Pick the raceway type and the insulation, and tap in the conductors, grounds included. The app gives the smallest conduit that holds them by NEC Chapter 9, the percent fill, the jam ratio and a to-scale cross-section, and writes it up as a PDF.
The app’s own example, every screen in order, 10 steps.
STEP 1 OF 10The example opens filled in: three 1 AWG and a 6 AWG ground in EMT, size on Auto, with the answer pinned at the foot of the screen.
STEP 2 OF 10The conductors: THHN / THWN-2 insulation, three 1 AWG and one 6 AWG. Tap a size to add one.
STEP 3 OF 10Three 1 AWG and one 6 AWG, with the size buttons below, 16 AWG to 250 kcmil.
STEP 4 OF 10The 6 AWG marked as the equipment grounding conductor, and the system set to 480Y/277 V, 3-phase for the drawing colors.
STEP 5 OF 10The cross-section to scale: 1-1/4 in EMT, 1.380 in inside diameter, three 1 AWG and the 6 AWG EGC, with their Table 5 areas.
STEP 6 OF 10Fill 34.7%, within 40%. Jam ratio 3.09, in the jamming band. The color key, the answer, and how it was worked out.
STEP 7 OF 10The working ends at 1-1/4 in EMT, 34.7% fill. The report: name the job, save or share the PDF, or save the job.
STEP 8 OF 10Code references in plain language: Chapter 9 Tables 1, 4 and 5, Notes 4 and 7, and the derating rules.
STEP 9 OF 10The rest of the code references: 240.4(D), the rooftop adder in 310.15(B)(2), and 310.14(A)(2).
STEP 10 OF 10The PDF, page 1: the inputs and the answer, 1-1/4 in EMT, 35% full, 40% allowed.
The same 10 screens with the captions burned in. No sound.
MP4, 1.2 MB, 11 seconds.
The PDF report for the same job, all 3 pages as the app writes it.
On Android, $49.99 once. Everything on this page.
In the Suite inside its Conduit Fill screen, with the same Chapter 9 fill figures for THHN. The to-scale cross-section with the fill bar and jam check, the XHHW and TW/THW areas, tap-a-size entry and the EGC and system choices came out of the app and are being brought back across.
