Electrician's Calculations Manual, Second Edition THE ULTIMATE ONTHEJOB COMPANIONFULLY UPDATED Thoroughly revised to reflect the 2011 National Electrical Code (NEC) and the latest industry advances, Electrician's Calculations Manual, Second Edition gives you quick access to the basic calculations needed for any given job. The book also serves as an ideal review for license preparation. Endofchapter questions plus an endofbook final test help reinforce the material covered. Written by a Master Electrician with more than 40 years of experience, this practical guide helps you:

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Contents
1  
5  
2 Alternating Current Calculations  25 
3 Transformers  45 
4 Miscellaneous Calculations  61 
5 Motors  87 
6 SingleDwelling Load Calculations  103 
7 Multifamily Load Calculations  119 
8 Commercial Calculations  137 
9 Miscellaneous Service Entrance Calculations  155 
10 Conduit Bending  169 
11 Math Review  195 
Final Test  223 
Answers to EndofChapter Tests and Final Test  229 
Index  255 
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Common terms and phrases
15 amperes 2KIL 40 horsepower 50 amperes 90 degree bend air conditioning ampacity amperage Appliance circuits 1500 Article bender branch circuit short cable circuit and groundfault circuit short circuit clothes dryers connected cooktop copper conductors cosecant decimal degree angle delta demand factor denominator derated developed length divide duty cycle electrons equal sign example feeder Figure fixed appliances full load current fuse garbage disposal heating high leg horsepower motor hypotenuse inches Conduit KVARS largest motor mark multifamily dwelling multiply nameplate rating National Electrical Code NEC Table needed neutral load ohms oven overcurrent device parallel phase angle power factor power plant radius resistors single phase singlephase sq ft square feet square foot standard calculation stub subtract THHN threephase load transformer triangle ungrounded conductors unit volt amperes voltage drop water heater wattage watts watts per sq watts per square welders windings wire