All types of clamp-on portable spotlights shall be protected from metal-to-metal contact by having electrical insulating pads or wrapping material permanently attached to the lamp holder clamp. 

Use of ceramic-porcelain or molded composition type of neck-shell is the only type approved for use in the San Francisco Convention Facility.  On/off switches are usually located in the neck.

Where any spotlight or lamp is subject to physical damage, damp places, or comes into contact with combustible material, it shall be equipped with a substantial guard attached to the lamp holder or the handle. 

Flexible cord extensions may only be used for portable lamps/appliances that are of allowable amperage for the size and type of three (3) conductor cords connecting to and for the utilization of any equipment.  The third conductor is used for equipment grounding purposes.