How to Wire a Digital and Wi-Fi Smart LED Dimmer Switch

Electrical Technology

Wiring a Digital / Wi-Fi Smart LED Dimmer Switch with Smart Dimmer Companion Switch for Multi-Way Switching Control

A Digital LED dimmer switch is an advanced lighting control device that uses electronic (digital) circuitry to regulate the brightness of modern lighting loads such as dimmable LED, CFL, and incandescent lamps. Unlike traditional analog or rheostat dimmers, it provides precise and consistent control of light output, enabling smooth, full-range dimming without flickering or abrupt changes in intensity. These dimmers are specifically designed to match the electrical characteristics of LED drivers, ensuring stable and efficient operation.

In addition to basic dimming functionality, digital LED dimmer switches incorporate intelligent features that enhance user control and energy efficiency. For example, they can offer programmable fade-on and fade-off rates, allowing lights to gradually turn on or off, and the ability to set maximum brightness levels to reduce energy consumption. Many models also include visual indicators such as LED locator lights or brightness displays, along with memory functions that retain the last selected light level for consistent operation.

Furthermore, digital dimmer switches are designed for flexible installation and modern applications. They can operate in single-pole, three-way, or multi-location configurations, making them suitable for controlling lighting from multiple points. Some advanced versions integrate with mobile applications or wireless technologies, enabling remote control and scheduling features. Overall, a digital LED dimmer switch represents a combination of precision control, energy management, and smart functionality in contemporary lighting systems.

Smart dimmer LED switches are different from standard lighting switches. They are not wired the same for single and multi-way applications. See the folloiwing wiring diagrams.
For single load application, the wiring method is same for all digital and smart dimmer switches by Leviton i.e. DDL06, DH6HD, D26HD, D36HD, DW6HD, DDMX1, DDE06 etc.

Good to Know: The main difference between the digital and smart dimmers is that the older digital dimmer models are controlled via Bluetooth® technology, whereas the newer smart dimmer models connect through a Wi-Fi network. This allows the smart dimmers to integrate with smart home automation systems and enables remote control through compatible mobile apps and voice assistants.

Specification of Digital LED Dimmer

Name: Digital & Smart / Wi-Fi LED Dimmer
Poles: Single-Pole, 3-Way & Multiway – With and Without Neutral
Voltage: 120V Single-Phase AC Supply – 60 Hz
Current: 15A General & 5A LED/CFL or Electronic Ballast
Wattage: 300W LED & CFL – 600W Incandescent
Wire Size: #14 – #12AWG Copper
Neutral Required: NO for DDL06 – Yes for D26HD & D36HD
Bridge / HUB: NO
Termination: Wired Leads, Back Wired & Side Wired for other smart devices such as D26HD/D36HD – Screw Termination and Mounting for DDL06.
Range: 30 ft (≈ 9 meters)
Compatibility: Apple and Android smartphones. Remote control via app or manual dimming via dimmer bar on the switch.

Wiring a Smart Dimmer Switch with and without Neutral

In the following wiring tutorial, we will show various wiring diagrams for Wi-Fi based smart dimmers (such as D26HD, DW6HD & D36HD) and digital dimmers (DDL06, DDMX1 & DDE06). These diagrams illustrate installations both with and without a neutral wire and are designed in accordance with the requirements for companion devices used in multi-way lighting control systems.

To wire a Leviton smart , digital or Wi-Fi dimmer switch:

The “N” and “WH” terminals on both the smart dimmers and dimer companion switches are connected to the neutral (white) conductor, which is also tied to the neutral busbar in the main panel.
The “LINE” terminal of the smart switch is connected to the hot (black) conductor coming from the circuit breaker. The “BK” terminal (black screw) on the companion switch is not used in this configuration.
The “Green” and “G” terminals on both switches are connected to the equipment grounding conductor (bare or green wire), which is also bonded to the ground busbar in the main panel.
For three-way switching, the “T” terminal of the smart dimmer switch in Box 1 is connected to the “YL/RD” terminal of the dimmer companion switch in Box 2.
The “Load” terminal of the smart switch is connected to the load (lighting fixture) via the hot (line) conductor.

Wiring Connections for 3-Way Circuit Using Smart Dimmer Switches

Most smart devices required neutral wire connection. If neutral wire is not available in both boxes, you may use the second and third options i.e. neutral in one box or no neutral in either box (such as in old buildings). Alternatively, you may use the smart devices that doesn’t need the neutral connection at all. This case is shown in the last section of this post.

