Umair Gaines
Electrical conduits are essential for wiring and are used to protect and route electrical cables in a building or structure. They are typically made of metal or plastic and can be rigid or flexible. There are several types of electrical conduits, including rigid metal conduit (RMC), intermediate metal conduit (IMC), electrical metallic tubing (EMT), electrical non-metallic tubing (ENT), liquid-tight flexible metal conduit (LFMC), and rigid polyvinyl chloride (PVC) conduit. The type of conduit used depends on the specific wiring needs and installation environment. For example, RMC is known for its strength and protection against impacts, while ENT is flexible, moisture-resistant, and flame-retardant. Conduit installations must follow the National Electrical Code (NEC) guidelines and all applicable local code regulations.
| Characteristics | Values |
|---|---|
| Definition | A tube used to protect and route electrical wiring in a building or structure |
| Types | Rigid, Intermediate, Flexible |
| Materials | Metal, Plastic, Fiber, Fired Clay |
| Installation | Installed by electricians at the site of installation of electrical equipment |
| Regulations | US National Electrical Code (NEC), Local Code Regulations |
| Protection | Impact, Moisture, Chemical Vapours, Fire, Electromagnetic Interference |
| Uses | Exposed Locations, Unfinished Areas, Outdoor Installations |
| Cost | Varies with type and installation, ranging from $500 to $30,000 |
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What You'll Learn
- Electrical conduits are essential for wiring and protecting electrical cables from damage
- Conduits can be rigid or flexible and are made from metal or plastic
- RMC is a heavy-duty, rigid metal conduit made from galvanised steel
- ENT is a flexible, corrugated plastic tubing that is moisture-resistant and flame-retardant
- LFMC is a special type of flexible metal conduit with a plastic coating, used for outdoor equipment
Electrical conduits are essential for wiring and protecting electrical cables from damage
The primary function of electrical conduits is to protect electrical cables and wiring from damage. They are designed to withstand hazardous environmental conditions and safeguard wires from moisture, impact, chemical vapours, and other dangers. This protection ensures the reliability and security of electrical systems, preventing short circuits, electrical fires, and potential dangers to service personnel.
Different types of electrical conduits cater to specific applications, environmental conditions, and regulatory requirements. Rigid metal conduits (RMCs) have thick walls and strong construction, making them ideal for protecting against impacts and severe damage. RMCs are commonly used in industrial and commercial buildings. Intermediate metal conduits (IMCs) offer similar protection to RMCs but are more economical, often used in underground and wet locations. Electrical metallic tubing (EMT) is a lightweight, thin, strong, and bendable option commonly used for indoor wiring.
Flexible conduits, such as flexible metallic conduits (FMCs) and liquid-tight flexible metal conduits (LFMCs), are used in applications where vibration isolation is necessary or where rigid connections are impractical. They provide adaptability in routing cables and are suitable for specific environments, such as dry areas for FMCs and wet areas for LFMCs.
In addition to protection, electrical conduits play a crucial role in meeting building safety standards and electrical codes. They ensure compliance with regulations, providing a standardised and safe electrical installation. Conduits also offer design versatility, allowing for flexible cable configurations and installations, especially in tight spaces or complex wiring setups.
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Conduits can be rigid or flexible and are made from metal or plastic
Electrical conduits are essential for wiring jobs and are used to protect and route electrical wiring in a building or structure. They are available in rigid or flexible forms and are made from either metal or plastic.
Rigid metal conduits (RMC) are typically composed of heavyweight galvanized steel and installed with threaded fittings. RMCs have thick walls to protect the cables from electromagnetic interference that can harm sensitive equipment. RMC is also one of the more expensive electrical conduits in terms of both materials and labour.
Flexible metal conduits (FMC) are made by coiling self-interlocked steel or aluminium strips to form a hollow tube for electrical cables. FMC is used in dry areas where it would be impractical to install RMC or other non-flexible conduit, yet metallic strength is still required.
