Re: Type MC-HL Cable
Is "MC-HL" a UL designation? - YES
I've found one MC-HL cable from General Cable. Is anyone aware of other manufacturers? - YES, Okonite - Type CLX. Canada Wire & Cable does also. Any Type MC with a "continuously corrugated" outer sheath will probably meet the requirements.
Has anyone designed/installed any Cl I Div 1 haz-location systems using this method instead of RMC with sealing fittings?- YES and it works well. It is in common use on offshore drilling platforms.
Robert B. Alexander, P.E.
"I know that you believe you understand what you think the NEC says, but I am not sure you realize that what you read is not what it means." (Corollary to Charlie's Rule)
Answers based on 2014 NEC unless otherwise noted.