If you are wiring a raw potentiometer (pot) to control a commercial or high-end residential 0-10V LED dimming driver, the direct answer is to use a 10kΩ linear taper potentiometer. Wire the driver’s DIM+ (source) to Pin 1, the driver’s DIM- (return) to Pin 2 (the wiper), and jumper Pin 3 to Pin 2 to prevent open-circuit flicker. Do not connect the 0-10V DC return to your AC earth ground.

This guide walks through the exact node-by-node trace, physical terminal identification, and bench verification steps to get your lighting control loop working on the first attempt.

The 0-10V Pot Wiring Diagram: Source-to-Load Trace

Before cutting any wire, you need to understand the path the control signal takes. In a standard 0-10V lighting circuit, the LED driver itself generates the 10V DC reference signal (sourcing). The potentiometer acts as a variable resistor (rheostat) to bleed off voltage, signaling the driver to lower the output current to the LEDs.

Reading the Schematic Symbols: On your driver’s wiring diagram, the potentiometer is represented by a zig-zag line (the resistive carbon track) with an arrow pointing into the middle (the wiper). The DIM+ and DIM- terminals are usually shown as a block with a plus and minus sign.

Here is the exact node-by-node trace from the power source to the control loop:

  1. AC Mains to Driver: 120V/277V AC Line (Black) and Neutral (White) land on the driver’s AC IN terminals. Earth Ground (Bare/Green) bonds to the driver chassis ground screw.
  2. Driver to LEDs: DC+ (Red) and DC- (Black) output from the driver to the LED fixture’s input.
  3. Control Loop Source: The driver’s internal 10V reference pushes DC voltage out of the DIM+ terminal.
  4. Control Wire 1: A Pink 18 AWG wire carries the 10V DC from DIM+ to Potentiometer Pin 1 (Counter-Clockwise lug).
  5. The Resistive Drop: Current travels through the carbon track. The physical rotation of the shaft moves the wiper, changing the resistance between Pin 1 and Pin 2.
  6. Control Wire 2: A Purple 18 AWG wire carries the dropped voltage from Potentiometer Pin 2 (Wiper) back to the driver’s DIM- terminal.
  7. The Jumper: A short jumper wire connects Pin 2 to Pin 3 (Clockwise lug). This ensures that if the wiper loses physical contact with the track due to dirt or vibration, the circuit defaults to maximum resistance (lights at 100%) rather than floating erratically.

Terminal Pin Mapping and Physical Identification

The most common point of failure in DIY 0-10V builds is misidentifying the wiper. If you wire the return to an outer lug, the pot will act as a fixed resistor, and your lights will not dim.

Pin Number Physical Location Internal Function Wiring Destination
Pin 1 Left lug (shaft facing you, pins down) CCW end of resistive track DIM+ (Pink 18 AWG)
Pin 2 Center lug Wiper (moving contact) DIM- (Purple 18 AWG)
Pin 3 Right lug CW end of resistive track Jumpered directly to Pin 2

Note: Pin numbering assumes you are looking at the back of the potentiometer with the shaft pointing away from you and the three terminals pointing downward. Always verify with a multimeter before making final connections.

Step-by-Step Wiring and Verification Procedure

Follow this sequence to wire and verify the circuit. This procedure assumes you are using a standard Class 1 or Class 2 0-10V sourcing LED driver.

