NEC load calculation · Plans – Panel – Price
Residential load calculation and service sizing
Housewire runs the NEC dwelling load calculation live from the devices and square footage on your plan, by the standard or optional method. Every line is traced to the devices and the code section it came from, and you get a recommended service size with service conductor, feeder and grounding electrode conductor sizes.
From the layout
Lighting load from the verified square footage, appliances from what you placed.
Standard or optional
Choose the method; the worksheet shows each line and its NEC section.
Service sizing
Recommended service with conductor and GEC sizes; you make the final call.
Duplexes and shops
Each unit, the building service, and feeders to detached structures.
By edition and state
NEC 2020, 2023 and 2026 with state and local amendments labeled.
Permit-ready
A clean load calc PDF stating the code edition, state and amendments used.
Questions
More answers on the Housewire home page.
Which load calculation methods does Housewire use?
The NEC dwelling standard method and the optional method, as defined by the edition and amendments your project is set to. The worksheet shows every line with its NEC reference.
Does it size the service conductors and GEC?
It recommends the service size and the service conductor, feeder and grounding electrode conductor sizes from the active code tables. The electrician makes the final choice and verifies with the local inspector.
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