PetesGuide
Member
- Location
- Foster City, CA, USA; NEC 2014
While installing some Ethernet cable in plenum spaces at a Red Cross facility, I've been fighting some battles with technology volunteers who think they can ignore the Code, and that doing so is safe.
One of the discussions pointed me to a Wikipedia article that they thought indicated plenum-rated wiring itself has only existed since the 1990s (!!!!!), and that led me to track down the origin of the plenum wiring requirement. I kept finding references to the "1975 MGM Grand fire", which led to the plenum requirements in NEC-1978.
But when I researched the 1975 fire, I discovered it was in fact a 1980 fire, and thus couldn't have caused the plenum requirements in NEC-1978.
That led me to this article: http://www.sdmmag.com/articles/84601-what-technicians-need-to-know-about-cable-the-nec
Does anyone here have the historical references that will shed light on this?
One of the discussions pointed me to a Wikipedia article that they thought indicated plenum-rated wiring itself has only existed since the 1990s (!!!!!), and that led me to track down the origin of the plenum wiring requirement. I kept finding references to the "1975 MGM Grand fire", which led to the plenum requirements in NEC-1978.
But when I researched the 1975 fire, I discovered it was in fact a 1980 fire, and thus couldn't have caused the plenum requirements in NEC-1978.
That led me to this article: http://www.sdmmag.com/articles/84601-what-technicians-need-to-know-about-cable-the-nec
Does anyone here have the historical references that will shed light on this?