Article 348.60 requires an equipment grounding conductor be installed "where flexibility is required" for the installation. I know that FMC is installed mainly for the ease of installation and not because flexibility is needed. If we need flexibility due to vibration is one thing but most time it's just easier to use "greenfield". The State of Michigan requires an EGC in all flexible wiring methods regardless. The only exception is FMT. What do other States require?
