The metal jacket of AC is an equipment grounding conductor. The metal jacket of interlocking armor MC cable is not. 517 requires that the outer metallic jacket or the raceway be an EGC. It requires in addition an EGC in the raceway or cable. They will be tied together when the installion is in compliance with 517.13 (A) & (B).
You might want to look at this thread:
http://www.mikeholt.com/forum/Forum1/HTML/001860.html Don(resqcapt19)
[This message has been edited by resqcapt19 (edited 01-29-2002).]
