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Electrical conduits are tubes used to protect and route electrical wiring in buildings and structures. They are typically made of metal or plastic, but can also be made of other materials such as fiber or fired clay. Conduits are important for protecting wiring from impact, moisture, and chemical vapors, and for preventing electrical fires. They are also used to route wiring in exposed locations, unfinished areas, and surface-mounted installations outdoors. In commercial applications, rigid metallic conduits are commonly used and offer protection against damage to wiring. Electrical metallic tubing (EMT) is a common alternative to galvanized rigid conduit due to its lower cost and weight. While commercial electricity is not necessarily moving away from conduit use, there are various types of conduits available, and the choice of conduit depends on factors such as functionality, ease of installation, fire resistance, moisture resistance, and cost.
| Characteristics | Values |
|---|---|
| Purpose | To protect and route electrical wiring in a building or structure |
| Types | Rigid and flexible conduit; electrical metallic tubing (EMT); galvanized rigid conduit (GRC); intermediate metal conduit (IMC); flexible metal conduit; PVC conduit; electrical non-metallic tubing (ENT); decorative conduit |
| Materials | Metal, plastic, fiber, or fired clay; PVC plastic; galvanized steel; aluminum; copper; stainless steel |
| Uses | Commercial, residential, and industrial buildings; outdoor and indoor use; exposed and unfinished locations; surface-mounted installations; underground wiring; protecting against fire and physical damage |
| Considerations | Functionality, ease of installation and disassembly, fire resistance, insulation, flexibility, moisture-proofing, corrosion resistance, longevity, safety, compliance with local building codes and regulations |
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What You'll Learn
- Conduit protects electrical wiring from impact, moisture, and chemical vapours
- Conduit is made from metal, plastic, fibre, or fired clay
- Electrical metallic tubing (EMT) is cheaper and lighter than galvanised rigid conduit (GRC)
- Rigid metal conduit (RMC) is used in commercial applications and protects wiring from damage
- Conduit is used to protect wiring outdoors or in exposed locations
Conduit protects electrical wiring from impact, moisture, and chemical vapours
Electrical conduits are tubes used to house and protect electrical wiring in buildings and structures. They are available in a variety of materials, including metal, plastic, fibre, and fired clay. The type of conduit used depends on the specific requirements of the installation environment.
Conduits are essential in protecting electrical wiring from impact, moisture, and chemical vapours. Firstly, conduits provide impact protection. Rigid metallic conduits, for instance, are often used in commercial applications and protect wiring from nicks, cuts, and punctures. Galvanized rigid steel (GRC) is a traditional choice for its impact resistance, but it is susceptible to corrosion and expensive to install due to its weight.
Secondly, conduits protect wiring from moisture. Moisture resistance is especially important in wet environments. PVC conduit, for example, is a lightweight and cost-effective option that resists moisture and many corrosive substances. Electrical non-metallic tubing (ENT) is another moisture-resistant option that is pliable and can be bent by hand.
Lastly, conduits protect wiring from chemical vapours. In environments with harsh chemicals, such as wastewater treatment plants, chemical resistance is crucial. Fiberglass conduit, also known as reinforced thermosetting resin conduit (RTRC), offers excellent chemical resistance and is a suitable alternative to steel in industrial applications. Champion Duct® is another example of a conduit that provides protection against corrosive chemicals.
Conduits are, therefore, essential in providing comprehensive protection for electrical wiring. They safeguard wiring from physical damage, water exposure, and chemical corrosion, ensuring the safe and efficient functioning of electrical systems.
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Conduit is made from metal, plastic, fibre, or fired clay
Electrical conduit is a tube used to protect electrical wiring in a building or structure. It is installed by electricians and is typically made from metal, plastic, fibre, or fired clay.
Metal conduit is the most common type, especially in commercial and industrial settings. Rigid metal conduit (RMC) is a thick-walled threaded tubing, usually made from coated steel, stainless steel, or aluminium. It is designed to protect wires and connectors. Galvanized rigid conduit (GRC) is another type of metal conduit with a thick wall that can be threaded. Electrical metallic tubing (EMT) is a cheaper and lighter alternative to GRC, also commonly used in commercial and industrial buildings. EMT is also made from coated steel or aluminium.
Plastic conduit, often made from PVC, is another popular option as it is lightweight, low-cost, and resistant to moisture and corrosion. It is a good choice for outdoor residential applications and can be used to protect wiring in exposed outdoor spaces.
Fibre conduit, such as reinforced thermosetting resin conduit (RTRC) or fiberglass conduit, is lighter than metallic conduits and can be less costly. It is used in a variety of indoor and outdoor applications and is available in multiple wall thicknesses.
Fired clay conduit was formerly used for underground installations, particularly for telephone and communications circuits.
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Electrical metallic tubing (EMT) is cheaper and lighter than galvanised rigid conduit (GRC)
Electrical conduit is a tube used to protect and route electrical wiring in a building or other structure. It is typically made of metal, plastic, fibre, or fired clay, and most varieties are rigid. The type of conduit used depends on the wiring's location and the protection it requires.
Two of the most common types of electrical conduit are Electrical Metallic Tubing (EMT) and galvanised rigid conduit (GRC). EMT is a thin-walled, lightweight conduit that is ideal for indoor applications. It is commonly used in commercial and industrial buildings. EMT is typically made of coated steel, although it may also be made of aluminium. It is available in trade sizes of 1/2" to 4", and 10' and 20' lengths.
GRC, on the other hand, is a type of rigid metal conduit (RMC) made from galvanised steel tubing. It is commonly used in commercial and industrial construction to protect wires and connectors. GRC has a thick wall that can be threaded.
