You can secure your wires and cable against water, heat, corrosion and intrusion damage with suitable conduit materials. Weighing the differences between metallic and non-metallic conduits can help you select the right materials and protection levels for your applications.
How Are Metallic and Non-MetallicConduits Similar?
Metallic and non-metallic conduits can both protect electrical wiring in variousapplications like heating, outdoor lighting and underground cabling. Metal conduits are excellent for industrial applications like protecting wiring on railway lines andcables in walls and floors.
A non-metallic conduit is made from materials like polyvinyl chloride(PVC), polyamide,polypropylene and polyurethane. Businesses can use pliable conduits in numerousoutdoor and indoor applications, like protecting indoor residential wiring and cables in swimming pools.
What Is the Difference Between Metallic and Non-Metallic Conduits?
While metallic and non-metallic conduits can serve the same purposes, they differ significantly. Understanding and comparing their differences can help you decide which option to choose.
l Price
Non-metallic conduits can be less expensive than metallic. Metals are thicker than plastic and can cost more to manufacture. Metal conduit manufacturing can also require more intricate tools and specialized skills, and the manufacturing timeline can be longer. Plastic is a lighter material and takes less labor to manufacture. Plastic can also be more readily available for conduit manufacturing.
l Application
Businesses can use non-metallic conduitsfor applications like residential wiring in concrete surfaces and walls to protect against electrical faults and fires. In addition, PVC conduits are great for securing electrical ceiling wires.
Rigidmetal conduits are ideal for exposed cables along building walls, attics and outdoor areas. Applications for flexible metal conduits include more complex,high-pressure environments like wiring in aerospace equipment. Steel conduitscan also be used as grounding or earth conductors to carry electrical current safely through power supplies.
l Weight
Plastic can weigh less than metal conduits, making it easier to install these options in various positions and at different angles. Rigid metallic conduits are often heavier, but are ideal for withstanding heavy loads and underground environments.
l Strength
When it comes to durability, metal is the more robust material overall. Metal conduit can withstand extreme high and low temperatures and last for many years. For example, businesses can use metalconduits for grounding wiring in snow and extreme heat as well as high vibration and force on railway lines.
l Corrosion Resistance
Non-metallic conduits can often withstand wear and corrosion like warping, rotting and rust better than metalcounterparts. While businesses can use metallic and non-metallic options indamp, humid locations, metal conduits may require a plastic coating to prevent water and chemical damage.
l Recyclable
If sustainability is a priority, metallic conduits are typically a more eco-friendly option. Aluminum is one of the most reusable materials, though many plastics like PVC are also recyclable.
l Safety Rating
While metallic and non-metallic options canbe safe for numerous uses, rigid metallic conduits often have a high erelectrical safety rating since they resist high electrical voltages and can protect against electrical hazards.
Which Type of Conduit Should You Use?
Consider factors like size, cost and safetyto select the right conduit solution for your needs.
l Conduit Fittings
Selecting a suitable conduit fitting material is vital. Whether the fitting is plastic or metal, it must offer the same moisture resistance and corrosion resistance as the conduit. Consider fittings like liquid-tight plastic for liquid-tight conduits or metal fittings for rigid metallic conduits.
l Safety Requirements
It’s important to follow local andnational safety regulations when selecting an electrical conduit. Varioussafety codes offer specific directions on conduit installations, inspections and circuit approvals. Businesses must also choose conduit materials that are appropriate for their specific application.
To ensure safety, it’s essential to consider factors like moisture, wear, pests, vibrations, chemical resistance and heat resistance depending on industry application, location and conditions.
l Size
A conduitshould be the right size for the specific job at hand. Determining the proper conduit diameter is crucial to ensure a secure fit and prevent moisture damage. It’s also important to think about application in order to choose the right size. For example, underground electrical protectioncan require longer conduits, while a heating system may need shorter or smaller tubes.
l Project Goals
Various conduits offer benefits like liquid resistance, flexibility and easy installation, so your choice should align with the specific project’s goal.
For example, a liquid flexible metalconduit (LFMC) can offer hardness and water resistance and is versatile — idealfor protecting wiring in water treatment facilities. In contrast, liquid-tightflexible non-metallic conduit can be suitable for interior andexterior use in dry or wet conditions.
l Customization and Availability
Equipment and projects can vary, requiring specialized conduits, fitting designs and sizes. Consider suppliers who can tailor conduits and fittings to meet various requirements. In addition, some parts can take longer to manufacture than others, so determine the availabilityof options and if a supplier can meet project demands on time.
