Rigid Conduit Body Types Explained: LB, LL, LR, T & C

When it comes to electrical installations, choosing the correct rigid conduit body is crucial for safety, code compliance, and ease of maintenance. Conduit bodies provide a secure housing that allows electricians to pull, splice, and maintain wires within a conduit system. In this guide, we’ll break down the most common types—LB, LL, LR, T, and C—and explain how they are used in real-world applications.

What is a Rigid Conduit Body?

A conduit body is a metal or PVC enclosure with threaded or non-threaded openings designed to connect sections of conduit. It acts as an access point for pulling wires, changing directions, and performing maintenance. Conduit bodies are defined and governed by the National Electrical Code (NEC) Article 314 and must be UL-listed for compliance.

LB Conduit Body

The LB (Line Box) conduit body is one of the most commonly used types. It has an opening on one end and another opening at a 90-degree angle, with a removable cover on the back. This makes it ideal for pulling wires around exterior walls.

• Use Case: Outdoor wall conduits, service entrances.
• NEC Compliance: Meets NEC 314.16 for wire fill volume.
• Example: LB Conduit Body – UL Threaded

LL Conduit Body

The LL conduit body features entries on the left side and the back. It allows for directional changes where the conduit must bend left at a 90-degree angle.

• Use Case: Left-hand wall or corner installations.
• Material Options: Aluminum, die-cast, or PVC coated.
• Example: Shop LL Conduit Bodies

LR Conduit Body

The LR conduit body mirrors the LL type, but with the opening on the right-hand side. It is used in tight spaces where conduit must turn right.

• Use Case: Right-hand directional changes.
• NEC Note: Ensure volume capacity is sufficient for conductor count.

T Conduit Body

The T conduit body provides three openings in a “T” configuration. This makes it possible to branch a conduit run in two different directions.

• Use Case: Creating branch circuits in industrial and commercial wiring.
• Compliance: NEC 314 requires fill capacity labeling for multi-conductor systems.

C Conduit Body

The C conduit body has two entries on opposite ends, making it useful for straight-through conduit runs where splicing or pulling wires is needed.

• Use Case: Straight conduit runs requiring wire access.
• Advantage: Easier pulling of long wire runs without damaging insulation.

NEC Compliance & Wire Fill

All conduit bodies must comply with NEC Article 314, which regulates:

• Maximum conductor fill based on cubic inch capacity
• Markings of volume capacity inside the body
• Accessibility for future maintenance and inspections

Choosing the Right Conduit Body

Selecting the right conduit body depends on your project requirements. Factors to consider include:

• Direction of conduit runs (LB, LL, LR for turns; T for branches; C for straight runs)
• Indoor vs. outdoor installation (consider weatherproof aluminum vs. PVC)
• Wire size and conductor count (check cubic inch fill ratings)

Conclusion

Rigid conduit bodies are a small but critical part of safe and code-compliant electrical installations. By understanding the differences between LB, LL, LR, T, and C types, you can choose the right fitting for your job and ensure compliance with the NEC.

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