SAFETY FIRST: De-energize the AC breaker feeding the LED driver. Lock out or tag the breaker. Verify the AC IN terminals read 0V AC with a tested multimeter before touching any wires. While the 0-10V loop is low-voltage DC, the driver’s AC input is lethal.
  1. Prep the Potentiometer: Cut a 2-inch piece of 18 AWG solid or stranded wire. Strip 1/4 inch of insulation from both ends. Solder or crimp this jumper between Pin 2 and Pin 3 on the back of the potentiometer.
  2. Prep the Control Wires: Strip 1/4 inch of insulation from your Pink (DIM+) and Purple (DIM-) 18 AWG control wires. If your driver uses push-in terminal blocks, ferrule the ends to prevent stray strands from bridging the tight 0-10V spacing.
  3. Land the Control Wires: Connect the Pink wire to the driver’s DIM+ and Pin 1 of the pot. Connect the Purple wire to the driver’s DIM- and Pin 2 of the pot.
  4. Bench Verify with a Multimeter: Before applying AC power, set your multimeter to the Ohms (Ω) setting. Place the red probe on the Pink wire and the black probe on the Purple wire at the driver end.
  5. Sweep the Shaft: Rotate the potentiometer shaft fully counter-clockwise. Your meter should read close to 10,000 Ω (10kΩ). Rotate it fully clockwise. The meter should drop smoothly to 0 Ω to 5 Ω. If the meter reads 'OL' (open loop) at any point, your wiper connection is faulty.
  6. Energize and Test: Restore AC power. The LEDs should illuminate at 100% brightness (shaft fully CCW). Slowly rotate the shaft CW. The light output should smoothly dim down to the driver's low-end trim (usually 1% to 10%).

Decision Tree: Choosing the Right Pot for Your Driver

Not all 0-10V drivers behave identically, and using an audio-taper pot instead of a linear taper will result in a highly non-linear dimming curve (the lights will drop to 20% brightness in the first 10 degrees of rotation). Use this decision matrix to select your exact component.

Driver Architecture Identifying Symptom / Datasheet Note Required Component Spec Concrete Part Pick
Standard Sourcing (95% of commercial drivers) Datasheet says '0-10V Sourcing' or 'Internal 10V reference' 10kΩ Linear Taper (B-Taper) Bourns 3852A-286-103AL
Sinking (Rare, older magnetic ballasts) Datasheet says '0-10V Sinking' or requires external 10V supply Active 0-10V Dimmer Module (Not a raw pot) Lutron GRX-TVI Interface
PWM Dimming (Addressable / Low Voltage strips) Driver has PWM, VCC, and GND terminals instead of DIM+/- 10kΩ Pot wired to a 555 Timer or Microcontroller ADC Bourns 10kΩ + Arduino Nano
The Default Recommendation: If you are building a custom control panel, sub-panel door, or bench test rig for a modern LED driver (like those from Inventronics, Philips Xitanium, or HEP), terminate your search and buy the Bourns 3852A-286-103AL. It is a 10kΩ linear (B-taper) panel-mount pot with a 1/4-inch shaft, rated for 1 million cycles, and costs roughly $4.50 at major electronics distributors. Do not use an 'A-taper' (logarithmic/audio) pot, or your dimming curve will feel broken.

Polarity, Grounding, and the DC Return Path

The final area where installations fail is confusing the 0-10V DC return (DIM-) with the AC safety Earth Ground.

The Ground Path Rule: The DIM- terminal on your LED driver is a floating DC reference return. It must never be bonded to the bare copper AC ground wire, the metal junction box, or the conduit. If you tie DIM- to Earth Ground, you will likely create a ground loop that introduces 60Hz AC hum into the DC control signal, resulting in visible flickering at the LED fixture, or you may trip the driver's internal short-circuit protection.

Polarity Matters: While a raw potentiometer is technically non-polarized (it’s just a resistor), the 0-10V control loop is polarized. If you swap the Pink and Purple wires at the driver (connecting DIM+ to the wiper and DIM- to the outer lug), the dimmer will function in reverse, or worse, the internal resistance of the wiper contact will introduce a non-linear voltage drop that prevents the driver from reaching 100% output. Always source from the outer lug (Pin 1) and return from the wiper (Pin 2).

By sticking to a 10kΩ linear taper, jumpering the wiper to the unused lug, and keeping the DC return isolated from AC ground, your 0-10V dimming circuit will operate smoothly across the entire mechanical sweep of the shaft.