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(1) TUBE TERMINALS. The terminals shall be so designed that the tubing can <br />be replaced without the necessity of exposing uninsulated live parts. If the <br />spring contact type of receptacle is used, it shall be so designed that, even <br />with the tube removed, the live spring will be recessed a distance equal to <br />three times the diameter of the receptacle opening. It is recommended that <br />the primary circuit be controlled by a relay that will open the circuit when a <br />tube in the secondary circuit is broken or removed. Live parts shall be pro- <br />tected by barriers which require other than ordinary tools such as pliers and <br />screw - drivers for removal unless access to the parts requiries the disconnection <br />of the primary circuit. <br />SECTION 16. <br />OUTLINE LIGHTING - 600 VOLTS OR LESS: <br />(A) INSTALLATION OF CONDUCTORS. Conductors shall be installed as follows: <br />1. WIRING METHOD. Conductors shall be installed in rigid metal conduit, <br />flexible metal conduit, electrical metallic tubing, armored cable or metal <br />troughing. <br />2. INSULATION AND SIZE. Conductors shall be of a type approved for <br />general use and for short leads permanently attached to lampholders or <br />ballasts, shall be not smaller than No. 14. <br />3. CONDUCTORS SOLDERED TO TERMINALS. Where the conductors are fastened <br />to lampholders other than of the pin type, they shall be soldered to the <br />terminals and the exposed parts of conductors and terminals shall be <br />treated to prevent corrosion. <br />4. LANPHOLDERS. Lampholders shall be of the unswitched type having <br />bodies of suitable insulating material and shall be so constructed and <br />installed as to prevent turning. Miniature lampholders shall not be <br />employed for outline lighting. <br />- 22 - <br />