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Diagram and Table:
1. Find fault current value Fo from the TEP table. Short feeder lengths are noted on the oneline diagram; others must be measured. Calculate fault currents F1, F2, F3, F4, and Fs. TUCSON ELECTRIC POWER PAD MOUNTED TRANSFORMER. LOCATION PER SITE PLAN. NOTES 1. ALL FEEDERS ARE ASSUMED TO BE IN METALLIC CONDUIT UNLESS OTHERWISE NOTED. 2. SHORT FEEDERS LENGTHS AS NOTED. OTHERS MUST BE MEASURED ON THE SITE PLAN. FO = v k UNDERGROUND SERVICE FEEDER (3) SETS 3-600MCM. 600MCM NEUTRAL, THW CU, IN NON MAGNETIC CONDUIT NEW 12001, 480/27/1.3PH 4W SERVICE ENTRANCE SWITCHBOARD, NEMA 3R, BRACED FOR MIN. A FAULT CURRENT. LOCATED IN ASIA PAVILION BUILDING. F1 = 32 1200A _A 23 GROUNDING- ELECTRODE CONDUCTOR 480/227V FEEDER TO REPTILE BLDG LIGHING PANEL UNDERGROUND IN NON-METALLIC CONDUIT OTHER LOADS OTHER LOADS OTHER LOADS OTHER LOADS IRED PANDAS) (TIGERS) ISLOTH BEARS) (OH MY 480/2777 FEEDER TO PUMP STATON UNDERGROUND IN NON METALLIC CONDUT 12=** PANEL 480/277V REPTILE THREE PHASE BUILDING FOUR-WIRE 480 PANEL URO GRUS 480/277V FEEDER TO REPTILE BUILDING STEPDOWN TRANSFORMER, 10 LONG F3 = 3 X WW 45kVA 3-PHASE 480-208/120V MTRANSFORMER F4=** AT REPTILE BUILDING O FEEDER TOPUMP STATON PANEL 10 LONG 208/120V FEEDER TO REPTILE BUILDING RECEPTACLE PANEL 10 LONG PANEL 480/277V SHODOV THREE PHASE FOUR WRE PANEL LOCATED IN PUMP STATION VAULT PUMP STATION 5 = 2X PANEL 208/120V THREE PHASE REPTILE FOUR-WIRE PANEL BUILDING LOCATED IN THE REPTILE BLDG. TEL TABLE 1 - AVAILABLE FAULT CURRENT BASED ON SIZE OF SERVICE ENTRANCE SERVICE ENTRANCE EQUIPMENT CAPACITY (AMPS) ASSUMED LOADING (AMPS) (80%) 200 160 400 320 480 600 800 640 MAXIMUM 3 FAULT CURRENT IN SYMMETRICAL AMPERES FOR SERVICE VOLTAGE LISTED 120/208V 120/240V 277/480V POLE TYPE PAD-MOUNT POLE TYPE POLE TYPE PAD-MOUNT TRANSFORMER TRANSFORMER TRANSFORMER TRANSFORMER TRANSFORMER 13,900 13,900 12,100 12,100 12,100 20,900 27,800 18,100 24,100 24,100 27,800 55,600 31,900 35,500 32,600 36,800 55,600 42,500 35,500 32,600 49,100 55,600 42,500 32,600 77,400 75,100 67,00 32,600 77,400 75,100 32,600 75,100 32,600 75,100 52,300 75,100 52,300 52,300 1000 800 1200 960 1600 1280 2000 1600 2500 2000 3000 2400 4000 3200 1. Find fault current value Fo from the TEP table. Short feeder lengths are noted on the oneline diagram; others must be measured. Calculate fault currents F1, F2, F3, F4, and Fs. TUCSON ELECTRIC POWER PAD MOUNTED TRANSFORMER. LOCATION PER SITE PLAN. NOTES 1. ALL FEEDERS ARE ASSUMED TO BE IN METALLIC CONDUIT UNLESS OTHERWISE NOTED. 2. SHORT FEEDERS LENGTHS AS NOTED. OTHERS MUST BE MEASURED ON THE SITE PLAN. FO = v k UNDERGROUND SERVICE FEEDER (3) SETS 3-600MCM. 600MCM NEUTRAL, THW CU, IN NON MAGNETIC CONDUIT NEW 12001, 480/27/1.3PH 4W SERVICE ENTRANCE SWITCHBOARD, NEMA 3R, BRACED FOR MIN. A FAULT CURRENT. LOCATED IN ASIA PAVILION BUILDING. F1 = 32 1200A _A 23 GROUNDING- ELECTRODE CONDUCTOR 480/227V FEEDER TO REPTILE BLDG LIGHING PANEL UNDERGROUND IN NON-METALLIC CONDUIT OTHER LOADS OTHER LOADS OTHER LOADS OTHER LOADS IRED PANDAS) (TIGERS) ISLOTH BEARS) (OH MY 480/2777 FEEDER TO PUMP STATON UNDERGROUND IN NON METALLIC CONDUT 12=** PANEL 480/277V REPTILE THREE PHASE BUILDING FOUR-WIRE 480 PANEL URO GRUS 480/277V FEEDER TO REPTILE BUILDING STEPDOWN TRANSFORMER, 10 LONG F3 = 3 X WW 45kVA 3-PHASE 480-208/120V MTRANSFORMER F4=** AT REPTILE BUILDING O FEEDER TOPUMP STATON PANEL 10 LONG 208/120V FEEDER TO REPTILE BUILDING RECEPTACLE PANEL 10 LONG PANEL 480/277V SHODOV THREE PHASE FOUR WRE PANEL LOCATED IN PUMP STATION VAULT PUMP STATION 5 = 2X PANEL 208/120V THREE PHASE REPTILE FOUR-WIRE PANEL BUILDING LOCATED IN THE REPTILE BLDG. TEL TABLE 1 - AVAILABLE FAULT CURRENT BASED ON SIZE OF SERVICE ENTRANCE SERVICE ENTRANCE EQUIPMENT CAPACITY (AMPS) ASSUMED LOADING (AMPS) (80%) 200 160 400 320 480 600 800 640 MAXIMUM 3 FAULT CURRENT IN SYMMETRICAL AMPERES FOR SERVICE VOLTAGE LISTED 120/208V 120/240V 277/480V POLE TYPE PAD-MOUNT POLE TYPE POLE TYPE PAD-MOUNT TRANSFORMER TRANSFORMER TRANSFORMER TRANSFORMER TRANSFORMER 13,900 13,900 12,100 12,100 12,100 20,900 27,800 18,100 24,100 24,100 27,800 55,600 31,900 35,500 32,600 36,800 55,600 42,500 35,500 32,600 49,100 55,600 42,500 32,600 77,400 75,100 67,00 32,600 77,400 75,100 32,600 75,100 32,600 75,100 52,300 75,100 52,300 52,300 1000 800 1200 960 1600 1280 2000 1600 2500 2000 3000 2400 4000 3200
