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System Capacity – load Calculator

DIRECTIONS FOR NEC 2011, ARTICLE 220, PART IV

220.80 Optional Feeder and Service Load Calculations (RESIDENTIAL)

NFC REFERENCE

SECTION CAN BE USED FOR DWELLING UNITS

220.82 (A)

Served by a single feeder conductor (generator)

• 120/240 volt or 208Y/120 volt service
• Ampacity of 100 amps or greater the calculated load will be the result of adding
• 220.82 (B) General Loads, and

220.82 (B)

• 220.82 (C) Heating and Air-Conditioning Load

220.82 (C)

• Calculated neutral load determined by 220.61 . (Additional 70% demand factor can be

taken for cooking appliances and dryers when tables 220.54 and/or 220.55 are used)

GENERAL LOADS

220.82 (A)

General Lighting and General-Use Receptacles

• Calculate at 3 VA per square foot

220.82 (B) (1)

• Use exterior dimensions of the home to calculate square footage – do not include

open porches, garages or unused or unfinished spaces not adaptable for future use.

• Add 20-amp small appliance & laundry circuits @ 1500 VA each

220.82 (B) (2)

Calculate the following loads at 100% of nameplate rating

220.82 (B) (3)

• Appliances fastened in place, permanently connected or located on a specific circuit

220.82 (B) (3) a

• Ranges, wall-mounted ovens, counter-mounted cooking units (Tables 220.54 & 220.55)

220.82 (B) (3) b

• Clothes dryers not connected to the laundry branch circuit

220.82 (B) (3) c

• Water heaters

220.82 (B) (3) d

• Permanently connected motors not included in Heat & Air-Conditioning Load section

220.82 (B) (4)

HEATING & AIR-CONDITIONING LOADS

220.82 (C )

Include the

largest

of the following six selections (kVA load) in calculation

Air Conditioning and Cooling

220.82 (C) (1)

• 100% of nameplate rating

Heat Pumps Without Supplemental Electric Heating

220.82 (C) (2)

• 100% of nameplate rating

Heat Pumps With Supplemental Electric Heating

220.82 (C) (3)

• 100% of nameplate rating of the heat pump compressor*
• 65% of nameplate rating of supplemental electric heating equipment

- If compressor & supplemental heat cannot run at the same time

do not include the compressor

Electric Space Heating

• Less than 4 separately controlled units@ 65% of nameplate rating

220.82 (C) (4)

• 4 or more separately controlled units @ 40% of nameplate rating

220.82 (C) (5)

• 40% of nameplate rating if 4 or more separately controlled units

Electric Thermal Storage (or system where the load is expected to be

220.82 (C) (6)

continuous at nameplate rating

• 100% of nameplate rating
• Systems of this type cannot be calculated under any other section of 220.82 (C).

LOAD CALCULATIONS

General Lighting Load

3VAxft

• Small Appliance & Laundry Circuits

+ 1500 VA per circuit

• General Appliances & Motors (1 00% rated load)

+ Total general appliances

• Sum of all General Loads

= Total General Load (VA)

APPLY DEMAND FACTORS

- First 10 kVA@ 100%

= 10,000 VA

- Remainder of General Loads @ 40%

(Total VA -10,000) x .40

= Calculated General Load (VA)

• HEAT I A-C LOAD@ 100%

Largest Heat or A-Q Load (VA)

= TOTAL CALCULATED LOAD

Converting VA TO kW (Single-phase applications with 1.0 power factor only) 1 kVA = 1 kW

Summary of Contents for 6261

Page 1: ...Sizing Guide Automatic Home Standby Generators ...

Page 2: ...electrical equipment comprising the load When analyzing the electrical load consult the manufacturer s nameplate on each major appliance or piece of equipment to determine its starting and running requirements in terms of watts amps and voltage When choosing the generator output for commercial or industrial applications select a rating that is approximately 20 to 25 higher than the peak load for e...

Page 3: ...apor Installation and Fuel Pipe Sizing LP Vapor 8 Table 6 LP Vapor LPV Tank Sizing and Table 7 Generator Fuel Consumption 9 UPS Generator Compatibility 10 Typical Generator Transfer Switch Combinations 11 12 NEC 700 701 702 Comparison 13 Electrical Formulas Weights and Measures 14 Selected Circuit Load Calculator 15 16 19 20 23 24 27 28 System Capacity Load Calculator 17 18 21 22 25 26 29 30 ...

