Do you want to know how to wire a 2-wire photocell? Photocells, also known as light sensors, are widely used in outdoor lighting systems. They detect daylight and adjust the light intensity accordingly. In this article, we will discuss the 2-wire photocell wiring diagram, step-by-step. This guide is aimed at beginners and professionals alike, who want to learn how to wire a photocell for their lighting system.
What is a 2-Wire Photocell?
A photocell is an electronic component that senses light and measures its intensity. It is commonly used in lighting systems to switch lights on and off automatically based on the level of daylight. A 2-wire photocell, as the name suggests, has two wires – one black and one white. It is a simple device that does not require a control box or a switch, as it is wired directly into the lighting circuit.
Advantages of 2-Wire Photocell
The 2-wire photocell is easy to install and wire, making it an ideal choice for DIY enthusiasts. It is also inexpensive and reliable, as it does not have any moving parts. Moreover, since it does not require a control box or a switch, it reduces the overall cost of the lighting system.
Disadvantages of 2-Wire Photocell
One of the main disadvantages of the 2-wire photocell is that it does not provide manual control of the lights. Since it is wired directly into the lighting circuit, it cannot be turned on or off independently of the other lights. This can be a problem if you need to turn off a specific light without affecting the others.
How to Wire a 2-Wire Photocell?
Wiring a 2-wire photocell is a simple process that can be done in a few steps. Before you begin, make sure you have the necessary tools and materials, including the photocell, wire strippers, electrical tape, and a screwdriver.
Step 1: Turn off the Power
Before you start wiring the photocell, turn off the power to the lighting circuit. You can do this by switching off the circuit breaker or removing the fuse from the electrical panel. This will prevent any accidental shock or electrocution.
Step 2: Locate the Wiring Box
Locate the wiring box for the lighting system. The wiring box is usually located near the light fixture or the electrical panel. Open the wiring box cover by unscrewing the screws or flipping the latch.
Step 3: Identify the Wires
Identify the wires in the wiring box. The wires usually include a hot wire (black), a neutral wire (white), and a ground wire (green or bare). The hot wire is the one that carries the electrical current to the light fixture.
Step 4: Connect the Photocell
Connect the photocell to the hot wire and the neutral wire. The black wire of the photocell should be connected to the hot wire, and the white wire should be connected to the neutral wire. Use wire strippers to remove the insulation from the wires, and then twist the wires together. Secure the wires with wire nuts.
Step 5: Insulate the Wires
Insulate the wires with electrical tape to prevent any accidental short circuits. Wrap the tape around the wires, covering the exposed metal. Make sure the tape is tight and secure.
Step 6: Test the Photocell
Close the wiring box cover and turn on the power. Test the photocell by covering it with a dark cloth or your hand. The light fixture should turn on when the photocell is covered and turn off when it is uncovered.
Frequently Asked Questions (FAQ)
| Question | Answer |
|---|---|
| Can a 2-wire photocell be used with LED lights? | Yes, a 2-wire photocell can be used with LED lights. However, you need to make sure that the photocell is compatible with the LED driver. LED drivers require a minimum load, and if the load is too low, the lights may flicker or not work at all. |
| What is the maximum distance between the photocell and the light fixture? | The maximum distance between the photocell and the light fixture depends on the type of wire used. For 18-gauge wire, the maximum distance is 50 feet. For 16-gauge wire, the maximum distance is 100 feet. For longer distances, you may need to use a relay or a control box. |
| What is the difference between a 2-wire and a 3-wire photocell? | A 2-wire photocell has two wires – one black and one white – which are connected directly to the hot and neutral wires of the lighting circuit. A 3-wire photocell has three wires – one black, one red, and one white – which are connected to the hot, neutral, and load wires of the lighting circuit. A 3-wire photocell provides manual control of the lights, as it has a separate load wire that can be connected to a switch or a relay. |
Conclusion
Wiring a 2-wire photocell is a simple process that can be done by following the steps outlined in this article. The 2-wire photocell is an inexpensive and reliable device that can be used in outdoor lighting systems to switch lights on and off automatically based on the level of daylight. If you have any questions or need further assistance, consult a licensed electrician or a lighting specialist.
