Demand Load Calculations

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rjken1969

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Princeton, NJ
I'm looking fora simple solution to do demand/connected load calculations for large retail/commercialprojects. SKM would be my first choice, but it's not in the budget at the smallfirm I'm with. I'm looking for something that can apply the factors allowed in220 for kitchen, general receptacle loads, etc...

I have seen some excel spread sheets, but nothing that actually applies 220without excessive manipulation. Is there a simple programs that won't costthousands for this?
 
rjken1969 said:
Is there a simple programs that won't costthousands for this?
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You make your own spreadsheet, a piece at a time, and when you're done you will understand this section better than anyone.
You might get pretty good accuracy, which brings up the question: "Since this is a probability issue, how accurate does this need to be?"
What part do you want to start with?
 
rjken1969 said:
I was really looking for a quick easy solution.
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How much would you expect to pay for this, assuming it exists? Supply and demand will govern the minimum price.
If you get 5 or so quotes for something you want, this pretty much tells you what the market is willing to pay for this.

In any case, Excel will come in handy many times and many people on many forums will help you with it.
 
rjken1969 said:
I'm looking fora simple solution to do demand/connected load calculations for large retail/commercialprojects. SKM would be my first choice, but it's not in the budget at the smallfirm I'm with. I'm looking for something that can apply the factors allowed in220 for kitchen, general receptacle loads, etc...

I have seen some excel spread sheets, but nothing that actually applies 220without excessive manipulation. Is there a simple programs that won't costthousands for this?
Click to expand...

I am not aware that SKM does Load Calculations. I've used it when the basic design is done for short circuit contribution for equipment AIC ratings. Later on during construction, use the protective device coordination, arc flash analysis, harmonics, motor...etc. It is expensive and also you have yearly maintenance.

For load calculations, I've used my own spreadsheet. Most of my projects are highrise, commercial, industrial, or retail...and it is unique everytime. You usually start the estimate based on kw/SF based on the type of facility; plus a certain % contingency. Eventually, you progressively fine tune the load calculation based on the demand from your actual design (in the end, adding up the demand from switchboards/panel schedules, etc).

You can start with a spreadsheet that is similar to your project; and work from there. You'll have to develop a knack for excel.
 
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