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224-10 HOMES AND CAMPS IN FOREST AREAS <br />under fire exposure. Noncombustible type of finish <br />materials (e.g.. metal lath and plaster, gypsum board <br />and cement asbestos board, etc.) are satisfactory for in­ <br />terior finish. Plywoods which delaminate under heat or <br />moisture are undesirable. Plywoods with component plies <br />glued with phenolic resins are recommended. <br />A-3-5 Clean gutters and the roof of needles and leaf ac­ <br />cumulations. <br />" A-3-6.1.4 The “mesh” of woven wire is the number of <br />openings in 1 in. (2.54 cm) measured from the center of a <br />wire to a point 1 in. <2.54 cm) distant. The mesh of ex­ <br />panded metal is the smaller of two dimensions of the dia­ <br />mond shaped openings. <br />A-4-1.1 Electrical installation for dwelling should be <br />inspected and approved by an authority having jurisdic­ <br />tion, such as an electrical inspector. <br />Here are some thinn to check to assure that electrical <br />installations are com(Heted properly. <br />^ “ (a) Make certain that fuses or circuit breakers of the <br />i correct capacity are used for the electrical circuits. If the <br />fuse or circuit breaker is of the incorrect capacity, then <br />electrical overload of the circuit may cause overheating of <br />the wiring and breakdown of the insulation, with fire <br />resulting. <br />• (b) All wiring should be fastened securely to rccep- <br />tades and fixtures. Frayed or loosely connected wiring <br />^ can result in arcing and shock hazard. <br />(c) Fuse and circuit breaker panelboards should be <br />located in a dry area so that the danger from moisture <br />will be minimized. All metal enclosures and other <br />noncurrent-carrying metal parts should be effectively <br />grounded. <br />___(d) Modem approved cables with a mounding wire or <br />metallic enclosure properly grounded during installation <br />should be used. Only grounding-type outlets should be <br />installed on such circuits. <br />Figure A-4-l.l(a) Don’t do thiil Make lure there arc enough <br />electriatl outlets to serve all appliances without overloading. <br />(e) Since a great deal of the older-t^e electrical cir­ <br />cuits without a grounding wire are still in use. particular <br />attention must be given to other methods of properly <br />grounding modern electrical appliances on such circuits, <br />such as by clamping a grounding wir to a metal ground­ <br />ed cold water pipe. <br />(f) Service drops between the service pole and the <br />weather-head are a source of fire ignition and installa­ <br />tions must be made carefully to minimize the danger. All <br />splices and connections in the service drop wire between <br />the service pole (transformer) and weather-head must be <br />made with proper connectors. Generally, this type of in­ <br />stallation is made by power utility companies. <br />(g) A drop cord or lamp holder is built to carry safely <br />only the current demanded by a lamp bulb and will <br />, overheat when used for appliances drawing more current. <br />(h) Discard appliances that do not bear the label of a <br />recognized testing laboratory. The label or listing should <br />be for the entire appliance or other assembly and not just <br />for the cord alone. <br />A-4-1.4 Outdoor electrical leceptacles are protected <br />against weather by weatherproof covers. Always be <br />careful to have dry hands and to be standing in a dry area <br />when inserting or removing a connection from a live elec­ <br />trical circuit. <br />A-4-1.5 Electrical circuits, tools and appliances arc <br />grounded ;o minimize shock hazard. This is particularly <br />important when persons are using powor tools outdoors <br />and may be standing on wet grass, soil, or r-her moist <br />surface. Make certain that the tool or appliance is <br />grounded properly or double insulated. <br />(a) Never allow curtains, draperies and similar fiam- <br />mable or combustible fabrics, plastics, or paper products <br />close to electric lamp bulbs. <br />(b) Restrict extension cords to their proper use; such <br />cords should not be run through wal's, windows or doors <br />or under carpets or be used for permanent wiring. <br />(c) Replace frayed, worn or spliced or taped cords im­ <br />mediately. Repairing of cords may result in additional <br />hazards. <br />(d) Disconnect all appliances such as toasters, portable <br />space heaters, coffee pots, or hair driers and pressing <br />irons when not in use. <br />(e) Extensions to permanent wiring often create <br />serious electrical fire hazards because of improper joints <br />and splices and the use of lamp cord as extension <br />material. <br />(0 When certain parts of electrical equipment or ap­ <br />pliances are found to be wearing out. or about to break <br />down, examine the entire appliance carefully for other <br />possible faults. <br />A-4-3.1 In areas where lightning occurs frequently, in­ <br />stall lightning arresters for the main electrical service. <br />Dwellings and cottages exposed in open areas where <br />thunderstorm activity is frequent should be protected by <br />a properly installed and maintained lightning rod system <br />in accordance with NFPA 78, Lightning Protection <br />Code, Section 21. <br />A-5-1.1 Underwriters Laboratories, Inc., Chicago. Il­ <br />linois, publishes listings of patented chimneys.