Umair Gaines
Electrical conduits are protective tubes that house electrical wires for various structural applications. They are essential for protecting electrical wiring from moisture, fire, corrosion, impact, electrocution, and short circuits. When selecting an electrical conduit, it is crucial to consider the specific project requirements and environment. Various types of conduits are available, such as rigid metal conduits (RMC), electrical metallic tubing (EMT), flexible metal conduits (FMC), PVC conduits, fiberglass conduits, and high-density polyethylene (HDPE) conduits. PVC conduits, for instance, are lightweight, inexpensive, non-conductive, and durable. They offer protection against corrosion, moisture, and various weather conditions. The minimum size for PVC conduit is typically 1-1/4 inches, with standard sizes ranging from 16mm to 200mm. Fiberglass conduits are also widely used due to their lightweight, cost-effective, and resistant nature. They provide excellent protection for electrical wiring and are immune to corrosion and degradation from moisture, chemicals, and UV light.
| Characteristics | Values |
|---|---|
| Purpose | To provide protection to electrical wiring and electrical cables from moisture, fire, corrosion, impact, electrocution, and short circuits |
| Materials | Metal, plastic, fiber, or fired clay |
| Types | Rigid metal conduit (RMC), electrical metallic tubing (EMT), flexible metal conduit (FMC), PVC, fiberglass, high-density polyethylene (HDPE) |
| PVC Sizes | 16mm to 200mm |
| Fiberglass Sizes | Trade size 1/2 through trade size 6 |
| Burial Depth | According to NEC; S80 is required if the conduit is higher than the burial depth or emerges from the ground |
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What You'll Learn
- PVC conduits: lightweight, inexpensive, and protective against electric shock
- Rigid metal conduits: thick, heavy, and expensive, but offer excellent protection
- Electrical metallic tubing: lightweight and bendable, but better for indoor use
- Flexible metal conduit: bendable and useful for tight bends, made with helical coiling
- Burial depth: 12 inches in the backyard, 3-4 feet in driveways, and 8 feet in public
PVC conduits: lightweight, inexpensive, and protective against electric shock
Underground electrical conduit systems must meet specific requirements, such as the National Electrical Code (NEC) standards, to ensure safety and functionality. The type of conduit selected depends on various factors, including the location, environment, durability, cost, and ease of installation.
PVC (Polyvinyl Chloride) conduits are a popular choice for underground electrical applications due to their lightweight, inexpensive, and protective characteristics. Firstly, PVC conduits are lightweight, making them easy to handle and install, especially when compared to traditional heavy metal conduits. This lightweight property contributes to reduced labour costs.
Secondly, PVC conduits are highly cost-effective. They are generally among the least expensive options available, making them a budget-friendly choice for underground electrical projects. This affordability is a significant advantage, especially when compared to more costly options like metallic conduits.
Lastly, PVC conduits offer excellent protection against electric shock. Their non-conductive property ensures that electricity is safely contained within the conduit, reducing the risk of electric shock to humans and animals. This protective feature is essential in maintaining a safe environment for individuals and wildlife in the vicinity of underground electrical installations.
While PVC conduits offer these advantages, they may not be suitable for areas with extreme temperatures or heavy impacts. Additionally, they may not provide an adequate temperature range or sufficient strength to withstand soil compaction. Therefore, it is crucial to consider the specific project requirements and environmental conditions when selecting the appropriate conduit type.
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Rigid metal conduits: thick, heavy, and expensive, but offer excellent protection
Rigid metal conduits (RMC) are thick, heavy, and expensive, but they offer excellent protection for electrical wiring. RMCs are made from heavyweight galvanized steel, stainless steel, or aluminium and are installed with threaded fittings. They provide strong protection in harsh environments, but their weight and thickness make them challenging to install. RMCs are also more costly in terms of both materials and labour.
RMCs are ideal for protecting electrical wiring from moisture, fire, corrosion, impact, electrocution, and short circuits. They are well-suited for environments where these factors are a concern. RMCs are also suitable for projects that require strong protection from physical damage. For example, RMCs are a good choice for protecting electrical wiring in public spaces where there is a lot of foot traffic and a risk of vandalism.
The size of the RMC will depend on the specific project requirements and the environment in which it will be installed. RMCs typically range in size from 1/2" to 6" trade sizes. It's important to note that RMCs have threaded connections, which can make it more difficult to install wiring. As such, it is recommended to consider other types of conduits if they are better suited to the specific project.
When choosing an electrical conduit, it is important to consider the location and environment of the project. Different types of conduits offer varying levels of protection and have different properties. For example, PVC conduits are lightweight and inexpensive, while fiberglass conduits are lightweight, cost-effective, and resistant to temperature and moisture.
