These requirements cover electric signs@ referred to as signs@ using incandescent lamps@ fluorescent lamps@ HID lamps@ neon tubing and other combinations@ for use in accordance with the National Electrical Code@ NFPA 70.The signs covered by these requirements include@ and are not limited to@ awning signs@ channel-letter signs@ directional signs@ ordinary box signs@ recessed signs@ trailer-mounted signs@ and other similar signs.These requirements do not cover units specifically intended for billboard illumination@ "EXIT" lights@ show-window signs using skeleton neon tubing with exposed wiring@ or illuminated clocks in which a potential of 600 volts or less is involved.These requirements do not cover signs not provided with electrical means for illumination.These requirements do not cover signs specifically intended for connection to a circuit of limited power supplied by a Class 2 transformer with 30 volts or less output. These requirements cover signs that incorporate a Class 2 transformer as an integral part of the sign.These requirements do not cover the trailer of a trailer-mounted sign.These requirements do not cover field-assembled signs for outline lighting. These requirements cover outline lighting that is factory assembled and that is capable of being sectionalized for shipping purposes.The following types of signs that do not include words or symbols are also covered by these requirements:a) An incandescent-lamp sign provided with a flasher@ or means for remote installation of a flasher;b) A sign without a face and having a trough@ track@ or similar parts for field installation of a rigid or a flexible face and advertising material. See 40.1.13;c) An illuminated module of a sign used as a spacer between modules containing words or symbols;d) An outdoor sign intended for use as outline lighting. See 40.4.1; ande) A sign having a blank face that is intended to have advertising material applied prior to the installation of the sign. See 40.1.12.These requirements do not cover electronic controls covered by the Standard for Control Centers for Changing Message Type Electric Signs@ UL 1433. However@ this does not preclude the use of these types of controls in signs when they are used in accordance with 2.1.1.