1.1 These requirements cover electrical cables consisting of one or more current-carrying copper, aluminum, or copper-clad aluminum conductors with or without either or both grounding conductor(s), and one or more optical-fiber members, all under an overall jacket. These electrical and composite electrical/optical-fiber cables are intended for use (optical and electrical functions associated in the case of a hybrid cable) in accordance with Article 645 and other applicable parts of the National Electrical Code (NEC) under the raised floor of a computer room.Cables complying with these requirements are:
1.- Voltage Rating 600 volts, Flame Test: (b)
2.- same as Type DP-1 except Flame Test: (a)
3.- Voltage Rating: 300 volts, Flame Test: (b)
4.- same as Type DP-2 except Flame Test: (a)
5.- Voltage Rating none - for use in signaling circuits meeting the following requirements for maximum available voltage, current and power.

30 volts ac max. and/or other circuits designated60 volts dc max. DP-3 in accordance with42.4 volts peak max. the requirements in the100 VA max. Standard for Safety of8 amps max.Information TechnologyEquipment - UL 1950Flame Test: (b)
1.- same as Type DP-3 except Flame Test: (a)

1.2 Smoke and fire considerations are as follows for the cables covered in the requirements:
1.TYPE DP-1P, DP-2P and DP-3P CABLES - These cables are to be tested for smoke and flame characteristics in accordance with the Standard Test for Flame-Propagation and Smoke-Density Values for Electrical and Optical-Fiber Cables Used in Spaces Transporting Environmental Air, UL 910. A cable that complies exhibits a maximum flame-propagation distance that is not greater than 5 ft, 0 inch, or 1.52 m, a peak optical density of smoke produced of 0.5 or less (32 percent light transmission), and an average optical density of smoke produced of 0.15 or less.