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224- 1O HOMES AND CAMPS 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. Plywoods with component plies glued will ihenolic resins 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 number of openings in I in. (2.54 cm) measured from the center of a wire to a point 1 in. (2.54 cm) distant. The mesh of ex- panded metal is the smaller 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 inspector. Here are some things to check to assure that electrical installations are completed properly. (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 so that the danger from moisture will be minimized. All metal enclosures and other noncurrent -carrying metal parts should be effectively grounded. (d) Modern approved cables with a grounding wire or metallic enclosure properly grounded during installation should be used. Only grounding -type outlets should be installed on such circuits. Figure A44 1(a) Don't do this: N ke sure there are enough chwaical oudess to serve all appliam without overloading. (e) Since a great deal of ce older type electrical cir- cuits without a grounding w;re are still in use, particular attention must be given to other methods of properly grounding modern electrical appliances on such circuits, such as by clamping a grounding wire to a metal ground- ed cold water pipe. (f) Service drops between the service pole and the weather -head are a source of fire ignition and installa- tions must be made carefully to minimize the danger. All splices and connections in the service drop wire between the service pole (transformer) and weather -head must be made with proper connectors. Generally, this type of in- stallation is made by 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 do not bear the label of a recognized testing laboratory. The label or listing should be for the entire appliance or other assembly and not just for the cord alone. A-.J •1.4 Outdoor electrical receptacles are protected against weather by weatherproof covers. Always be careful to have dry hands and to be standing in a dry area when inserting or removing a connection from a live elec- trical circuit. A-4-1.5 Electrical circuits, tools and appliances are grounded to minimize shock hazard. This as particularly important when persons are using power tools outdoors and may be standing on wet grass, soil, 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 ex -nsion cords to their proper use-, such cords should not be run through walls, windows or doors or under carpets or be used for permanent wiring. (c) Replace frayed, worn or spliced or taQed cords im- medi, ely. Repairing of cords may result to additional hazards. (d) Disconnect all appliances such as toasters, portable space heaters, coffee pots, or hair dryers and pressing irons when not in use. (e) Extensions to permanent wiring often create serious electrical 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- pliances are found to be wearing out, or about to break- down, examine the entire appliance carefully for other possible faults. A4-3.1 In areas where lightning occurs frequently, in- stall lightning arresters for the main electrical service. Dwellings and cottages exposed in open areas where thunderstorm activity is frequent should be protected by a properly installed and maintained lightning rod system in accordance with NFPA 78, Lightning Protection Code, Section 21. A-5-1.1 Underwriters Laboratories, Inc., Chicago. Il- linois, publishes listings of patented chimneys.