Solar Conduit Fill NEC Ch.9

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About this app

Conduit Fill Calculator for Solar PV Wiring (NEC Chapter 9)

# What it does
Verifies conduit fill percentage against NEC Chapter 9 limits for PV DC and AC conductor runs. Supports EMT, PVC, IMC, and rigid conduit.

# Features
- Conduit types: EMT, PVC (Sch 40/80), IMC, RGS
- Trade sizes 1/2 inch through 4 inch
- 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 14 AWG through 4/0 AWG
- Conduit fill limits per NEC Chapter 9 Table 1: 53% (1 conductor), 31% (2), 40% (3+)
- PASS / FAIL status indicator
- Maximum allowed fill area
- Additional conductor capacity

# Made for
Solar installers, PV technicians, electrical contractors, code inspectors, apprentice electricians.

# Optional Pro Upgrade — $2.99 one-time
The following features require a separate one-time in-app purchase. They are not required to use the calculator:
- Calculation history (saved & searchable)
- PDF report export with NEC references
- Dark theme
- Ad-free experience

What’s new

v1.0.0 — Initial release
- Calculator with NEC compliance
- Save & history (Pro)
- PDF export (Pro)
- English & Spanish
- Light & Dark theme