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Electrical conduit is essential for protecting and routing electrical wiring systems. Available in various sizes and materials, one popular type is the 20mm black conduit. The number indicates its diameter in millimeters, approximately three-quarters of an inch.
As such, it’s a medium-sized conduit widely applicable in residential and commercial constructions. Below are some common types of this conduit.
PVC conduit
PVC or polyethylene plastic electrical conduit is a non-metallic type popular for its waterproof and corrosion-resistant properties. Therefore, it is an ideal 20mm black conduit for both underground and outdoor applications due to its durability and lightweight nature.
Flexible conduit
Also known as Greenfield or armoured flexible conduit, the flexible conduit is made from metal or plastic-coated wire. This conduit is pliable; therefore, it is ideal for applications with a need for bending or movement. The flexible conduit можно использовать как 20 мм черный трубы на станциях и машинах, где требуется защита проводки от механических повреждений и в то же время гнучкість для костюма. Некоторые типы гибкое ведение также могут быть водо- и коррозия.
Монтаж гибкого conduita часто включает в себя использование соответствующих крепежных деталей, таких как гайки, шайбы и болты.
Galvanized steel conduit
Galvanized steel conduit or GRC is a steel conduit coated with a thick layer of zinc to prevent corrosion. Thus, a 20mm black galvanized steel conduit is ideal for highly corrosive environments such as factories, marine, and chemical plants. In addition, its rigidity provides superior protection against impact.
Rigid metal conduit (RMC)
Similar to galvanized steel conduit, a rigid metal conduit is constructed from thick, durable metal to provide maximum protection from mechanical damage. This rigid metal conduit is ideal for applications requiring long-term cable protection and grounding because it has good electrical conductivity. An 20 mm black iron conduit is appropriate for almost any environment, including outdoor and underground applications.
EMT (Electrical Metallic Tubing) conduit
Also known as thin-wall conduit, EMT conduit is made from light-gauge metal or steel. While it offers less protection than other rigid conduits, it is easy to install due to its lightweight. EMT is most suitable for indoor applications, especially in cases where exposure to moisture is not highly likely. A 20mm black emt conduit can protect wiring in dry, low-impact areas. While not as durable, it's often used for cost-effective installations.
The 20mm black electrical conduit is manufactured with some specific materials and standards. Thus, knowing its specifications facilitates better maintenance and durability. Here's a breakdown of common specifications alongside the maintenance procedure.
Conduit material
A 20mm black conduit can be constructed from various materials, including galvanized steel, PVC, aluminum, and EMT steel. Therefore, the choice of material affects properties such as flexibility, corrosion resistance, and grounding capability.
Wall thickness
Generally, the thickness of a conduit wall varies based on size and material. As such, thicker walls ensure more protection and rigidity. However, in this case, a 20mm conduit has an average wall thickness of 1.2 to 2.0 mm.
Length
Most electrical conduits are manufactured and sold in standard lengths of 3 or 4 meters. A flexible conduit can be shortened to any desired length, as it takes on a new shape upon bending. On the other hand, a rigid conduit cannot be shortened. Hence, lengthy maintenance is required on rigid conduit displaying signs of rusting or corrosion due to the lead effect of discontinuity that may result in possibly fatal electrical accidents.
Compliance with standards
A 20mm black conduit is constructed according to national and local regulations and electrical codes, which include ANSI, NEMA, or UL. These standards ensure safety, compatibility, and mechanical strength. Measurement and maintenance protocols are required to comply with the standard stipulations.
The 20mm black conduit is a versatile electrical conduit widely applicable in various environments and installation needs due to its strong construction and versatile properties. Below is a breakdown of some common scenarios where this electrical conduit is most useful.
Commercial construction
Dissipated 20mm black conduits are commonly used in commercial buildings, warehouses, and retail spaces. The non-corrosive PVC conduit makes it ideal for commercial installations with moisture or chemical exposure.
