What is Trade Code Wizard?

Trade Code Wizard is an AI-powered building code assistant that gives tradespeople instant, jurisdiction-aware answers for plumbing (IPC, UPC), electrical (NEC), and HVAC work, plus built-in calculators for pipe sizing, vent sizing, conduit fill, and fixture units.

Which codes and trades does it cover?

It covers plumbing (International Plumbing Code and Uniform Plumbing Code), electrical (National Electrical Code / NFPA 70), and HVAC/mechanical code, with answers tailored for plumbers, electricians, and HVAC technicians.

Is Trade Code Wizard a subscription?

Yes. Trade Code Wizard is a subscription service with a free trial for new users. Sign up at tradecodewizard.com to get started.

What calculators are included?

Built-in calculators include pipe sizing, gas pipe sizing, pipe offset, vent sizing, conduit fill, voltage drop, and service/load calculations, alongside reference tables for wire sizing, fixture units, occupancy loads, egress, and energy code.

Can I use it in the field on my phone?

Yes. Trade Code Wizard is a web app that works on phones, tablets, and desktops, so you can look up code requirements and run calculations right on the jobsite.

Who builds Trade Code Wizard?

Trade Code Wizard is built by Pine Digital Designs, a software studio based in Tacoma, Washington.

The isometric below shows a water riser with an 8 WSFU branch at the first… | Washington Journeyman Plumber Practice Question

The isometric below shows a water riser with an 8 WSFU branch at the first floor and another 8 WSFU branch at the second floor, both fed from a single main riser below the water meter. What is the total WSFU load the main riser must be sized to carry?

     2ND FLOOR BRANCH (8 WSFU)
               |
     1ST FLOOR BRANCH (8 WSFU)
               |
          MAIN RISER
               |
           WATER METER

Two-floor water riser

The main riser in the isometric below carries a combined 16 WSFU load. Under the UPC, can a plumber determine the minimum riser pipe size…
A fixture is listed in the UPC's Table 610.3 with a total WSFU value of 4.0 (covering both hot and cold combined). Per the UPC's rule for…
A water-sizing isometric shows two branches converging at a tee before the main riser: Branch 1 carries 5 WSFU and Branch 2 carries 3…
When reading a water-sizing isometric under time pressure, what is the most common error that causes an otherwise-correct WSFU calculation…

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Trade Code Wizard is not affiliated with, endorsed by, or licensed by the International Code Council (ICC), the National Fire Protection Association (NFPA), IAPMO, the ESCO Institute, NATE, HVAC Excellence, NASCLA, NICET, the U.S. Environmental Protection Agency, PSI, Prov, Pearson VUE, or any state or local licensing board. Exam and code names are used only to identify which examination this study material prepares you for.

These are original practice questions written to publicly published exam content outlines. They are not actual exam questions, and they do not reproduce code text. Explanations cite code sections and state requirements in our own words — always verify against the code edition your jurisdiction has adopted, which may differ from the edition cited here.

Passing is not guaranteed. This is study material, not a substitute for the adopted code, for your licensing board's requirements, or for qualified instruction.

     2ND FLOOR BRANCH (8 WSFU)
               |
     1ST FLOOR BRANCH (8 WSFU)
               |
          MAIN RISER
               |
           WATER METER

Two-floor water riser

Take the full free Washington Journeyman Plumber practice test

Passing is not guaranteed. This is study material, not a substitute for the adopted code, for your licensing board's requirements, or for qualified instruction.

Washington Journeyman Plumber practice question

Washington Journeyman Plumber practice question

Washington Journeyman Plumber practice question

More Washington Journeyman Plumber practice questions

Washington Journeyman Plumber practice question

More Washington Journeyman Plumber practice questions