drivers.

The pink wire will be a grey colored wire for units built before the regulation, NFPA 70 (NEC) Article 410.69, became effective on January 1, 2022.

Step 5

NMI (Internal) only: Connect the sensor by plugging the RJ-45 connector from the CU-4 NMI cable into the RJ-45 jack of a High-bay sensor or use a coupler (CPL-RJ45) to connect to a Micro or Ruggedized sensor. Refer to Step 7 diagram.

NME (External) only: Plug the sensor cable RJ-45 plug into the RJ-45 jack on the CU-4E-NME top cover, as shown below. If the CU is installed inside of a J-box, use an extended height box (or an extender ring) so the sensor cable fits inside the box without being crushed.  Use a snap bushing in the knockout hole to protect the cable exiting the J-box.


Alternate Wiring for Relay or Contactor

Step 1: Confirm that the relay or contactor coil and contacts are rated for the AC voltage that the CU will be connected to.

Step 2: Mount the relay or contactor as per the manufacturer's instructions.

Step 3: Connect the switched (red) and neutral (white) wires from the CU to the relay or contactor coil.

Step 4: Connect the unswitched (blue) wire from the CU to the relay or contactor input.

Step 5: Connect a wire to the relay or contactor output contact, connected to the driver line-in terminal. Refer to Step 3 in the Wiring the High Voltage Wires section.

Step 6: Connect the neutral (white) wire from the standard neutral from the branch circuit to the driver neutral-in terminal. Refer to Step 4 in the Wiring the High Voltage Wires section.

Step 7: Connect the dimming circuit directly to the drivers, as described in the Wiring the Low Voltage Wires section.

Completing the Installation

Step 1 (NME): If the sensor is mounted outside of the luminaire, use a snap bushing in the knockout hole on the lighting fixture to route and protect the sensor cable.

Step 2: Bend wires into place such that the J-box cover can easily be reattached.

Step 3: Install the covers for the J-box and ballast cavity, apply power to the newly wired lighting fixture, or turn the power on to the power-supply box.

Step 4: The lights should turn on to a full bright state and then may cycle or dim, based on the sensor commissioning status or programming.

Product Compliance

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Model No: CU-4E-NME/NMI

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