Solar Conduit Fill

About this app

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

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)

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Oct 16, 2026 · 4:59 PM $0.99