Tools
9 electrical calculators built from the NEC
Ampacity Reference
NEC Table 310.16 wire ampacity by size, material & temp rating
Voltage Drop
Calculate voltage drop % and verify NEC 3% / 5% limits
Wire Size Calculator
Find minimum wire size for ampacity and voltage drop
Conduit Fill
NEC Chapter 9 conduit fill % for EMT, IMC, RMC, PVC, ENT
Box Fill Calculator
NEC 314.16 junction box conductor fill calculation
Load Calculation
NEC 220 panel load calculation wizard with demand factors
Derating Calculator
Apply ambient temperature & bundling derating factors
AFCI / GFCI Lookup
NEC 210.8 & 210.12 protection requirements by room type
Time & Labor
Estimate job time and labor cost with overhead & markup