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In combustible buildings in several jurisdictions here in the Lower Mainland where a number of fire alarm systems are being upgraded, I've seen instances where they allow you to surface run unarmoured fire cable down a hallway and then cover it with crown moulding. You still have to firestop all the wall penetrations though. If you're running cable behind drywall, it doesn't have to be armoured (and you can tack it to the wall studs as you would Lumex). All exposed wire runs have to be physically protected with surface wire-mould, EMT or flexible armour (BX).
Additionally you must follow the fire equipment manufacturer's recommendation with respect to wire type and gauge. This is one aspect of the installation where deviations won't be allowed.
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