This is not good? Right...? Don’t you want isolation?
The problem is the use of 4 conductors in the cable twisted assembly instead of only 3 conductors. Hot, neutral, and equipment grounding, conductor.
Solution.
Armor Clad for Healthcare Facilities (AC-HCF) Aluminum Armor Clad for Healthcare Facilities (AC-HCF) is the best choice for Isolated Ground A/V systems. Like MC, it contains an additional grounding conductor, although with this type of cable it is permissible to use the metal jacket as the safety grounding conductor, as required with isolated ground installations. The biggest benefit is that the average proximity of the hot conductor and the neutral conductor with respect to the isolated equipment grounding conductor is nearly equal, virtually eliminating ground voltage induction (GVI), even on long runs.
Like MC, it contains an additional grounding conductor, although with this type of cable it is permissible to use the metal jacket as the safety grounding conductor, as required with isolated ground installations.
https://info.legrandav.com/l/71782/2018-12-14/7zh25n
"although with this type of cable it is permissible to use the metal jacket as the safety grounding conductor,"
Yeah, but..... There is a bare armor/bond wire that runs the entire length of the cable. The armor/bond wire is used to ground the outlet box and the supporting back strap of the duplex receptacle. The green insulated conductor, that is part of the twisted Hot and neutral conductor assembly, connects to the IG isolated ground terminal screw of the receptacle outlet. Three conductors twisted together. Hot, neutral, and IG equipment grounding conductor.
Interlocking aluminum strip Easy to identify green armor
Full size green insulated copper grounding conductor plus armor/bond wire combination provides redundant ground or isolated grounding capability
https://www.afcweb.com/ac-hcf-armored-cables/hcf-lite-aluminum-health-care-facilities-cable/.