17. CONVERSION TABLES

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1 17. CONVERSION TABLES 17.1 Metric to English Conductor Size Circular Measurements Diameter, Circumference and Area Length, Weight, Area, Power and Energy Temperature Conversion kva to Amperes Horsepower to Amperes

2 17. Conversion Tables 17.1 METRIC TO ENGLISH CONDUCTOR SIZE Table 17.1 Conductor Size Conversion: Metric to English and English to Metric Metric Standard Standard English Conductor Metric English Conductor Area Sizes Sizes Area (mm 2 ) (mm 2 ) (kcmil/awg) (cmil) 1,015 2,000 2,000,000 1,000 1,000 1,970, ,780, ,750 1,750, ,580, ,500 1,500, ,250 1,250, ,240, ,233, ,024, ,000 1,000, , , , , , , , , , , , , , , , , , , ,

3 Table 17.1 Conductor Size Conversion: Metric to English and English to Metric (Continued) Metric Standard Standard English Conductor Metric English Conductor Area Sizes Sizes Area (mm 2 ) (mm 2 ) (kcmil/awg) (cmil) , , , , /0 211, , , /0 167, , , /0 133, , /0 105, , , , , , , , , , , , , , , , , , , , ,

4 17. Conversion Tables Table 17.1 Conductor Size Conversion: Metric to English and English to Metric (Continued) Metric Standard Standard English Conductor Metric English Conductor Area Sizes Sizes Area (mm 2 ) (mm 2 ) (kcmil/awg) (cmil) , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

5 Table 17.1 Conductor Size Conversion: Metric to English and English to Metric (Continued) Metric Standard Standard English Conductor Metric English Conductor Area Sizes Sizes Area (mm 2 ) (mm 2 ) (kcmil/awg) (cmil) Reference: IEC

6 17. Conversion Tables 17.2 CIRCULAR MEASUREMENTS DIAMETER, CIRCUMFERENCE AND AREA Table 17.2 Circular Measurements Diameter, Circumference and Area Diameter Circumference Area Fractional (in.) Decimal (in.) (in.) (sq. in.) 1/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

7 Table 17.2 Circular Measurements Diameter, Circumference and Area (Continued) Diameter Circumference Area Fractional (in.) Decimal (in.) (in.) (sq. in.) / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

8 17. Conversion Tables Table 17.2 Circular Measurements Diameter, Circumference and Area (Continued) Diameter Circumference Area Fractional (in.) Decimal (in.) (in.) (sq. in.) 3 1/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

9 Table 17.2 Circular Measurements Diameter, Circumference and Area (Continued) Diameter Circumference Area Fractional (in.) Decimal (in.) (in.) (sq. in.) 5 1/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

10 17. Conversion Tables Table 17.2 Circular Measurements Diameter, Circumference and Area (Continued) Diameter Circumference Area Fractional (in.) Decimal (in.) (in.) (sq. in.) Notes: 1. Multiply square inches by to calculate mm Multiply inches by 25.4 to calculate mm. 3. Multiply inches by 1,000 to calculate mils. 286

11 17.3 LENGTH, WEIGHT, AREA, POWER AND ENERGY Table 17.3 Conversion Factors Note: Frequently used conversions are shown in bold type. To convert in the reverse direction, divide by the factor given in the table. To Convert From To Multiply By Area Circular mils Square inches Circular mils Square mils Circular mils Square millimeters Square centimeters Square inches Square feet Square meters Square inches Circular mils 1,273, Square inches Square centimeters Square inches Square millimeters Square inches Square mils 1,000, Square meters Square feet Square millimeters Square inches Square millimeters Circular mils 1, Square mils Circular mils Square mils Square inches Length Centimeters Inches Centimeters Feet Feet Centimeters Feet Meters Inches Centimeters 2.54 Inches Meters Inches Millimeters 25.4 Inches Mils 1, Kilometers Miles Meters Feet Meters Inches Meters Yards Miles Kilometers Millimeters Inches Millimeters Mils Mils Inches Mils Millimeters Yards Meters

12 17. Conversion Tables Table 17.3 Conversion Factors (Continued) To Convert From To Multiply By Power Foot-pounds per minute Horsepower Foot-pounds per minute Watts Foot-pounds per second Horsepower Foot-pounds per second Watts Horsepower Foot-pounds per minute 33, Horsepower Foot-pounds per second Horsepower Watts 746 Kilogram-meters per sec. Watts Watts Foot-pounds per minute Watts Foot-pounds per second Watts Horsepower Watts Kilogram-meters per sec Energy British thermal units Foot-pounds British thermal units Joules 1, British thermal units Watt-hours Foot-pounds British thermal units Foot-pounds Joules Foot-pounds Kilogram-meters Gram calories Joules Joules British thermal units Joules Ergs Joules Foot-pounds Joules Gram-calories Joules Kilogram-meters Kilogram-meters Foot-pounds Kilogram-meters Joules Watt-hours British thermal units

13 Table 17.3 Conversion Factors (Continued) To Convert From To Multiply By Weight Kilograms Pounds Kilograms per kilometer Pounds per 1,000 feet Ohms per kilometer Ohms per 1,000 feet Ohms per 1,000 feet Ohms per kilometer Ohms per 1,000 yards Ohms per kilometer Pounds Kilograms Pounds per 1,000 feet Kilograms per kilometer Pounds per 1,000 yards Kilograms per kilometer Pounds per 1,000 yards Pounds per kilometer Newtons Pound-force Pound-force Newtons Miscellaneous Diameter circle Circumference Diameter circle Side of equal square Diameter sphere cubed Volume of sphere U.S. gallons Imperial gallons (British) U.S. gallons Cubic feet U.S. gallons Pounds of water (20 C) 8.33 Cubic feet Pounds of water (4 C) Feet of water (4 C) Pounds per square inch Inches of mercury (0 C) Pounds per square inch Knots Miles per hour

14 17. Conversion Tables 17.4 TEMPERATURE CONVERSION Table 17.4 Degrees Celsius (Centigrade) vs. Degrees Fahrenheit Conversion Formula: F 9/5 C 32 C 5/9 ( F 32 ) C F C F C F C F C F C F C F C F , , , , ,000 1, ,000 2, ,200 2, ,300 2, ,400 2, ,500 2, ,600 2, ,700 3, ,800 3, ,900 3, ,000 3, *0 * *Freezing Boiling 290

15 17.5 KVA TO AMPERES Table 17.5 kva to Amperes Single Phase Circuits kva Current in Amperes at: Rating 120 V 240 V 480 V , ,

16 17. Conversion Tables Table 17.5 kva to Amperes (Continued) Three Phase Circuits kva Current in Amperes at: Rating 208 V 240 V 480 V 600 V , ,380 1, ,080 1,

17 17.6 HORSEPOWER TO AMPERES Table 17.6 Horsepower to Amperes Three Phase Motor Horsepower Current in Amperes at: Rating 208 V 240 V 480 V Note: Based on a motor efficiency of 90 percent and system power factor of 0.8. Above values are theoretical values based solely on numerical calculations. Check with applicable codes for specific ampere values to size overcurrent protective devices or conductors. For example, see Table of the National Electrical Code. 293

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