TWO-WAY SWITCH

The stair-head circuit is a type of electrical circuit that allows control of a light bulb from two different switches, usually located at the ends of a staircase or a long corridor. Here is a small tutorial on how this circuit works and how to install it:

Necessary components

• A light bulb

• Two 3-way switches (stair-head type)

• Electrical cables

• A light bulb holder

• Protection (fuses, boxes, etc.)

Circuit diagram

(Note: The image is for reference only)

How the circuit works

1. Live (L): The phase wire (red) connects to the first switch (entry to terminal L).

2. Switches: Each switch has three terminals marked „L”, „1”, and „2”. Terminals „1” and „2” of the two switches are connected together with wires.

3. Load (bulb): The phase wire leaves the last L terminal of the second switch and connects to the bulb.

4. Neutral (N): The neutral wire (blue) connects directly to the bulb.

5. Protective Earth (PE): The protective wire (green and yellow) connects to the lighting fixture at the intended contact.

Step-by-step – Installation

1. Turn off the power for safety.

2. Mount the switches in the desired locations (e.g., at the ends of a staircase).

3. Route the cables according to the diagram:

   • Connect the phase wire (L) to the first switch.

   • Connect the „1” and „2” terminals of the two switches together.

   • Connect the phase wire from the last „L” terminal of the second switch to the bulb.

   • Connect the neutral wire (N) directly to the bulb.

4. Check the connections to ensure they are securely fastened.

5. Turn on the power and test the circuit.

Functional explanation

When the switches are operated, they change the path of the electric current, allowing the light bulb to be turned on or off from either of the two locations.

Safety tips

• Consult a licensed electrician if you do not have experience in the electrical field.

• Ensure you have adequate protection, such as fuses and circuit breakers.

The stair-head circuit is very useful in areas where it is necessary to control a light bulb from two different locations, such as at the ends of a staircase. I hope this small tutorial helps you better understand how it works and how to install it correctly!