 # Electrical And Other Maintenance Formulae

In the construction and maintenance business, having the right equipment to do the job is vital. Having the right knowledge is just as important. We have listed some of the most requested formulae below. If there are others you want to have posted, please contact us.

 TO FIND SINGLE-PHASE THREE-PHASE DIRECT CURRENT Kilowatts I x E x PF 1000 I x E x 1.732 x PF 1000 I x E   1000 KVA I x E 1000 I x E x 1.732 1000 --------------- Horsepower (Output) I x E x %EFF x PF 746 I x E x 1.732 x %EFF x PF 746 I x E x %EFF 746 Amperes when Horsepower is known HP x 746       E x %EFF x PF HP x 746            1.732 x E x %EFF x PF HP x 746   E x %EFF Amperes when Kilowatts is known KW x 1000   E x PF KW x 1000     1.732 x E x PF KW x 1000   E Amperes when KVA is known KVA x 1000 E KVA x 1000 1.732 x E --------------- E = Volts     I = Amperes     %EFF = Percent Efficiency     PF = Power Factor Other Useful Formulae BTUs x 777.5 = foot pounds BTUs x 3.93 ÷ 10,000 = horsepower hours BTUs x 2.93 ÷ 10,000 = Kilowatt hours BTUs per minute x 13.0 = foot pounds per second BTUs per minute x 1.76 ÷ 100 = Kilowatts BTUs per hour x 2.93 ÷ 10,000 = Kilowatts BTUs per hour x 2.98 ÷ 1,000,000 = Boiler horsepower (Celsius x 9 ÷ 5) + 32 = Fahrenheit Circular mils x 0.7854 = Square mils (Fahrenheit - 32) x 5 ÷ 9 = Celsius Foot pounds x 2.29 ÷ 1,000 = BTUs Foot pounds x 5.05 ÷ 10,000,000 = Horsepower hours Foot pounds x 3.77 ÷ 10,000,000 = Kilowatt hours Foot pounds per minute x 1.29 ÷ 1,000 = BTUs per minute Foot pounds per minute x 3.03 ÷ 100,000 = Horsepower Foot pounds per second x 1.82 ÷ 1,000 = Horsepower Horsepower x 42.4 = BTUs per minute Horsepower x 33,000 = Foot pounds per minute Horsepower x 550 = Foot pounds per second Horsepower x 0.746 = Kilowatts Horsepower boiler x 33520 = BTUs per hour Horsepower boiler x 9.80 = Kilowatts Horsepower hours x 2550 = BTUs Horsepower hours x 1,980,000 = Foot pounds Kilowatts x 56.9 = BTUs per minute Kilowatts x 3412 = BTUs per hour Kilowatts x 1.341 = Horsepower Kilowatt hours x 3412 = BTUs Kilowatt hours x 1.34 = Horsepower hours Square inch x 273,000 = Circular mils
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