Lighting contactors are used to control high voltage lighting in commercial and industrial settings. These contactors are designed to handle the high electrical loads associated with lighting systems and can be wired to work with a variety of different types of lighting. One common type of lighting contactor is a 120V contactor, which is designed to work with lighting systems that operate on 120 volts. In this article, we will be discussing the wiring diagram for a 120V lighting contactor, as well as answering some commonly asked questions about these devices.
Wiring Diagram for a 120V Lighting Contactor
Before we dive into the wiring diagram for a 120V lighting contactor, it’s important to understand what a lighting contactor actually does. A lighting contactor is essentially a large relay that is designed to handle high voltage electrical loads. When a lighting contactor receives a signal to turn on, it closes a set of contacts that allows electrical current to flow to the lighting system. When the signal is turned off, the contacts open and the current flow stops.
With that basic understanding in mind, let’s take a closer look at the wiring diagram for a 120V lighting contactor:
| Terminal Number | Description | Wire Color |
|---|---|---|
| 1 | Coil Voltage | Blue |
| 2 | Neutral | White |
| 3 | Load 1 | Black |
| 4 | Load 2 | Red |
| 5 | Auxiliary Contact 1 | Yellow |
| 6 | Auxiliary Contact 2 | Orange |
As you can see, there are six terminals on a 120V lighting contactor. Let’s go through each one and explain what it does:
1. Coil Voltage (Blue)
The coil voltage terminal is where you connect the incoming power for the contactor’s coil. This is typically a low voltage signal, often 24V or 120V, depending on the application. When power is applied to this terminal, it energizes the coil and closes the contacts.
2. Neutral (White)
The neutral terminal is where you connect the incoming neutral wire. This wire completes the circuit for the contactor’s coil.
3. Load 1 (Black)
The load 1 terminal is where you connect the first load wire. This wire carries the electrical current to the first set of lights or other electrical devices that the contactor is controlling.
4. Load 2 (Red)
The load 2 terminal is where you connect the second load wire. This wire carries the electrical current to the second set of lights or other electrical devices that the contactor is controlling.
5. Auxiliary Contact 1 (Yellow)
The auxiliary contact 1 terminal is used to wire in additional control devices, such as switches or timers. When the contactor closes, it also closes this contact, which can be used to trigger other devices.
6. Auxiliary Contact 2 (Orange)
The auxiliary contact 2 terminal is the same as the auxiliary contact 1 terminal, but just provides a second contact for additional control devices.
FAQ About 120V Lighting Contactors
1. What is the maximum load rating for a 120V lighting contactor?
The maximum load rating for a 120V lighting contactor depends on the specific model and manufacturer. However, most 120V lighting contactors are designed to handle loads of up to 30 or 40 amps.
2. How do I know if a 120V lighting contactor is compatible with my lighting system?
You should consult the manufacturer’s specifications for the lighting contactor to determine if it is compatible with your specific lighting system. In general, a 120V lighting contactor will work with lighting systems that operate on 120 volts and are within the contactor’s load rating.
3. Can I wire a 120V contactor to work with a 240V lighting system?
No, a 120V lighting contactor is not designed to work with a 240V lighting system. Attempting to wire a 120V contactor to a 240V system could result in damage to the contactor or the lighting system, as well as a potential safety hazard.
4. Do I need a separate contactor for each set of lights in my lighting system?
It depends on the size of your lighting system and how it is wired. In some cases, a single contactor may be able to control multiple sets of lights. However, in larger systems, it may be necessary to use multiple contactors to properly control the load.
5. Can I install a lighting contactor myself, or should I hire a professional electrician?
It is always recommended to hire a professional electrician to install a lighting contactor, especially in commercial or industrial settings. The installation process can be complex and requires knowledge of electrical codes and safety procedures.
With this information in mind, you should be able to successfully wire a 120V lighting contactor and ensure the safe and efficient operation of your lighting system.
