ASHRAE 90.1-2007

Section: 9.1.4 - Luminaire Wattage

Toolbox

Luminaire wattage incorporated into the installed interior lighting power shall be determined in accordance with the following criteria:   New in 2007

1. The wattage of incandescent or tungsten-halogen luminaires with medium screw base sockets and not containing permanently installed ballasts shall be the maximum labeled wattage of the luminaire.

2. The wattage of luminaires with permanently installed or remote ballasts or transformers shall be the operating input wattage of the maximum lamp/auxiliary combination based on values from the auxiliary manufacturers’ literature or recognized testing laboratories or shall be the maximum labeled wattage of the luminaire.

3. For line-voltage lighting track and plug-in busway, designed to allow the addition and/or relocation of luminaires without altering the wiring of the system, the wattage shall be

   1. the specified wattage of the luminaires included in the system with a minimum of 30 W/linear ft or

   2. the wattage limit of the system’s circuit breaker or

   3. the wattage limit of other permanent current-limiting device(s) on the system.

4. The wattage of low-voltage lighting track, cable conductor, rail conductor, and other flexible lighting systems that allow the addition and/or relocation of luminaires without altering the wiring of the system shall be the specified wattage of the transformer supplying the system.

5. The wattage of all other miscellaneous lighting equipment shall be the specified wattage of the lighting equipment.

Exceptions:

None.