Molly Ayala
LB, LL, and LR are common electrical abbreviations that indicate the specific location of electrical conduits or fittings within a building. LB stands for L-type conduit body, and it allows for a 90-degree change in direction. The first letter L means el, indicating a 90-degree turn, while the second letter refers to the direction the conduit exit point: Back, Left, or Right.
| Characteristics | Values |
|---|---|
| Abbreviation | LB |
| Full Form | L-type conduit body |
| Direction of Conduit Exit Point | Back |
| Shape | Oblong |
| Cover | Present on the long side |
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What You'll Learn
L-type conduit body
Conduit bodies are available in different shapes and sizes, and the type you need depends on your specific use case. The first letter of the conduit body type indicates its shape, with "L" indicating an L-shape, "T" indicating a T-shape, and "X" indicating an X-shape. The second letter describes the direction the wire exits relative to its entry point.
An L-type conduit body, or LB conduit body, is a type of conduit body that forms a right angle and includes two conduit hubs. The access point on an LB conduit body is on the back of the body, on the opposite side of the cover. This type of conduit body is often used by electricians to route electrical wires through surfaces, such as from the outside of a structure through the wall and to the inside.
The LL conduit body is another variation of the L-type conduit body. It also forms an L-shape and diverts the raceway at a 90-degree angle, but it has an exit point on the left side of the body. Electricians feed wires from an access point on top of the body and out to the left.
The LR conduit body is a variation of the L-type conduit body with two conduit hubs. It forms an L-shape, allowing electricians to adjust the raceway's orientation by 90 degrees. Electricians can feed wires through a conduit hub at the top and then direct them out through a second conduit hub on the right, allowing for redirection along the same plane.
In addition to the L-type conduit bodies, there are also Type C conduit bodies, which connect two conduits in a straight line. While they do not alter the direction that the wires travel, they feature removable plates to create serviceable points along the raceway.
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90-degree change in direction
LB, LL, and LR are common abbreviations used to indicate the specific location of electrical conduits or fittings within a building. These terms help electricians and contractors communicate effectively about the installation and placement of electrical components.
The letter "L" stands for "el", indicating a 90-degree turn, while the second letter refers to the direction of the conduit exit point: "B" for back, "L" for left, and "R" for right. To visualize this, imagine holding the fitting vertically with the cover facing you and the conduit entry on the long dimension at the top. If the second conduit entry (the short dimension) exits at the back, it is an "LB"; if it exits on the left, it is an "LL"; and if it exits on the right, it is an "LR". These fittings have an oblong shape with a cover on the long side, allowing access for pulling the wire and facilitating the 90-degree change in direction.
For example, in the context of replacing an old electrical panel, one might encounter a situation where there is limited space to mount a new box. In such cases, an LB fitting could be used to navigate a 90-degree change in direction, directing the conduit to the back or bottom of the box.
It is important to note that variations of these fittings exist, such as the LBL, which functions similarly to an LB but also allows for an exit at the back. Additionally, there are fittings like the LBY, which provides extra wiggle room and resembles a pull elbow or a GUA-type fitting rather than a typical condulet fitting.
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Conduit exit point
Conduit bodies are available in different shapes and sizes, and they are used to house electrical wiring. They are typically made of metal or plastic and can be rigid or flexible. The type of conduit body used depends on its shape and the location of its removable plate.
The L-type conduit body is one such variation, with three types: LB, LL, and LR. These abbreviations indicate the specific location of electrical conduits or fittings within a building. The first letter "L" means "el", referring to a 90-degree turn. The second letter refers to the direction of the conduit exit point: "B"ack, "L"eft, or "R"ight.
For example, the LR conduit body has two conduit hubs. It forms an L shape, allowing electricians to adjust the raceway's orientation by 90 degrees. The electrician can feed wires from a conduit hub at the top and direct them out through a second conduit hub on the right.
The LB conduit body is another type that forms a right angle and includes two conduit hubs. The access point is on the back of the body, opposite the cover.
Determining the exit point of a conduit can be challenging, especially if it is embedded in concrete. Some methods to trace the path of an empty conduit include using a snake wire, a neodymium magnet with a compass or magnetic viewing paper, or a toner tracer.
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Electrical conduits
Conduits can be metallic or non-metallic, with the option of rigid or flexible types. Rigid metal conduits (RMC) are typically made of heavyweight galvanised steel and are known for their strength and durability. However, they are also more expensive in terms of materials and labour. Galvanised rigid steel (GRC) is another option, offering impact resistance, UV stability, and protection from electromagnetic interference. Despite these advantages, GRC is prone to corrosion and has poor field handling, making it costly to install. Intermediate metal conduits (IMC) are similar to RMC but slightly lighter, making them more cost-effective and suitable for outdoor use. Electrical metallic tubing (EMT) is a thin-walled, unthreaded option, commonly used in residential, commercial, and industrial applications.
Non-metallic conduits, such as liquid-tight flexible non-metallic conduits (LNFC), are also available and provide protection for electrical circuits rated for a maximum of 600 volts. PVC conduit is a popular choice for outdoor use due to its durability and resistance to ultraviolet rays. It is lightweight, flexible, and resists corrosion, making it suitable for direct burial or above-ground work.
Conduit fittings, such as connectors, couplings, and elbows, are essential accessories that enable the attachment of conduit lengths to each other and to other parts of an electrical project. For example, a connector can be used to attach a conduit to an electrical box. When installing conduit pipes and working with electricity, it is crucial to wear safety equipment, including gloves, safety glasses, and work shoes.
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Fittings within a building
Electrical fittings are components used to connect, secure, and protect electrical wiring in various installations. They include a range of items designed to work together to create safe and efficient electrical connections. These fittings are crucial in managing the flow of electricity, preventing short circuits and electrical hazards, and enabling the organisation of wiring within walls, ceilings, and other structures.
There are two main types of materials used for electrical fittings: metallic and non-metallic. Metallic fittings are commonly made from coated steel, stainless steel, or aluminium, while non-metallic options include PVC or plastic. PVC fittings offer benefits such as insulation, lightweight design, long-lasting durability, and low production costs.
When it comes to electrical conduits or fittings, specific abbreviations like LB, LL, and LR are used to indicate their location within a building. LB refers to an "L-type conduit body", LL stands for an "L-type conduit body without a cover", and LR represents an "L-type conduit body with a removable cover". These terms help electricians communicate effectively about the installation and placement of electrical components.
It is important to select the appropriate fittings for electrical installations to ensure safety and functionality. Fittings can include items like butt connectors, ring terminals, or spade terminals, each designed for different electrical circuits. Additionally, insulating bushings protect wires from damage by conduit ends, while conduit hangers secure pipes to walls or ceilings, maintaining structural integrity.
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