16-25. WALL RECEPTACLES: Wall receptacles shall conform to the requirements of Federal Specificatian W-R-15la, type and style as specified. Heavy-duty receptacles shall be of the single type having capacity to carry the rated load continuously without damage and shall be furnished with a suitable cord-grip cap. a. Duplex Convenience Receptacles: Duplex conven- ience receptacles shall be Type II, Style No. 102, rated 10 amperes at 250 volts and 15 amperes at 125 volts. shall be constructed of brown phenolic composition. Bases Ter- minals shall be mounted on the sides of the base with two screws per terminal. Not more than one conductor will be installed under one screw-head. Duplex convenience receptacles installed in damp or wet locations and where speci- fied shall be Type II, Style No. 130, 3-pole type designed for grounding, rated 10 amperes at 250 volts and 15 amperes at 125 volts. Mounting straps shall have plaster ears. bo. Single Flush, 3-Pole, 3-Wire, 20-Ampere, 250- c. 3-Phase, 4-Pole, 4-Wire, 20-Ampere, 250-Volt Volt Receptacles: Single Flush, 2O-ampere, 250-volt receptacles shall be Type II, Style No. 153. Receptacles: Receptacles for 20-ampere, service shall be Type II, Style No. 165. 250-volt, 3-phase lL. Junction boxes shall be National Electric Products Corporation #7525-58, or approved equal, equipped with #7565 standard tops. 2. Receptacle outlets shall be National Elec- 3. Telephone outlets shall be National -lec- tric Products Corporation #7903-L or equal equipped with duplex receptacles. tric Products Corporation #7904-L or equal. 16-26. WALL SWITCHES: Wall switches shall be of the to- tally enclosed tumbler type and shall conform to the re- quirements of Federal Specification W-S-896 or W-S-893. In addition to the spring actuating the switch, the opera= ing mechanism shall include a positive mechanical means tv initiate motion tending to close and/or open the circuit. Enclosures shall be phenolic composition. Not more than two switches shall be installed in a single gang position of a switch box. Single-pole three-way and four-way switc! shall be of the tumbler type, rated 10 amperes at lehvolt: All switches shall be suitable for the control of tungsten- 16-10