Connection diagram of a two-key pass-through switch

  • Dec 14, 2020
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The simplest switch carries an equally simple principle of operation - it is a conventional release. This means that it performs the function of disconnecting / connecting a certain section of the circuit. But there are more complex devices, for example, a two-key pass-through switch, with which you can control lighting from different points in the room.

What is a pass-through switch

First you need to figure out what a pass-through switch is. Imagine that you enter the room, turn on the light, go to the bed, lie down... and turn off the light with another switch located at the head of the bed. No need to get up again, go to the door, and then get to bed in the dark.

Pass-through switches are 2 devices with which you can control both the switching on and off of the lighting. They can be located at any distance from each other.

Figure 1: Two-key pass-through switch
Figure 1: Two-key pass-through switch

Between two pass-through switches, you can install a third, fourth, fifth, and in general, as much as you like. Only such switches are called toggle or reversible, and have a design different from the toggle device.

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Connection sequence of a two-key pass-through switch

Consider connecting a two-key pass-through switch through a junction box:

  1. Drill with a special crown the places where the switches will be located.
  2. Install the socket outlets in them and fix with putty or alabaster.
  3. Drill a place for the junction box.
  4. Prepare the grooves going from the panel to the box and from the box to the switches.
  5. Route a two-wire cable from the switchboard to the junction box. The first vein is "phase", the second is "zero".
  1. Route 2 three-core wires from each switch to the junction box. You can use one six-core, but finding one is quite problematic.

Advice! It is better to select 2 three-core wires with different markings. For example: the first is black, blue, orange, and the second is red, brown, and yellow-green. Different markings will not allow you to get confused when connecting conductors in a junction box.

7. Connect the wires to the switches according to the diagram:

Figure 2: Connecting 2-gang push-buttons through a junction box

8. Connect the wires in the junction box according to the diagram, not forgetting to connect the phase and neutral conductors from the switchboard.

As a reminder, the best way to connect the wires in the junction box is with WAGO terminals.

Connecting a two-key pass-through switch with a loop

Customers vary and some find the junction box to compromise the aesthetics of the room. In this case, pass-through switches must be connected by a loop, laying wires directly to the devices.

  • 2 two-wire for connecting switches together.
  • 1 single-core - coming from the panel to the first switch "phase".
  • 1 single-core - "phase" coming from the panel to the second switch.
  • 1 single core - for the first lamp.
  • 1 single core - for the second lamp.
Figure: 3. Connection of two-key pass-through switches by a loop

A very complex and time-consuming connection option, it is rarely used.