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Table 220.42 provides demand factors for lighting loads for specific types of occupancies. For occupancies that are not in this list, the NEC does not provide any demand factor. That means the demand factor must be 100 percent.
The assumption is that the entire load could be on at the same time and does not assume that some part of the load would be off at any given time. Obviously, it would not make sense to apply a demand factor to a load that is known to be continuous, such as some lighting loads, all of which remains on for extended periods. The asterisk note at the bottom of Table 220.42 recognizes this point.
© Hughes Associates,Inc. 2012