Generator sizing guide - Electrical and Industrial …

1 Technical Data TD00405018 EEffective April 2017 Supersedes August 2009 ContentsDescription PageTable 1. Motor load reference ..3 Table 2. Non-motor load reference ..4 Table 3. Surge capability ..5 Table 4. Fuel pipe sizing ..6 Table 5. LP vapor (LPV) tank sizing ..7 UPS Generator compatibility ..8 Table 6. Online estimating sheet ..9On-site estimating sheet ..10 Typical single-phase Generator /transfer switch combinations ..11 NEC (700, 701, 702) comparison ..12 Electrical formulas ..13 Weights and measures ..14 Generator sizing guide2 Technical Data TD00405018 EEffective April 2017 Generator sizing guide eaton noticeThis booklet is designed to familiarize estimators and installers with proper sizing guidelines for residential and commercial generators .

2 The information is not comprehensive, nor does it replace or supersede any material contained in any of the written documents shipped with the equipment. This booklet should only be used in conjunction with the Owner s Manual, Installation Manual, and other technical documents shipped with each product. Always read all accompanying documentation carefully before attempting to install any Generator , transfer switch, or related to use this bookletWithin this booklet, you will find Electrical load information, plus an outline of Generator surge capability, fuel pipe sizing , liquid propane tank sizing , and UPS/ Generator compatibility.

3 The worksheet pages can be removed from the book and photocopied to create additional On-site Estimating Sheets for use with individual jobs. Safety informationProper sizing of the Generator is crucial to the success of any installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the 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.

4 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 example, if the load is about 40 kilowatts, select a 50 kW genset). A higher rated Generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the safety reasons, eaton recommends that the backup power system be installed, serviced, and repaired by an eaton Authorized Service Dealer or a competent, qualified electrician or installation technician who is familiar with applicable codes, standards, and is essential to comply with all regulations established by the Occupational Safety & Health Administration (OSHA)

5 And strict adherence to all local, state, and national codes is mandatory. Before selecting a Generator , check for municipal ordinances that may dictate requirements regarding placement of the unit (setback from building and/or lot line), Electrical wiring, gas piping, fuel storage (for liquid propane or diesel tanks), sound and exhaust you have a technical question regarding sizing or installation, contact EatonCare s Technical Resource Center toll free at 1-877-386-2273, option 2 during normal business hours (8 to 4 CST).3 Technical Data TD00405018 EEffective April 2017 Generator sizing guide eaton 1.

6 Motor load referenceac and heat pumpsRunning loadStarting loadDescriptionhpRunning kWSingle-phaseThree-phaseSingle-phaseThr ee-phasekWAmps at 240 VAmps at 208 VAmps at 240 VAmps at 480 VLR amps at 240 VLR amps at 208 VLR amps at 240 VLR amps at 480 V1 ton (12,000 BTU) ton (24,000 BTU)22107636744381953 ton (36,000 BTU)331510841006758297. 54 ton (48,000 BTU)442013116117786734105 ton (60,000 BTU) ton (85,000 BTU)7. 57. 537242111219146126631710 ton (120,000 BTU) a5 (x2) ton (120,000 BTU)10104933281425016714 4722015 ton (180,000 BTU) a7. 5 ( x 2 )1574494221219146126631715 ton (180,000 BTU)1515744942213752502171083020 ton (240,000 BTU) a10 (x2)209865572825016714 4722020 ton (240,000 BTU)2020N/A65572850033328914 44025 ton (300,000 BTU)2525N/A8271356254163611805030 ton (360,000 BTU) a15 (x 2)30N/A9885423752502171083030 ton (360,000 BTU)3030N/A9885427505004332176040 ton (480,000 BTU) a20 (x2)40N/A1311135750033328914 44040 ton (480,000 BTU)4040N/A1311135710006665772898050 ton (480,000 BTU) a25 (x2)50N/A163142716254163611805050 ton (480,000 BTU)

7 5050N/A163142711250833722361100 General residentialDescriptionhpRunning kWSingle-phaseSingle-phasekWAmps at 120 amps at 240 VLR amps at 240 VLR amps at 120 VRefrigerator pump, sump, furnace, garage , washer, septic 1 and septic lift For multiple motor configurations, sequence starting is CAUTIONDO NOT SIZE THE Generator BASED ON STARTING KW MUST COMPARE LR AMPS TO Generator SURGE CAPABILITY (TABLE 3). SIZE THE Generator BY FOLLOWING THE sizing Data TD00405018 EEffective April 2017 Generator sizing guide eaton 2. Non-motor load referenceResidentialDescriptionRunning load aRunning kWSingle-phaseAmps at 120 VAmps at 240 VElectric heat per 1000 ft212N/A50 Heat pump elements per 1000 ft27 tub10N/A50 Range oven/stove top per burner8N/A30 Hot lighting and receptacles per 1000 entertainment refer to equipment data plate and/or billing history for commercial Always check data plate for actual running Data TD00405018 EEffective April 2017 Generator sizing guide eaton 3.

8 Surge capabilityGenerators (operating at less than 3600 RPM)Size (kW)Rated output (running amps)Commercial (LR amps at 15% voltage dip)Residential (LR amps at 30% voltage dip)Single-phaseThree-phaseSingle-phaseT hree-phaseSingle-phaseThree-phase240 V208 V240 V480 V240 V208 V240 V480 V240 V208 V240 V480 V229276N/AN/A7148N/AN/A13492N/AN/A251048 7753871484630138929159271139481411006758 3315 3137118643012510490451006765432051371308 7351461211055211375604322515011887361501 2510854113756544225151131874016713912060 1298675492541691479745188156135681469894 572921951681124820016714 4721631099457321214185112702922432101052 7516415995550330318190803332782401202751 8315910655036631821210041734730015036922 22141287384

9 4142625513054245139019554636431520910887 24628419 generators (operating at 3600 RPM)729N/AN/AN/A23N/AN/AN/A46N/AN/AN/A83 3N/AN/AN/A26N/AN/AN/A51N/AN/AN/A1042N/AN /AN/A31N/AN/AN/A63N/AN/AN/A1354N/AN/AN/A 48N/AN/AN/A95N/AN/AN/A1458N/AN/AN/A52N/A N/AN/A102N/AN/AN/A1667N/AN/AN/A59N/AN/AN /A117N/AN/AN/A1771N/AN/AN/A63N/AN/AN/A12 5N/AN/AN/A1875N/AN/AN/A67N/AN/AN/A133N/A N/AN/A2083N/AN/AN/A73N/AN/AN/A145N/AN/AN /A25104877538714846301389291603012510490 4510067604320513713087351461211055211375 6043225150118874518815613568146989457292 1951681126025020818090179120103693502342 0413670292243210105275164142955503302861 908033327824012027518315

10 8106550366318212100417347300150369222214 1287384 4142625515062552045122655837232221511217 47647431otee:NAll nominal ratings based upon LP fuel. Refer to specification sheet for NG ratings and deration adjustments for ambient temperature and Data TD00405018 EEffective April 2017 Generator sizing guide eaton 4. Fuel pipe sizingNatural gas (values are maximum pipe run in ft)kWPipe size (in inches) 85520082010208537080013 14105024554516 1740190425202013030594522151152607992510 952207392785203552306014756535 3635953709154025753157904515602606504850 23058550502205606025145390118 5705752257108065195630100401404601305021 515030150LP vapor (values are maximum pipe run in ft)kWPipe size (in inches)