# Every circuit, breaker and box. Counted.

> New circuits and service upgrades: StudSheet counts the cable by gauge, the boxes, devices and breakers, the service conductors and the grounding, with the math shown and the code notes for the job’s state or province, then prices it from your price book for an estimate the client signs on their phone.

## The electrical Sheets

- **[Circuits and wiring runs](https://studsheet.com/sheets/circuits)**: lighting, receptacle, kitchen countertop, bathroom, laundry, dryer, range and EV charger circuits (hardwired or a NEMA 14-50), in NM-B, MC or EMT, with AFCI and GFCI protection, the voltage drop and the panel spaces they take.
- **[Panel or service upgrade](https://studsheet.com/sheets/panel)**: the load calculation, the meter-main, the panel and a breaker for every circuit, the service conductors, and the grounding and bonding, with the utility and permit steps.

> Homeowners see these Sheets stamped PRO JOB: what the work involves, the permit, and quotes from licensed electricians. No wiring steps. Electricians with StudSheet Pro get the full takeoff.

## From the circuits Sheet: 3 circuits

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

| Buy | Item | How StudSheet counts it |
|---|---|---|
| **515 ft — 2 × 250 ft rolls + 1 × 25 ft roll** | NM cable 12/2 with ground | General receptacles: 3 × (40 ft home run + 7 × 14 ft between boxes + 18 ft slack) + 10%. Slack: 3 ft at the panel and 1 ft for every cable end in a box. |
| **24 boxes** | Single-gang box, new work | One per receptacle and switch. Size each for its fill: 2.0 cu in per 14 AWG and 2.25 per 12 AWG conductor, the device counts as two (NEC 314.16). |
| **24 receptacles** | Receptacle, 20 A tamper-resistant | 24 for general receptacles. 15 A receptacles are allowed on a 20 A circuit with two or more of them (NEC 210.21(B)(3)); a single receptacle on its own 20 A circuit must be 20 A. Tamper-resistant throughout a home (NEC 406.12). |
| **24 plates** | Wall plates, single-gang | One per device. |
| **3 breakers** | AFCI breaker (combination type) | 3 for general receptacles (arc-fault). Only breakers listed for this panel’s brand and type (NEC 110.3(B)). |

The Sheet has 8 lines like these, each with its math. Change a size and every line follows; on a job, each line takes your price. [The whole worked example](https://studsheet.com/sheets/circuits) · [Open the circuits calculator](https://app.studsheet.com/p/circuits)

## Questions

### What wire size for a 15, 20, 30, 40 or 50 amp circuit?

For copper NM-B under the NEC: 14 AWG for 15 A, 12 AWG for 20 A, 10 AWG for 30 A, 8 AWG for 40 A and 6 AWG for 50 A. Long runs can need a bigger wire for voltage drop, and an EV charger’s circuit is sized at 125% of its load. The [circuits takeoff](https://studsheet.com/sheets/circuits) checks both. Confirm with your inspector.

### Do homeowners get wiring instructions?

No. Circuits and panel upgrades carry the PRO JOB stamp: homeowners see what’s involved and the permit, and can ask licensed pros for quotes. That’s a licensed pro’s job.