Just out of curiosity what other cable is sold today or in the past has a metal sheath?And the Armour must be grounded regardless 12-608.
This type of installation falls to the inspector to decide on the rational.I have to say Ive seen gfci recepts replace two prong plugs without a ground wire and pass.Rational was that the gfci samples leakage the neutral not the ground wire.The only metal sheath cable i see in res is the old smooth bx.I blew the disk out of L3 three weeks ago and have been on a steady diet of cyclobenzeprine and oxycodone but i can't be that stoned,or can i?Anyhow i think the rational is that the bx must be grounded at the same potential as the rest of the system.So with a plasic box you need to slap a grounding ring on the bx connector.Hope i'm making some sort of sense here.
cheers




[This message has been edited by frank (edited 03-02-2006).]