Regarding commercial buildings, lighting branch circuits: we add up the lighting fixture wattages and always use 125% for demand factor for the load because lighting is continuous load. Is this wrong? I'm trying to have it proved that it's right by NEC, but....Looking into NEC 2014 210.20(A), 125 percent is required for the overcurrent protection and not for load. NEC 2014 table 220.42 shows the lighting load demand factors, where for a commercial office building the demand factor would be 100%. Is there any other section of the NEC which tells us that commercial office building lighting load demand should be at 125%? Thank you!