Section C R31.pdf

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The Electrical Handbook Fuse Selection Charts adjustthis nameplate data so that all that is necessary for standardcompressor short circuit time delay fuse protectionsizing is to answer the Selection Chart questions, determinea multiplier for RLA, and size the compressor fuseaccordingly.FUSE SELECTION PROCEDURE CHART FORWELDED COMPRESSORS AND COPELAND SCROLLCOMPRESSORS1. Determine Rated Load Amps (RLA) from nameplateor Section F.2. Determine Locked Rotor Amps (LRA) from nameplateor Section F.3. Divide LRA/RLA for Inrush Ratio.4. If fuse ambient temperature is greater than 120°F,multiply Inrush Ratio by 1.08.5. For Single Phase compressors, multiply RLA by:1.6 if Inrush Ratio is 5 or less, or1.7 if Inrush Ratio is more than 5.6. For Three Phase compressors, multiply RLA by:1.5 if Inrush Ratio is 4 or less, or1.6 if Inrush Ratio is more than 4.7. Use the next higher Time Delay fuse rating abovethe adjusted RLA value calculated in step 5 or step6.NOTE: IN NO CASE MAY FUSE RATING EXCEED225% OF COMPRESSOR RLA!C2Section C.indd 22/5/2008 8:01:07 AM
FUSE SELECTION PROCEDURE CHART FORCOPELAMETIC COMPRESSORS1. Determine Rated Load Amps (RLA) from nameplateor Section F.2. Determine Locked Rotor Amps(LRA) from nameplateor Section F.3. Divide LRA/RLA for Inrush Ratio.4. If fuse ambient temperature is greater than 120°F,multiply Inrush Ratio by 1.08.5. For Single Phase compressors, multiply RLA by:1.5 if Inrush Ratio is 5 or less, or1.6 if Inrush Ratio is more than 5.6. For Three Phase compressors, multiply RLA by:1.4 if Inrush Ratio is 4 or less, or1.5 if Inrush Ratio is more than 4.7. Use the next higher Time Delay fuse rating above theadjusted RLA value calculated in step 5 or step 6.NOTE: IN NO CASE MAY FUSE RATING EXCEED225% OF COMPRESSOR RLA!C3Section C.indd 32/5/2008 8:01:07 AM
Page 1: SECTION CFUSE SELECTION FOR WELDED

Section C R31.pdf

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