Restaurant Demand Loads

[BatmanisWatching1987]

How do I calculate the Demand Load of 5 Restaurants that is being feed from the same incoming service (1,000 AMP (120/208V/3P).


The 1st of 5 restaurant, which is the new restaurant is going to need 400 AMPS(120/208V/3P)
The 2nd of 5 restaurant, which is the new restaurant is going to need 200 AMPS(120/208V/3P)
The 3rd/4th of 5 restaurant, which is existing restaurant is going to need 200 AMPS(120/208V/3P)
The 5th of 5 restaurant, which is existing restaurant is going to need 800 AMPS(120/208V/3P)
Note: Not All Electric Restaurant

I assumed I use Table 220.88. But I am not sure how to use this table since it's only calculating the new restaurant demand load. How do I add this load to the existing restaurant load.

 

[WA_Sparky]

Kinda shocked you can get away with all of that on a 1000A service..
Im assuming its all metered together under one owner? If thats the case I would have an EC go and do 30 day metering on the main panel of each existing restaurant to determine what the peak demand is for each existing businesses. If metered separately, call utility for 12month peak demand.
Next perform typical load calcs for the two new businesses after you have all devices and equipment accounted for. At that time you can determine if the existing 1000A service is large enough.

 

[Barbqranch]

Another question is do they all offer the same sort of schedule? If one or two are strictly breakfast lunch mostly M-F, and some are high end dinner only, that will reduce the load. Unless they are all food court lunch places, I wouldn't expect 5 similar restaurants together.

 

[WA_Sparky]

Another question is do they all offer the same sort of schedule? If one or two are strictly breakfast lunch mostly M-F, and some are high end dinner only, that will reduce the load. Unless they are all food court lunch places, I wouldn't expect 5 similar restaurants together.

30 day metering will meter for the peak current used during any 15 minute interval over 30 days. This will ensure if for some reason all businesses were in operation at one time (even if its not likely), the service would be safely sized to carry all the peak loads at the same time. Depending on your geographical location, summer or winter months will usually be your highest peak months due to excessive heating and cooling. In Washington I typically see larger loads during summer months.