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SECTION 8321. Non-Metallic Sheathed Cable. section 336-3 ks hereby amended to read as follows: 336-3. Use. Non-metallic sheathed cable shall not be used for exposed wiring and shall only be used for concealed wiring on single family or duplex dwellings as follows: (a) Type NM. This type of non-metallic sheathed cable may be installed for concealed work in normally dry locations. It may be installed or fished in air voids in masonry block or tile walls where such walls are not exposed or subject to excessive moisture or dampness. Type NM cable shall not be installed where exposed to corrosive fumes or vapors; nor shall it be embedded in masonry or concrete and covered with plaster or similar finish. (b) Moisture and Corrosion-Resistant Type NMC. This type of non-metallic sheathed cable may be installed for concealed work in dry, moist, damp or corrosive locations, and in outside and inside walls of masonry block or tile. Where embedded in plaster or run in shallow chase in masonry walls and covered with plaster within 2 inches of the finished surface, it shall be protected against damage from nails by a cover of corrosion- resistant coated steel at least 1/16" in thickness and 3/4" wide in the chase or under the final surface finish. (c) Uses not Permissible for Either Type NM or NMC Non- metallic Sheathed Cable. These types shall not be used as: (1) Service-entrance cable, (2) in any hazardous location, (3) embedded in poured cement, concrete, or aggregate. SECTION 8322. ~on-Metallic Sheathed Cable. Section 336-6 is hereby deleted. SECTION 8323. Non-Metallic Sheathed Cable. Section 336-9 is hereby amended to read as follows: 336-9. In Accessible Attics. Cable in accessible attics roof spaces shall also conform with Section 334.13. or SECTION 8324. Riqid Metal Conduit. Section 346-1 is hereby amended to read as follows: 346-1. Use. Rigid metal conduit may be used under all atmospheric conditions and occupancies, and shall be galvanized, sheradized, or equal, and shall be required in concrete or masonry floors and walls, underground and outside of buildings or where exposed to weather. (Underground raceways may be of other approved materials.) Rigid metal conduit installed underground shall be buried a minimum of one foot under grade level unless protected by at least four inches of concrete. Where practicable, dis- similar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action. (See Section 300-5 for limitation in the use of ferrous raceways and fittings protected from corrosion solely by enamel.) SECTION 8325. ~lectrica~ Meta.~ic Tubinq. Section 348-1 is hereby amended to read as follows: 348-1. Use. Electrical metallic tubing may be used for both exposed and concealed work. Electrical meta~ic tubing protected from corrosion solely by enamel shall not be used. Electrical metallic tubing shall not be used (1) where during installation or afterwards it will be subject to severe physical damage; (2) for installations underground, in slabs, or where exposed to the weather, or excessive moisture. Where practicable, the use of dissimilar metals throughout the system shall be avoided to eliminate the possibility of galvanic action. (See Section 300-5 for limitation in the use of ferrous raceways and fittings protected from corrosion solely by enamel.) -19-