Load Calculation

[dhobdey1]

Did I do this right? I have 3- small apartments and 1- ice cream store in a building. I am attempting to do a load calculation to figure my mininum service size. I calculated the following:

ICE CREAM STORE 1482 SQ FT X 3 VA = 4446
ICE MACHINE 1080
COOKIE MACHINE 1350
SOUP WARMER 1200
REFRIGERATOR 1100
ICE CREAM MACHINE 5000
ICE CREAM MACHINE 5700
FREEZER 600
COFFEE 1800
REFRIGERATOR 600
EXPRESSO 4000
WASHER 1200
DRYER 5000
WATER HEATER 4500

TOTAL 37576

10000
REMAINDER @ .40 PERCENT 11030
20 KW HEAT @ .40 = 8000
TOTAL 29030
29030 / 240 = 121 AMPS
APARTMENTS POTENTIAL OF 3 APARTMENTS (2-EXISTING, 1- FUTURE)

525 SQ FT EA X 3VA= 1575
RANGE 8000
STACKED WASHER/DRYER 5000
WATER HEATER 4500
DISH WASHER 1200
TOTAL 20275

10000
REMAINDER @ .40 PERCENT 4110
2000 VA HEAT @ .40 PERCENT 800
TOTAL 14910
14910 / 240V = 62 AMPS


3 APARTMENTS (2-EXISTING, 1- POSSIBLY FUTURE) 62A X 3 = 186 AMPS
STORE/ICE CREAM 121 AMPS
TOTAL LOAD 307 AMPS



Is this correct? Thank you, dhobdey1

 

[Str1ve13]

I would refer to Article 220 of the NEC you are missing quite a bit. Ice Cream shop is considered a non Dwelling Unit and the Apartments are Dwelling Units.

Everything you need to calculate is in that section and is pretty self explanatory.

At quick glance it seems you are taking the dwelling unit demand calculation for general lighting / receptacles and using it for the entire loads minus the electric heating.

 

[haskindm]

You need to start over. Use the standard calculation for the ice cream store (Part III article 220). Don't forget show windows and signs. Also study 220.56 Kitchen Equipment. Then do a multifamily dwelling calculation for the apartments using either the standard calculation (part III) or the optional calculation (part IV).