PVC LB 1/2" to 4"
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PVC LB 1/2" to 4"
A PVC LB (Lateral Bend) is a type of PVC electrical conduit fitting used to create a 90-degree turn or change in direction in a conduit run. The "LB" fitting is designed specifically for use in Electrical Metallic Tubing (EMT), PVC electrical conduit, or other types of piping systems, especially when the pipe needs to go around a corner or when pulling wires through the conduit.
The LB fitting gets its name because it allows for a lateral (side) change of direction—typically used in applications where a 90-degree bend is needed, such as changing direction in walls, ceilings, or floors.
Here’s a size table for PVC LB fittings (Lateral Bend) with various nominal sizes:
PVC LB (Lateral Bend) Size Table
| Nominal Size (Trade Size) | Outer Diameter (OD) | Wall Thickness | Length (L) | Width (W) | Height (H) | Common Use |
|---|---|---|---|---|---|---|
| 1/2" | 0.840" (21.3 mm) | 0.060" (1.52 mm) | 2.60" (66.0 mm) | 2.75" (69.9 mm) | 2.00" (50.8 mm) | Used in residential and light commercial electrical installations |
| 3/4" | 1.050" (26.7 mm) | 0.060" (1.52 mm) | 3.10" (78.7 mm) | 3.25" (82.5 mm) | 2.25" (57.1 mm) | Used in light commercial and industrial electrical conduit systems |
| 1" | 1.315" (33.4 mm) | 0.060" (1.52 mm) | 3.50" (88.9 mm) | 3.75" (95.3 mm) | 2.75" (69.9 mm) | Used for power distribution and lighting circuits in larger buildings |
| 1-1/4" | 1.660" (42.2 mm) | 0.060" (1.52 mm) | 4.00" (101.6 mm) | 4.25" (107.9 mm) | 3.25" (82.5 mm) | Typically used in commercial and industrial settings for power and distribution systems |
| 1-1/2" | 1.900" (48.3 mm) | 0.060" (1.52 mm) | 4.50" (114.3 mm) | 4.75" (120.7 mm) | 3.50" (88.9 mm) | Used in medium to large electrical and irrigation applications |
| 2" | 2.375" (60.3 mm) | 0.060" (1.52 mm) | 5.00" (127 mm) | 5.25" (133.4 mm) | 4.25" (108 mm) | Used in large electrical installations, including industrial power distribution |
| 2-1/2" | 2.875" (73.0 mm) | 0.070" (1.78 mm) | 5.50" (140 mm) | 5.75" (146 mm) | 4.75" (120 mm) | Heavy-duty applications in large electrical installations |
| 3" | 3.500" (88.9 mm) | 0.070" (1.78 mm) | 6.00" (152.4 mm) | 6.25" (159 mm) | 5.25" (133 mm) | Used in large electrical distribution and industrial wiring |
| 3-1/2" | 4.000" (101.6 mm) | 0.070" (1.78 mm) | 6.50" (165 mm) | 6.75" (171 mm) | 5.50" (140 mm) | For heavy-duty electrical power distribution systems |
| 4" | 4.500" (114.3 mm) | 0.070" (1.78 mm) | 7.00" (177.8 mm) | 7.25" (184.2 mm) | 6.00" (152 mm) | Used in large-scale industrial and commercial electrical installations |
Key Dimensions Explained:
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Nominal Size (Trade Size): This refers to the nominal pipe size that the fitting is designed to work with. For example, a 1" PVC LB fitting will connect to a 1" PVC conduit.
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Outer Diameter (OD): The outer diameter of the pipe, which is critical when selecting the correct size fitting and ensuring compatibility with other components in the system.
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Wall Thickness: The thickness of the PVC material that makes up the LB fitting. The wall thickness helps determine the strength and durability of the fitting.
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Length (L): This refers to the overall length of the Lateral Bend fitting from one end to the other, which will vary depending on the size of the fitting.
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Width (W) and Height (H): These dimensions refer to the overall width and height of the fitting (often in the 90-degree bend area), which is useful for ensuring the fitting fits within a given space or for proper installation alignment.
Features of PVC LB (Lateral Bend) Fittings:
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Material: Typically made from high-quality PVC, which is resistant to corrosion, lightweight, and durable. It’s often used in electrical conduit systems for protecting wires and cables.
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Design: The LB fitting allows for a 90-degree bend in the conduit run, which is especially useful when changing direction laterally in a space.
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Type of Connection: PVC LB fittings are slip-style fittings, meaning they fit directly over the outside of the conduit and are glued into place with PVC cement. For larger sizes or specialized installations, threaded connections may also be available.
Applications:
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Electrical Wiring Systems: PVC Lateral Bend (LB) fittings are commonly used to direct electrical conduit around walls, corners, or ceilings in both residential and commercial buildings. They are used to change the path of PVC conduit without compromising the integrity or protection of the electrical cables inside.
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Irrigation Systems: Used to change the direction of PVC pipe runs for water distribution in irrigation systems, where a 90-degree lateral change is needed.
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Construction: In construction projects, especially when routing wires or cables through walls or other confined spaces, LB fittings help ensure that cables remain properly protected.
Installation:
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Measure and Cut the Conduit: Using a PVC pipe cutter or hacksaw, cut the PVC pipe to the correct length. Make sure to cut the pipe straight to ensure a proper fit into the fitting.
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Prepare the Pipe: Clean the cut ends of the conduit to remove any debris. You can use a file or deburring tool to smooth the edges.
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Prime and Cement: Apply PVC primer to the inside of the fitting and the outside of the pipe. Then apply PVC cement to both primed surfaces.
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Insert the Pipe into the Fitting: Insert the PVC conduit into the LB fitting while twisting slightly to ensure a good bond. Hold the pieces together for about 30 seconds to allow the cement to set.
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Check Alignment: Ensure that the fitting is properly aligned before the cement hardens, especially for applications where the conduit needs to follow a specific path.
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Secure and Support: After installation, use conduit straps or clamps to support the conduit at regular intervals, as specified by local building codes or NEC (National Electrical Code).
Advantages of Using PVC LB Fittings:
- Ease of Installation: PVC is lightweight and easy to handle, making installation quick and simple without the need for special tools.
- Corrosion Resistance: Unlike metal fittings, PVC does not rust, ensuring long-lasting performance in both dry and wet environments.
- Durability: PVC LB fittings are durable enough to protect electrical wiring from damage due to physical impact or exposure to chemicals.
- Cost-Effective: PVC conduit and fittings are generally more affordable than other types of conduit systems like rigid metal conduit (RMC) or intermediate metal conduit (IMC).
Conclusion:
PVC LB (Lateral Bend) fittings are an essential component in PVC electrical conduit systems, providing a 90-degree directional change in the conduit path while ensuring the protection and integrity of the electrical wiring inside. They are lightweight, durable, and easy to install, making them ideal for residential, commercial, and industrial applications. Be sure to select the appropriate size and type of PVC LB fitting for your project, and follow all necessary installation guidelines for safe and efficient wiring management.
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