Page 4: ... Ton 120 000 BTU 5 Hp x2 10 49 33 28 14 145 97 84 42 10 Ton 120 000 BTU 10 Hp 10 49 33 28 14 250 167 144 72 15 Ton 180 000 BTU 7 5 Hp x2 15 74 49 42 21 219 146 126 63 15 Ton 180 000 BTU 15 Hp 15 74 49 42 21 375 250 217 108 20 Ton 240 000 BTU 10 Hp x2 20 98 65 57 28 250 167 144 72 20 Ton 240 000 BTU 20 Hp 20 n a 65 57 28 500 333 289 144 25 Ton 300 000 BTU 25 25 n a 82 71 35 625 416 361 180 30 Ton 3...

Page 5: ... 5 n a 19 General lighting and receptacles per 1000 ft2 3 24 9 n a Blow dryer 1 25 10 4 n a Dishwasher 1 5 12 5 n a Microwave 1 8 3 n a Toasters 1 8 3 n a Home Entertainment Center 1 8 3 n a Computer 1 8 3 n a Kitchen 1 5 12 5 n a Laundry 1 5 12 5 n a Non Motor Load Reference Commercial Please refer to equipment data plate and or billing history for commercial details Always check data plate for a...

Page 6: ...nning Amps Maximum Surge Capability Size kW 240V 1Ø 208V 3Ø 240V 3Ø 480V 3Ø 240V 1Ø 208V 3Ø 240V 3Ø 480V 3Ø 25 113 87 75 n a 265 221 192 n a 35 146 121 105 52 225 210 182 87 45 188 156 135 68 321 269 233 112 70 292 243 210 105 550 471 408 201 100 417 347 300 150 738 452 426 261 130 542 451 390 195 1088 885 767 419 Note All nominal ratings based upon LP fuel Refer to specification sheet for NG rati...

Page 7: ... based on black pipe Table 4A Natural Gas 5 to 7 of Water Column Table values are maximum pipe run in feet Table 4B Natural Gas 3 5 to 5 of Water Column Table values are maximum pipe run in feet BTU and Pressure Decal Flex Fuel Line Safety Shut Off with Pressure Port For Underground Installations Verify Piping System for Code Compliance Size Meter for Generator Load Plus ALL Appliances Check Dista...

Page 8: ... Check Distance with Regulator Manufacturer Primary Regulator Per LP Provider Flex Fuel Line Size gas pipe from secondary regulator with Generator Sizing Guide or to local codes Safety Shut Off with Pressure Port Secondary Regulator Vented 5 from Generator High Pressure Pipe Sized per LP Provider Size Tank Large Enough to Provide Required BTU s for Generator and ALL Connected Appliance Loads Be Su...

Page 9: ... Required for Common Appliances Appliance Approximate Input BTU Hr Warm Air Furnace Single Family Multifamily per unit 60 000 120 000 40 000 60 000 Hydronic Boiler Space Heating Single Family Multifamily per unit 80 000 140 000 50 000 80 000 Hydronic Boiler Space and Water Heating Single Family Multifamily per unit 100 000 200 000 50 000 100 000 Range Free Standing Domestic Built In Oven or Broile...

Page 10: ...ble conversion UPS s constantly rectify AC to DC and then invert the DC back into AC This configuration results in an output that corrects for voltage and frequency deviations There are single and three phase models covering small through large applications Most UPS applications larger than 5000 VA use double conversion technology This approach is also the preferred technology for generator applic...

Page 11: ...ircuit Pre wired Transfer Switch RTSV100A3 100 amp Normal Sync Smart Switch RTSG100A3 100 amp Service Rated Sync Smart Switch RTSG150A3 150 amp Service Rated Sync Smart Switch RTSV200A3 200 amp Normal Sync Smart Switch RTSG200A3 200 amp Service Rated Sync Smart Switch RTSE100A3CSAH 100 amp CSA Service Rated Switch RTSE200A3CSAH 200 amp CSA Service Rated Switch 6262 20 kW Air Cooled Generator Alumi...

