Voltage Drop Calculator
Calculate voltage drop for single-phase and three-phase circuits per NEC 210.19(A).
Wire Sizing Calculator
Size conductors per NEC Table 310.16 with temperature correction and conduit fill derating.
Residential Load Calculation
Calculate dwelling unit electrical demand per NEC Article 220/120 optional method.
Commercial Load Calculation
Calculate commercial building electrical demand with occupancy-specific demand factors.
Conduit Fill Calculator
Calculate conduit fill percentage for mixed conductor sizes per NEC Chapter 9.
OCPD Sizing Calculator
Size overcurrent protection devices (breakers/fuses) per NEC Article 240 with special rules for motors and transformers.
Grounding & Bonding Calculator
Size equipment grounding conductors and grounding electrode conductors per NEC Article 250.
Multi-NEC-Edition Support
How the calculator handles NEC 2017, 2020, 2023, and 2026 edition differences.
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