Regulating the Erection, Construction, Repair, Alteration, Location of all Electric Signs

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10. Plastic sheets may not be used as a supporting means for current carrying parts or sources of illumination. 11. Approved solid type or hollow plastic letters or characters may be used provided they are not used as a raceway. (J) CATWALKS AND LADDERS. Catwalks for maintenance purposes on signs and sign structures shall be constructed of metal, Ladders on sign structures shall be at least fifteen (15) inches wide, Ladders on signs shall be metal and shall not be less than ten (10) inches wide. Horizontal projecting signs, the bottoms of which are more than 28, 0" above the public way, shall be provided with catwalks and handrails. Horizontal flat signs, the bottoms of which are more than 28' 0" above the way, shall be provided with catwalks and handrails unless signs can be maintained by means other than ladders supported from the way. Vertical signs, the bottoms of which are more than 281 0" above the way, or with a vertical dimension of more than 28' 0" shall have ladders the full vertical distance of sign. In addition, all signs in the above category which are more than 4' 0" wide shall be provided with a steel structure at top of sign for maintenance purposes. Structures over twelve (12) feet high used primarily to support illuminated signs shall be provided with ladders extending from roof or ground to top of structure and in addition, shall have catwalks so that all parts of display are accessible for maintence purposes. (K) MOVING PARTS. Signs employing the use of moving parts for animated action as well as clocks and thermometers shall be so designed that the driving mechan- ism and the driven linkage and the supporting bearings are securely anchored to the main steel structure of the sign, and the supports for the movable portions of the display must be calculated to support its weight plus the maximum wind pressure to which the movable portions may be subjected. Mechanical motions - 10 -