Alright another question for you. Again I am working through Mike Holt's Master Prep book. In the book they refer to column C of T220.55 as being over 8 3/4 kw. My problem is that I don't see any documentation to this effect. Am I missing something?
I thought the reason might be that column B (and A) would always be less than column C (when they apply accordingly). But that doesn't seem to be the case either.
For example; figure the feeder/service calculated load for 20 ranges at 8 3/4 kw. According to column C, we scroll down to find 20 appliances and follow it over to find 35 kw maximum demand.
If we use note 3 which allows column B to be used instead. We scroll down to 20 appliances and follow it over to 28% and multiply that by our connected load of 20x8.75kw. I come up with 49kw. In this case column C allows for a smaller demand factor. Which you would want to use right?
Which brings me back to why does the book (pg. 292 step 5 example) state "Over 8 3/4, and less than 12kVA, look up the kW Demand Load in Table 220.55, Column C.
If given the choice which I believe the code book offers in this situation, you would want to use the column C methodology.
As always any input is appreciated.