Demand Factor Question?

Yes, but No... as in all things, answers are not cut and dried.

Table 14 speaks to the watts per square meter and demand factors allowed for service conductors and feeders for various types of occupancies.

All "Office" areas have a basic load of 50 watts per sq meter.

As per CEC rule 8-210(b), other loads that may be in the office area such as electric space-heating, air-conditioning, power loads, show window lighting, stage lighting, are not included in that 50 watts per sq meter value.

So... given an office area of 1200 m2... (not inside another facility).

First 930 m2 = 930 x 50w = 46,500w of base load.

Service demand factor for the first 930 m2 is 90%

So the first 920 m2 contributes...

46,500w x 0.9 = 41,850w of minimum service ampacity

For the remaining area...

1200 - 930 = 270 m2

270 x 50w = 13,500w of base load.

Service demand factor for the remaining area is 70%

13,500w x 0.7 = 9,450w of minimum service ampacity

So the contribution to the minimum ampacity of the service is...

41,850w + 9,450w = 51,300w for the office portion of the service.

You must add any other demand based on other equipment, as mentioned above minus any demand factors allowed by other areas of the code for that additional equipment.

For an office area "inside" another occupancy fed by a feeder and not by "service conductors", follow the same process only using the 100% and 90% values as indicated in the table.