Wireing methods for mobiles

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I was called to inspect an office complex made up of 17 ea 12 x 60 mobiles, factory wired with NM cable, as I hadn't looked at a mobile in a while I re-read Articles 550 and 334. There are hundreds of these at this facility, to my surprise I discovered that in none dwelling mobiles with suspended ceilings NM cable is not allowed.
Is there an exception to this somewhere, nearly every trailer on site is wired with NM cable?
 
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