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If you are asking about the aluminum strip just underneath the armour, it is for sheath bonding as it has a shorter distance from end to end than that of the spiral that makes up the armour covering.

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Q: Why extra bare aluminum wire in Armored cable?
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What color is the grounding wire in armored cable?

In older types of armored cable a aluminum strip was used as a bonding medium. This strip was wound back over the outside of the sheath and the connector on the end of the cable was used to secure it. Test were made to see how much short circuit current could be handled by this type of installation and it failed usually by burning open and leaving no ground at all. Now all armored cable has a separate, usually bare copper wire, embedded in with the current carrying conductors. This ground wire is now terminated onto a lug found in the junction box or on the device the cable is connected to.


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