Demand VS Connected. What to use?

[Timona]

I am doing total load calculation of a building in Excel.
I am using the numbers from the panel schedules.

Now, what should I be using from the panel schedules? The demand load or the connected load?

 

[wwhitney]

I am doing total load calculation of a building

For what purpose? That will affect what methodology you must or should use.

Cheers, Wayne

 

[Timona]

For what purpose? That will affect what methodology you must or should use.

Cheers, Wayne

Utility company. I need to give them the calculations.

 

[Sunny_92]

I typically provide the connected load on the utility load sheet.

 

[LarryFine]

I'd say both if you can. Demand load is what will matter.

 

[Timona]

Update: My boss chewed me up and said it was demand. So, I had to revise my excel spreadsheet. It didn't take me long though.

 

[kingpb]

Update: My boss chewed me up and said it was demand. So, I had to revise my excel spreadsheet. It didn't take me long though.

Typically, you show both.

 

[lielec11]

I've always shown total connected load on utility load letters. The utility company will use their own data and calculations of what they think the demand load will be. Typically much much lower. For your clients sake, and your design as well, I'd only give them the connected which is what you should be designing around as well.

 

[Revous]

For NJ, the utilities typically only want to see one final number so you have to pick between demand and connected.

I would say give them whatever numbers you used to size your main service equipment, I use the demand load, but I know some people use connected. Like others have said, I once had a utility in PA send me their demand calculations (I wish I had saved it) and they take 60% of your HVAC load, and some low % for the lighting loads based on your building type.

Demand loads are already probably double whatever the meter will read and the connected load is even higher than that. They utility has a better handle on how much actual load each building/building types are using since they have the data to run the statistical analysis on it.

 

[Flicker Index]

Demand Factor-Diversity Factor-Utilization Factor-Load Factor

Not all these rated loads are turned on at once. If they were, then the 100A supply fuse would rupture, as it cannot pass 192A. So the diversity

electrical-engineering-portal.com

 

[LarryFine]

That's why I said demand is what matters.

 

[petersonra]

Use the load calculations in the nec. It will be less than the so called connected load, but two or three times what the typical real load will be in most cases.