Assessments - 1, GPA: 5
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Approximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running Watts Hand Drill 1/4 in 350 350 3/8 in 400 400 1/2 in 600 600 Circular Saw 6-1/2 in 500 500 7-1/4 in 900 900 8-1/4 in 1400 1400 Table Saw 9 in 4500 1500 10 in 6300 1800 Band Saw 14 in 2500 1100 Bench Grinder 6 in 1720 720 8 in 3900 1400 10 in 5200 1600 Air Compressor 1/2 HP 3000 1000 1 HP 6000 1500 1-1/2 HP 8200 2200 2 HP 10500 2800 Electric Chain Saw 1-1/2 HP, 12 in 1100 1100 2 HP, 14 in 1100 1100 Electric Trimmer Standard 9 in 350 350 Heavy Duty 12 in 500 500 Electric Cultivator 1/3 HP 2100 700 Elec. Hedge Trimmer 18 in 400 400 Flood Lights HID 125 100 Metal Halide 313 250 Mercury 1000 Sodium 1400 Vapor 1250 1000 Submersible Pump 400 gph 600 200 Centrifugal Pump 900 gph 900 500 Floor Polisher 3/4 HP, 16 in 4500 1400 1 HP, 20 in 6100 1600 High Pressure Washer 1/2 HP 3150 950 3/4 HP 4500 1400 1 HP 6100 1600 55 gal Drum Mixer 1/4 HP 1900 700 Wet & Dry Vac 1.7 HP 900 900 2-1/2 HP 1300 1300 OM-487 Page 44 10-8. Power Required To Start Motor VOLTS AMPS HP 230 2.5 1/4 Hz PHASE CODE 60 1 M AC MOTOR 1 Motor Start Code 4 2 2 Running Amperage 1 3 Motor HP3 4 Motor Voltage To find starting amperage: Step 1: Find code and use table to find kVA/HP. If code is not listed, multiply running amperage by six to find starting amperage. Step 2: Find Motor HP and Volts. Step 3: Determine starting amperage (see example). Welding generator amperage output must be at least twice the motor’s running amperage. Single-Phase Induction Motor Starting Requirements Motor Start Code G H J K L M N P KVA/HP 6.3 7.1 8.0 9.0 10.0 11.2 12.5 14.0 kVA/HP x HP x 1000 = STARTING AMPERAGE VOLTS EXAMPLE: Calculate the starting amperage required for a 230 V, 1/4 HP motor with a motor start code of M. Volts = 230 HP = 1/4 Using Table, Code M results in kVA/HP = 11.2 11.2 x 1/4 x 1000 = 12.2 A Starting the motor requires 12.2 amperes. 230 10-9. How Much Power Can Generator Supply? Ref. ST-800 396-A / S-0625 1 Limit Load To 90% Of Generator Output Always start non-resistive (motor) loads in order from largest to smallest, and add resistive loads last. 2 5 Second Rule If motor does not start within 5 seconds, turn off power to prevent motor damage. Motor requires more power than generator can supply. 1 2 OM-487 Page 45 10-10. Typical Connections To Supply Standby Power . Customer-supplied equipment is required if generator is to supply standby power during emergencies or power outages. 1 Load 4 7 5 120/240 Volt 60 Hz Three-Wire Service 240 V 120 V 120 V Neutral 240 V 120 V 120 V120/240 Volt Single-Phase Three-Wire Generator Output Connection Ground F1 or CB 240 V 120 V 120 V 2 3 6 1 Power Company Service Meter 2 Main and Branch Overcurrent Protection 3 Double-Pole, Double-Throw Transfer Switch Obtain and install correct switch. Switch rating must be same as or greater than the branch overcurrent protection. 4 Circuit Breakers or Fused Disconnect Switch Obtain and install correct switch. 5 Extension Cord Select as shown in Section 10-11. 6 Generator Connections Connect terminals or plug of adequate amperage capacity to cord. Follow all applicable codes and safety practices. Turn off or unplug all equipment connected to generator before starting or stopping engine. When starting or stopping, the engine has low speed which causes low voltage and frequency. 7 Load Connections Item 4 is not necessary if circuit protection is already present in welding generator auxiliary power output circuit. S-0405-A OM-487 Page 46 10-11. Selecting Extension Cord (Use Shortest Cord Possible) Cord Lengths for 120 Volt Loads . If unit does not have GFCI receptacles, use GFCI-protected extension cord. Current (Amperes) Load (Watts) Maximum Allowable Cord Length in ft (m) for Conductor Size (AWG)* 4 6 8 10 12 14 5 600 350 (106) 225 (68) 137 (42) 100 (30) 7 840 400 (122) 250 (76) 150 (46) 100 (30) 62 (19) 10 1200 400 (122) 275 (84) 175 (53) 112 (34) 62 (19) 50 (15) 15 1800 300 (91) 175 (53) 112 (34) 75 (23) 37 (11) 30 (9) 20 2400 225 (68) 137 (42) 87 (26) 50 (15) 30 (9) 25 3000 175 (53) 112 (34) 62 (19) 37 (11) 30 3600 150 (46) 87 (26) 50 (15) 37 (11) 35 4200 125 (38) 75 (23) 50 (15) 40 4800 112 (34) 62 (19) 37 (11) 45 5400 100 (30) 62 (19) 50 6000 87 (26) 50 (15) *Conductor size is based on maximum 2% voltage drop Cord Lengths for 240 Volt Loads . If unit does not have GFCI receptacles, use GFCI-protected extension cord. Current (Amperes) Load (Watts) Maximum Allowable Cord Length in ft (m) for Conductor Size (AWG)* 4 6 8 10 12 14 5 1200 700 (213) 450 (137) 225 (84) 200 (61) 7 1680 800 (244) 500 (152) 300 (91) 200 (61) 125 (38) 10 2400 800 (244) 550 (168) 350 (107) 225 (69) 125 (38) 100 (31) 15 3600 600 (183) 350 (107) 225 (69) 150 (46) 75 (23) 60 (18) 20 4800 450 (137) 275 (84) 175 (53) 100 (31) 60 (18) 25 6000 350 (107) 225 (69) 125 (38) 75 (23) 30 7000 300 (91) 175 (53) 100 (31) 75 (23) 35 8400 250 (76) 150 (46) 100 (31) 40 9600 225 (69) 125 (38) 75 (23) 45 10,800 200 (61) 125 (3...