TruePhase – Phase & Colors
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About this app
Look up the wire color and circuit phase for any panel slot in seconds. TruePhase is a fast, on-device field reference for electricians, apprentices, estimators, and inspectors.
Type a circuit number on the big keypad and instantly see the common US phase color, voltage system, panel position (odd/even two-column), neutral, ground, and a field-convention note. No sign-in, no signal needed — everything runs locally on your phone.
WHAT IT DOES (FREE)
- Fast circuit-number keypad lookup with an instant phase and color result.
- Common US 120/240V single-phase convention.
- Odd/even two-column panel position for every circuit.
- Wire-list browse view of phase, neutral, and ground colors.
- Color swatch plus text label on every result for clear, accessible reading.
- Field-convention warning on every lookup — verify before you pull wire.
- Light and dark mode.
PRO UNLOCK
- Three-phase systems — 120/240V high-leg delta (Black / Orange / Blue), 120/208V wye, and 277/480V wye (Brown / Orange / Yellow).
- Saved panels with name, location, system, and circuit count.
- Per-circuit load descriptions and 2-pole / 3-pole breaker grouping.
- Custom phase colors and custom numbering (left/right starts + row step).
- Project presets — save, apply, replace, and delete.
- Panel notes for job, room, or load reminders.
- Copy and share lookup results and panel summaries.
- Printable, contractor-ready panel schedule with your company info.
- CSV export of saved panels for your records.
WHO IT'S FOR
Electricians and apprentices pulling and terminating conductors, estimators laying out panel schedules, and inspectors checking conductor identification in the field.
ACCURACY
TruePhase presents the common US field conventions for phase colors and shows the NEC-required identifications alongside them: the high-leg (orange) marking on 4-wire delta systems (110.15), the white or gray grounded/neutral conductor (200.6), branch-circuit conductor identification (210.5), and the green equipment grounding conductor (250.119). Ungrounded phase colors are common field practice, not a blanket NEC mandate — always confirm project specs, labeling, the NEC edition adopted in your jurisdiction, and site standard before pulling wire.
PRICE
TruePhase is free to download and use for 120/240V single-phase lookup. A one-time Pro Unlock ($4.99 — no subscription, no renewals) unlocks all three-phase systems and every Pro feature. Buy once, own it forever.
PRIVACY
Every lookup runs on your device. TruePhase collects no personal data, requires no account, and works fully offline. Saved panels and company info stay in local storage on your phone and are never transmitted.
Built by 509 Electric, a licensed Washington electrical contractor (EL01) in Yakima — field tools made by people who wire buildings for a living. Part of the True suite of NEC field calculators for electricians.
Type a circuit number on the big keypad and instantly see the common US phase color, voltage system, panel position (odd/even two-column), neutral, ground, and a field-convention note. No sign-in, no signal needed — everything runs locally on your phone.
WHAT IT DOES (FREE)
- Fast circuit-number keypad lookup with an instant phase and color result.
- Common US 120/240V single-phase convention.
- Odd/even two-column panel position for every circuit.
- Wire-list browse view of phase, neutral, and ground colors.
- Color swatch plus text label on every result for clear, accessible reading.
- Field-convention warning on every lookup — verify before you pull wire.
- Light and dark mode.
PRO UNLOCK
- Three-phase systems — 120/240V high-leg delta (Black / Orange / Blue), 120/208V wye, and 277/480V wye (Brown / Orange / Yellow).
- Saved panels with name, location, system, and circuit count.
- Per-circuit load descriptions and 2-pole / 3-pole breaker grouping.
- Custom phase colors and custom numbering (left/right starts + row step).
- Project presets — save, apply, replace, and delete.
- Panel notes for job, room, or load reminders.
- Copy and share lookup results and panel summaries.
- Printable, contractor-ready panel schedule with your company info.
- CSV export of saved panels for your records.
WHO IT'S FOR
Electricians and apprentices pulling and terminating conductors, estimators laying out panel schedules, and inspectors checking conductor identification in the field.
ACCURACY
TruePhase presents the common US field conventions for phase colors and shows the NEC-required identifications alongside them: the high-leg (orange) marking on 4-wire delta systems (110.15), the white or gray grounded/neutral conductor (200.6), branch-circuit conductor identification (210.5), and the green equipment grounding conductor (250.119). Ungrounded phase colors are common field practice, not a blanket NEC mandate — always confirm project specs, labeling, the NEC edition adopted in your jurisdiction, and site standard before pulling wire.
PRICE
TruePhase is free to download and use for 120/240V single-phase lookup. A one-time Pro Unlock ($4.99 — no subscription, no renewals) unlocks all three-phase systems and every Pro feature. Buy once, own it forever.
PRIVACY
Every lookup runs on your device. TruePhase collects no personal data, requires no account, and works fully offline. Saved panels and company info stay in local storage on your phone and are never transmitted.
Built by 509 Electric, a licensed Washington electrical contractor (EL01) in Yakima — field tools made by people who wire buildings for a living. Part of the True suite of NEC field calculators for electricians.
Wire colors & circuit phase lookup for electricians. Fast panel reference.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- No data collectedLearn more about how developers declare collection
What’s new
Initial closed testing release. Phase and panel lookup calculator for electricians.
App support
About the developer
NICKOLAS LANE NALLEY
nick@509electric.com
3306 West Viola Avenue
Yakima, WA 98902
United States
