How to Run Conduit Through an Exterior Wall

Running conduit through an exterior wall is a crucial skill for any DIY enthusiast or electrician. Whether you need to install electrical wiring, cable, or any other utility, doing it safely and efficiently is essential.

How to Run Conduit Through an Exterior Wall

In this comprehensive guide, we’ll take you through the process step by step, ensuring you have a solid understanding of how to run conduit through an exterior wall while adhering to safety standards.

Understanding the Basics of Conduit

Before we dive into the installation process, it’s essential to grasp some basic concepts about conduit.

What is Conduit?

Conduit is a tube or pipe used to protect and route electrical wires, cables, and other utilities. It serves several purposes, including:

  • Protection: Conduit shields wiring from physical damage, moisture, and environmental factors, reducing the risk of electrical fires and other hazards.
  • Organization: It helps organize and bundle wires, making it easier to identify and maintain the electrical system.
  • Compliance: In many regions, using conduit is a requirement to comply with electrical codes and safety standards.

Types of Conduit

There are various types of conduit available, each suitable for specific applications:

  1. Rigid Metal Conduit (RMC): Made of galvanized steel, RMC is a robust and durable option, suitable for outdoor and industrial use.
  2. Intermediate Metal Conduit (IMC): Similar to RMC but lighter and more cost-effective, IMC is a popular choice for many applications.
  3. Electrical Metallic Tubing (EMT): Made of thin-walled steel or aluminum, EMT is a lightweight and easy-to-bend option often used for residential electrical installations.
  4. PVC Conduit: Made of polyvinyl chloride, PVC conduit is non-metallic and resistant to corrosion, making it ideal for wet or corrosive environments.

Step-by-Step Guide: Running Conduit Through an Exterior Wall

Step 1: Gather Your Supplies

Before you begin, make sure you have all the necessary tools and materials:

  • Conduit: Choose the appropriate type and size of conduit for your specific application.
  • Conduit Fittings: You’ll need connectors, couplings, and conduit bodies as required.
  • Conduit Benders (if necessary): For bending metal conduit, a conduit bender is essential to create smooth bends without kinking the pipe.
  • Conduit Straps or Clamps: These secure the conduit to the wall surface.
  • Hole Saw or Conduit Knockout Punch: For creating holes in the wall.
  • Cable Pulling Tools (if necessary): If you’re running wires or cables through the conduit, you’ll need tools for pulling them.
  • Electrical Tape and Sealant: To seal connections and protect against moisture.

Step 2: Plan Your Conduit Route

Before drilling any holes or installing conduit, plan your conduit route carefully. Consider factors like the shortest and safest path, avoiding obstacles, and ensuring compliance with local building codes.

Step 3: Drill Holes

Use a hole saw or conduit knockout punch to create entry and exit points for the conduit. Ensure the holes are large enough to accommodate the conduit and any required fittings.

Step 4: Attach Conduit to Wall

  1. Insert Conduit: Feed the conduit through the holes, ensuring it reaches from the source to the destination.
  2. Secure Conduit: Use conduit straps or clamps to secure the conduit to the exterior wall at regular intervals. Ensure the conduit is level and plumb.
  3. Install Conduit Fittings: As needed, attach connectors, couplings, and conduit bodies to create a continuous conduit run.

Step 5: Seal Wall Penetrations

To prevent water, pests, and drafts from entering your home through the conduit openings, seal around the conduit where it penetrates the wall using electrical tape and an appropriate sealant. This step is crucial for maintaining the integrity of your home’s insulation and weatherproofing.

Step 6: Pull Wires or Cables

If you’re using the conduit to run electrical wires or cables, this is the time to pull them through the conduit. Use cable pulling tools as necessary to guide the wires smoothly through the conduit.

Step 7: Make Connections

Connect the wires or cables to the appropriate electrical boxes or devices at each end of the conduit run. Ensure all connections are properly secured and adhere to electrical code standards.

Step 8: Test and Inspect

Before sealing everything up, test the electrical system to ensure it’s functioning correctly. Check for any loose connections or issues with the conduit run. Once you’re satisfied, proceed to the final step.

Step 9: Seal Exterior Wall Openings

Use a suitable exterior-grade sealant to seal around the conduit where it penetrates the wall from the outside. This extra layer of protection helps to keep out moisture, drafts, and pests.

Safety Precautions

Safety should always be a top priority when working with electrical systems and running conduit through exterior walls. Here are some safety precautions to keep in mind:

  • Turn Off Power: Ensure that the power to the circuits you’re working on is turned off at the circuit breaker or fuse box.
  • Wear Appropriate Safety Gear: Use safety goggles, gloves, and other protective gear to protect yourself from potential hazards.
  • Check for Gas and Water Lines: Before drilling any holes, verify the location of gas and water lines to avoid accidental damage.
  • Follow Local Codes: Adhere to local building codes and regulations to ensure your installation is safe and compliant.
  • Seek Professional Help: If you’re not comfortable with any aspect of the installation, or if you’re dealing with complex electrical systems, consider consulting a licensed electrician.


Running conduit through an exterior wall is a task that requires careful planning, precise execution, and a strong commitment to safety. By following the step-by-step guide outlined in this article and adhering to safety precautions, you can successfully install conduit for various applications, including electrical wiring, data cables, or any other utilities.

Remember that when in doubt, seeking professional assistance is always a wise decision to ensure a safe and reliable installation.

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