An FMC connector is an electrical fitting specifically designed to attach flexible metallic conduit (FMC) to an electrical box or enclosure.
These essential components play a critical role in electrical installations, providing a secure and reliable termination point for flexible conduit runs. By creating a robust connection between the flexible metallic conduit and the box or enclosure, FMC connectors protect the wiring inside and ensure the integrity of the electrical system.
Purpose and Function
According to the reference, FMC connectors and couplings are used to connect flexible metallic conduit to a box or enclosure. This connection serves several key functions:
- Mechanical Protection: It physically secures the conduit, preventing it from being pulled out of the box or enclosure.
- Containment: It helps maintain the electrical enclosure's integrity, keeping wires safely contained.
- Support: Provides structural support for the conduit where it terminates.
Types and Materials
FMC connectors come in various styles to suit different installation requirements and methods. The reference mentions several types:
- Set screw
- Duplex
- Squeeze
- Clamp
- Saddle grip
These fittings are also manufactured from different materials, offering durability and suitability for various environmental conditions:
- Steel
- Malleable iron
- Zinc die cast
Common Styles Explained
| Style | Description | Typical Application |
|---|---|---|
| Set Screw | Secures conduit using set screws tightened from the side. | Standard installations, easy to install. |
| Squeeze | Compresses the conduit between internal jaws. | Provides a tight grip, suitable for vibration areas. |
| Duplex | Allows two conduits to terminate into a single entry. | Space-saving in crowded boxes. |
Applications
FMC connectors are widely used wherever flexible metallic conduit is installed, particularly in areas requiring flexibility or where rigid conduit installation is difficult or impractical. This includes:
- Connecting equipment (like motors or HVAC units) that may vibrate or move slightly.
- Making short, flexible connections in tight spaces.
- Service entrances to buildings.
Choosing the correct type and material of FMC connector is crucial for a safe and compliant electrical installation.
