How To Cut Flexible Metal Conduit

How to Cut Flexible Metal Conduit: A Comprehensive Guide

Cutting flexible metal conduit (FMC) might seem straightforward, but using the right tools and techniques ensures a clean, safe, and professional-looking finish. This guide covers everything you need to know, from choosing the right tools to finishing the cut. This will help you avoid damaging the conduit's integrity and ensure a safe electrical installation.

Why Cutting FMC Properly Matters:

A poorly cut FMC can lead to several problems. Sharp edges can cause injuries during installation. A jagged cut can damage the wires inside, leading to short circuits or electrical failures. Furthermore, an uneven cut can weaken the conduit, compromising its protective properties and making it unsuitable for its intended purpose. Therefore, precision is key.

Tools You'll Need:

• Heavy-duty bolt cutters: These are the most common and effective tools for cutting FMC, especially for smaller conduits. Choose a pair with strong jaws and a comfortable grip.
• Hacksaw with a metal-cutting blade: This is a suitable alternative for thicker or more stubborn conduit, offering more controlled cuts. Ensure the blade is sharp to avoid excessive force and a rough cut.
• Pipe cutter (optional): For extremely thick FMC or for cleaner cuts, a pipe cutter can be a worthwhile investment.
• Safety Glasses: Always protect your eyes from flying metal fragments.
• Work Gloves: Protect your hands from sharp edges and potential abrasions.
• De-burring tool (optional): This tool removes any sharp edges left after cutting, essential for safety and a professional finish. A file can be used as a substitute.

Step-by-Step Guide to Cutting Flexible Metal Conduit:

1. Measure and Mark: Accurately measure the required length of the FMC and mark the cutting point with a marker pen.

2. Secure the Conduit: Hold the conduit firmly but avoid applying excessive pressure which can bend or distort it. Use a vice or clamp if necessary, particularly when using a hacksaw.

3. Cutting with Bolt Cutters: Position the bolt cutters' jaws precisely at the marked point. Apply firm, even pressure to the handles and squeeze until the conduit is cleanly severed. Avoid twisting the cutters, which can create a ragged cut.

4. Cutting with a Hacksaw: Place the conduit securely in a vice or clamp. Position the hacksaw blade perpendicular to the conduit and begin sawing with slow, steady strokes. Apply even pressure to prevent the blade from wandering.

5. Cutting with a Pipe Cutter: Position the cutter’s wheel against the conduit. Tighten the cutter’s wheel gradually and rotate it around the conduit, tightening progressively until the conduit is cut. This method provides the cleanest cut.

6. De-burring: Once cut, use a de-burring tool or a file to smooth any sharp edges on both ends of the conduit. This critical step prevents injuries and ensures a safe installation.

Tips for a Clean Cut:

• Sharp Blades: Using sharp blades is essential for clean and easy cuts. Dull blades require more force and produce ragged cuts.
• Proper Grip: Maintain a firm, secure grip on your tools to avoid slippage and accidental injuries.
• Lubrication: When using a hacksaw, consider lubricating the blade with cutting oil or WD-40. This reduces friction, making cutting easier and producing a smoother finish.

Safety Precautions:

• Always wear safety glasses and work gloves to protect yourself from potential hazards.
• Ensure adequate ventilation if you are working in a confined space.
• Dispose of the cut-off pieces of FMC properly according to local regulations.

By following these steps and employing the right safety measures, you can confidently cut flexible metal conduit and complete your electrical installation safely and effectively. Remember, precision and safety are paramount throughout the process.