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e combustibility of a building is evaluated in two different ways. It can apply to either the building <br />' cture, or to the finish surface materials applied to the inside or outside in combination with the <br />structure. A noncombustible material is either: <br />1. a material of which no part will ignite and burn when subjected to fire; or _ <br />2. a material having a structural base of noncombustible material as defined above, with a <br />surfacing material not over 1/8-inch thick which has a flame-spread rating of 50 or less. <br />- .. .. . , . <br />~ <br />.. ;r , - ~Y1~' • <br />:~';:~. . , : {';~^ a: ~•'';~•~a~: <br />The above ~efinitions are direct quotes from Section 9 116 of the Unifcrm r=iro Code of the National <br />r=;re °~ot~c` ~~ ~~~~cia~,.. <br />To give some examples of flame spread characteristics, refer to the chart below. <br />Flame Spread Ratings Of Selected Materials <br />Material Flame Spread <br />Aluminum Siding (with baked enamel finish on one side) 5 to 10 <br />Brick or Concrete Block 0 <br />Gypsum Board (with paper on both sides) 10 to 25 <br />Northern Pine (treated) 20 <br />`~ Southern Pine (untreated) 130 ta 190 <br />' Plywood Paneling (untreated) . 75 to 275 <br />~ Plywood Paneling (treated) 10 to 25 <br />Consequently a building, fence, carport or other structure can be considered noncombustible only if it <br />is constructed of all noncombustible materials per condition #1 above, or if its structural components <br />conform to condition #1 and the exterior meets condition #2. <br />So when siting oil-filled equipment per STD. LC-255-10-01 and STD. LC-257-10-01, only buildings <br />whose structural members are steel (with approved fire coatings), brick, or concrete with an outside <br />surface having a flame spread rating of 50 or less can be considered noncombustible. All other <br />designs require increased clearances between the structure and the oil-filled unit. The installation of <br />metal siding or brick/stone facing on a wall constructed of wood studs does not meet the above <br />definition of a noncombustible structure. <br />PGE PROPRIETARY MATERIAL - THIS iNFO iS BPSED ON dSSUMPTICNS 8 CRRERIA WHICH MAY NOT BE VPLID OUTSIDE THE PGE ELECTRIC SYSTEM - FOR INTERNAL USE ONIY <br />COMBUSTIBILITY CRITERIA <br />PAD-MOUNTED TRANSFORMERS <br />P.G.E. CO. STANDARD <br />DESIGN I X I CONSTRUCTION <br />T & D STANDARDS <br />DATE 1-1-96 <br />LC-257-10-02 <br />~ <br />