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a minimum of 12 inches of air or by an approved non - absorptive non- combust- <br />ible insulating bushing or receptacle suitable for the voltage. <br />2. In the exposed type when not easily accessible hanging free in air <br />and not less than lg inches from conducting or combustible material shall - <br />be enclosed by an approved sleeve of non - conductive and non - breakable type. <br />This sleeve shall overlap all live parts by at least 11 inches and shall <br />be of a type which will afford the protection intended of it and approved <br />for the purpose. <br />(D) CONTROL. Signs shall be controlled by externally operable switches which <br />shall disconnect all ungrounded conductors. Switches shall be within sight of <br />the installation and shall have a capacity not less than twice the current <br />rating of the transformers. <br />(E) WIRING ABOVE 600 vows. <br />1. Conductors for circuits operating at a potential in excess of 600 <br />volts shall be of a type approved for the purpose, suitable for the voltage <br />involved and shall be not smaller than No. 14 and shall, if within a sign <br />or other enclosure, be supported on insulating supports placed not more <br />than two feet apart which separate the wires at least 2 inches from each <br />other and from conducting materials. <br />2. Conductors within a sign shall have rubber compound or other approved <br />insulation; provided that where conductors are entirely enclosed within <br />a sign enclosure and the enclosure cannot be opened without breaking the <br />primary circuit, they may be bare. <br />3. Sharp bends in the conductors shall be avoided. <br />4. Conductors shall be installed in conduit, electrical metallic tubing <br />or armored cable. Approved insulating bushings shall be used where the <br />gas tube cable enters or leaves the conduit or electrical metallic tubing. <br />5. Where conductors hang freely in air away from combustible or conducting <br />- 28 - <br />