Types of Electrical Conduits and Their Uses

This article explains the types of Electrical Conduits, the most commonly used types of conduits for electrical installations, such as PVC, Rigid Metal Conduit (RMC), Electrical Metallic Tubing (EMT), and Liquidtight Flexible Conduit (LFMC). It details where each conduit is recommended for use and the reasons for their application.

There is a wide variety of conduits for electrical wiring. The purpose of a conduit is to protect the wiring. Because there are different environments, the type of conduit required varies.

General Considerations:

  • Selection Factors: The choice of conduit depends on the environment and cost. Sometimes using an expensive conduit where its specifications are unnecessary does not make sense.
  • Environmental Suitability: Each conduit type is suited for specific conditions, such as moisture, impact resistance, or flexibility.

1. PVC (Polyvinyl Chloride), types of Electrical Conduits

PVC conduit is ideal for underground use since it does not corrode in moist conditions. However, if exposed to sunlight, it becomes brittle over time.

  • Characteristics: Lightweight plastic material resistant to moisture and corrosion.
  • Uses: Primarily used for underground installations or indoors where it is not exposed to direct sunlight.
  • Reasons for Use:
    • Advantages: Resists moisture and corrosive environments, economical, and easy to install.
    • Disadvantages: Unsuitable for outdoor use under direct sunlight, as UV radiation degrades it over time, making it brittle.

2. Rigid Conduit (IMC or Galvanized Rigid Conduit, GRC)

Commonly referred to as “thick-wall galvanized conduit,” this is one of the most durable and expensive types of conduits. It is used in areas where the wiring is at risk of severe impacts, such as near heavy machinery.

  • Characteristics: Heavy-duty metallic conduit made from galvanized steel or aluminum.
  • Uses: Suitable for outdoor use or environments with risks of physical damage, such as factories, parking lots, or exposed areas.
  • Reasons for Use:
    • Advantages: Provides excellent mechanical protection against impacts and environmental elements.
    • Disadvantages: More expensive and heavier than other conduit types.

App recommended:

Cálculos eléctricos Norma 2012
Cálculos eléctricos Ios

3. EMT (Electrical Metallic Tubing)

Also known as “thin-wall galvanized conduit,” EMT is similar in use to rigid conduit but is more economical and less durable. It is commonly used in indoor areas where impacts are likely but less severe than in industrial environments.

  • Characteristics: Thinner and lighter metallic conduit typically made of steel or aluminum.
  • Uses: Used indoors or in protected areas where heavy impacts are not expected.
  • Reasons for Use:
    • Advantages: Lightweight and cost-effective, providing sufficient protection for wiring in controlled environments.
    • Disadvantages: Less resistant to impacts and unsuitable for unprotected outdoor installations.

4. Liquidtight Flexible Conduit

Flexible conduits are ideal for areas with multiple bends, making it easier to route wiring through challenging spaces.

  • Characteristics: Flexible conduit made from metal or plastic, designed to adapt to curves and tight spaces.
  • Uses: Ideal for connections in areas with limited access or installations with multiple bends, such as electrical panels, equipment, or machinery.
  • Reasons for Use:
    • Advantages: Flexible and easy to install in complex areas, providing adequate protection for wiring in indoor applications.
    • Disadvantages: Less resistant to impacts compared to rigid conduit and not recommended for environments with constant movement or harsh outdoor conditions.

Choosing the Right Conduit for the Job, types of Electrical Conduits

Conduit TypeRecommended UseReason
PVCUnderground, indoorsResistant to moisture, cost-effective, degraded by UV.
Rigid ConduitOutdoors, harsh areasHigh impact resistance, ideal for rugged environments.
EMTIndoor protected areasLightweight, economical, suitable for controlled environments.
LiquidtightTight or complex areasFlexible, ideal for bends and tight spaces.

This guide offers practical advice for selecting the appropriate conduit depending on the environment and installation requirements.

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