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, ` � SS 7 � I <br /> August I, 1997 <br /> G-8550-4-434 <br /> To: D. S. Dauenhaucr Oli-13 <br /> cc: L. C. VnnTassel OF-10 <br /> Subject: Building 45-03 <br /> Reference: Meeting,July 30, 1997, D. S. Daucnhaucr and A. W. Richter, <br /> regarding electrical conduit passing through painl mix room i <br /> without plug seals in conduit at penetration of wall subject <br /> building <br /> Fire Protection Engineering has conducted a rcvicw of the electrical installation in thc <br /> paint mix room of the subject building. This room is part of the original Uuilding <br /> construction and was constructed with explosion-proof fixtures throughout without <br /> considcration as to specific occupancy. The paint mix room is open to the adjacent hall <br /> and lacks any fire rated separations. The occupancy of this room consists of an aircraft <br /> paint mixing operation utilizing four one-gallon and one five-gallon paint shakers as well <br /> as a amall enclosed paint booth and a ventilated hood system to remove flwnmable <br /> vapors when the paint is poured into five gallon containers or clean-up operation of <br /> equipment is required. This room does not meet the requirements of a Group H,division <br /> 2 or 3 occupancy since it lacks fire rated separation and the quantities of paint stored in <br /> the room,or in preparation for ahaking or in open containers is less than the exempt <br /> amount for a control area. <br /> Based on the above factors, Fire Protection Engineering would view this room as a Group <br /> F,division I occupancy. Electrical requirement for specific equipment requires rated <br /> enclosures in accordancc with Article 500 of the NEC but would not require all equipment <br /> in the room to be rated. This condition is similar to retail paint supply outlets that shake <br /> paint and have rated equipment in the immediate vicinity of the equipment,but does not <br /> have all equipment in the area approved fbr Class I, division 2 locations. <br /> Article 501-5 (b)of the Nntional Electrical Code requires conduit seals when the run passes <br /> from lhe Class I boundary into an unclassified location. The existing room is nol a Class l, <br /> division 2 area as currently utilized. Operations involving liberation of flammable vapors <br /> are extremely limited and the likelihood of a release of paint from a single shaker causing a <br /> ,, <br /> I „� <br /> ' `':� <br /> i '�`'�: <br /> i r„';t� <br />