Electrical non-metallic tubing (ENT) is flexible, corrugated plastic tubing that is moisture-resistant and flame-retardant. ENT is easy to bend and is often used inside walls or concrete block structures.
Liquid-tight flexible metal conduit (LFMC) is a special type of flexible metal conduit with sealed fittings and a plastic coating to make it watertight and corrosion-resistant. LFMC is commonly used with outdoor equipment, such as air conditioner units.
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RMC is a heavy-duty, rigid metal conduit made from galvanised steel
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. It is usually made of metal or plastic, but can also be made of fibre or fired clay. Most electrical conduits are rigid, but flexible conduits are used for some purposes.
Rigid Metal Conduit (RMC) is a heavy-duty conduit made from galvanised steel. RMC is used for the structural piping that houses the wiring for a home's connection to utility service lines. RMC is available in trade sizes of 1/2 through 6 and lengths of 10' and 20'. RMC is also available in 8 vivid colours to help differentiate important circuits in a tough environment. RMC is often used in outdoor applications, energy and manufacturing plants, and corrosive environments. RMC is also used in short-run installations as a grounding conductor.
RMC is manufactured with the thickest walls of any steel raceways to protect the cables inside from electromagnetic interference that can harm sensitive equipment. RMC is also coated in zinc, chromate conversion, and organic polymer to protect it from corrosion. RMC is joined with threaded connections and screwed connectors connect the conduit to the main tubes.
RMC is a good choice for protecting against impacts and severe damage due to its strong construction. RMC is also easy to cut, bend, and thread on the job.
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ENT is a flexible, corrugated plastic tubing that is moisture-resistant and flame-retardant
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. Electrical conduits are essential for wiring jobs and are selected based on wiring needs. They are available in both rigid and flexible forms and protect the wires in exposed locations such as exterior wall surfaces, as well as in unfinished areas like basements, crawl spaces, and attics.
One type of electrical conduit is Electrical Non-Metallic Tubing (ENT), which is a flexible, corrugated plastic tubing. ENT is designed for use inside residential walls or concrete block structures. While ENT is moisture-resistant and flame-retardant, it is not suitable for exposed locations and should not be installed outdoors. This is because, despite its high mechanical strength, it has slightly poor flexibility. ENT is also known as 'Smurf tubing' due to its blue colour, although it is also available in grey and orange, depending on the manufacturer.
Other types of electrical conduits include Rigid Metal Conduit (RMC), which is a thick-walled threaded tubing typically made of stainless steel, coated steel, or aluminium, and Flexible Metallic Conduit (FMC), which is made by coiling self-interlocked ribbed strips of aluminium or steel to form a hollow tube. RMC is an excellent choice for protecting against impacts and severe damage due to its strong construction. FMC, on the other hand, is used to connect to motors or other devices where isolation from vibration is useful, or where an excessive number of fittings would be needed for rigid connections.
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LFMC is a special type of flexible metal conduit with a plastic coating, used for outdoor equipment
An electrical conduit is a tube used to protect and route electrical wiring in a building or structure. They are typically made of metal or plastic, but can also be made of fibre or fired clay. Most conduits are rigid, but flexible conduits are used for some purposes.
Liquid-tight flexible metal conduit (LFMC) is a special type of flexible metal conduit with a plastic coating. This makes it watertight and corrosion-resistant. LFMC is suitable for various installation conditions, including hazardous locations and direct burial. It is commonly used for outdoor equipment such as air conditioner units.
The flexibility of LFMC means it can be used to connect to motors or other devices where isolation from vibration is useful. It can also be used where it would be impractical to install EMT or other non-flexible conduit, yet where metallic strength is still required to protect conductors.
LFMC is made by coiling self-interlocked steel or aluminium strips to form a hollow tube for electrical cables. This type of conduit is available in a range of sizes, with varying numbers and types of conductors able to be pulled into it.
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