I mean to say that the armour must be grounded if it is there.I really don't think a ground wire is required if a gfci is used.Do they use pyro/MI cable in res?The old bx had a strip that was originally intended for grounding(no longer accepted ).I'm almost positive if a gfci is used no ground wire is required as it samples for leakage to the neutral.Sheath is a general term and doesn't describe a specific type/design of material.Had an inspector tell me to fill in the ground prong hole on existing fixture mounted receptacles once to avoid a false sense of security.It,s probable a little different from province to province so...
