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SECTION 17. ` <br />OUTLINE LIGHTING - EXCEEDING 600 vOLTS: <br />(A) INSTALLATION OF CONDUCTORS. Conductors shall be installed as follows: <br />1. WIRING METHOD. Conductors shall be installed in rigid or flexible <br />metal conduit. Conductors may be run from the ends of tubing to the <br />grounded midpoint of transformers specificially designed for the purpose <br />and provided with terminals at the midpoint. Where such connections are <br />made to the transformer grounded midpoint, the connections betweep the <br />high - voltage terminals of the transformer and the line ends of the tubing <br />shall be as short as possible. <br />2. INSULATION AND SIZE. Conductors shall be of a type approved for the <br />purpose and for the voltage of the circuit, and shall be not smaller than <br />No. 14. <br />3. BENDS IN CONDUCTORS. Sharp bends in the conductors shall be avoided. <br />4. CONDUCTORS IN RACEWAXS, If the conductors are covered with lead or <br />other metal sheathing, the covering shall extend beyond the end of the <br />raceway, and the surface of the cable shall hot be injured where the <br />covering, terminates. In damp or wet locations, the insulation on all <br />conductors shall extend beyond the metal covering or raceway at least 4 <br />inches for voltages over 10,000; 3 inches for voltages over 5,000 but <br />not exceeding 10,000; and 2 inches for voltages of 5,000 or less. In <br />dry locations the insulation shall extend beyond the end of the metal <br />covering or raceways not less than 22 inches for voltages over 10,000; <br />2 inches for voltages over 5,000 but not exceeding 10,000; and 12 inches <br />for voltages of 5,000 or less. For conductors at grounded midpoint <br />terminals, no spacing is required. No more than 20 feet of cable from a <br />single transformer shall be run in metal raceway where the potential <br />between the cable and the raceway is more than 5,000 volts. <br />- 23 <br />