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(1) The metallic covering is impervious to moisture. (2) A lead sheath or moisture impervious jacket is provided under the metal covering. (3) The insulated conductors under the metallic covering are approved for use in wet locations. (See Section 30O-5) (b) Type AC. Metal-clad cable of the AC type may be used in dry locations; for under plaster extensions as provided in Article 344; and embedded in plaster finish on brick or other masonry, except in damp or wet locations. This cable may be run or fished in the air voids of masonry block or tile walls; where such walls are exposed or subject to excessive moisture or. dampness or are below grade line, Type ACL cable shall be used. This cable shall contain lead covered conductors (Type ACL), if used where exposed to the weather or to continuous ~ moisture, for underground runs and embedded in masonry, concrete or fill in buildings in course of construction, or where exposed to oil, or other conditions having a deteriorating effect on the insulation. Type AC metal-clad cable shall not be used where prohibited elsewhere in this Code, including (1) in theatres, except as provided in Section 520-4; (2) in motion picture studios; (3) in any hazardous locations; (4) where exposed to corrosive fumes or vapors or to weather; (5) on cranes or hoists, except as provided in Section 610-11 Exception No. 3; (6) in storage battery rooms; (7) in hoist- ways or on elevators, except as provided in Section 620-21; or (8) commercial garages where prohibited in Article 511; (9) Type AC or ACL Metal-clad cable may only be used in single family and duplex dwellings and their accessory building~ SECTION 41: That the Santa Ana Municipal Code is hereby amended by amending Section 8-940 thereof to read as follows: Section 8-940. Non-Metallic Sheathed cable. Section 336-3 of the National Electrical Code, 1968 Edition, is 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. Typ~ 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 out- side 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. -20-