# Solar Conduit Fill — NEC Ch.9 PV Conduit

> NEC Ch.9 PV Conduit (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/solar-conduit-fill/id6767838661 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 32 MB
- Languages: American English
- Released: 2026-05-11
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/solar-conduit-fill/id6767838661/reviews.md

## What is Solar Conduit Fill?

Solar Conduit Fill calculator sizes conduits for solar PV wiring per NEC Chapter 9, Table 1.

# Features
- Conduit types: EMT, IMC, RMC, PVC Schedule 40, PVC Schedule 80
- Trade sizes from 1/2 inch to 4 inches
- Wire types: THHN, THWN, XHHW per NEC Table 5; USE-2 per its RHW-2 dual rating; PV wire (UL 4703) sized from manufacturer 2 kV nominal OD
- Wire sizes from 14 AWG to 4/0 AWG
- Number of conductors
- Calculated outputs: conduit cross-section area, max fill area (53% for 1 conductor, 31% for 2, 40% for 3+), total wire area, fill % actual vs allowed, pass/fail check, remaining capacity, additional conductors that can fit
- NEC reference per case

# Standards
- NEC Chapter 9, Table 1 (conduit fill percentages)
- NEC Chapter 9, Table 4 (conduit cross-section areas)
- NEC Chapter 9, Table 5 (wire dimensions)

# For
Solar installers, electrical contractors, designers, inspectors, AHJ reviewers.

# Optional Pro Upgrade - $2.99 one-time in-app purchase
Pro unlocks history, dark mode, PDF export, and removes ads. One-time purchase.

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
- Unlimited saved calculation history
- PDF export of results
- Dark theme
- Ad-free experience

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-06-12

PV wire now sized from manufacturer 2 kV nominal OD (UL 4703 - not in NEC Table 5):
- PV wire areas were XHHW copies, under-sizing conduit up to 2.8x - fixed
- USE-2 now per its RHW-2 dual rating (NEC Table 5 RHW-2 row)
- Result cites the dimension source per wire type
- Listing matched to actual catalog (5 conduit types, 14 AWG-4/0)

### 1.0.1 — 2026-05-14

- Fixed cross-app links: tapping another SolarTools app in More Tools now opens its App Store page on iPhone and iPad.
- Minor stability improvements.

### 1.0.0 — 2026-05-11

No release notes.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-08.*