AC Standar ds and Practices in .NET

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AC Standar ds and Practices
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Table 93 ABYC AC Load Calculation Form
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Line Loads Column A Column B
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LIGHTING AND SMALL APPLIANCES
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1 2 3 4 5 6 7
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Lighting and receptacles: Living area sqft 2 Small appliances: number of 20-amp circuits 1,500 Line 1 + Line 2 (Line 3 2,000) 035 (Enter 0 if less than 0) Line 3 + Line 4 Line 5/System voltage (either 120 or 240) If 120 VAC, enter Line 6 in Column A; if 240 VAC, enter 50% of Line 6 in both A and B
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MOTORS AND HEATERS (total nameplate amps)
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Exhaust and supply fans Air conditioners (If two, enter larger number; if three or more, enter 75% of total; omit if less than Line 10) Heaters (If two, enter larger number) (If gure is less than Line 9, enter 0) 25% of largest motor in Lines 8 10 Total of Lines 8 11
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FIXED APPLIANCES (nameplate amps)
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Disposal 01 Water heater 10 Wall oven 075 Stovetop cooking unit 075 Refrigerator 10 Freezer 10 Ice maker 05 Dishwasher 025 Clothes washer 025 Clothes dryer 025 Trash compactor 01 Air compresser 01 Battery charger 10 Vacuum system 01 Sum of other xed appliances Total of Lines 13 27; if more than three xed appliances, 06
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FREE-STANDING RANGE
29 30 31 32
Load watts from Table 94 Nameplate volts (either 120 or 240) Line 29 divided by Line 30 Sum of Lines 7, 12, 28, and 31; TOTAL is larger of A and B
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AC Load Calculations
AC Load Calculations
Example
Use Table 95 to calculate the 120 VAC load for a boat with 240 square feet of enclosed space (not including engine compartment or chain locker), one 20-amp small appliance circuit, and: 50-watt (04 amp) ventilation fan 1,500-watt (12 amp) water heater 85-watt (07 amp) refrigerator 120-watt (1 amp) air compressor 420-watt (35 amp) battery charger
Fixed Appliances (Lines 13 28) Our xed appliances include the 12-amp water heater, 07-amp refrigerator, 35-amp battery charger, and 1amp air compressor The rst three have a duty factor of 10, so we enter their amps directly The compressor has a duty factor of only 010, so we enter 010 10 amp = 01 amp on Line 24A
Adding Lines 13 through 27 we get 163 amps Since there are more than three xed appliances, we multiply the sum by the factor 060 and enter the result, 98, on Line 28
Lighting and Small Appliances (Lines 1 7) The lighting load is 2 240 square feet = 480 watts, which we enter on Line 1
The small appliance load for one 20-amp circuit is 1 1,500 watts = 1,500 watts, which we enter on Line 2 The sum of lines 1 and 2 is 1,980 watts, which is less than 2,000 watts, so we enter 1,980 watts on Line 3 and 0 watts on Line 4 We divide 1,980 watts by 120 volts to get 165 amps Since 120-volt shore power only has one branch, we enter the 165 amps on Line 7A
Total AC Load (Line 32) Adding Line 7 (165 amps), Line 12 (05 amp), Line 28 (98 amps), and Line 31 (00 amps), we get 268 amps Since our system has only a single phase and, thus, a single branch, our total AC load for sizing the main AC panelboard is 268 amps Rounding up, we ll call it 30 amps
Table 94 Load Watts for Free-Standing Ranges (For use in Table 95, Line 29)
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