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ASHRAE 60.1-2007


ASHRAE 90.1-2007 table 9.4.5 has the following allowances for exterior lighting power:

Stairways                                                          1.0 W/sq ft

Walkways less than 10 ft wide                 1.0 W/linear ft

Walkways 10 ft wide or greater                0.2 W/sq ft

 

This is reference in a general sense.  There is not a separate line item for ramps, so they
would fall under walkways.