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David B. February 20th, 2010
Posted In: Conversion Charts
| Approximate Horsepower |
120 Volts
|
240 Volts
|
|||
| Full Load | Locked Rotor | Full Load | Locked Rotor | ||
| 1/4 | AC | 4.4 | 26.4 | 2.2 | 13.2 |
| DC | — | — | — | — | |
| 1/4 | AC | 5.8 | 34.8 | 2.9 | 17.4 |
| DC | 2.9 | 29.0 | 1.5 | 15.0 | |
| 1/3 | AC | 7.2 | 43.2 | 3.6 | 21.6 |
| DC | 3.6 | 36.0 | 1.8 | 18.0 | |
| 1/2 | AC | 9.8 | 58.8 | 4.9 | 29.4 |
| DC | 5.2 | 52.0 | 2.6 | 26.0 | |
| 3/4 | AC | 13.8 | 82.8 | 6.9 | 41.4 |
| DC | 7.4 | 74.0 | 3.7 | 37.0 | |
| 1 | AC | 16.0 | 96.0 | 8.0 | 48.0 |
| DC | 9.4 | 94.0 | 4.7 | 47.0 | |
| 1 1/2 | AC | 20.0 | 120.0 | 10.0 | 60.0 |
| DC | 13.2 | 132.0 | 6.6 | 66.0 | |
| 2 | AC | 24.0 | 144.0 | 12.0 | 72.0 |
| DC | 17.0 | 170.0 | 8.5 | 85.0 | |
| 3 | AC | 34.0 | 204.0 | 17.0 | 102.0 |
| DC | 25.0 | 250.0 | 12.2 | 122.0 | |
| 5 | AC | 56.0 | 366.0 | 28.0 | 168.0 |
| DC | — | — | 20.0 | 200.0 | |
| 7 1/2 | AC | 80.0 | 480.0 | 40.0 | 240.0 |
| DC | — | — | 29.0 | 290.0 | |
* Locked rotor ratings shown are 6 times full load on AC and 10 time full load on DC. The above chart is offered as a guide only, as all motors do not necessarily come within the maximum ratings shown in the chart.
David B. February 20th, 2010
Posted In: Conversion Charts
This chart shows four ways to figure each value:
Amps (1), Volts (E), Ohms (R), or Watts (W)
| Example: | ||
| A 4800 watt electric heat element is connected to a 240 volt circuit. | ||
| How many Amps (1) does it draw? | ||
| Solution: | ||
| Locate Amps section of chart- | ||
| Watts (W) | = Amps (1) | |
| Volts (E) | ||
| Thus 4800 / 240 = 20Amps. Carried further, what is the resistance? | ||
| Volts(²) (E²) | = Ohms (R) 240 x 240 / 4800 = 12 Ohms | |
| Watts (W) | ||
David B. February 20th, 2010
Posted In: Conversion Charts
| 240 Volts | 208 Volts | 120 Volts |
| 6000 Watts | 4500 Watts | 1500 Watts |
| 5000 Watts | 3750 Watts | 1250 Watts |
| 4000 Watts | 3000 Watts | 1000 Watts |
| 3000 Watts | 2250 Watts | 750 Watts |
| 2500 Watts | 1875 Watts | 625 Watts |
| 2000 Watts | 1500 Watts | 500 Watts |
Always use a higher voltage element to replace a lower voltage element.
To calculate the wattage at a lower voltage see formula’s below.
| Convert 480V to 240V, Multiply wattage at 480V times 25%. |
| Convert 240V to 208V, Multiply wattage at 240V times 75%. |
| Convert 240V to 120V, Multiply wattage at 240V times 25%. |
| Convert 208V to 120V, Multiply wattage at 208V times 33%. |
| For use in single phase 60hz. applications only. |
David B. February 20th, 2010
Posted In: Conversion Charts
Volume-Weight Conversions wt. lbs.