EMT is generally more affordable than GRC due to its thinner wall construction, which reduces material costs. Its lightweight nature also simplifies transportation and handling on-site, further lowering overall expenses. The ease of handling EMT contributes to quicker installation times, and it can be cut and bent with common tools, reducing the need for specialised equipment and labour costs.
While EMT is more affordable and lightweight, GRC offers greater strength and protection against physical damage. It is suitable for exposed or hazardous areas, whereas EMT is best suited for protected indoor runs.
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Rigid metal conduit (RMC) is used in commercial applications and protects wiring from damage
Rigid metal conduit (RMC) is a type of electrical conduit that offers exceptional durability and impact resistance. RMC is a thick-walled, threaded tubing usually made of coated steel, stainless steel, or aluminum. It is designed to protect electrical wiring and connectors from physical damage, moisture, and chemicals. RMC is commonly used in commercial and industrial construction due to its robustness and ability to comply with stringent safety regulations.
RMC provides a solid and protective barrier for cables, making it suitable for environments where wiring needs maximum protection from external elements. Its thickness and rigidity offer substantial protection against physical damage, making it ideal for outdoor applications, underground installations, or areas with exposure to moisture and chemicals. RMC can also serve as an effective grounding medium, further enhancing its utility in industrial settings.
The use of RMC in commercial applications brings several benefits. Firstly, it ensures wiring safety and longevity by shielding cables from potential damage caused by physical impacts or environmental factors. This protection is crucial in commercial settings where electrical systems are extensively relied upon, and any disruptions can lead to significant losses or safety hazards. Secondly, RMC helps maintain compliance with electrical codes and standards, such as the National Electrical Code (NEC) in the United States. By adhering to these codes, commercial buildings can ensure that their electrical installations meet the required safety and performance standards.
Additionally, RMC offers versatility in terms of installation and customization. RMC comes in different types, depending on the material used in its construction. For example, Rigid Galvanized Steel (RGS) is a specific type of RMC made from galvanized steel, offering enhanced corrosion resistance. RMC can also be customized with various fittings, couplings, and connectors to suit the specific requirements of a commercial application. Furthermore, RMC's rigidity simplifies the installation process by providing a solid structure to work with, ensuring that wiring and connectors remain secure and properly supported.
While RMC is highly robust, it is important to note that it may not be the most cost-effective solution for all commercial applications. Electrical Metallic Tubing (EMT), for instance, is a lightweight and more affordable alternative that still provides sufficient protection for electrical wiring in less demanding environments. However, in commercial settings where wiring is exposed to harsh conditions or stringent safety regulations, RMC remains the preferred choice due to its superior durability and impact resistance.
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Conduit is used to protect wiring outdoors or in exposed locations
Conduit is a tube used to protect and route electrical wiring in a building or structure. It is available in rigid and flexible forms and is typically made from metal or plastic, although other materials such as fiber or fired clay are also used. Conduit is commonly used to protect wiring in exposed locations, such as along the exterior surface of a wall, and in unfinished areas like basements, crawl spaces, and attics. It is also used outdoors to protect wiring from the elements and physical damage.
There are several types of conduit that are suitable for outdoor or exposed use. Rigid metal conduit (RMC) is a thick-walled tubing usually made from coated steel, stainless steel, or aluminum. It is commonly used in commercial and industrial construction to protect wiring from nicks, cuts, and punctures. Galvanized rigid conduit (GRC) is another option, which has a thicker wall that can be threaded. Intermediate metal conduit (IMC) is a steel tubing that is heavier than electrical metallic tubing (EMT) but lighter than RMC, making it suitable for outdoor applications. EMT is commonly used in commercial and industrial buildings and is less costly and lighter than GRC.
PVC conduit is another option for outdoor or exposed wiring. It is lightweight and lower in cost compared to steel conduit materials. It is available in different sizes and wall thicknesses, with heavier grades suitable for direct burial and exposed work. PVC conduit is strong, watertight, and non-corrosive, making it a good choice for outdoor residential applications. However, it is important to note that PVC conduit is non-conductive, so an extra bonding conductor must be pulled into each conduit.
In addition to the types of conduit mentioned above, flexible metal conduit (FMT) and liquid-tight flexible metal conduit (LFMC) are also options for exposed wiring. FMT has a spiral construction that allows for easy bending and is commonly used for short runs of wiring in exposed locations, such as garbage disposals and water heaters.
Overall, the use of conduit is essential to protect wiring in outdoor or exposed locations from physical damage, corrosion, and electrical fires. It also allows for the safe routing of electrical wiring and can be used to fulfill code requirements, such as the National Electrical Code (NEC) in the United States.
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Frequently asked questions
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 other materials such as fiber or fired clay.
Electrical conduits are important because they protect electrical wiring from impact, moisture, and chemical vapors. They also prevent electrical fires and electrocution. Conduits can also be used for aesthetic reasons, providing an aesthetically acceptable passageway for wiring without hiding it behind a wall.
There are several types of electrical conduits, including rigid metal conduit (RMC), intermediate metal conduit (IMC), electrical metallic tubing (EMT), galvanized rigid conduit (GRC), flexible metal conduit (FMC/FMT), liquid-tight flexible metal conduit (LFMC), electrical non-metallic tubing (ENT), and PVC conduit.
When choosing an electrical conduit, consider the function, ease of installation and disassembly, fire resistance, insulation performance, flexibility, moisture-proofing, and acid-base resistance. Also, consider the material and its longevity. Avoid conduits wrapped with asbestos due to health risks. Check local building codes and regulations for restrictions and requirements.
