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

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circuit will be allowed if the sockets have a spacing of not mole than four (4) inches to center to center. Branch circuit wires for each section for attraction board signs shall be carried to the distributing center of the section in rigid conduit. Provision shall be made for the ventilation of attraction board signs illuminated by lamps on the inside. Circuits for canopy ceilings shall be limited to sixteen (16) sockets. (C) LOAD. Mains feeding signs shall be calculated on the basis of full con- nected load, whether flashers are used or not, but in no case shall there be a capacity for less than ten (10) watt lamps. Where more than one reading matter is overlaid on a single panel and only one reading matter is illuminated at one time, the mains may be calculated on the basis of the maximum load at one time. (D) WIRING OF SOCKETS. Wires shall be soldered to terminals of sockets and exposed parts of wires and terminals shall be treated to prevent corrosion. (E) BUSHINGS. Approved bushings shall be employed to protect wires passing through walls or partitions of the sign structure. (F) SWITCHES. Each sign shall be controlled by a switch which will open all ungrounded conductors. If transformers are installed inside the building wall and switch shall be installed at the transformer location. Switch may be installed inside flat or recessed signs or letters if special permission is obtained. In these cases covers over handholes must be clearly marked with a metal tag to indicate loca- tion of switch. All switches shall be 0 to 30 ampere knife blade contact and if mounted outside of sign shall be in weatherproof enclosure. An electrically operated magnetically held contactor shall be employed as control switch on all neon signs requiring more than six (6) circuits. The coil circuit shall be controlled by single pole switches in series, one of which shall be located at magnetically held contactor. 12