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Electrical metallic tubing: lightweight and bendable, but better for indoor use
Electrical Metallic Tubing (EMT) is a lightweight and flexible option for conduit tube installations. It is a thin-walled, unthreaded raceway designed to protect and route electrical conductors. EMT is a good choice for indoor use due to its flexibility and ease of installation.
EMT is available in various sizes, commonly ranging from 1/2 inch to 3/4 inch in diameter and 10 feet in length. It is important to note that EMT is not suitable for severe physical damage and requires corrosion-resistant materials, making it vulnerable to underground conditions.
While EMT offers advantages in terms of weight and flexibility, it may not be the best choice for underground electrical applications due to its susceptibility to damage and corrosion. For underground installations, it is crucial to select a conduit that can withstand moisture, corrosion, and physical impacts to prevent short circuits and equipment failure.
Instead, traditional rigid metal conduits (RMC) made of galvanized steel, stainless steel, or aluminum have been commonly used for underground electrical conduit construction projects. However, RMCs are heavy and contribute to higher material and labor costs. As a result, there has been a shift towards using lighter and more cost-effective options, such as reinforced thermosetting resin conduit (RTRC) or fiberglass conduit.
When selecting an electrical conduit, it is essential to consider the specific location and environment of the project to ensure safety and compliance with electrical codes like the National Electrical Code (NEC).
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Flexible metal conduit: bendable and useful for tight bends, made with helical coiling
Underground electrical conduit provides valuable protection to electrical wiring and cables from moisture, fire, corrosion, impact, electrocution, and short circuits. It is important to select the right conduit for the job, as choosing the wrong one can lead to safety risks and financial implications.
Flexible metal conduits (FMC) are produced using helical coiling to create strips of interlocked aluminium and steel. This makes them very bendable, which is great for applications where tight bends are required. FMC is lightweight and easy to work with, but it is best suited for indoor use instead of underground use because it can easily be damaged.
FMC is a good choice for projects where there is a low risk of physical damage, and its flexibility makes it ideal for tight spaces and bends. It is also suitable for use in a variety of environments, providing protection from moisture, impact, chemical vapors, and animals.
When selecting an electrical conduit, it is important to consider the specific location and environment of the project. For example, underground installations require sufficient protection against moisture and corrosion to prevent short circuits and equipment failure. Weight, ease of handling, and the ability to safely cut the conduit in the field are also factors that can contribute to potential installation injuries.
In addition to FMC, other types of conduits used for underground electrical applications include PVC, HDPE, fiberglass, and traditional rigid metal conduits. PVC conduits are the lightest and least expensive option, while HDPE and fiberglass are strong, flexible, and cost-effective. Rigid metal conduits provide excellent protection in harsh environments but are heavy and expensive.
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Burial depth: 12 inches in the backyard, 3-4 feet in driveways, and 8 feet in public
Underground electrical conduit is a tube that houses electrical wires and protects them from moisture, fire, corrosion, impact, and short circuits. The size and depth of burial for underground electrical conduits depend on various factors, including the specific project requirements, local regulations, and environmental conditions.
For burial depths, the National Electrical Code (NEC) provides guidelines to ensure the protection of the conduit from damage:
- Backyard (12 inches): A burial depth of 12 inches is sufficient for conduits in a backyard, where it is only subject to potential damage from a lawn mower.
- Driveways (3-4 feet): In areas where the conduit could be bumped by a car, such as driveways or public parking garages, a deeper burial of 3 to 4 feet is recommended.
- Public areas (8 feet): In public areas with high foot traffic and potential vandalism, any portion of the conduit within 8 feet of the ground should be protected.
It's important to note that local regulations and building codes may have specific requirements for burial depths, and these should be consulted before installing underground electrical conduits.
The size of the conduit tube also depends on various factors, including the number and type of conductors, local regulations, and environmental conditions. Common materials for underground electrical conduits include PVC, fiberglass, and metal. PVC conduits are lightweight, durable, corrosion-resistant, and cost-effective, making them a popular choice for underground installations. Standard PVC conduit sizes typically range from 16mm to 200mm, depending on the application and authority requirements. Flexible corrugated PVC conduits can also be used and typically come in sizes up to 63mm or 80mm.
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Frequently asked questions
Electrical conduits are tubes that house electrical wires for structural applications. They are used to provide protection for electrical wiring from moisture, impact, chemical vapors, and animals.
Electrical conduits can be made from metal, plastic, fiber, or fired clay. PVC conduits are the lightest and least expensive option. They are also durable, corrosive-resistant, and can protect electrical wiring from moisture. Other types include rigid metal conduits (RMC), electrical metallic tubing (EMT), and flexible metal conduits (FMC).
The size of the electrical conduit depends on the specific project requirements and local regulations. Standard PVC conduit sizes range from 16mm to 200mm. For PVC conduits used in underground installations, the minimum size is typically 1-1/4". Fiberglass conduits, which are also commonly used for underground applications, range in size from trade size 1/2 to trade size 6.
