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Wiring 2-Way Dual Control and Zigbee Smart Switch Module

Step-by-step wiring guide for two-way switches and in-wall Zigbee relays.

From the Xiry library · Updated 3 October 2026

This wiring method demonstrates how to convert a standard single-switch light circuit into a two-way dual-control setup and integrate an in-wall Zigbee relay module. It preserves existing physical switch toggles while adding wireless and automation capabilities via Zigbee. It provides clear guidance on line, neutral, and traveler connections across switch boxes.

How it works

  1. Single Switch Wiring:
  2. Connect the neutral wire directly to the light fixture.
  3. Connect the live wire from the breaker/source to the 'L' terminal of the switch.
  4. Connect the control (switched live) wire from the 'L1' terminal of the switch to the light fixture.
  5. Dual Control (Two-Way / 3-Way Switching):
  6. Use two single-pole double-throw (SPDT / 2-way) switches.
  7. Connect the traveler terminals: 'L1' of Switch 1 connects to 'L1' of Switch 2; 'L2' of Switch 1 connects to 'L2' of Switch 2.
  8. Connect the incoming Live wire to the 'L' terminal of Switch 1.
  9. Connect the fixture's Control (switched live) wire to the 'L' terminal of Switch 2.
  10. Retrofitting Zigbee In-Wall Module:
  11. Insert the Zigbee in-wall switch module into the circuit between the switched control line, live power, and neutral line according to the module's terminal diagram.
  12. Enables control via original physical switches, mobile app, wireless scene controllers, handheld remotes, voice assistants (e.g. Alexa), and contact sensors.

What it's for

  • Convert a single light switch into a two-way switch setup across two locations
  • Retrofit an existing light circuit with an in-wall Zigbee module without replacing physical switches
  • Automate room lighting using Zigbee while retaining physical wall controls

Key points

  • Direct neutral connection from breaker panel to fixture
  • Single switch wiring using L for live feed and L1 for switched live
  • Dual-control configuration routing L1 and L2 traveler wires between two SPDT switches
  • Zigbee relay module integration into line, neutral, and switched load paths
  • Preservation of manual wall switch toggles alongside smart wireless control

Pricing

Free

Details

Type
Tip
Category
Other
Topic
Home Automation
Open source
No
Platforms
other
For
Home automation enthusiasts and DIY electricians.
Alternative to
Smart Wall Switches, Shelly 1 Relays, Sonoff ZBMINI
Tags
smart home, zigbee, electrical, wiring, lighting, diy

Why it was saved

  • @sunricher_controller, 27 May 2025: Shows the exact connections between breaker, live/neutral lines, switches (L, L1, L2 traveler lines), and a smart relay module for home automation.

Related

Updated