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Building Ordinance continued -12- (m) All electrical outlets used for portable electrical tools shall be provided with three wire polarized plugs, and all por- table electric tool cables shall be of the three -conductor type, and shall be grounded in accordance with the National Electrical Code. (n) All electrical switches, panels, wiring and other temporary electrical equipment shall be maintained in a safe and ser- viceable condition by qualified electricians. Qualified electricians shall be required to patrol installations when considered necessary by the Electrical Inspector, for safety to life while in use• by other trades. All disconnect switched controlling temporary light and power, except emergency lighting such as barricades and walkways shall, when considered necessary by the Electrical Inspector for safety to life and property, be locked in the "off" position where there is no qualified electrician on the job. (o) Separately metered conductors shall not be installed in the same raceway, except in load gutter in meter room. (p) In the wiring of cold -storage plants and rooms or buildings of similar character, all wires used for light, heat or power shall be installed in rigid galvanized or sherardized metal threaded conduit,'and galvanized metal outlet boxes, cut-out and distribution cabinets and fittings installed. Conduits shall be installed in such manner that they will drain to the outlets and cabinets conductors installed in conduit must comply with the National Electrical Code Standard for damp or wet locations. All conduits entering or leaving refrigeration boxes must have an approved seal -off fitting. (q) The minimum wire capacity for window display lighting shall be not less than 100 watts per linear foot and shall not exceed six outlets per circuit including the convenience receptacles and not more than two receptacles with each lighting circuit. The minimum size wire for these circuits shall be 20 amp. capacity. A minimum of two outlets shall be required at least one above the one below. All fixed lighting shall be equipped with switches. (r) Permanently installed electrical space heaters in bathrooms shall be installed so that heaters will not be easily exposed to combustible materials. But said heaters shall not be installed behind doors, under or near towel racks, or near shower curtains or window curtains. Each heater must be on a separate circuit with a minimum wire size of No. 12 AWG or larger. (s) One branch -circuit for signs shall be provided for each store frontage for each individual occupancy, said outlets to terminate outside, on or near the front of the building. Sign outlets and window lighting shall be controlled by wall switches. (It is suggested that these switches be installed near panel, so that time clock installation, if desired, will be conveniently located and less unsightly.) (t) Sufficient bathroom and toilet lighting must be installed and must be controlled by wall switches only. (u) For protection against rust or corrosion, all steel or iron outlet boxes, junction boxes, cabinets, gutters, and similar type equipment subject to rust or corrosion, shall be protected with a zinc or cadmium coating by either the galvanizing or sherardizing process. (v) Wiring of slim line or end to end fixtures shall be as follows: Asbestos 1,000 volt No. 14 wire or RH No. 12 wire will be accepted for circuit wiring of fixtures that are installed end to end, to the extent of the supply of that circuit passing through fixture