The generator should not be placed under a deck or other structure that is closed in and would limit or constrain air flow. Clearance at the top should be a minimum of 60 in (1524 mm) from any structure, overhang or projections from the wall. This would include shrubs, bushes or trees. 36 in (914 mm) Clearance from the ends and front of the generator must be 36 in (914 mm).
Local codes may be different and more restrictive than what is described here. These guidelines are based upon fire testing of the generator enclosure and the manufacturer s requirement for air flow for proper operation. 60 in (1524 mm) Existing Wall 18 in (457 mm) 60 in (1524 mm) Minimum Distance 36 in (914 mm) Top of Generator 36 in (914 mm) Clearance from operable windows, doors or any openings in the wall. 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.ģ Siemens Generator Sizing Guide Table of Contents Placement Diagram Air-Cooled Generators.4 Table 1 Motor Load Reference.5 Table 2 Non-Motor Load Reference.6 Table 3 Surge Capability Table 4 Fuel Pipe Sizing Table 5 LP Vapor (LPV) Tank Sizing.11 UPS Generator Compatibility Typical Generator/Transfer Switch Combinations NEC 700, 701, 702 Comparison Electrical Formulas, Weights and Measures.16 Onsite Estimating Sheet.17, 18, 21, 22, 25, 26, 29, 30 System Capacity Load Calculator.19, 20, 23, 24, 27, 28, 31, 32 3Ĥ Siemens Generator Sizing Guide Placement Diagram Air Cooled Generators No operable windows or openings in the wall permitted within 5 ft (1.52 m) from any point of the generator.
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. For safety reasons, Siemens recommends that the backup power system be installed, serviced and repaired by a Siemens Authorized Service Dealer or a competent, qualified electrician or installation technician who is familiar with applicable codes, standards and regulations. 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. 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). 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. 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. The worksheet pages can be removed from the book and photocopied to create additional Onsite Estimating Sheets for use with individual jobs.
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.
Always read all accompanying documentation carefully before attempting to install any generator, transfer switch or related equipment.
This booklet should only be used in conjunction with the Owner s Manual, Installation Manual and other technical documents shipped with each product. The information is not comprehensive, nor does it replace or supercede any material contained in any of the written documents shipped with the equipment. 1 Generator Sizing Guide Residential and commercial /generatorsĢ Important Notice: This booklet is designed to familiarize estimators and installers with proper sizing guidelines for residential and commercial generators.