# Circuits and wiring

> New circuits, wire sizes and breaker loads. Ask with your Sheet attached: homeowners who’ve done it and verified pros answer, and anyone can read it.

## Before you ask

What the circuit powers, the run length, the panel, and your town.

- **Attach your Sheet** so people see your sizes and the math.
- **Your town is enough.** Never your address; check photos for house numbers and plates.
- **Is it safe?** A safety question here goes to pros verified in electrical work, unless you pick another trade. Only they can call it safe or unsafe.

## Circuits and wiring runs

3 circuits: 515 ft of cable, 3 breakers, the boxes and devices, and a voltage-drop check.

What people get wrong:

- **Covering before the rough-in inspection.** Insulation or drywall over uninspected wiring gets opened back up at your cost.
- **Breakers that aren’t listed for the panel.** Another brand’s breaker that “fits” voids the listing and fails inspection.

[The worked example, every line's math and the code notes](https://studsheet.com/sheets/circuits) · [Your own sizes in the app](https://app.studsheet.com/p/circuits)

## More in Systems

- [Panels and service upgrades](https://studsheet.com/forum/panels-and-service): Panel swaps, 100 to 200 amp upgrades and subpanels
- [Outlets, switches and lights](https://app.studsheet.com/community?tab=talk&room=outlets-and-lights): Outlets, GFCIs, switches and light fixtures
- [EV chargers](https://app.studsheet.com/community?tab=talk&room=ev-chargers): Home EV charging: circuits, panels and permits
- [Generators and solar](https://app.studsheet.com/community?tab=talk&room=generators-and-solar): Backup power, transfer switches and solar
- [Smoke and CO alarms](https://app.studsheet.com/community?tab=talk&room=smoke-and-co-alarms): Where alarms go, hardwired or battery, and chirping
- [Plumbing rough-in](https://studsheet.com/forum/plumbing-rough-in): Supply and drain layouts, pipe sizes and venting
- [Water heaters](https://studsheet.com/forum/water-heaters): Tank, tankless and heat pump water heaters
- [Leaks and clogs](https://app.studsheet.com/community?tab=talk&room=leaks-and-drains): Leaking pipes, slow drains and clogs
- [Gas lines and appliances](https://app.studsheet.com/community?tab=talk&room=gas-lines): Gas piping, ranges, dryers and smells
- [Wells and water quality](https://app.studsheet.com/community?tab=talk&room=water-quality): Wells, softeners, filters and water pressure
- [Heating and cooling](https://studsheet.com/forum/heating-and-cooling): Sizing furnaces, AC and heat for a house or addition
- [Heat pumps and mini-splits](https://app.studsheet.com/community?tab=talk&room=heat-pumps-and-mini-splits): Ducted and ductless heat pumps
- [Ducts and airflow](https://app.studsheet.com/community?tab=talk&room=ducts-and-airflow): Hot and cold rooms, duct sizes and returns
- [Boilers and radiators](https://app.studsheet.com/community?tab=talk&room=boilers-and-radiators): Hot water and steam heat
- [Smart home and low voltage](https://app.studsheet.com/community?tab=talk&room=smart-home): Thermostats, cameras, doorbells and network wiring
- [Every group](https://studsheet.com/forum#every-group)

## How the community works

- **Open to read** from anywhere, no account needed.
- **Sign in with your email** to ask, answer and vote. No password.
- **The best answers rise:** votes, “worked for me” and a solved mark. Verified pros carry a badge.

Questions? Write to [support@studsheet.com](mailto:support@studsheet.com).