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What is interlocked armored cable?

Interlocked Armor is constructed of steel or aluminum tape spirally warped and formed around a cable to create the sheath or armor. As the name indicates, the tape is formed in a manner that each layer "interlocks" with the previous layer. Interlocking provides for flexibility in the finished product. Most of these cables comply with NEC Type MC (Metal Clad). A PVC jacket is commonly applied over the armor. Uses include direct burial, in tray and in free air.


Usually galvanized steel or aluminum is used in interlocked armor. Other metals, however, are sometimes used in specific applications. During and after installation, the interlocking structure protects the cable from harm. The armor can be introduced straight to the insulation or to an inner vest.


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