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Generator Sizing Guide Technical Data TD00405018E Effective August 2009 Content

Generator Sizing Guide Technical Data TD00405018E Effective August 2009 Contents Description Page Table 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 Onsite Estimating Sheet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 System Capacity – Load Calculator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Worksheet — NEC 2008, 220 Part IV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Typical Generator/Transfer Switch Combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 NEC (700, 701, 702) Comparison.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Electrical Formulas.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Weights and Measures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2 Technical Data TD00405018E Effective August 2009 Generator Sizing Guide EATON CORPORATION www.eaton.com Important Notice: This booklet is designed to familiarize estimators and installers with proper sizing guidelines for residential and commercial generators. The information is not comprehensive, nor does it replace or supercede 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 equipment. How To Use This Booklet: Within 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. The worksheet pages can be removed from the book and photocopied to create additional Onsite Estimating Sheets for use with individual jobs. Safety Information: Proper 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. 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 future. For 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 regulations. It is essential to comply with all regulations established by the Occupational Safety & Health Administration (OSHA) 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 emissions. If you have a technical question regarding sizing or installation, contact Eaton’s Technical Service Center toll free at 1-800-975-8331 during normal business hours (8 a.m. to 4 p.m. CST). 3 Technical Data TD00405018E Effective August 2009 Generator Sizing Guide EATON CORPORATION www.eaton.com T able 1. Motor Load Reference AC & Heat Pumps Running Load Starting Load Description Hp Running kW Amps @ 240V 1Ø Amps @ 208V 3Ø Amps @ 240V 3Ø Amps @ 480V 3Ø LR Amps @ 240V 1Ø LR Amps @ 208V 3Ø LR Amps @ 240V 3Ø LR Amps @ 480V 3Ø kW 1 Ton (12,000 BTU) 1 1 5 3 3 1 33 22 19 10 2.5 2 Ton (24,000 BTU) 2 2 10 7 6 3 67 44 38 19 5 3 Ton (36,000 BTU) 3 3 15 10 8 4 100 67 58 29 7.5 4 Ton (48,000 BTU) 4 4 20 13 11 6 117 78 67 34 10 5 Ton (60,000 BTU) 5 5 25 16 14 7 145 97 84 42 12.5 7.5 Ton (85,000 BTU) 7.5 7.5 37 24 21 11 219 146 126 63 17 10 Ton* (120,000 BTU) 5 (x2) 10 49 33 28 14 145 97 84 42 12.5 10 Ton (120,000 BTU) 10 10 49 33 28 14 250 167 144 72 20 15 Ton* (180,000 BTU) 7.5 (x2) 15 74 49 42 21 219 146 126 63 17 15 Ton (180,000 BTU) 15 15 74 49 42 21 375 250 217 108 30 20 Ton* (240,000 BTU) 10 (x2) 20 98 65 57 28 250 167 144 72 20 20 Ton (240,000 BTU) 20 20 N/A 65 uploads/s1/ generator-sizing-guide.pdf