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Emergency Circuit 12-Volt Fixture Choices
AerisTM Luminaires, Architectural Sconces, TWF1 and TWAC - DC12 | Aeris ASW luminaires and Architectural Sconces (WSR, WST, WSTM and WSQ) are available with either one- or two-lamp configurations of 20-watt or 35-watt MR11 lamps. These lamps fit into the same area on the reflector tray as the test switch and indicator light for the integral battery pack.
The application information to the right demonstrates
the area of coverage with the Architectural Sconce mounted at 12', while
the DC12 option is in operation. The DC12 option is also available in
the TWAC Series with either 20- or 35-watt lamps in one- or two-lamp
configurations. The DC12 lamps mount to a special fixed bracket attached
to the component cover on either side of the main reflector. Providing
two lamps will prevent leaving an area in total darkness if one of the
lamps should fail. | | WSR with (1) 35W DC12 12' Mounting Height  | | TWAC with (2) 35W 2DC12 12' Mounting Height
 | | TWAC with (1) 20W DC2012 12' Mounting Height  | | TWAC with (2) 20W 2DC2012 12' Mounting Height 
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| To address the growing need of emergency egress lighting and the requirements of the Life Saftey Code, Lithonia Lighting now provides the DC12 emergency circuit option. This feature equips the fixture with one or two 12-volt DC bayonet base 20-watt or 35-watt MR11 lamps. Low-voltage lamps, powered by an external battery source, are provided in addition to the HID lamps and will supply illumination along the path of egress when there is a power interruption to the primary HID source. In a typical application, the emergency 12-volt power would be supplied from a battery source external to the fixture, usually located within the building by an emergency lighting unit such as Lithonia's Indura or Titan Series (refer to diagram A below ). Labeled leads that connect to the battery source are provided. | 
| | TABLE 1 | LAMP TYPE | | DC Options | Initial Lumens
(per lamp) | 10° Spot | 29° Spot | DC2012
(1) 20W lamp | 350 | | X | 2DC2012
(2) 20W lamps | 350 | X | X | DC12
(1) 35W lamp | 660 | | X | 2DC12
(2) 35W lamps | 660 | X | X | | Table 2 below illustrates the distance, by wire size, allowed between the battery source and emergency luminaire at 5% maximum voltage drop per National Electric Code. 12-Volt DC Voltage Drop Table
Distance between battery pack & luminaire
(5% maximum voltage drop) | TABLE 2 | | | Wire Size | DC2012
(1) 20W lamp | 2DC2012
(2) 20W lamps | DC12
(1) 35W lamp | 2DC12
(2) 35W lamps | | 16 AWG | 35 ° | 15° | 20° | 10° | | 14 AWG | 50° | 25° | 30° | 15° | | 12 AWG | 85° | 40° | 50° | 25° | | 10 AWG | 140° | 70° | 80° | 40° | | If using an HID source as your primary lamp, it is recommended that a time delay (TD) option be used in the emergency lighting unit so that the DC12 lamp stays on until the HID lamps come up to full brightness. The chart below outlines a few of the battery sources available from Lithonia Emergency Systems that will work in conjunction with the DC12 option in Lithonia HID products. | | Lithonia Emergency Products | TABLE 3 | | Series | Nomenclature | Lamp Heads
Watts/lamp | Output
Volts | Remote Wattage Available | | Indura | IND12150 XTRA | 9 | 12 | 132 | | Titan | ELT125 TD | 12 | 12 | 101 | |
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