Sofia Martinez
Electrical conduits are tubes that house electrical wires for various structural applications. Conduits protect wires and individuals who may come into close contact with them. Conduits can be made from metal or plastic, and the type of conduit used is determined by the US National Electrical Code (NEC) and local building codes. This text will explore the pros and cons of EMT (Electric Metallic Tubing) conduits being metal or plastic.
| Characteristics | Values |
|---|---|
| Material | Metal (coated steel or aluminium) |
| Type | Electrical Metallic Tubing (EMT) |
| Wall thickness | Thin |
| Rigidity | Rigid |
| Protection | Less protective than rigid metal conduit |
| Weight | Lightweight |
| Ease of bending | Easy to bend |
| Cost | Economical |
| Applications | Commercial, industrial, residential |
| Exposure | Indoor and outdoor |
| Conditions | Wet and dry |
| Grounding | Does not need a ground wire run in the 20A circuit |
| Temperature resistance | High |
| Installation locations | Walls, floors, concrete, buried in earth |
| Installation requirements | Conduit bender, hacksaw or abrasive chop saw, reamer |
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What You'll Learn
EMT conduit is made from coated steel or aluminium
EMT conduit, or electrical metallic tubing, is a type of thinly-walled conduit pipe made from coated steel or aluminium. It is a popular choice due to its affordability and flexibility, and is used to protect electrical wiring in a variety of settings. EMT conduit is available in a range of sizes and lengths, making it suitable for both industrial and commercial buildings, as well as some residential renovation or construction projects.
EMT conduit is known for its lightweight properties, making it easier to work with than some other types of conduit. It can also be bent to shape using a special tool, allowing it to fit around obstructions or follow the shape of the installation. This versatility makes it a common choice for cable installations.
The steel used in EMT conduit is typically galvanized low carbon steel or galvannealed steel, which provides resistance to rust and corrosion. Aluminium EMT conduit, on the other hand, has a higher resistance to corrosion than other metals and materials. It is often used in outdoor applications, although it requires sealed dielectric end fittings and terminations to prevent rapid corrosion when in contact with steel and moisture.
EMT conduit is often compared to rigid metal conduit (RMC), which is made of thicker-walled metal and offers superior protection against mechanical impact. RMC is constructed of either aluminium or galvanized steel and is one of the most heavy-duty types of conduit used in industrial applications. While EMT conduit is more lightweight and flexible, RMC provides greater strength and protection.
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EMT is lightweight, flexible and easy to bend
Electrical Metallic Tubing (EMT) is a lightweight, flexible conduit that is easy to bend. EMT is a popular type of electrical conduit used in cable installations. It is a thin-walled conduit with walls that are significantly thinner than those of rigid metal conduits (RMC). EMT is made from coated steel or aluminium and is a more economical and thinner-walled option than rigid metal conduits.
EMT's lightweight and flexible nature makes it easy to work with and reduces labour time and material waste during installation. It can be bent using manual or electric benders, and its flexibility allows it to be bent easily without damaging the conduit. EMT is also available in aluminium and steel options, which makes it recyclable and environmentally friendly.
While EMT is lightweight and flexible, it still requires tools and expertise to bend accurately. Its rigidity can limit its use in confined or irregular spaces. Additionally, EMT's metal composition requires consistent bonding and grounding across the system, and improper bonding can result in electrical hazards or non-compliance with code requirements.
Compared to other types of conduits, such as PVC, EMT offers several advantages. EMT is more efficient to bend than PVC, which requires heating before bending to prevent cracks. EMT is also less likely to break or shatter than PVC, which can become brittle over time. EMT is also aesthetically more attractive than PVC, making it excellent for exposed environments where appearance matters.
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EMT is more expensive than PVC
Electrical Metallic Tubing (EMT) is more expensive than Polyvinyl Chloride (PVC) conduit. EMT is a type of rigid metal tubing made from coated steel or aluminium, whereas PVC is a plastic conduit.
EMT is more expensive because it is a superior product in certain situations. EMT is more durable than PVC, offering greater mechanical protection and strength. It is also more resistant to corrosion, which is a particular concern in damp or underground locations. EMT is therefore a better option for exposed areas that are susceptible to impact. EMT can also be bent to shape using a special tool, which is useful for fitting around obstructions or following the shape of the installation.
