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 lavatory, water closet, and bathtub draining into… | Washington Journeyman Plumber Practice Question

The isometric below shows a lavatory, water closet, and bathtub draining into a shared horizontal branch. Using UPC drainage fixture-unit values for private residential fixtures, what is the total DFU load on the branch shown?

    LAV          WC           TUB
     |            |             |
  1-1/2"         3"            2"
     |            |             |
     +------------+------+------+
                  |
             3" BRANCH TO STACK
                  |
                  v

Bathroom group horizontal branch

Take the full free Washington Journeyman Plumber practice test

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.

    LAV          WC           TUB
     |            |             |
  1-1/2"         3"            2"
     |            |             |
     +------------+------+------+
                  |
             3" BRANCH TO STACK
                  |
                  v

Bathroom group horizontal branch

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