You must be in android version 2.3 Gingerbread or greater.A most have utility for electrician, electrical contractors or those looking to pass an electrical certification. Calculations per National Electric Code 2011.Calculations included:Voltage Drop-Circuit’s Conductors voltage drop.-Minimum Conductor Size.Pipe Bend-Offset.-Three bend saddles.Raceway calculations-Raceway size calculation.-Maximum number of same wire. -Spacing for Conductor Supports.-Conduit support.-Conduit spacing.Ampacity-Conductor Ampacity, wire size.-table 301.15(B)(16).Box Fill-Sizing outlet box.-Sizing Pull box.Load calculation (Residential)-Single family.-Range and dryer’s calculation.-Service Feeder Conductors.Transformers-Transformers OCPD calculations.Motors calculations-Motor OCPD calculations.-Motor NEMA Starters calculation.-Motor Locked Rotor Calculation.Electrical schematics-Delta-delta transformers.-Delta-wye transformers.-Three way switch.-Start/stop AC motor.-3 phase A.C. Motor Windings and Connections Wye-3 phase A.C. Motor Windings and Connections DeltaBurial Depth-600v or less.-Over 600v.Grounding-Equipment Grounding-Grounding Electrode Conductor.-And more coming soon! Stay tuned for updates.If you like to report bugs or suggestions, please send them to electriciansbible@gmail.com