Compressed Air Best Practices - January 2009 - (Page 31) Focu Indu try EN Focus Industry ENERGY REBATES ocus u ENER Y REBA S EB | 01/09 | Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives BY MARK BEATTY, DESIGN ENGINEER, GARDNER DENVER INC. Safety is the driving force in the determination of minimum recommended supply wire sizes for variable speed compressor packages. With this in mind, all wire size recommendations should be based on meeting, or exceeding, the minimum requirements of the National Electrical Code (NEC). In determining the proper minimum wire size recommendation, NEC 430.122 lists the preliminary requirement to obtain the drive rated input ampacity which is listed on the drive data label, and in the appropriate drive manual. All drive input amps are added together, as applicable. Add the ancillary load amps from coils, controller, power supply and other ancillary loads to the drive input amps. Then multiply this sum by 1.25 to obtain package amperage which can be used for wire sizing, at 30 ºC ambient, per NEC Table 310.16. Please note that the 1.25 multiplier to the drive input amperage is required per NEC 430.122. Adding the ancillary load amperage total to the drive input amperage, prior to performing the 1.25 multiplier calculation, serves to add a small amount of increased safety factor for wire sizing. An example of this procedure is demonstrated as follows: p p p For a 460V, 40 kW compressor, the drive input amps are listed as 90A The remaining ancillary loads total 10 90A + 10A = 100A x 1.25 = 125A at 30 ºC ambient (Package Amps) www.airbestpractices.com 31 http://www.airbestpractices.com
Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - January 2009 Compressed Air Best Practices - January 2009 Contents From the Editor Utility-Air News Compressed Air Audit of the Month: A Nitrogen Audit at Boeing Air Standards: New ASME & ISO Standards for Compressed Air System Assessments Energy Rebates Assist Industrial Sustainability Initiatives Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives The Pneumatic Advantage: Pneumatics Bring Precision and Reliability to Furniture Industry Specialist Personal Productivity: Is Afternoon Fatigue Influencing Your Job Performance? The Explanation and Some Solutions. Resources for Energy Engineers: Training Calendar & Product Picks Wall Street Watch Advertiser Index Classifieds Compressed Air Best Practices - January 2009 Compressed Air Best Practices - January 2009 - Compressed Air Best Practices - January 2009 (Page Cover1) Compressed Air Best Practices - January 2009 - Compressed Air Best Practices - January 2009 (Page Cover2) Compressed Air Best Practices - January 2009 - Compressed Air Best Practices - January 2009 (Page 3) Compressed Air Best Practices - January 2009 - Contents (Page 4) Compressed Air Best Practices - January 2009 - Contents (Page 5) Compressed Air Best Practices - January 2009 - From the Editor (Page 6) Compressed Air Best Practices - January 2009 - Utility-Air News (Page 7) Compressed Air Best Practices - January 2009 - Utility-Air News (Page 8) Compressed Air Best Practices - January 2009 - Utility-Air News (Page 9) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 10) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 11) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 12) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 13) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 14) Compressed Air Best Practices - January 2009 - Compressed Air Audit of the Month: A Nitrogen Audit at Boeing (Page 15) Compressed Air Best Practices - January 2009 - Air Standards: New ASME & ISO Standards for Compressed Air System Assessments (Page 16) Compressed Air Best Practices - January 2009 - Air Standards: New ASME & ISO Standards for Compressed Air System Assessments (Page 17) Compressed Air Best Practices - January 2009 - Air Standards: New ASME & ISO Standards for Compressed Air System Assessments (Page 18) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 19) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 20) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 21) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 22) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 23) Compressed Air Best Practices - January 2009 - Energy Rebates Assist Industrial Sustainability Initiatives (Page 24) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 25) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 26) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 27) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 28) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 29) Compressed Air Best Practices - January 2009 - Seven Sustainability Projects for Industrial Energy Savings: Project #1: Lighting Optimization (Page 30) Compressed Air Best Practices - January 2009 - Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives (Page 31) Compressed Air Best Practices - January 2009 - Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives (Page 32) Compressed Air Best Practices - January 2009 - Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives (Page 33) Compressed Air Best Practices - January 2009 - Minimum Supply Wire Size Recommendations for Compressor Packages Utilizing Variable Frequency Drives (Page 34) Compressed Air Best Practices - January 2009 - The Pneumatic Advantage: Pneumatics Bring Precision and Reliability to Furniture Industry Specialist (Page 35) Compressed Air Best Practices - January 2009 - The Pneumatic Advantage: Pneumatics Bring Precision and Reliability to Furniture Industry Specialist (Page 36) Compressed Air Best Practices - January 2009 - The Pneumatic Advantage: Pneumatics Bring Precision and Reliability to Furniture Industry Specialist (Page 37) Compressed Air Best Practices - January 2009 - Personal Productivity: Is Afternoon Fatigue Influencing Your Job Performance? The Explanation and Some Solutions. (Page 38) Compressed Air Best Practices - January 2009 - Personal Productivity: Is Afternoon Fatigue Influencing Your Job Performance? The Explanation and Some Solutions. (Page 39) Compressed Air Best Practices - January 2009 - Personal Productivity: Is Afternoon Fatigue Influencing Your Job Performance? The Explanation and Some Solutions. (Page 40) Compressed Air Best Practices - January 2009 - Resources for Energy Engineers: Training Calendar & Product Picks (Page 41) Compressed Air Best Practices - January 2009 - Resources for Energy Engineers: Training Calendar & Product Picks (Page 42) Compressed Air Best Practices - January 2009 - Resources for Energy Engineers: Training Calendar & Product Picks (Page 43) Compressed Air Best Practices - January 2009 - Wall Street Watch (Page 44) Compressed Air Best Practices - January 2009 - Wall Street Watch (Page 45) Compressed Air Best Practices - January 2009 - Wall Street Watch (Page 46) Compressed Air Best Practices - January 2009 - Wall Street Watch (Page 47) Compressed Air Best Practices - January 2009 - Wall Street Watch (Page 48) Compressed Air Best Practices - January 2009 - Advertiser Index (Page 49) Compressed Air Best Practices - January 2009 - Classifieds (Page 50) Compressed Air Best Practices - January 2009 - Classifieds (Page Cover3) Compressed Air Best Practices - January 2009 - Classifieds (Page Cover4)
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