Page 12: ...e Rated Switch HT04554ANAX 45 kW Liquid Cooled Generator Aluminum RTSG100A3 100 amp Normal Sync Smart Switch RTSL100A3 100 amp Service Rated Sync Smart Switch RTSG200A3 200 amp Normal Sync Smart Switch RTSL200A3 200 amp Service Rated Sync Smart Switch RTSE100A3CSAH 100 amp CSA Service Rated Switch RTSE200A3CSAH 200 amp CSA Service Rated Switch RTSV400A3 400 amp Normal Sync Smart Switch RTSG400A3 4...

Page 13: ... No NFPA 110 Signaling Yes Optional annunciator Yes Optional annunciator No Signs At service Yes Type location Yes Type location Yes Type location At neutral to ground bonding Yes if remote Yes if remote Yes if remote Wiring kept independent Yes No No Fire protection ref 700 9d Yes 1000 persons or 75 building No No Maximum power outage 10 sec 60 sec N A Retransfer delay 15 min setting 15 min setti...

Page 14: ...14 ...

Page 15: ...7 5 starting kW HP x 3 Starting kW for HP 7 5 starting kW HP x 2 Starting kW for loading with no listed HP calculate HP based on running amps in the chart on the right TABLE 9 Motor Load Table refer to Table 1 Device Amps kW Recommended Generator Size ________ Refer to Generator Sizing Instructions on other side of this sheet INSTALL NOTES 1 Suggested concrete pad minimum thickness of 4 with 6 ove...

Page 16: ...UPS load compatibility Peak Demand _______ Load Summation Method 1 Enter running kW for all motor loads except the largest expected to run during peak load levels into table 6 Refer to table 1 for typical motor load sizes and electrical require ments 2 Enter kW for all non motor loads expected to run during peak load levels into table 7 Refer to table 2 for typical residential loads and rules of t...

Page 17: ...ITIONING LOADS 220 82 C Include the largest of the following six selections kVA load in calculation Air Conditioning and Cooling 220 82 C 1 100 of nameplate rating Heat Pumps Without Supplemental Electric Heating 220 82 C 2 100 of nameplate rating Heat Pumps With Supplemental Electric Heating 220 82 C 3 100 of nameplate rating of the heat pump compressor 65 of nameplate rating of supplemental elec...

Page 18: ... for multiple cooking appliances 100 Wall Mounted Oven 100 Counter Mounted Cooking Surface 100 Water Heater 100 Clothes Dryer 100 Garage Door Opener 100 Septic Grinder 100 Other list 100 100 100 100 100 100 100 100 100 100 Total General Loads VA kW HEAT A C LOAD A C Cooling Equipment 100 Heat Pump Compressor if not included as A C 100 Supplemental Electric Heat 65 Electric Space Heating Less than ...

Page 19: ...7 5 starting kW HP x 3 Starting kW for HP 7 5 starting kW HP x 2 Starting kW for loading with no listed HP calculate HP based on running amps in the chart on the right TABLE 9 Motor Load Table refer to Table 1 Device Amps kW Recommended Generator Size ________ Refer to Generator Sizing Instructions on other side of this sheet INSTALL NOTES 1 Suggested concrete pad minimum thickness of 4 with 6 ove...

Page 20: ...UPS load compatibility Peak Demand _______ Load Summation Method 1 Enter running kW for all motor loads except the largest expected to run during peak load levels into table 6 Refer to table 1 for typical motor load sizes and electrical require ments 2 Enter kW for all non motor loads expected to run during peak load levels into table 7 Refer to table 2 for typical residential loads and rules of t...

Page 21: ...ITIONING LOADS 220 82 C Include the largest of the following six selections kVA load in calculation Air Conditioning and Cooling 220 82 C 1 100 of nameplate rating Heat Pumps Without Supplemental Electric Heating 220 82 C 2 100 of nameplate rating Heat Pumps With Supplemental Electric Heating 220 82 C 3 100 of nameplate rating of the heat pump compressor 65 of nameplate rating of supplemental elec...

