Electrical Load & Wire Sizing

Residential Electrical Load Estimate & Wire Screening is an offline planning tool for exploring example residential loads.

The service estimate accepts floor area, small-appliance and laundry circuits, and entered appliance and HVAC loads. For a nonzero household dryer input it uses at least 5,000 VA; for a nonzero EVSE input it uses at least 7,200 VA. It applies a simplified lighting and general-appliance demand calculation and shows the result at 240 V with an illustrative service-size tier.

The separate wire screen shows a basic copper 75°C ampacity lookup and a single-phase voltage-drop estimate for the selected current, distance, and voltage. Its 3% value is a planning target.

This app does not perform a complete NEC service, feeder, branch-circuit, conductor, or panel-schedule calculation. It does not account for every applicable demand factor, continuous-load condition, conductor correction, equipment rating, installation condition, or local amendment. The estimate and wire screen are not for selecting, installing, permitting, or approving electrical equipment. Have a qualified electrical professional perform the complete calculation using the locally adopted code and confirm requirements with the authority having jurisdiction.

Project data is stored locally on the device. No account or cloud login is required.