Enter the feeder device, the tap length, where it runs and what it ends in. The app picks the 240.21(B) rule that applies, checks every condition of it, gives the smallest conductor that meets it, shows the same tap under the other rules and writes a PDF.
The app’s own example, every screen in order, 9 steps.
STEP 1 OF 9The example opens filled in: a 25 ft tap from a 400 A feeder breaker to a 200 A main breaker, the answer pinned at the foot.
STEP 2 OF 9The feeder and the tap: 400 A device, 25 ft, inside a building, in a raceway. It ends in a 200 A breaker, 160 A load.
STEP 3 OF 9The tap conductors: copper, THHN / THWN-2 at 90 C, on 75 C terminals.
STEP 4 OF 9Conductor size left on Recommend the smallest. The answer: 3/0 AWG Cu, 200 A at 75 C, every condition met.
STEP 5 OF 9The answer, and how it was worked out: each condition of the 25 ft rule OK, from 400 A / 3 = 133.3 A to the 160 A load.
STEP 6 OF 9The other rules: 25 ft is too long for the 10 ft rule, and the outside rule needs an outside tap. Then the drawing starts.
STEP 7 OF 9The drawing: 25 ft of 3/0 AWG Cu from the tap point to a 200 A breaker, each condition checked, and what people get wrong.
STEP 8 OF 9The same tap under the other rules, then the report: save or share the PDF, or save the job.
STEP 9 OF 9The PDF, page 1: the inputs and the answer, a 25 ft tap of 3/0 AWG Cu, every condition met.
The same 9 screens with the captions burned in. No sound.
MP4, 1.1 MB, 10 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.
Feeder Tap is not in the Suite. It was built for the app and runs only in Stinger Pro Tools.
