Electrician's Bible

Electrician's Bible is a comprehensive NEC 2023 electrical reference and calculation tool for electricians, electrical contractors, technicians, students, and electrical professionals.

Quickly access electrical calculations, NEC references, conductor and raceway tools, conduit bending calculations, motor and transformer calculations, load calculations, grounding information, electrical formulas, tables, and much more — all in one application.

ELECTRICAL CALCULATIONS

• Voltage drop
• Minimum conductor size
• Conductor ampacity and wire sizing
• Box fill and pull box sizing
• Raceway and conduit calculations
• Cable tray calculations
• Electrical formulas and Formula Wheel
• Power Triangle
• Series and parallel calculations
• Unit and fraction calculators

CONDUIT & PIPE BENDING

• Offset bends
• Three-bend saddles
• Rolling offsets
• Segment bending
• Double 45° and 90° bends
• Conduit support information

MOTOR & TRANSFORMER TOOLS

• Multi-Motor Calculator
• Motor overcurrent protection calculations
• NEMA starter calculations
• Locked-rotor calculations
• Multi-Compressor Calculator
• Transformer sizing
• Transformer overcurrent protection
• Transformer short-circuit calculations
• Delta-Wye transformer calculations

LOAD CALCULATIONS

• Residential and single-family calculations
• Range and dryer calculations
• Service and feeder calculations
• Bank load calculations
• Store load calculations
• School load calculations
• Multifamily dwelling calculations
• Office building calculations
• Restaurant calculations
• Motor load calculations

NEC 2023 REFERENCES & ELECTRICAL INFORMATION

• NEC tables and references
• Raceway and conductor information
• Grounding and bonding information
• Burial depth information
• NEMA device configurations
• Electrical symbols and schematics
• Wire and phase color codes
• Search and favorites

ADDITIONAL PROFESSIONAL TOOLS

• Arc-flash information and calculations
• NFPA 70E reference information
• Torque specifications
• Electrical schematics
• Network cable wiring pinouts
• Temperature, energy, length, AWG, torque, and other conversions

Electrician's Bible brings commonly used electrical calculations, NEC 2023 references, and field information together in one convenient tool for the field, shop, classroom, or jobsite.

National Electrical Code and “NEC” are registered trademarks of the National Fire Protection Association (NFPA).

Questions, bug reports, or suggestions: electricianbible@gmail.com

Recent changes:
What's New in Electrician's Bible!

NEW! Wire Length by Resistance Calculator!
• Estimate conductor length from measured resistance.
• Copper and aluminum support.
• Single-wire and two-wire loop calculations.
• Temperature and test-lead compensation.
• Results in feet and meters.

ACCESSIBILITY IMPROVEMENTS
• Fixed calculation results being cut off with larger Android font sizes.
• Improved display readability across multiple calculators.

Built from your feedback — keep the ideas coming!