Page 22: ... for multiple cooking appliances 100 Wall Mounted Oven 100 Counter Mounted Cooking Surface 100 Water Heater 100 Clothes Dryer 100 Garage Door Opener 100 Septic Grinder 100 Other list 100 100 100 100 100 100 100 100 100 100 Total General Loads VA kW HEAT A C LOAD A C Cooling Equipment 100 Heat Pump Compressor if not included as A C 100 Supplemental Electric Heat 65 Electric Space Heating Less than ...

Page 23: ...7 5 starting kW HP x 3 Starting kW for HP 7 5 starting kW HP x 2 Starting kW for loading with no listed HP calculate HP based on running amps in the chart on the right TABLE 9 Motor Load Table refer to Table 1 Device Amps kW Recommended Generator Size ________ Refer to Generator Sizing Instructions on other side of this sheet INSTALL NOTES 1 Suggested concrete pad minimum thickness of 4 with 6 ove...

Page 24: ...UPS load compatibility Peak Demand _______ Load Summation Method 1 Enter running kW for all motor loads except the largest expected to run during peak load levels into table 6 Refer to table 1 for typical motor load sizes and electrical require ments 2 Enter kW for all non motor loads expected to run during peak load levels into table 7 Refer to table 2 for typical residential loads and rules of t...

Page 25: ...ITIONING LOADS 220 82 C Include the largest of the following six selections kVA load in calculation Air Conditioning and Cooling 220 82 C 1 100 of nameplate rating Heat Pumps Without Supplemental Electric Heating 220 82 C 2 100 of nameplate rating Heat Pumps With Supplemental Electric Heating 220 82 C 3 100 of nameplate rating of the heat pump compressor 65 of nameplate rating of supplemental elec...

Page 26: ... for multiple cooking appliances 100 Wall Mounted Oven 100 Counter Mounted Cooking Surface 100 Water Heater 100 Clothes Dryer 100 Garage Door Opener 100 Septic Grinder 100 Other list 100 100 100 100 100 100 100 100 100 100 Total General Loads VA kW HEAT A C LOAD A C Cooling Equipment 100 Heat Pump Compressor if not included as A C 100 Supplemental Electric Heat 65 Electric Space Heating Less than ...

Page 27: ...7 5 starting kW HP x 3 Starting kW for HP 7 5 starting kW HP x 2 Starting kW for loading with no listed HP calculate HP based on running amps in the chart on the right TABLE 9 Motor Load Table refer to Table 1 Device Amps kW Recommended Generator Size ________ Refer to Generator Sizing Instructions on other side of this sheet INSTALL NOTES 1 Suggested concrete pad minimum thickness of 4 with 6 ove...

Page 28: ...UPS load compatibility Peak Demand _______ Load Summation Method 1 Enter running kW for all motor loads except the largest expected to run during peak load levels into table 6 Refer to table 1 for typical motor load sizes and electrical require ments 2 Enter kW for all non motor loads expected to run during peak load levels into table 7 Refer to table 2 for typical residential loads and rules of t...

Page 29: ...ITIONING LOADS 220 82 C Include the largest of the following six selections kVA load in calculation Air Conditioning and Cooling 220 82 C 1 100 of nameplate rating Heat Pumps Without Supplemental Electric Heating 220 82 C 2 100 of nameplate rating Heat Pumps With Supplemental Electric Heating 220 82 C 3 100 of nameplate rating of the heat pump compressor 65 of nameplate rating of supplemental elec...

Page 30: ... for multiple cooking appliances 100 Wall Mounted Oven 100 Counter Mounted Cooking Surface 100 Water Heater 100 Clothes Dryer 100 Garage Door Opener 100 Septic Grinder 100 Other list 100 100 100 100 100 100 100 100 100 100 Total General Loads VA kW HEAT A C LOAD A C Cooling Equipment 100 Heat Pump Compressor if not included as A C 100 Supplemental Electric Heat 65 Electric Space Heating Less than ...

Page 31: ...31 Notes ...

Page 32: ...3187 1 855 GEN INFO 436 4636 www honeywellgenerators com 0194900HWL Revised July 2013 Generac Power Systems Inc All rights reserved Specifications subject to change without notice The Honeywell Trademark is used under license from Honeywell International Inc ...

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