Ampacity of NM cable in thermal insulation. The following commentary is concerning 2008 NEC 334.80 and is based on my understanding of Article  334.80. If there are questions please contact the authority having jurisdiction in your area. Article  334.80 in the 2008 NEC requires ampacity reduction of NM cables when more than two (2) NM…

SPRAY FOAM AND FIRE SPRINKLER PIPES There seems to be a surge of stories about spray foam being incompatible with CPVC sprinkler pipe.  There have been numerous reports and studies done on it. Bressler Insulation offers this observation on the matter.  Bressler Insulation has not provided any testing and this observation is based on our…