| 1 Cubic Foot of Water | 62.4* |
| 1 Cubic Inch of Water | 0.0361* |
| 1 Gallon of Water | 8.33* |
| 1 Cubic Foot of Air | .075+ |
| 1 Cubic Inch of Steel | 0.284 |
| 1 Cubic Foot of Brick (Building) | 112-120 |
| 1 Cubic Foot of Concrete | 120-140 |
| 1 Cubic Foot of Earth | 70-120 |
Volume-Weight Conversions Wt. Kilograms
| 1 Cubic Foot of Water | 28.3* |
| 1 Cubic Inch of Water | 0.0164* |
| 1 Gallon of Water | 3.788 |
| 1 Cubic Foot of Air | 0.034+ |
| 1 Cubic Inch of Steel | 0.1288 |
| 1 Cubic Foot of Brick (Building) | 51-54 |
| 1 Cubic Foot of Concrete | 54-64 |
| 1 Cubic Foot of Earth | 32-54 |
David B. February 20th, 2010
Posted In: Conversion Charts
To Convert Pressure (at 32° F)
| From | To | Multiply By |
| Inches of Water | Pounds per Sq. Inch | 0.03612 |
| Pounds per Sq. Inch | Inches of Water | 27.686 |
| Feet of Water | Pounds o Sq. Inch | 0.4334 |
| Pounds per Sq. Inch | Feet of Water | 2.307 |
| Inches of Mercury | Pounds per Sq. Inch | 0.4912 |
| Pounds per Sq. Inch | Inches of Mercury | 2.036 |
| Atmospheres | Pounds per Sq. Inch | 14.696 |
| Pounds per Sq. Inch | Atmospheres | 0.06804 |
To Convert Pressure (at 32° F) – English to Metric
| From | To | Multiply By |
| Inches of Water | Newton/Sq. Meter | 249.082 |
| Pounds per Sq. Inch | Newton/Sq. Meter | 6894.8 |
| Feet of Water | Newton/Sq. Meter | 2988.98 |
| Pounds per Sq. Inch | Kilograms/Sq. Cent | 0.07031 |
| Inches of Mercury | Newton/Sq. Meter | 3386.4 |
| Pounds per Sq. Inch | Dyne/Sq. Cent. | 68948.0 |
| Atmospheres | Newton/Sq. Meter | 101325.0 |
| Pascal | Newton/Sq. Meter | 1.0 |
David B. February 20th, 2010
Posted In: Conversion Charts
English Conversion Factors & Data
To Convert Measurements
| From | To | Multiply By |
| Cubic Feet | Cubic Inches | 1728. |
| Cubic Inches | Cubic Feet | 0.00058 |
| Cubic Feet | Gallons | 7.480 |
| Gallons | Cubic Feet | 0.1337 |
| Cubic Inches | Gallons | 0.00433 |
| Gallons | Cubic Inches | 231. |
| Barrels | Gallons | 42. |
| Gallons | Barrels | 0.0238 |
| Imperial Gallons | U.S. Gallons | 1.2009 |
| U.S. Gallons | Imperial Gallons | 0.8326 |
| Feet | Inches | 12. |
| Inches | Feet | 0.0833 |
| Square Feet | Square Inches | 144. |
| Square Inches | Square Feet | 0.00695 |
| Short Tons | Pounds | 2000. |
| Liters | U.S. Gallons | 0.2642 |
To Convert Measurements
| From | To | Multiply By |
| Cubic Feet | Cubic Centimeters | 28317.0 |
| Cubic Inches | Cubic Centimeters | 16.387 |
| Cubic Feet | Liters | 28.32 |
| Gallons | Liters | 3.7854 |
| Cubic Inches | Liters | 0.0164 |
| Gallons | Cubic Centimeters | 3785.4 |
| Barrels | Cubic Meters | 1.0551 |
| Imperial Gallons | Cubic Meters | 0.0045461 |
| U.S. Gallons | Cubic Meters | 0.0037854 |
| Feet | Meters | 0.3048 |
| Inches | Meters | 0.0254 |
| Square Feet | Square Meters | 0.0929 |
| Square Inches | Square Centimeters | 6.452 |
| Ton (Short, 2000 lb.) | Kilograms | 907.2 |
| Liter | Cubic Meters | 0.001 |
| Pounds | Kilograms | 0.45359 |
David B. February 20th, 2010
Posted In: Conversion Charts
To Convert Power – English
| From | To | Multiply By |
| Horsepower | Metric Horsepower | 1.014 |
| Horsepower | Ft./Power per Minute | 33000. |
| Horsepower | Kilowatts | 0.746 |
| Kilowatts | Horsepower | 1.3404 |
| British Thermal Units | Foot/Pounds | 778.177 |
| Foot/Pounds | British Thermal Units | 0.001285 |
| British Thermal Units | Horsepower Hours | 0.0003927 |
| Horsepower Hours | British Thermal Units | 2544.1 |
| British Thermal Units | Kilowatt Hours | 0.0002928 |
| Kilowatt Hours | British Thermal Units | 3415. |
| Watt Hours | British Thermal Units | 3.415 |
To Convert Energy, Heat and Power – English to Metric
| From | To | Multiply By |
| Horsepower | Watt | 745.7 |
| British Thermal Units | Joule | 1054.35 |
| Foot-Pounds | Joule | 1.3558 |
| British Thermal Units | Calorie | 252.0 |
| British Thermal Units | Watt-Second | 1054.35 |
| Watt-Second | Joule | 1.0 |
| Calorie | Joule | 4.184 |
| Watt-Hours | Joule | 3600.0 |
| Kilocalorie/Minute | Watt | 69.73 |
| Ton (Refrigeration) | Watt | 3516.8 |
| BTU/Hour | Watt | 0.29288 |
| BTU/In/Hr. Ft.(2) ° F | Watt/Meter K | 0.14413 |
| BTU/Hr. at 10° F TD | Kcal/Hr. at 6° C. TD | 0.252 |
| BTU/Hr. at 15° F TD | Kcal/Hr. at 8° C. TD | 0.252 |
David B. February 20th, 2010
Posted In: Conversion Charts
4.7