Raceway fill
35.3%
40% limit · 0.7176 in² of 2.0360 in²
Within selected limit
- 3 × Phase conductors0.6669 in²
- 1 × Equipment grounding conductor (6 AWG)0.0507 in²
WireWicket / Permit Package — in development
Design once, then review supported checks and build a material cost rollup.
A project workspace for electrical calculations and material planning.
Available now: Live standalone calculators, project circuit records, supported check handoffs, material quantities, and known-price totals. The interactive sample submittal is clearly a sample.
In development: Full code-compliance circuit sizing, plan recognition, labor, bid/profit, and a full contractor-ready package.
For US electrical contractors, estimators & engineers
Interactive submittal preview
Adjust the circuit. See the handoff.
A
A
ft
°F
Applied to the verified AC calculation when PVC is selected. EMT uses a resistance-only screening estimate; this input is not applied there.
Demo assumptions: copper THHN / THWN-2, 90°C ampacity starting column, 86°F base ambient, three current-carrying phases, and no neutral. The 200 A overcurrent-device rating is an illustrative default; confirm it for the actual circuit.
The Table 250.122 base copper EGC is calculated from this rating. No manual EGC size is assumed.
Live output
Three-phase values recalculate as you edit.
Equipment grounding conductor
6 AWG copper
200 A device · Table 250.122 base 6 AWG
- Modeled minimum phase
- 2/0 AWG
- Selected phase
- 2/0 AWG
- Modeled ampacity check
- Selected phase meets the modeled ampacity baseline.
- Required EGC area
- 26,240 cmil
- Selected EGC area
- 26,240 cmil
- NEC 250.122(B)
- No proportional increase is needed; the EGC remains at or above the Table 250.122 base size. NFPA 70 (2026) source
Three-phase voltage drop
5.88 V
1.22% of 480 V line-to-line · Resistance-only screening estimate
Derated ampacity
195 A
195 A base × 1.00 ambient × 1.00 conductor factor
Circuit basis
480Y/277V
3 current-carrying conductors · 4 conductors counted for fill
Voltage basis: Resistance-only, unity-power-factor screening estimate using K = 12.9 at 75°C. It does not include inductive reactance, apply the entered power factor, or model EMT/RMC impedance. Use an installation-specific AC impedance calculation for design review. NCCER Electrical Formula Sheet
Ampacity basis: 90°C is the starting column only; its source row is cross-checked to Southwire Installation Guide, NEC Table 310.15(B)(16) (formerly 310.16), reprinted 2017. The 75°C Table 310.16 value for this conductor is 175 A. Terminal, load, and other NEC limits are not evaluated here. NEC Table 310.16 NFPA 2026 code-cycle table Southwire table cross-check
Phase and EGC sizing: This is a modeled minimum using the available copper 90°C starting-column rows and supported correction factors. It is not a final verified conductor selection; check 75°C terminal limits, load rules, and installation conditions. NEC 250.122(A) and 250.122(B)
Fill references: Chapter 9, Table 1 (permitted fill); Table 4 (EMT raceway area); Table 5 (THHN / THWN-2 conductor area). Article 358 (EMT). View NFPA 70 (2026) in NFPA LiNK
Restoring this tab’s saved example inputs…
01 / Calculation desk
The checks that shape the install.
Keep useful code context close to the inputs, so a calculation is easier to review and easier to pass along.
Raceway fill
Check conductor fill across common raceways, with NEC Chapter 9 references alongside the calculation.
EMT · RMC · PVCOpen calculator
Raceway fill batch schedule
Edit a group of conductor and raceway rows, then review each valid result and correction in place.
Multiple rows · row-level validationOpen batch schedule
Ampacity derating
Bring ambient-temperature and current-carrying conductor adjustments into the same review.
Temperature · conductor countOpen calculator
Voltage drop
Estimate single- or three-phase voltage drop using verified resistance and reactance data where available.
Single + three phase · copper + aluminumOpen calculator
Box fill & pull-box sizing
Add NEC 314.16 fill allowances, check box capacity, and size 4 AWG-and-larger pull boxes.
NEC 2026 · project cut sheetsOpen NEC 314 calculator
Motor branch-circuit sizing
Use supported NEC motor table rows for full-load current, conductors, branch protection, overloads, and the equipment grounding conductor.
NEC 2026 · raceway handoffOpen calculator
Transformer sizing
Calculate winding current, transformer overcurrent limits, and copper conductor and ground sizes with a direct raceway-fill handoff.
NEC 2026 · primary + secondary · raceway handoffOpen calculator
Free NEC lookup pages
Get a quick, cited answer for supported code questions, then adjust the inputs in a live raceway-fill calculator.
Derived answers · NEC 2026 sourcesBrowse NEC lookups
02 / From run to record
Keep the project behind the calculation.
Separate calculators are easy to find. A consistent project record and a clean handoff are what help teams stay in sync.
- 01
Save the circuit once
Create or open a project and keep the circuit inputs, material basis, and route assumptions together.
- 02
Review supported checks
See supported advisory outputs and explicit unsupported or not-assessed states without a compliance claim.
- 03
Build the material schedule
Reuse the saved circuit to generate quantities and a known-price material subtotal, with unpriced lines called out.
Reference note
Clear references. A careful final check.
WireWicket helps organize calculation inputs and NEC references. Verify every reference and result against the NEC edition adopted for the job and the project’s requirements.
03 / Start a conversation
Bring your next submittal into focus.
Tell us how your team handles electrical calculations and project documentation.
Email WireWicketwirewicket-7@polsia.app
00 / Project record
Project record