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224 10 HOMILY AND CAMn IN FOREST AREAS under fire exposure. Noncombustible type of finish materials (e.g., metal lath and plaster: gypsum board and cement asbestos board, etc.) are satisfactory for in. terior finish. Plywoods which delaminate under heat or moisture are undesirable. Plywoo ds with component plies glurf with phenolic resin.: are recommended A-3-5 Clean gutters and the roof of needles and leaf ac cumulations. A-3-6.1.4 The "mesh" of woven wire is the nuinber of openings in 1 in. (2.54 cm) measured from the center of a wire to a Imint 1 in. (2.54 cm) distant. The mesh of ex panded metal is the smallei of two dimensions of the dia- mond shaped openings. A-4-1.1 Electrical installation for dwellings should be inspected and approved by an authority having jurisdic- tion, such as an electrical i-spector. Here are some things t ' rck to assure that electrical installations are complete property. (a) Make certain that fuses or circuit breakers of the correct capacity are used for the electrical circuits. If the fuse or circuit breaker is of the incorrect capacity, then electrical overload of the circuit may cause overheating of the wiring and breakdown of the insulation, with fire resulting. (b) All wiring should be fastened securely to recep- tacles and fixtures. Frayed or loosely connected wiring can result in arcing and shock hazards. (c) Fuse and circuit breaker panelboards should be located in a dry area in that the danger from moisture will be minimised. All metal enclosures and other noncurrent carrying metal parts should be effectively fly -wed (d) Modern approved cables with a grounding wire or metallic enclosure properly grounded during installation should be use#t. Only grounding tvpe outlets should be installed on such circuits. FIV" Ital Dip"'i 8a "I make lore Bisset RR trNone \ tsar Wall wales is nerve all s}PiiasAM +ri bM4 o erlaality. (e) Since a gr*at deal of the tAder type ek[trical cis cutts wtthout a grounding shire are still to use, particular attention must tie Riven to other methods of propt-rly grounding modern electrical appliances on such circuits, such as b) clamping a grounding wire to a metal ground- ed cold water pipe. (f) Service drops between the service pole ane weather head are a source of fire ignition and int t Lions must be made carefully to minirni; the danger. All splices and connections in the service- drop -#ire between the service pole (transformer) and weather -head must be made with proper connectors. Generally, this type of in- stallation is made bs power utility companies. (g) A drop cord or lamp holder is built to carry safely only the current demanded by a lamp bulb and will overheat when used for appliances drawing more current. (h) Discard appliances that du not bear the label of a recognized testing laboratory. The label or listing st,ould be for the enure appliance or other arse nbh and not just for the cord alone. A4-1.4 Outdoor electrical receptacles are protected against weather by weatherproof covers. Always be careful io have dry hands and to be standing in a dry area when inserting or removing a connection from a live elec- trical circuit. A44.5 Electrical circuits, tools and appliances are grounded to minimize shock hazard. this is partizularly important whets persons are using power tools outdoors and may be standing on wet grass, sail, or other moist surface. Make certain that the tool or appliance is grounded properly or double insulated. (a) Never allow curtains, draperies and similar flam- mable or combustible fabrics, plastics, or paper products close to electric lamp bulbs. (b) Restrict extension cords to their proper use, such cords should not be tun through walls, windows or doors or under carpets or be used for permanent wiring. (c) Replace frayed, worn or spliced or taped cords im mediately. Repairing of cords may result in additional hazards. (d) Disconnect all appliances such as toasters, portable space heaters, coffee pots, or hair dryers ar.d pressing irons when not in use. (e) Extensiom 'o permanent wiring often create serious tlectrical fire hazards because of improper joints and splices and the use of lamp cord as extension material. (f) When certain parts of electrical equipment or ap planes are found to be wearing out, or about to break down, "&mine the entire appliance carefully for other possible faults. A-4-3.1 In areas when lightning ciccurs frequently, in mall lightning arresters for the main elettrua; service Dwellings and cottages exlx:Esed in open areas where thunderstorm activity is frequent slumid be pr.xt4 ted by a properly installed and maintained lightning rod system ►n accordance with NFPA Ili, Lightning Protrctto" Code. Section 21. A-5-1.1 Underwriters Labormotws, Im Chicago 11 lints, rublahcs lis -no of patented thininevs.