BX cable, also known as armored cable (AC) or metal-sheathed cable, is widely used in residential and commercial wiring for its durability and grounding properties. But cutting BX cable can be tricky without the proper method or tools.
how to cut bx cable
Whether you're a DIY homeowner or a professional electrician, this guide shows you the best way to cut BX cable, with or without specialty tools, while avoiding damage to the internal conductors.
🧰 What Is BX Cable?
BX cable (aka AC cable) includes:
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A flexible spiral metal armor sheath (usually steel or aluminum)
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Insulated conductors (typically black, white, and ground)
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Often includes a bonding strip or wire in contact with the metal armor
Unlike MC (Metal-Clad) cable, BX does not have a full-sized ground wire; instead, the armor and bonding strip together serve as the grounding path.
⚙️ Tools Needed
Best Option (Recommended):
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BX Cable Cutter (like a Roto-Split or Armor Edge tool)
➤ Fastest and safest method
Alternative Tools:
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Hacksaw or rotary tool (e.g., Dremel)
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Lineman’s pliers or side cutters
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Utility knife (for any wrap inside)
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Metal file (to smooth edges)
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Anti-short bushing (especially for older BX without bonding strip)
✂️ How to Cut BX Cable (Step-by-Step)
Step 1: Measure and Mark
Measure how much jacket you need to remove (typically 6–8 inches), and mark the spot with a Sharpie or tape.
Step 2: Insert Into the Cutter
Feed the cable into your BX cutter, aligning the blade with the mark.
Step 3: Rotate to Score
Turn the handle to rotate the cutting blade around the armor. You’ll feel it getting easier as the cut completes.
Step 4: Snap and Remove
Bend the cable slightly at the cut point, and the armor should snap cleanly. Use pliers to twist off the end.
Step 5: Trim and Inspect
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Ensure the bonding strip or conductor insulation isn't damaged.
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Cut back and retry if you nick the wire.
Step 6: Install Anti-Short Bushing (Optional but Recommended)
Insert a red plastic bushing into the cut end to prevent sharp metal edges from damaging insulation.
🔧 How to Cut BX Cable Without a Tool
If you don’t have a BX cutter, use this manual method with care:
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Score the Armor
Use a hacksaw or Dremel to lightly cut around the armor.
⚠️ Don’t cut too deep—you might damage the wires. -
Bend and Snap
Flex the cable to open the scored seam. -
Twist Off Armor
Use pliers to remove the outer metal sheath. -
Deburr and Bushing
Smooth sharp edges with a file and add a bushing for safety.
🛠️ Pro Tips
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Always wear gloves and safety glasses. The cut metal edges are very sharp.
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Avoid overcutting. Even a small nick on insulation requires restarting.
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Use a flashlight. It helps inspect if the bonding wire is intact.
🧠 FAQ: Common BX Cutting Questions
Q: Can I use a regular wire cutter to cut BX?
A: No—standard cutters will dull quickly and may crush the cable rather than cut it. Use a proper BX cutter.
Q: What’s the difference between BX and MC cable?
A: MC has a dedicated ground wire inside; BX uses the metal armor plus a bonding strip as the ground path.
Q: Do I need an anti-short bushing?
A: Most BX installations benefit from one, especially older cables without clear bonding strips.
✅ Final Thoughts
Cutting BX cable doesn’t have to be a frustrating or risky process. With the right tool—or even with careful manual techniques—you can achieve clean, safe cuts in minutes.
Want smoother, faster installations? Invest in a BX cable cutter and always check for internal wire damage before connecting.