PVC, on the other hand, is a more cost-effective and simpler option to work with, which helps to reduce labour time and installation costs. It is lightweight, flexible, and easy to install. However, it is not suitable for exposed locations and is therefore typically used for walls, floors, and ceilings.
Despite PVC being the more affordable option, some people still prefer to use EMT for certain projects. For example, in commercial or industrial settings, EMT is preferred because it is more durable and fire-resistant. EMT is also a better option in areas with extreme temperature variations, as PVC is heat-sensitive and grows and contracts a lot. EMT is also more resistant to UV exposure, whereas PVC breaks down over time with sunlight exposure.
In summary, EMT is more expensive than PVC because it is a superior product in terms of strength, protection, durability, and resistance to corrosion and UV exposure. However, PVC is a more affordable and flexible option that is easier to work with and install. The choice between the two depends on the specific demands of the project, environmental factors, and budget constraints.
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EMT is suitable for exposed and concealed applications
Electrical Metallic Tubing (EMT) is a versatile material that can be used for both exposed and concealed applications. Its adaptability to different environments and installation requirements makes it a popular choice for various projects. EMT is constructed from coated steel or aluminium, giving it a sleek and modern aesthetic that blends well with contemporary architectural designs.
EMT is suitable for exposed applications where it may be visible, such as in open ceilings or visible conduit runs. Its smooth, clean surface contributes to its visual appeal, making it an attractive choice for settings where the visual impact of electrical conduits is a consideration. The lightweight nature of EMT also makes it easier to install and bend to shape, accommodating a variety of electrical applications.
EMT is also suitable for concealed applications, where it can be hidden behind walls or installed within concrete or direct burial applications. It is important to note that when using EMT in direct contact with the earth or in corrosive environments, appropriate fittings must be used and corrosion protection standards must be met. EMT is not suitable for areas with severe physical damage or where it could be exposed to moisture.
EMT provides a reliable solution for protecting and routing electrical wiring in residential, commercial, and industrial settings. Its solid construction protects electrical wiring from impacts, crushing, and other potential hazards. While EMT is less durable than Rigid Metal Conduit (RMC) in highly corrosive environments, it offers a more economical and thinner-walled option that is still suitable for a wide range of applications.
Overall, EMT is a versatile and adaptable conduit option that is suitable for both exposed and concealed installations, making it a popular choice for a diverse range of projects.
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EMT is rated for both indoor and outdoor use
Electrical Metallic Tubing (EMT) is a type of conduit that is made from coated steel or aluminium. It is a more economical and thinner-walled option than other types of conduits. EMT is used to protect electrical wires and cables and is suitable for both indoor and outdoor use.
EMT can be installed in exposed locations, as well as behind walls or in concrete. When used outdoors, it is important to consider the local climate and the potential for corrosion or rusting. In areas with high humidity or salt exposure, EMT may be more susceptible to corrosion and rusting, which can impact its durability and appearance over time.
To mitigate these issues, EMT can be galvanised, painted, or coated with tar before installation. Additionally, raintight fittings are often used with EMT in outdoor applications to protect against water ingress. However, some sources suggest that these fittings may not provide a long-term solution to water ingress.
EMT is also commonly used indoors, where it can be bent to shape using a special tool to fit around obstructions or follow the installation path. It is important to note that, regardless of the application, the use of EMT must comply with local building and electrical codes, such as the National Electrical Code (NEC) in the United States.
Overall, EMT is a versatile and economical conduit option that can be used in a variety of indoor and outdoor applications, provided that the appropriate considerations are made to ensure its durability and compliance with local regulations.
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Frequently asked questions
EMT stands for electrical metallic tubing and is a type of conduit used in cable installations. It is made from coated steel or aluminium and is a more economical and thinner-walled option than rigid metal conduit.
EMT conduit is lightweight, flexible, and easy to bend. It is also versatile, suitable for both indoor and outdoor use and in both wet and dry conditions. EMT conduit is also more resistant to rust and corrosion than other types of conduit.
This depends on the application. EMT conduit is generally considered to look more professional and industrial, and it can be used in exposed locations, unlike PVC conduit. However, PVC conduit is more water-resistant and performs better underground.
