I was fixin to ask what we thought an approved method was. I notice the cable company has a cool "serving" machine (for you sailors) that wraps a wire around the strand and the cable as it goes along. I am not sure what the wire is but it does seem to hold up in the sub tropics.
Nope. Don't even think about it. Only cables as listed in Table 396.10(A).Unless your in an Industrial setting then you can use a few other conductors.
Liguidtite flexable metal conduit has no NEC limit to length. As long as you have no more than 4 bends, it's not subject to damage, the operating tempiture is observed & supported per 351-8.
Not saying I would do unneeded piping with LFMC just that there is no NEC limit.
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