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Working with Metal Clad Cable

The proper techniques for cutting and securing metal clad, or BX, cable.
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Metal clad cable, also known as armored or BX cable, is a flexible metal conduit with a wire bundle, consisting of individually insulated conductors covered by a flexible spiral-wound layer of metal. Most often used for feeder and service power in commercial and multi-story residential applications, the steel or aluminum clad cable is more resistant to damage from puncture or abrasion than non-metallic sheathed cable.

Step 1
Using a tool called a Roto-Split, the metal sheath of the cable is split to expose the insulated wire. A rotary tool with a cut-off wheel can also be used.
  
Step 2
The conductor wires are usually covered in a paper jacket in addition to the wire's PVC insulation.
  

     
   

Step 3
A plastic bushing is slid over the end of the metal cladding to prevent the cladding's sharp edged from damaging the conductor wires' insulation.
  
Step 4
The bare ground wire is wrapped around the metal sheathing at each cut end. Insure the bushing protects the wire’s insulation from the cable's metal sheath.
  

     
   

Step 5
The cable is inserted into an electrical box and held in place by a clamp. Final electrical connections can now be made.
    

Editors note:
Local codes vary on the use of metal clad cable in residential applications. Always check with a local building inspector before beginning a new project.


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