Neutral Required – When Neutral Wire is available in Both Boxes

The following wiring diagrams show a 3-way switching circuit with neutral wire in both boxes using smart dimmers (such as DDL06, D26HD, DH6HD, D36HD, DW6HD, DDMX1, DDE06) with smart switch companions (such as DD0SR, DD00R).

Good to Know: To avoid unnecessary flickering, do not share the neutral wire for smart devices. Instead, connect all smart devices to the same phase or run a separate neutral to each phase (branch circuit).

Wiring a Wi-Fi Dimmer with a Dimmer Switch Companion for 3-Way Circuit – Neutral Required

Wiring a Smart Wi-Fi Dimmer Switch with a Dimmer Companion Switch for 3-Way Circuit

Wiring a Digital Dimmer Switch with Smart Dimmer Switch Companion for 3-way wiring

Neutral Required – When Neutral Wire is available in One Box

Wiring a Digital LED Dimmer Switch with a Companion Switch for 3-Way Circuit – Neutral Wire in One Box

Wiring a Wi-Fi Dimmer with a Dimmer Companion Switch for 3-Way Switching – All in One Box

Wiring a Smart Dimmer Switch with a Companion Switch for 3-Way Switching – Neutral Required

Good to Know:

If wiring a digital dimmer (such as DDL06) with a smart switch (such as DD0SR), the neutral conductors are remain un-used (not connected) and tied together in the box.
If Neutral is available, the BK and RD terminals are not used when withing with smart companion (such as DD0SR). This case is shown in the above wiring diagrams as well as wiring of digital dimmer switch with smart companion switches.

No Neutral Required – When Neutral Wire is not available in Either Box

Wiring a Digital LED Dimmer Switch with Companion Switch for Multi-Way Switching – No Neutral

Or you may use alternative smart dimmer switch which does not require neutral connection (such as DN6HD but it requires additional MLWSB Wi-Fi Bridge for proper operation).

Good to Know:

These wiring configurations can be used for 1-pole, 3-way and multi-locations controlling.
Travelers (yellow) is especially used for 3-way wiring circuits. In case of single load, this wire is not used and must be tied via tap in the box.
In 3-way wiring, the dimmer switch must be installed on the Line (Hot) side of the circuit.

Digital Control

The Leviton smart devices can be used for lighting control using the Decora Digital Dimmer Timer App (compatible with Apple and Android smartphones). The smart dimmers, switches, fan speed controllers can be controlled using Bluetooth technology or Wi-Fi via smartphones and tablets. To add a smart device to the network, follow the step by step instructions in the My Leviton app for Decora smart devices

If there is no hub or active internet connection, the digital controls can be manually and independently used to control the lighting points via smart switches within 30 ft (9 m).

There are seven LEDs on the left side that indicate the dimming level or brightness. Their state changes either via remote control or by manually pressing the rocker switch on the right side (up to increase brightness and down to decrease it)

Troubleshooting: If the dimmer is not responding, reset to the factory setting by holding the top of the rocker on the dimmer until the locator LED starts to blink. The dimmer is now reset to the default state.

Instructions & Precautions

Make sure to disconnect the power supply by switching OFF the breaker in the main panel before doing any electrical work.
Per NEC Table – 310.16 , 210.24.(1) and 240.4(D)(4), the correct breaker and wire size for a 15-Amp, 120V circuit is #14 AWG copper. Hence, use #14 AWG copper / copper-clade conductors with 15A smart switches.
Other than built-in wires, strip 3/4″ (19 mm) for side wiring and 1/2″ (12.7 mm) for back wiring) insulation and tighten all terminal screws 14-18 in·lbs (1.6-2 N·m) of torque or as per given termination ranges.
The wire length from smart switch to other companion device should not exceed 300 ft (90 meters).
15A/120V switches and outlets/receptacles should be installed on 15A breaker only.
Smart devices are for indoor use only. Not to be used for healthcare equipment control.

Disclaimer:

The author will not be liable for any losses, injuries, or damages from the display or use of this information or if you try any circuit in wrong format. So please! Be careful because it’s all about electricity and electricity is too dangerous. If you are unsure, contact a licensed electrician to do it according to the local area codes.

Resources:

Smart Devices Wiring Series

Wiring Standard GFCI & Breakers

Wiring General Outlets & GFCI/AFCI Receptacles

Switches Wiring

Sizing Breakers, Wires, and Panels

Finding the Number of Breakers/Outlets in a Circuit