Thank you , Bill for your answer.
Some times is easy to know where we have non-coincident loads.
I had a carpenter shop with very reduced square feet, only the owner and may be one more person could be there at the same time, but he had 13 diferent equipments to work the wood in different ways.
Neither technologically nor phisically more than three equipments will be running at the same time, but AHJ requested an electrical or mechanical interlock.
I have never seen interlocks used in that way in a carpentry shop.
Now I have to increase the electrical feeder for one bay in a warehouse. A lot of bays are empty and all of them have 200 A for each.
Utility Co. can give me the maximum demand for a year, but, it is a very old data base because they are been closed since 2008.(Existing data base from 2008 is around 76 A maximum demand for each bay).
If I will take the measure it will be a ridiculous data too due to the same reason, but if I make the calculation, existing service of 1200 A is not enough.
I have seen all kind of factories here, where a lot of motors are working, but feeders are rationally sized.
Bibliography such as Industrial Power System Handbook, by Donald Beeman (1955) talks about these factors for industrial system designs, inside factories, no for utility services.
I don't know how can they be accepted by AHJ but I know they are been accepted before.
Again, thaks a lot for your answer. I think this is a good discussion.