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Estimating Connected and Demand Loads

Estimating Connected and Demand Loads

(OP)
I'm trying to find a comprehensive reference for estimating connected and demand loads very early on in a new project based on VA/sf (or W/sf)

I've used the very abbreviated list in IEEE 241 (old Gray Book) Table 15, but would like to find something more comprehensive and if nothing else, more up to date (IEEE 241 is from 1990).
http://cursos.eie.ucr.ac.cr/claroline/backends/dow...

Very often when working with an Architect for a large building, I want start the conversation with the utility company about available service sizes and capacities in the area. I often just use a rule of thumb like 20 W/sf overall for mixed use commercial, but don't have a reference to stand behind me.

Keep in mind, since this is to estimate service size, it needs to be connected load because the NEC Article 220 is very conservative with it service calculation methods. I realize the utility will have different methods (more liberal = smaller) to determine my service size, but I'm stuck with NEC calculations in the US.

Thanks

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