Industrial settings
Various industrial spaces such as factories, manufacturing plants, and workshops use 20mm black conduit. In such cases, galvanized steel or flexible metal conduits are preferred. This is because they endure harsh chemicals, moisture, and heavy mechanical loads.
Outdoor and underground installations
To protect wiring from environmental elements, the 20mm black conduit is ideal for outdoor and underground applications. PVC and galvanized steel conduits are specially designed to withstand moisture, UV radiation, and soil acidity. In addition, it provides a robust protective layer for electrical cables in outdoor residential wiring, as well as underground utilities and outdoor lighting.
Residential electrical systems
20mm black conduit is often found in house construction. For example, it protects wiring within garages, basements, and other areas where wiring may be exposed to physical damage. Furthermore, it is mounted in dry areas, such as interior walls and ceilings, where the protection level of physical and mechanical damage is required. In addition, it helps in organizing electrical wiring and keeping systems safely separated from other types of conduit. Thus, providing a clear indication of different electrical components in the system.
Electrical and mechanical equipment protection
It is designed to provide protection and grounding for electrical components in machinery and equipment. Flexible conduit is commonly used in this scenario, as it can easily bend and accommodate movement.
Choosing the ideal black conduit of varying sizes, like the 20mm, depends on several factors. Below is a breakdown of these factors to ease the decision-making process.
Conduit material
The material for the conduit usually comes in PVC, galvanized steel, EMT, or flexible metal. Each of these materials has distinct properties. Therefore, the choice usually depends on the environment, the need for moisture or corrosion resistance, and mechanical protection. For example, PVC is a non-metal that offers moisture and corrosion resistance, while galvanized steel is firmer and more durable against the same threat.
Installation environment
The installation environment is another critical factor in determining the ideal conduit. For instance, a PVC conduit is ideal for outdoor and underground applications since it is non-corrosive and non-metal. Juxtaposed to that, metal conduit, especially flexible or galvanized steel, is better in conditions requiring mechanical protection. Also worth considering is whether the application is residential, commercial, or industrial. This is because each has distinct requirements that can guide the decision.
Application requirements
All it takes is a simple identification of the specific needs of the electrical system. For instance, flexible conduit is suitable in areas that require frequent movement or bending. Rigid conduits, on the other hand, are ideal for straight, long runs of protection. Furthermore, grounding capabilities are vital in many industrial and commercial areas. As such, rigid metal conduits like galvanized steel or EMT must be constructed for this goal.
Budget considerations
Generally, PVC conduits are pretty cost-effective compared to metal conduits. Additionally, the installation and maintenance cost of metal conduits is expensive.
Code compliance
The installation usually has to conform to local electrical codes and regulations. This usually recommends or necessitates particular kinds of conduit in varying scenarios. Therefore, it isn't a waste to check these codes before making an electrical conduit decision. In addition, compliance with these codes guarantees safety and performance.
A1. Its primary function is to protect wiring. Apart from that, it is also used to route electrical wiring through installations. For instance, it protects cables from mechanical damage, moisture, chemicals, and UV exposure. Also, it organizes and conceals the electrical wiring system.
A2. Yes, a 20mm black conduit can be used outdoors. PVC and galvanized steel types are designed explicitly for outdoor applications. PVC is waterproof and UV-resistant, while galvanized steel offers superior corrosion resistance.
A3. The installation process requires the cutting of the conduit to the desired length and the use of solvent cement to attach PVC fittings. The conduit should then be secured using appropriate straps at specified intervals.
A4. Physical damage like dents and visible rusting, especially in metal conduits indicating exposure to moisture, are good signs of conduit wear. Other signs include cracking in PVC conduit and frequent electrical failures or short circuits.
A5. The first and easiest way to maintain a 20mm black conduit is to regularly inspect it for signs of wear, rust, and physical damage. This routine may, at best, ensure issues are detected early as they are bound to come.
