Tools
Service Entrance Load Calculator
NEC Article 220 single-family dwelling service-entrance load calculator. Walks through lighting, appliances, HVAC, motors, and extra loads to size your service.
Box Selector
Find the right electrical box for your fill. Enter conductors, device yokes, clamps, and EGCs to see which standard boxes from NEC Table 314.16(A) legally fit.
Voltage Drop Calculator
Calculate conductor voltage drop using NEC 2020 Table 9 AC resistance values. Single-phase and three-phase, copper and aluminum, branch and feeder circuits.